THPML —  MC3/6/7 Poster Session   (03-May-18   16:00—17:30)

Paper	Title	Page
THPML002	Emittance Preservation in Plasma-Based Accelerators with Ion Motion	4654
	C. Benedetti, E. Esarey, W. Leemans, T.J. Mehrling, C.B. Schroeder LBNL, Berkeley, California, USA
	Funding: This work was supported by the Director, Office of Science, Office of High Energy Physics, of the U.S. DOE under Contract No. DE-AC02-05CH11231. In a plasma-ac­cel­er­a­tor-based lin­ear col­lider, the den­sity of matched, low-emit­tance, high-en­ergy par­ti­cle bunches re­quired for col­lider ap­pli­ca­tions can be or­ders of mag­ni­tude above the back­ground ion den­sity, lead­ing to ion mo­tion, per­tur­ba­tion of the fo­cus­ing fields, and, hence, to beam emit­tance growth. By an­a­lyz­ing the re­sponse of the back­ground ions to an ul­tra­high den­sity beam, an­a­lyt­i­cal ex­pres­sions, valid for non-rel­a­tivis­tic ion mo­tion, are ob­tained for the per­turbed fo­cus­ing wake­field. Ini­tial beam dis­tri­b­u­tions are de­rived that are equi­lib­rium so­lu­tions, which re­quire head-to-tail bunch shap­ing, en­abling emit­tance preser­va­tion with ion mo­tion.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML002
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THPML006	Using Drive Rods in Inductions Cells to Reduce the Beam Break Up Instability	4658
	N. Pogue, T.L. Houck, B.R. Poole LLNL, Livermore, California, USA
	The Beam Breakup In­sta­bil­ity is a crit­i­cal ef­fect to re­duce in high cur­rent in­duc­tion ac­cel­er­a­tors. The RF modes gen­er­ated in­side the in­duc­tion cells can de­flect or de­grade sub­se­quent beam tra­vers­ing the cell. Sig­nif­i­cant ef­fort has been in­vested in min­i­miz­ing the ef­fect over sev­eral decades. One mech­a­nism that is known to re­duce the trans­verse im­ped­ance, the main ob­serv­able ex­per­i­men­tally which di­rectly re­lates to the BBU am­pli­tude, is to in­tro­duce fer­rites to ab­sorb the fields. An­other, less in­ves­ti­gated mech­a­nism, is to dis­turb the modes sym­me­try by in­sert­ing the drive rods at the proper lo­ca­tions in the cell. This paper will show that the drive rods can dra­mat­i­cally re­duce the trans­verse im­ped­ance, and will show that sim­u­la­tions are ma­tur­ing to­wards pre­dict­ing this ef­fect. Lawrence Liv­er­more Na­tional Lab­o­ra­tory is op­er­ated by Lawrence Liv­er­more Na­tional Se­cu­rity, LLC, for the U.S. De­part­ment of En­ergy, Na­tional Nu­clear Se­cu­rity Ad­min­is­tra­tion under Con­tract DE-AC52-07­NA27344.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML006
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THPML007	An Investigation of Electron Beam Divergence from a Single DFEA Emitter Tip	4662
	H.L. Andrews, B.K. Choi, R.L. Fleming, D. Kim, J.W. Lewellen, K.E. Nichols, D.Y. Shchegolkov, E.I. Simakov LANL, Los Alamos, New Mexico, USA
	Funding: We gratefully acknowledge the support of the U.S. Department of Energy through the LANL/LDRD Program for this work. Di­a­mond Field-Emit­ter Array (DFEA) cath­odes are ar­rays of mi­cron-scale di­a­mond pyra­mids with nanome­ter-scale tips. DFEAs can pro­duce high emis­sion cur­rents with small emit­tance and en­ergy spread. At LANL, we have an on­go­ing pro­gram to test DFEA cath­odes for the pur­pose of using them to gen­er­ate high-cur­rent, low-emit­tance elec­tron beams for di­elec­tric laser ac­cel­er­a­tors. We have re­cently up­graded our cath­ode test cham­ber to use a mesh anode in place of a solid lu­mi­nes­cent anode. In ad­di­tion to al­low­ing for down­stream beam trans­port, this arrange­ment may elim­i­nate ear­lier prob­lems with re­duced cath­ode per­for­mance due to ion back-bom­bard­ment. We are mea­sur­ing di­ver­gence of the elec­tron beam past the mesh in an ef­fort to char­ac­ter­ize the in­her­ent beam di­ver­gence off the di­a­mond tip and di­ver­gence con­tri­bu­tion from the mesh. We will com­pare these ob­ser­va­tions with the­o­ret­i­cal and mod­eled val­ues.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML007
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THPML009	Polarized Deuteron Negative Ion Source for Nuclear Physics Applications	4665
	V.G. Dudnikov, M.A. Cummingspresenter, R.P. Johnson Muons, Inc, Illinois, USA A.V. Sy JLab, Newport News, Virginia, USA
	The pro­posed U.S. Elec­tron-Ion Col­lider (EIC) pro­vides a unique tool to ex­plore the next fron­tier in Quan­tum Chro­mo­dy­nam­ics, the de­pen­dence of hadron struc­ture on the dy­nam­ics of glu­ons and sea quarks. Po­lar­ized beams are es­sen­tial to these stud­ies; un­der­stand­ing of the hadron struc­ture can­not be achieved with­out knowl­edge of the spin. The ex­ist­ing EIC con­cepts uti­lize both po­lar­ized elec­trons and po­lar­ized pro­tons/light ion species to probe the sea quark and gluon dis­tri­b­u­tions. Po­lar­ized deuterons pro­vide an es­pe­cially unique sys­tem for study by es­sen­tially pro­vid­ing a com­bi­na­tion of quark and nu­clear physics. We note that there are cur­rently no op­er­a­tional po­lar­ized deuteron beam sources in the United States. This po­lar­ized deuteron source can serve as a po­lar­ized deuteron in­jec­tor for a fu­ture EIC, with ad­di­tional ap­pli­ca­tions in po­larime­try and po­lar­ized gas tar­gets for ex­per­i­ments at CEBAF or RHIC and would be very use­ful for our fu­ture fa­cil­i­ties.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML009
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THPML010	Modeling of Diamond Field Emitter Arrays for Shaped Electron Beam Production	4668
	K.E. Nichols, H.L. Andrews, D.Y. Shchegolkov, E.I. Simakov LANL, Los Alamos, New Mexico, USA
	We pre­sent sim­u­la­tions of shaped elec­tron beam pro­duc­tion from di­a­mond field emit­ter array (DFEA) cath­odes. DFEAs are ar­rays of di­a­mond pyra­mids with bases of the order of 10 mi­crons that pro­duce high cur­rent den­si­ties. These ar­rays can be fab­ri­cated in ar­bi­trary shapes such as a tri­an­gle or a dou­ble tri­an­gle, so that they pro­duce an in­her­ently shaped beam. These trans­versely shaped beams can be put through an emit­tance ex­changer to pro­duce a lon­gi­tu­di­nally shaped elec­tron beam dis­tri­b­u­tion for use with high-trans­former ratio wake­field ac­cel­er­a­tors. Sim­u­la­tions are con­ducted with MICHELLE. We de­sign cath­odes and fo­cus­ing sys­tems that pre­serve the beam's shape while trans­port­ing it to the emit­tance ex­changer.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML010
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THPML011	Possibilities for Fabricating Polymer Dielectric Laser Accelerator Structures with Additive Manufacturing	4671
	E.I. Simakov, R.D. Gilbertson, M.J. Herman, G. Pilania, D.Y. Shchegolkov, E.M. Walker, E. Weis LANL, Los Alamos, New Mexico, USA R.J. England, K.P. Wootton SLAC, Menlo Park, California, USA
	Funding: Los Alamos National Laboratory LDRD Program We pre­sent re­sults of re­cent stud­ies of new ma­te­ri­als de­signed for the ad­di­tive man­u­fac­tur­ing of ac­cel­er­at­ing struc­tures for di­elec­tric laser ac­cel­er­a­tors (DLAs). Demon­stra­tion of a stand-alone prac­ti­cal DLA re­quires in­no­va­tion in de­sign and fab­ri­ca­tion of ef­fi­cient laser ac­cel­er­a­tor struc­tures and cou­plers. Many com­pli­cated three-di­men­sional struc­tures for laser ac­cel­er­a­tion (such as a long wood­pile struc­ture with cou­plers) are dif­fi­cult to man­u­fac­ture with con­ven­tional mi­cro­fab­ri­ca­tion tech­nolo­gies. LANL has a large ef­fort fo­cused on de­vel­op­ing new ma­te­ri­als and tech­niques for ad­di­tive man­u­fac­tur­ing. The ma­te­ri­als for DLA struc­tures must have high di­elec­tric con­stant (larger than 4), low loss in the in­frared regime, high laser dam­age thresh­old, and be able to with­stand the elec­tron beam dam­age. This pre­sen­ta­tion will dis­cuss the de­vel­op­ment of novel in­frared di­elec­tric ma­te­ri­als that are of in­ter­est for laser ac­cel­er­a­tion and are com­pat­i­ble with ad­di­tive man­u­fac­tur­ing, as well as re­cent ad­vances in ad­di­tive man­u­fac­tur­ing of di­elec­tric wood­pile struc­tures using a Nano­scribe di­rect laser-writ­ing 3D printer.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML011
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THPML012	Simulations and Measurements of the Wakefield Loading Effect in Argonne Wakefield Accelerator Beamline	4675
	J. Upadhyay, E.I. Simakov LANL, Los Alamos, New Mexico, USA M.E. Conde, Q. Gao, N.R. Neveu, J.G. Power, J.H. Shao, E.E. Wisniewski ANL, Argonne, Illinois, USA N.R. Neveu IIT, Chicago, Illinois, USA
	A beam dri­ven ac­cel­er­a­tion ex­per­i­ment in a pho­tonic band gap (PBG) struc­ture is planned at Ar­gonne wake­fied ac­cel­er­a­tor (AWA) fa­cil­ity at Ar­gonne Na­tional Lab­o­ra­tory. We plan to pass a high charge (drive) beam through a trav­el­ling wave 11.7 GHz PBG struc­ture and gen­er­ate a wake­field. This wake­field will be probed by a low charge (wit­ness) beam to demon­strate wake­field ac­cel­er­a­tion and de­cel­er­a­tion. The drive and wit­ness bunches will be ac­cel­er­ated to above 60 MeV in the main ac­cel­er­a­tor at AWA which has fre­quency of 1.3 GHz. The charges used in this ex­per­i­ment could be as high as 20 nC. To mea­sure the ex­clu­sive ef­fect of PBG the struc­ture on ac­cel­er­a­tion and de­cel­er­a­tion of the wit­ness bunch we have to ex­clude the ef­fect of beam load­ing of the main AWA ac­cel­er­a­tor struc­ture. To un­der­stand the wake­field ef­fect in AWA, we con­ducted an ex­per­i­ment where we passed the high charge (10 nC) beam through the ac­cel­er­a­tor struc­ture which was fol­lowed by a 2 nC wit­ness beam sep­a­rated by 4 wave­length. The en­ergy of wit­ness beam was mea­sured in the pres­ence and ab­sence of the drive beam. The beam load­ing was ob­served and quan­ti­fied. The re­sults of this work will be pre­sented in the con­fer­ence.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML012
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THPML013	Demonstration of the Wakefield Acceleration in an 11.7 GHz Photonic Band Gap Accelerator Structure	4678
	J. Upadhyay, E.I. Simakov LANL, Los Alamos, New Mexico, USA M.E. Conde, Q. Gao, N.R. Neveu, J.G. Power, J.H. Shao, E.E. Wisniewski ANL, Argonne, Illinois, USA
	We plan to con­duct a beam dri­ven ac­cel­er­a­tion ex­per­i­ment in a pho­tonic band gap (PBG) ac­cel­er­a­tor struc­ture op­er­at­ing at 11.7 GHz at Ar­gonne Wake­field Ac­cel­er­a­tor (AWA) fa­cil­ity. For the ex­per­i­ment, the PBG struc­ture will be ex­cited by a high charge (up to 10 nC) elec­tron bunch, and a sec­ond smaller charge wit­ness bunch will be ac­cel­er­ated. Be­cause the PBG struc­ture was fab­ri­cated with elec­tro­form­ing, the AWA beam­line in­cludes a Be win­dow placed be­fore the PBG struc­ture that pro­tects the cath­ode from con­t­a­m­i­na­tion due to pos­si­ble out­gassing from the elec­tro­formed cop­per. The di­am­e­ter of the Be win­dow is 9 mm and the beam tube di­am­e­ter of the PBG struc­ture is 6.4 mm. The size of the high charge elec­tron beam on Be win­dow has to be min­i­mized to min­i­mize scat­ter­ing. The pa­ra­me­ters of the beam­line had to be ad­justed to achieve good prop­a­ga­tion of the beam. An OPAL sim­u­la­tion for the AWA beam­line was per­formed for 1, 5, and 10 nC beams. The beam size was ex­per­i­men­tally mea­sured at dif­fer­ent po­si­tions in the beam­line for dif­fer­ent charges to ver­ify sim­u­la­tions. Fi­nally, the high charge elec­tron beam was passed through the PBG struc­ture and ac­cel­er­a­tion of the wit­ness bunch was mea­sured
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML013
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THPML014	A Metamaterial Wagon Wheel Structure for Wakefield Acceleration by Reversed Cherenkov Radiation	4681
SUSPF036	use link to see paper's listing under its alternate paper code
	X.Y. Lu, I. Mastovsky, M.A. Shapiro, R.J. Temkin MIT/PSFC, Cambridge, Massachusetts, USA M.E. Conde, C.-J. Jing, J.G. Power, J.H. Shao, E.E. Wisniewski ANL, Argonne, Illinois, USA
	Funding: U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0015566 and the U.S. Department of Energy Office of Science under Contract No. DE-AC02-06CH11357 We pre­sent the de­sign and ex­per­i­men­tal op­er­a­tion on an X-band meta­ma­te­r­ial (MTM) wagon wheel struc­ture for wake­field ac­cel­er­a­tion. The struc­ture was de­signed and fab­ri­cated at MIT, and tested at the Ar­gonne Wake­field Ac­cel­er­a­tor (AWA) lab­o­ra­tory at Ar­gonne Na­tional Lab. The MTM wagon wheel struc­ture is an all-metal pe­ri­odic struc­ture at 11.4 GHz. The fun­da­men­tal TM mode has a neg­a­tive group ve­loc­ity, so when an elec­tron beam trav­els through, en­ergy is ex­tracted from the beam by re­versed Cherenkov ra­di­a­tion, which was ver­i­fied in the ex­per­i­ment. Sin­gle bunches up to 45 nC were sent through the struc­ture with a beam aper­ture of 6 mm and gen­er­ated mi­crowave power up to 25 MW in a 2 ns pulse, in agree­ment with both the an­a­lyt­i­cal wake­field the­ory and the nu­mer­i­cal CST sim­u­la­tions. Two bunches with a total charge of 85 nC gen­er­ated 80 MW of mi­crowave power. The struc­ture is scal­able to a power ex­trac­tor of over 1 GW by in­creas­ing the struc­ture length from 8 cm to 22 cm.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML014
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THPML015	Dielectric Multipactor Discharges at 110 GHz	4684
	S. C. Schaub MIT, Cambridge, Massachusetts, USA M.A. Shapiro, R.J. Temkin MIT/PSFC, Cambridge, Massachusetts, USA
	A 1.5 MW, 110 GHz gy­ro­tron has been used to ex­per­i­men­tally mea­sure the max­i­mum sus­tain­able fields on di­elec­tric ma­te­ri­als in vac­uum. The pur­pose of this work is to eval­u­ate the suit­abil­ity of these ma­te­ri­als for fu­ture ap­pli­ca­tions in high fre­quency lin­ear ac­cel­er­a­tors and high power ter­a­hertz com­po­nents. To our knowl­edge, these are the first mea­sure­ments of mul­ti­pactor phe­nom­ena in the mil­lime­ter wave or ter­a­hertz fre­quency range. Ma­te­ri­als tested in­clude alu­mina, sap­phire, fused quartz, crys­tal quartz, and high re­sis­tiv­ity sil­i­con. Di­elec­tric sam­ples were tested both as win­dows, with elec­tric fields par­al­lel to the sur­face, and sub-wave­length di­elec­tric rod wave­guides, with elec­tric fields per­pen­dic­u­lar to the sur­face. Sur­face elec­tric fields in ex­cess of 52 MV/m were achieved in 3 mi­crosec­ond pulses. Vis­i­ble light emis­sion, ab­sorbed/scat­tered mi­crowave power, and emit­ted elec­trons were mea­sured to char­ac­ter­ize the dis­charges on the di­elec­tric sur­faces. The re­sults of these ex­per­i­ments have been com­pared to the­o­ret­i­cal cal­cu­la­tions of mul­ti­pactor dis­charges, test­ing these the­o­ries at sig­nif­i­cantly higher fre­quen­cies than has been done be­fore.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML015
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THPML017	Beam Dynamics Calculation of a New Injection System for LINAC II	4687
	J.X. Zhang, M. Hüning DESY, Hamburg, Germany
	The Linac II at DESY (Deutsches Elek­tro­nen Syn­chro­tron) is an elec­tron/positron lin­ear ac­cel­er­a­tor with a 400 MeV pri­mary elec­tron linac, an 800 MW positron con­verter, and a 450 MeV sec­ondary elec­tron/positron linac. For re­li­a­bil­ity two in­jec­tion sys­tems can be switched, a 150 kV bom­barder diode gun dat­ing from 1969 and a 100 kV tri­ode gun com­mis­sioned in 2014. The older bom­barder gun shall be re­placed with a tri­ode gun op­ti­mized for in­jec­tion into the syn­chro­tron ra­di­a­tion fa­cil­ity PETRA III. In this paper, the pa­ra­me­ters of the ex­ist­ing in­jec­tors and the de­sign con­sid­er­a­tions for the new in­jec­tor are pre­sented. The pre­lim­i­nary beam dy­nam­ics cal­cu­la­tion of the new in­jec­tion sys­tem will be per­formed; the fu­ture plan of the re­place­ment will be dis­cussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML017
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THPML018	Modeling of Self-Modulated Laser Wakefield Acceleration Driven by Sub-Terawatt Laser Pulses	4690
SUSPF035	use link to see paper's listing under its alternate paper code
	C.-Y. Hsieh, S.-H. Chen NCU, Chung Li, Taiwan M.W. Lin National Tsing-Hua University (NTHU), Hsinchu, Taiwan
	Funding: This work has been supported by the Ministry of Science and Technology in Taiwan by grant MOST104-2112-M-008-013-MY3 and by grant MOST105-2112-M-007-036-MY3. Laser wake­field ac­cel­er­a­tor (LWFA) can be achieved in a scheme in which a sub-ter­awatt (TW) laser pulse is in­tro­duced into a thin, high-den­sity tar­get*. As a re­sult, the self-fo­cus­ing and the self-mod­u­la­tion can greatly en­hance the peak in­ten­sity of the laser pulse ca­pa­ble of ex­cit­ing a non­lin­ear plasma wave to ac­cel­er­ate elec­trons. A par­ti­cle-in-cell model was de­vel­oped to study the sub-TW LWFA, in which a 0.6-TW laser pulse is in­jected into a hy­dro­gen gas cell with a flat-top den­sity pro­file. In ad­di­tion to using 800-nm laser pulses, laser pulses of 1030 nm were used in sim­u­la­tions as they rep­re­sent a vi­able ap­proach to re­al­ize the sub-TW LWFA dri­ven by high-fre­quency, diode-pumped laser sys­tems**. Process of the elec­tron in­jec­tion is com­pli­cated in such a high-den­sity plasma; how­ever, the sim­u­la­tion re­sults show that the ap­pro­pri­ate in­jec­tion and ac­cel­er­a­tion of elec­trons can be achieved by op­ti­miz­ing the length of the gas cell. When a 340-mi­crom­e­ter long gas cell is in­tro­duced, en­er­getic elec­trons (> 1 MeV) are pro­duced with a rel­a­tively low emit­tance of 3.5 pi-mm-mrad and a total charge of 0.32 nC ac­cord­ingly. * A. J. Goers et al., Phys. Rev. Lett. 115, 194802 (2015). ** E. Kaksis et al., Opt. Express 24, 25, 28915 (2016).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML018
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THPML020	The First Results of Trial Operation and Performance Improve of the 100 MeV/ 100 kW Electron Linear Accelerator of the NSC KIPT SCA Neutron Source	4693
	A.Y. Zelinsky, O.E. Andreev, V.P. Androsov, O. Bezditko, O.V. Bykhun, A.N. Gordienko, V.A. Grevtsev, A. Gvozd, V.E. Ivashchenko, I.I. Karnaukhov, I.M. Karnaukhov, V.P. Lyashchenko, M. Moisieienko, A.V. Reuzayev, D.V. Tarasov, V.I. Trotsenko NSC/KIPT, Kharkov, Ukraine Y.L. Chi IHEP, Beijing, People's Republic of China
	The NSC KIPT SCA Neu­tron Source uses 100 MeV/ 100 kW elec­tron lin­ear ac­cel­er­a­tor as a dri­ver for the gen­er­a­tion of the ini­tial neu­trons. The trial op­er­a­tion of the ac­cel­er­a­tor was started in 2018. To pro­vide de­sign elec­tron beam pa­ra­me­ters is the pri­mary task of the first stage of the trial op­er­a­tion. Dur­ing the first stage of the ac­cel­er­a­tor op­er­a­tion the fol­low­ing tasks were under con­sid­er­a­tion: min­i­miza­tion of the elec­tron beam losses along ac­cel­er­a­tor, pro­vid­ing of the sta­ble elec­tron beam pulse cur­rent, ad­just­ment of the elec­tron beam po­si­tion along ac­cel­er­a­tor and pro­vid­ing of the uni­form elec­tron beam dis­tri­b­u­tion at the tung­sten neu­tron gen­er­at­ing tar­get. The main re­sults of the ac­cel­er­a­tor op­er­a­tion and meth­ods of per­for­mance im­prove are de­scribed in the paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML020
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THPML021	Individual Acceptance Testing and Comprehensive Testing of NSC KIPT SCA Neutron Source Technological Systems and Equipment	4696
	A.Y. Zelinsky, O.V. Bykhun, I.M. Karnaukhov, A. Mytsykov, I. Ushakov NSC/KIPT, Kharkov, Ukraine I. Bolshinsky INL, Idaho Falls, Idaho, USA Y. Gohar ANL, Argonne, Illinois, USA
	Dur­ing 2016-2017 the in­stal­la­tion, as­sem­bling and com­mis­sion­ing of the NSC KIPT SCA Neu­tron Source tech­no­log­i­cal sys­tems were com­pleted. The fa­cil­ity was de­signed and de­vel­oped by NSC KIPT of Ukraine in col­lab­o­ra­tion with ANL of USA. The con­struc­tion of the neu­tron source fa­cil­ity was started in 2012. The neu­trons of the sub­crit­i­cal as­sem­bly are gen­er­ated by 100 MeV/ 100 kW elec­tron beam uni­formly dis­trib­uted at the sur­face of the tung­sten tar­get. It is sup­posed that the fa­cil­ity will be used to per­form basic and ap­plied nu­clear re­search, pro­duce med­ical iso­topes, and train nu­clear spe­cial­ists. The in­di­vid­ual ac­cep­tance test­ing and com­pre­hen­sive test­ing were con­ducted for the tech­no­log­i­cal and en­gi­neer­ing sys­tems of the neu­tron source. The tests were per­formed in com­pli­ance with pro­grams and method­olo­gies agreed by the State Nu­clear Reg­u­la­tory In­spec­torate of Ukraine. The test­ing re­sults con­firmed com­pli­ance of the equip­ment with tech­ni­cal spec­i­fi­ca­tions, stan­dards, reg­u­la­tions and rules on nu­clear and ra­di­a­tion safety and pre­pared­ness of these sys­tems for trial op­er­a­tion with the KIPT neu­tron source. The trial op­er­a­tion of the NSC KIPT SCA 'Neu­tron Source' has been started.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML021
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THPML022	Application of Surface Plasmon Polaritons on Charged particle Beam Diagnostics	4699
	Z.G. Jiang, D. Gupresenter, Q. Gu, M.H. Zhao SINAP, Shanghai, People's Republic of China
	In Re­cent years, the Cherenkov light ra­di­a­tion trans­formed from sur­face plas­mon po­lari­tons has been found and pro­posed for a com­pact and ad­justable light source. As the process is mo­ti­vated by charged par­ti­cle beam, the char­ac­ter­is­tics of the light are not only re­lated with the de­vice but can also re­flect cer­tain char­ac­ter­is­tics of the beam. In this paper, a beam po­si­tion and en­ergy mea­sure­ment method has been pro­posed based on the Cherenkov light ra­di­a­tion trans­formed from sur­face plas­mon po­lari­tons. Early-stage nu­mer­i­cal and an­a­lyt­i­cal in­ves­ti­ga­tions are also pre­sented for a pla­nar struc­ture de­vice.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML022
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THPML024	Monoenergetic Beam Generated by Laser Accelerator at Peking University	4702
	K. Zhu, J.E. Chen, Y.X. Geng, C. Li, D.Y. Li, Q. Liao, C. Lin, H.Y. Lu, W.J. Ma, Y.R. Shou, Wu,M.J. Wu, X.H. Xu, X.Q. Yan, J.Q. Yu, Y.Y. Zhao, J.G. Zhu PKU, Beijing, People's Republic of China
	An ul­tra­high-in­ten­sity laser in­ci­dent on a tar­get sets up a very strong elec­tro­sta­tic field ex­ceed­ing 100 GV/m, it will few or­ders mag­ni­tude shrink down the tra­di­tional radio fre­quency ac­cel­er­a­tors. Whereas, to build a real ac­cel­er­a­tor for rou­tine op­er­a­tion, many sci­en­tific and tech­ni­cal chal­lenges for laser ac­cel­er­a­tion need to over­come be­fore they could be ap­plied to these ap­pli­ca­tions. Re­cently A laser ac­cel­er­a­tor− Com­pact Laser Plasma Ac­cel­er­a­tor (CLAPA) is being built with a beam line to de­liver pro­ton beam with the en­ergy of 1~15MeV, en­ergy spread of ¡À1% and 107-8 pro­tons per pulse. The very high cur­rent pro­ton beam is ac­cel­er­ated in laser ul­tra­thin-foil in­ter­ac­tion and trans­ported by a beam line con­sist­ing of the elec­tric quadru­ple and an­a­lyz­ing mag­nets. It makes sure the good beam qual­i­ties such as en­ergy spread, charge, re­peata­bil­ity and avail­abil­ity of dif­fer­ent en­ergy, which means that for the first laser ac­cel­er­a­tion be­comes a real laser ac­cel­er­a­tor. With the de­vel­op­ment of high-rep rate PW laser tech­nol­ogy, we can now en­vi­sion a com­pact beam ther­a­peu­tic ma­chine of can­cer treat­ment in the near fu­ture soon.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML024
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THPML025	Operation of an RF Modulated Thermionic Electron Source at TRIUMF	4705
	F. Ames, K. Fong, B. Humphries, S.R. Koscielniak, A. Laxdal, Y. Ma, T. Planche, S. Saminathan, E. Thoeng TRIUMF, Vancouver, Canada
	ARIEL (Ad­vanced Rare Iso­topE Lab­o­ra­tory) at TRI­UMF will use a high-power elec­tron beam to pro­duce ra­dioac­tive ion beams via photo-fis­sion. The sys­tem has been de­signed to pro­vide up to 10 mA of elec­trons at 30 MeV. The elec­tron source de­liv­ers elec­tron bunches with charge up to 16 pC at a rep­e­ti­tion fre­quency of 650 MHz at 300 keV. The main com­po­nents of the source are a grid­ded dis­penser cath­ode (CPI - Y845) in an SF6 filled ves­sel and an in-air HV power sup­ply. The beam is bunched by ap­ply­ing DC and RF fields to the grid. A macro pulse struc­ture can be ap­plied by ad­di­tional low fre­quency mod­u­la­tion of the RF sig­nal. This al­lows ad­just­ing the av­er­age beam cur­rent by chang­ing the duty fac­tor of the macro puls­ing. Unique fea­tures of the gun are its cath­ode/anode geom­e­try to re­duce field emis­sion, and trans­mis­sion of RF mod­u­la­tion via a di­elec­tric (ce­ramic) wave­guide through the SF6. The source has been in­stalled and fully com­mis­sioned to a beam power up to 1 KW and tests with ac­cel­er­ated beams have been per­formed. Mea­sure­ments of the beam prop­er­ties and re­sults from the com­mis­sion­ing and op­er­a­tional ex­pe­ri­ences of the source will be pre­sented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML025
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THPML027	Longitudinal and Transverse Wakefields Simulations and Studies in Dielectric-Coated Circular Waveguides	4708
	L. Ficcadenti Rome University La Sapienza, Roma, Italy A. Biagioni INFN/LNF, Frascati (Roma), Italy G. Castorina, D. Francescone, M. Marongiupresenter, M. Migliorati, A. Mostacci, L. Palumbo Sapienza University of Rome, Rome, Italy
	In re­cent years, there has been a grow­ing in­ter­est and rapid ex­per­i­men­tal progress on the use of e.m. fields pro­duced by elec­tron beams pass­ing through di­elec­tric-lined struc­tures and on the ef­fects they might have on the drive and wit­ness bunches. Short ul­tra-rel­a­tivis­tic elec­tron bunches can ex­cite very in­tense wake­fields, which pro­vide an ef­fi­cient ac­cel­er­a­tion through the di­elec­tric wake­field ac­cel­er­a­tors (DWA) scheme with higher gra­di­ent than that in the con­ven­tional RF LINAC. These beams can also gen­er­ate high power nar­row band THz co­her­ent Cherenkov ra­di­a­tion. These high gra­di­ent fields may cre­ate strong in­sta­bil­i­ties on the beam it­self caus­ing is­sues in plasma ac­cel­er­a­tion ex­per­i­ments (PWFA), plasma lens­ing ex­per­i­ments and in re­cent beam di­ag­nos­tic ap­pli­ca­tions. In this work we re­port the re­sults of the sim­u­la­tions and stud­ies of the wake­fields gen­er­ated by elec­tron beams at dif­fer­ent lengths and charges pass­ing on and off axis in di­elec­tric-coated cir­cu­lar wave­guides. We also pro­pose a semi-an­a­lyt­i­cal method to cal­cu­late these high gra­di­ent fields with­out re­sort­ing to time con­sum­ing sim­u­la­tions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML027
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THPML028	Genetic Algorithms for Machine Optimization in the Fair Control System Environment	4712
	W. Geithner, Z. Andelkovic, S. Appel, O. Geithnerpresenter, F. Herfurth, S. Reimann, G. Vorobjev GSI, Darmstadt, Germany F. Wilhelmstötter emarsys, Vienna, Austria
	Due to the mas­sive par­al­lel op­er­a­tion modes at the GSI ac­cel­er­a­tors, a lot of ac­cel­er­a­tor setup and re-ad­just­ment have to be made by the op­er­a­tors dur­ing a beam time. With the FAIR pro­ject the com­plex­ity of the ac­cel­er­a­tor fa­cil­ity in­creases fur­ther­more and for ef­fi­ciency rea­sons it is rec­om­mended to es­tab­lish a high level of au­toma­tion for fu­ture op­er­a­tion. The PEP (pa­ra­me­ter evo­lu­tion pro­ject) has been launched at GSI op­er­a­tions group in 2017 to in­ves­ti­gate the po­ten­tial of a set­tings op­ti­miza­tion using evo­lu­tion­ary Al­go­rithms. The work­ing proof of prin­ci­ple has al­ready been tested at the Cryring in­jec­tor. The lat­est im­prove­ments and the fur­ther De­vel­op­ment of the Pa­ra­me­ter Evo­lu­tion Pro­ject will be shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML028
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THPML031	Collective Acceleration of Laser Plasma in Non-stationary and Non-uniform Magnetic Field	4716
	A.A. Isaev, C.I. Kozlovskij, E.D. Vovchenko MEPhI, Moscow, Russia
	This paper pre­sents the new ex­per­i­men­tal re­sults con­cern­ing ac­cel­er­a­tion of deu­terium ions ex­tracted from laser plasma in the rapid-grow­ing nonuni­form mag­netic field in order to ini­ti­ate the nu­clear re­ac­tions D(d, n)3He and Т (d,n)4He. In order to ob­tain plasma a laser that gen­er­ates in Q-switched mode the pulses of in­frared ra­di­a­tion (λ = 1.06 μm) with the en­ergy W ≤ 0.85 J and du­ra­tion of ≈10 ns. In the pre­sent study, the ve­loc­ity of a bunch of a laser plasma at a mag­netic field in­duc­tion rate of 3-108 T/s was ex­per­i­men­tally mea­sured, and an­gu­lar dis­tri­b­u­tions of ac­cel­er­ated par­ti­cle fluxes were mea­sured in the range from 0 to 30 de­grees. The max­i­mum and mean ion ve­loc­i­ties were de­ter­mined by the time-of-flight tech­nique. The pro­posed sys­tem al­lows the gen­er­a­tion of neu­trons, in­clud­ing pos­si­bly ther­monu­clear ones, on coun­ter­flows using two sim­i­lar mag­netic ac­cel­er­a­tors lo­cated coax­i­ally, fac­ing each other. In this case the prob­lem re­lated to degra­da­tion of solid neu­tron-gen­er­at­ing tar­gets is re­solved. There also oc­curs a pos­si­bil­ity of fast ac­cu­mu­lated run­ning time of packed solid tar­gets at using of deuteron-tri­tium laser tar­gets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML031
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THPML032	Using Deep Reinforcement Learning for Designing Sub-Relativistic Electron Linac	4720
SUSPF038	use link to see paper's listing under its alternate paper code
	Shin, S.W. Shin, J.-S. Chai, M. Ghergherehchi SKKU, Suwon, Republic of Korea
	Gen­er­ally, when de­sign­ing an ac­cel­er­a­tor de­vice, the de­sign is based on the ex­pe­ri­ence and knowl­edge of the de­signer. Most of the de­sign process pro­ceeds by chang-ing the pa­ra­me­ters and look­ing at the trends and then de­ter­min­ing the op­ti­mal val­ues. This process is time-con­sum­ing and te­dious. In order to ef­fi­ciently per­form this te­dious de­sign process, a method using an op­ti­miza­tion al­go­rithm is used. Re­cently, many peo­ple started to get in­ter­ested in the al­go­rithm used in Al­phaGo, which be­came fa­mous when it won the pro­fes­sional Go player de­vel­oped by google The al­go­rithm used in Al­phaGo is an al­go­rithm called re­in­force­ment learn­ing that learns how to get op­ti­mal re­ward in var­i­ous states by mov­ing around a so­lu­tion space that the agent has not told be­fore­hand. In this paper, we will dis­cuss about de­sign­ing an par­ti­cle ac­cel­er­a­tor by ap­ply­ing Deep Q-net­work al­go­rithm which is one kind of deep learn­ing re­in­force­ment learn­ing.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML032
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THPML033	Towards a Free Electron Laser Using Laser Plasma Acceleration	4723
	A. Loulergue, T. André, I.A. Andriyash, C. Benabderrahmane, P. Berteaud, F. Blache, C. Bourassin-Bouchet, F. Bouvet, F. Briquez, L. Chapuis, M.-E. Couprie, D. Dennetière, Y. Dietrich, J.P. Duval, M. El Ajjouri, T.K. El Ajjouri, A. Ghaith, C. Herbeaux, N. Hubert, M. Khojoyan, C.A. Kitegi, M. Labat, N. Leclercq, A. Lestrade, O. Marcouillé, F. Marteau, P. N'gotta, D. Oumbarek, F. Polack, P. Rommeluère, M. Sebdaoui, K.T. Tavakoli, M. Valléau, J. Vétéran, C. de Oliveira SOLEIL, Gif-sur-Yvette, France S. Bielawski, C. Evain, E. Roussel, C. Szwaj PhLAM/CERLA, Villeneuve d'Ascq, France S. Corde, J. Gautier, J.-P. Goddet, G. Lambert, B. Mahieu, V. Malka, J.P. Rousseau, S. Sebban, K. Ta Phuoc, A. Tafzi, C. Thaury LOA, Palaiseau, France O. S. Kononenko DESY, Hamburg, Germany S. Smartzev Weizmann Institute of Science, Physics, Rehovot, Israel
	Since the laser in­ven­tion, the ad­vent of X-ray Free Elec­tron Lasers (FEL) half a cen­tury later, opens new areas for mat­ter in­ves­ti­ga­tion. In par­al­lel, the spec­tac­u­lar de­vel­op­ment of laser plasma ac­cel­er­a­tion (LPA) with sev­eral GeV beam ac­cel­er­a­tion in an ex­tremely short dis­tance ap­pears very promis­ing. As a first step, the qual­i­fi­ca­tion of the LPA with a FEL ap­pli­ca­tion sets a first chal­lenge. Still, en­ergy spread and beam di­ver­gence do not meet the state-of-the-art per­for­mance of the con­ven­tional ac­cel­er­a­tors and have to be ma­nip­u­lated to ful­fill the FEL re­quire­ment. We re­port here on the un­du­la­tor spon­ta­neous emis­sion mea­sured after a trans­port ma­nip­u­la­tion elec­tron beam line, using vari­able per­ma­nent mag­net quadrupoles of vari­able strength for emit­tance hand­ing and a demix­ing chi­cane equipped with a slit for the en­ergy spread. Strate­gies of con­trol elec­tron beam po­si­tion and dis­per­sion have been elab­o­rated. The mea­sured un­du­la­tor ra­di­a­tion pro­vides an in­sight on the elec­tron beam prop­er­ties.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML033
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THPML034	Baseline Lattice for the Upgrade of SOLEIL	4726
	A. Loulergue, P. Alexandre, P. Brunelle, O. Marcouillé, A. Nadji, L.S. Nadolski, R. Nagaoka, K.T. Tavakoli, M.-A. Tordeux, A. Vivoli SOLEIL, Gif-sur-Yvette, France L. Hoummi Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Pre­vi­ous MBA stud­ies con­verged to a lat­tice com­posed of 7BA-6BA with a nat­ural emit­tance value of 200- 250 pm.​rad range. Due to the dif­fi­cul­ties of non-lin­ear op­ti­miza­tion in tar­get­ing lower emit­tance val­ues, a de­ci­sion was made to sym­metrize to­tally the ring with 20 iden­ti­cal cells hav­ing long free straight sec­tions longer than 4 m. A 7BA so­lu­tion elab­o­rated by adopt­ing the sex­tu­pole par­ing scheme with dis­per­sion bumps orig­i­nally de­vel­oped at the ESRF-EBS, in­clud­ing re­verse-bends, en­abling an emit­tance of 72 pm.​rad has been de­fined as the base­line lat­tice. The suf­fi­cient on-mo­men­tum dy­namic aper­ture ob­tained al­lows to con­sider off-axis in­jec­tion. The lin­ear and non­lin­ear dy­namic prop­er­ties of the lat­tice along with the ex­pected per­for­mance in terms of bril­liance and trans­verse co­her­ence are pre­sented. In par­tic­u­lar, the beta func­tions tuned down to 1 m in both trans­verse planes at the cen­ter of straight sec­tions allow match­ing dif­frac­tion lim­ited pho­tons up to 3 keV.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML034
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THPML041	FEBIAD Ion Source Development at TRIUMF-ISAC	4730
	B.E. Schultz, F. Ames, O.K. Kester, P. Kunz, A. Mjøs, J.F. Sandor TRIUMF, Vancouver, Canada
	The ISOL fa­cil­ity TRI­UMF-ISAC uti­lizes a num­ber of dif­fer­ent ion sources to pro­duce ra­dioac­tive ion beams. Most iso­topes are ion­ized using sur­face or res­o­nant laser ion­iza­tion, but these tech­niques are pro­hib­i­tively in­ef­fi­cient for species with high ion­iza­tion en­er­gies, such as noble gases and mol­e­cules. For these cases, the Forced Elec­tron Beam In­duced Arc Dis­charge (FEBIAD) ion source can be used. The FEBIAD uses a hot cath­ode to pro­duce elec­trons, which are ac­cel­er­ated through a po­ten­tial (< 200 V) into the anode vol­ume. Iso­topes en­ter­ing the re­sult­ing plasma un­dergo im­pact ion­iza­tion and are ex­tracted. Ef­forts are under way to bet­ter un­der­stand the physics and op­er­a­tion of the FEBIAD, using both the­ory and ex­per­i­ment. Re­cent mea­sure­ments and sim­u­la­tions on the ISAC FEBIAD will be re­ported here.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML041
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THPML042	Integrating the Lorentz Force Law for Highly-Relativistic Particle-in-Cell Simulations	4734
	A.V. Higuera, J.R. Cary Tech-X, Boulder, Colorado, USA J.R. Cary CIPS, Boulder, Colorado, USA
	Funding: This work is supported by the DOE under Grants No. DE-SC0011617 and DE-SC0012444, and by DOE/NSF Grant No. DE-SC0012584 In­te­grat­ing the Rel­a­tivis­tic Lorentz Force Law for plasma sim­u­la­tions is an area of cur­rent re­search (*, **, ***). In par­tic­u­lar, re­cent re­search in­di­cates that in­ter­ac­tion with highly-rel­a­tivis­tic laser fields is par­tic­u­larly prob­lem­atic for cur­rent in­te­gra­tion tech­niques (****). Here is pre­sented a spe­cial-pur­pose in­te­gra­tor yield­ing im­proved ac­cu­racy for highly-rel­a­tivis­tic laser-par­ti­cle in­ter­ac­tions. This in­te­gra­tor has been im­ple­mented in the par­ti­cle-in-cell code VSim, and the au­thors pre­sent an ac­cu­racy and per­for­mance com­par­i­son with sev­eral par­ti­cle push meth­ods. * http://aip.scitation.org/doi/abs/10.1063/1.4979989 ** https://arxiv.org/abs/1702.04486 *** https://arxiv.org/abs/1710.09164 **** http://aip.scitation.org/doi/abs/10.1063/1.4905523
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THPML043	Optimization of Dielectric Laser-Driven Accelerators	4737
	C.P. Welsch, M.G. Ibison, Y. Wei The University of Liverpool, Liverpool, United Kingdom M.G. Ibison, Y. Wei, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom J.D.A. Smith TXUK, Warrington, United Kingdom G.X. Xia UMAN, Manchester, United Kingdom
	Funding: This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289191. Di­elec­tric laser-dri­ven ac­cel­er­a­tors (DLAs) uti­liz­ing large elec­tric field from com­mer­cial laser sys­tem to ac­cel­er­ate par­ti­cles with high gra­di­ents in the range of GV/m have the po­ten­tial to re­al­ize a first par­ti­cle ac­cel­er­a­tor ‘on a chip'. Dual-grat­ing struc­tures are one of the can­di­dates for DLAs. They can be mass-pro­duced using avail­able nanofab­ri­ca­tion tech­niques due to their sim­pler struc­tural geom­e­try com­pared to other types of DLAs. Apart from the re­sults from op­ti­miza­tion stud­ies that in­di­cate the best struc­tures, this con­tri­bu­tion also in­tro­duces two new schemes that can help fur­ther im­prove the ac­cel­er­at­ing ef­fi­ciency in dual-grat­ing struc­tures. One is to in­tro­duce a Bragg re­flec­tor that can boost the ac­cel­er­at­ing field in the chan­nel, the other ap­plies pulse-front-tilt op­er­a­tion for a laser beam to help ex­tend the in­ter­ac­tion length.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML043
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THPML044	Operation of a Cryogenic Current Comparator with Nanoampere Resolution for Continuous Beam Intensity Measurements in the Antiproton Decelerator at CERN	4741
	M.F. Fernandes, D. Alves, T. Koettig, A. Lees, J. Tan CERN, Geneva, Switzerland M.F. Fernandes, C.P. Welschpresenter The University of Liverpool, Liverpool, United Kingdom M. Schwickert, T. Stöhlker GSI, Darmstadt, Germany T. Stöhlker IOQ, Jena, Germany C.P. Welschpresenter Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: This project has received funding from the European Union's Seventh Framework Programme, under grant agreement number 289485. Low-in­ten­sity charged par­ti­cle beams are par­tic­u­larly chal­leng­ing for non-per­tur­ba­tive beam di­ag­nos­tics due to the small am­pli­tude of in­duced elec­tro­mag­netic fields. The An­tipro­ton De­cel­er­a­tor (AD) and Extra Low EN­ergy An­tipro­ton (ELENA) rings at CERN de­cel­er­ate beams con­tain­ing 107 an­tipro­tons. An ab­solute in­ten­sity mea­sure­ment of the cir­cu­lat­ing beam is es­sen­tial to mon­i­tor the op­er­a­tional ef­fi­ciency and to pro­vide im­por­tant cal­i­bra­tion data for the an­ti­mat­ter ex­per­i­ments. This paper re­views the de­sign of an op­er­a­tional Cryo­genic Cur­rent Com­para­tor (CCC) based on Su­per­con­duct­ing QUan­tum In­ter­fer­ence De­vice (SQUID) for cur­rent and in­ten­sity mon­i­tor­ing in the AD. Such a sys­tem has been op­er­a­tional through­out 2017, re­ly­ing on a stand-alone cryo­genic in­fra­struc­ture based on a pulse-tube cry­ocooler. Sys­tem per­for­mance is pre­sented and cor­re­lated with dif­fer­ent work­ing en­vi­ron­ments, con­firm­ing a res­o­lu­tion in the nanoam­pere range.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML044
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THPML047	Design and Measurement of the X-Band Pulse Compressor for TTX	4745
	Y.L. Jiang, H.B. Chen, C. Cheng, W. Gai, J. Shi, P. Wang, Z.H. Wangpresenter, X.W. Wu, H. Zha TUB, Beijing, People's Republic of China
	A radio fre­quency (RF) pulse com­pres­sor had been de­signed for the X-band (11.424 GHz) high power test stands at the Ac­cel­er­a­tor Lab­o­ra­tory of Ts­inghua Uni­ver­sity. It is the SLED-I type pulse com­pres­sor, which uses a high qual­ity fac­tor cor­ru­gated cir­cu­lar cav­ity to store the RF power. An RF po­lar­izer cou­ples two quad­ra­ture modes into the cav­ity so that the pulse com­pres­sor needs only one cav­ity. The cav­ity im­ple­ments HE1-1-14 mode, with the Q0 of 115, 000 and the cou­pling fac­tor (β) of 3.23. The de­sign and the mi­crowave mea­sure­ment be­fore braz­ing of this pulse com­pres­sor are pre­sented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML047
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THPML051	Electron Acceleration by Plasma Wave in the Presence of a Transversely Propagated Laser with Magnetic Field	4749
	M. Yadav, S. C. Sharma DELTECH, New Delhi, India D.N. Gupta, M. Kaurpresenter University of Delhi, Delhi, India
	It has been re­vealed that a rel­a­tivis­tic plasma wave, hav­ing an ex­tremely large elec­tric field, may be uti­lized for the ac­cel­er­a­tion of plasma par­ti­cles. The large ac­cel­er­at­ing field gra­di­ent dri­ven by a plasma wave is the basic mo­ti­va­tion be­hind the ac­cel­er­a­tion mech­a­nism. Such a plasma wave can be ex­cited by a sin­gle laser in the form wake­field in laser-plasma in­ter­ac­tions. In this paper, we study the en­hance­ment of elec­tron ac­cel­er­a­tion by plasma wave in pres­ence of a laser* prop­a­gated per­pen­dic­u­lar to the prop­a­ga­tion of the wake wave. Elec­trons trapped in the plasma wave are ef­fec­tively ac­cel­er­ated by the ad­di­tional field of the laser com­bined with wake­field. The ad­di­tional res­o­nance pro­vided by the laser field con­tributes to the large en­ergy gain of elec­trons dur­ing ac­cel­er­a­tion. The res­o­nant en­hance­ment of elec­tron ac­cel­er­a­tion has been val­i­dated by sin­gle par­ti­cle sim­u­la­tions**. The de­pen­dence of en­ergy gain on laser in­ten­sity, laser spot size, ini­tial elec­tron en­ergy, and elec­tron tra­jec­to­ries have been in­ves­ti­gated. * G. D. Tsakiris, C. Gahn, and V. K. Tripathi, Phys. Plasmas 7, 3017 (2000) ** Maninder Kaur, and D. N. Gupta, IEEE, 45, p 2841 - 2847, (2017)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML051
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THPML052	Excitation of Plasma Wave by Lasers Beating in a Collisional and Mild-Relativistic Plasma	4752
SUSPF044	use link to see paper's listing under its alternate paper code
	M. Kaur, D.N. Gupta University of Delhi, Delhi, India
	Funding: Work supported by Department of Science and Technology (DST), Government of India. Ex­ci­ta­tion of plasma wave by two lasers beat­ing in a col­li­sional dom­i­nated rel­a­tivis­tic plasma is in­ves­ti­gated. We study the en­ergy ex­change be­tween a plasma wave and two co-prop­a­gat­ing lasers in plasma in­clud­ing the ef­fect of rel­a­tivis­tic mass change and elec­tron-ion col­li­sions. Two lasers, hav­ing fre­quency dif­fer­ence equal to the plasma fre­quency, ex­cite a plasma beat wave res­o­nantly by the pon­dero­mo­tive force, which obeys the en­ergy and mo­men­tum con­ser­va­tion*. The rel­a­tivis­tic ef­fect and the elec­tron-ion col­li­sion both con­tribute in en­ergy ex­change be­tween the in­ter­act­ing waves in the beat-wave ac­cel­er­a­tion mech­a­nism. Our study shows that the ini­tial phase dif­fer­ence be­tween in­ter­act­ing waves gen­er­ates a phase mis­match be­tween lasers and plasma wave, which al­ters the rate of am­pli­tude vari­a­tions of the in­ter­act­ing waves and, hence, af­fects the en­ergy ex­change be­tween the in­ter­act­ing waves**. This study may be cru­cial to de­sign a com­pact plasma ac­cel­er­a­tor in low-in­ten­sity regime***. *T. Tajima, and J. Dawson, Phys. Rev.Lett. 43, 267(1979) **D. N. Gupta, M. S. Hur, and H. Suk, J.Appl. Phys. 100, 103101 (2006) ***M. Kaur and D. N. Gupta, EuroPhysics letter 116, 35001 (2016).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML052
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THPML053	Computational Screening for Low Emittance Photocathodes	4755
	J.T. Paul, R.G. Hennig University of Florida, Gainesville, Florida, USA I.V. Bazarov, A. Galdi Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA S.S. Karkare, H.A. Padmore LBNL, Berkeley, California, USA
	The ma­jor­ity of pho­to­cath­ode ma­te­ri­als in use in ac­cel­er­a­tor ap­pli­ca­tions have been dis­cov­ered em­pir­i­cally through trial and error with lit­tle guid­ance from ma­te­r­ial sci­ence cal­cu­la­tions. Al­ter­na­tively, one can en­vi­sion a process which is heav­ily guided by com­pu­ta­tional search using lat­est ad­vances in den­sity func­tional the­ory (DFT). In this work, the Ma­te­ri­al­sPro­ject data­base is searched for po­ten­tial sin­gle crys­tal pho­to­cath­odes that would be suit­able for ul­tralow emit­tance beam pro­duc­tion. The ma­te­ri­als in the data­base are ini­tially screened on the basis of ex­per­i­men­tal prac­ti­cal­ity. Fol­low­ing this, the ex­pected emit­tance is cal­cu­lated from the DFT com­puted band struc­tures for the pre-screened ma­te­ri­als using the con­ser­va­tion of en­ergy and trans­verse mo­men­tum dur­ing pho­toe­mis­sion. Based on such com­pu­ta­tional screen­ing, we pro­vide a list of po­ten­tial low emit­tance pho­to­cath­ode ma­te­ri­als which can be in­ves­ti­gated ex­per­i­men­tally as high bright­ness elec­tron sources.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML053
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THPML054	Design Studies of an S-Band Multipacting Electron Gun	4759
SUSPF051	use link to see paper's listing under its alternate paper code
	C. Henkel, W. Hillert, V. Miltchev University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany K. Flöttmann DESY, Hamburg, Germany
	A mul­ti­pact­ing elec­tron gun (MEG) is a mi­cro-pulse elec­tron source based on sec­ondary elec­tron emis­sion in a res­o­nant mi­crowave cav­ity struc­ture for the gen­er­a­tion of low emit­tance elec­tron bunches with high rep­e­ti­tion rate. By the­o­ret­i­cal sim­u­la­tions a suit­able ra­dio-fre­quency gun de­sign at 3 GHz is es­tab­lished, si­mul­ta­ne­ously meet­ing the de­mands of bunch pro­duc­tion and am­pli­fi­ca­tion process as well as in­clud­ing the ef­fects of space charge and beam load­ing for the evo­lu­tion of a sta­ble beam. In this con­tri­bu­tion we show de­tailed sim­u­la­tion stud­ies of the im­pact of im­por­tant de­sign pa­ra­me­ters like me­chan­i­cal di­men­sions and choice of ma­te­r­ial on the av­er­age out­put cur­rent, which is in the order of sev­eral mA. For the ex­per­i­men­tal in­ves­ti­ga­tion a test setup is under con­struc­tion, which may demon­strate the ap­pli­ca­tion of MEG's as a se­ri­ous al­ter­na­tive or ad­di­tion to com­monly used elec­tron sources like thermionic and pho­to­cath­odes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML054
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THPML055	Scaled Studies on Radio Frequency Sources for Megawatt-Class Ionospheric Heaters	4763
	B.L. Beaudoin, T.M. Antonsen, J.A. Karakkad, A.H. Narayan, G.S. Nusinovich, K.J. Ruisardpresenter UMD, College Park, Maryland, USA R. Fischer Naval Research Laboratory (NRL), Washington, USA S.H. Gold, A. Ting NRL, Washington,, USA
	Funding: Funding for this project and travel is provided by the Air Force Office of Scientific Research under grant FA95501410019. The ionos­phere plays a promi­nent role in the per­for­mance of crit­i­cal civil­ian and mil­i­tary com­mu­ni­ca­tion sys­tems. The key in­stru­ment in Ionos­pheric Mod­i­fi­ca­tion (IM) re­search is a pow­er­ful, ground-based, High Fre­quency (HF) source of elec­tro­mag­netic waves known as a heater. With a mo­bile heater, in­ves­ti­ga­tors would be able to con­duct IM re­search at dif­fer­ent lat­i­tudes with­out build­ing a costly per­ma­nent in­stal­la­tion. A new highly ef­fi­cient Megawatt class of Radio Fre­quency sources is re­quired to re­duce the over­all power de­mands on a fully de­ploy­able sys­tem. Such a source has been de­scribed pre­vi­ously*. Re­sults of a scaled ex­per­i­ment, using the elec­tron beam pro­duced by a grid­ded gun to drive an ex­ter­nal lumped el­e­ment cir­cuit for high ef­fi­ciency radio fre­quency gen­er­a­tion is pre­sented. The IOT gun pro­duces an elec­tron beam bunched at the dri­ving fre­quency that is then col­lected by an ex­ter­nal cir­cuit for im­ped­ance match­ing to the load. Re­sults showed that ef­fects such as the in­ter­nal re­sis­tance of the in­duc­tor and de­flec­tion of beam elec­trons by the in­duced RF volt­ages on the beam col­lec­tor are im­por­tant con­sid­er­a­tions to be in­cluded in the de­sign of a prac­ti­cal de­vice. * B.L. Beaudoin, G.S. Nusinovich, G. Milikh, A. Ting, S. Gold, J.A. Karakkad, A.H. Narayan, D.B. Matthew, D.K. Papadopoulos, T.M. Antonsen Jr., Journal of Elec. Waves and Appl.,31,17,pp.1786, 2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML055
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THPML058	Recent Results from MICE on Multiple Coulomb Scattering and Energy Loss	4766
	P. Franchini University of Warwick, Coventry, United Kingdom
	Funding: STFC, DOE, NSF, INFN, and CHIPP Mul­ti­ple Coulomb scat­ter­ing and en­ergy loss are well known phe­nom­ena ex­pe­ri­enced by charged par­ti­cles as they tra­verse a ma­te­r­ial. How­ever, from re­cent mea­sure­ments made by the MuS­cat col­lab­o­ra­tion, it is known that the avail­able sim­u­la­tion codes (GEANT4, for ex­am­ple) over­es­ti­mate the scat­ter­ing of muons in low Z ma­te­ri­als. This is of par­tic­u­lar in­ter­est to the Muon Ion­iza­tion Cool­ing Ex­per­i­ment* (MICE) col­lab­o­ra­tion which has the goal of mea­sur­ing the re­duc­tion of the emit­tance of a muon beam in­duced by en­ergy loss in low Z ab­sorbers. MICE took data with­out mag­netic field suit­able for mul­ti­ple scat­ter­ing mea­sure­ments in the au­tumn of 2015 with the ab­sorber ves­sel filled with xenon and in the spring of 2016 using a lithium-hy­dride ab­sorber. In the au­tumn of 2016 MICE took data with mag­netic fields on and stud­ied the en­ergy loss of muons in a lithium-hy­dride ab­sorber. These data are all com­pared with the Bethe-Bloch for­mula and with the pre­dic­tions of var­i­ous mod­els, in­clud­ing the de­fault GEANT4 model. *Submitted by the MICE Speakers bureau, to be prepared and presented by a MICE member to be selected in due course
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THPML059	Re-Commissioning the Front End Test Stand Negative Hydrogen Ion Source, Beam Transport and Interlocks	4769
	S.R. Lawrie, R.E. Abel, M. Dudman, D.C. Faircloth, A.P. Letchford, J.H. Macgregor, M. Perkins, T. M. Sarmento, R.C. Searle, M. Whitehead, T. Wood STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The front end test stand (FETS) is a demon­stra­tor for a fu­ture high in­ten­sity, high duty fac­tor neg­a­tive hy­dro­gen (H') ion in­jec­tor. With the ra­dio-fre­quency quadru­pole (RFQ) near­ing in­stal­la­tion, the ion source has been re-com­mis­sioned in prepa­ra­tion for long-term op­er­a­tion. The 3 MeV beam ex­ceeds the ra­dio-ac­ti­va­tion en­ergy of com­mon en­gi­neer­ing ma­te­ri­als, so ra­di­a­tion shield­ing has been erected. A new in­ter­lock­ing scheme has been signed-off which in­te­grates the ex­ist­ing ion source high volt­age area with the new shield­ing ac­cess points, to en­sure that the ma­chine can op­er­ate safely dur­ing beam pro­duc­tion. The ex­ist­ing vac­uum arrange­ment has been ex­tended to in-clude the RFQ and medium en­ergy beam trans­port (MEBT) line. A new pro­gram­ma­ble logic con­troller (PLC) has been built to op­er­ate the en­tire vac­uum chain. The ion source high volt­age equip­ment has been up­graded to min­imise both spark rate and in­ten­sity. A col­li­mat­ing aper­ture and Fara­day cup have been in­stalled after the low en­ergy beam trans­port (LEBT) sec­tion to en­sure the beam is well aligned for in­jec­tion into the RFQ. Re-com­mis­sion­ing the ion source has given a rugged shake­down of all these new sys­tems be­fore beam is re­quired for the RFQ. *scott.lawrie@stfc.ac.uk
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THPML060	Virtual VELA-CLARA: The Development of a Virtual Accelerator	4773
	T.J. Price, H.M. Castaneda Cortes, D.J. Dunning, J.K. Jonespresenter, B.D. Muratori, D.J. Scott, B.J.A. Shepherd, P.H. Williams STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom R.F. Clarke, G. Cox STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	A Vir­tual Ac­cel­er­a­tor (VA) has been de­vel­oped to mimic the ac­cel­er­a­tors Ver­sa­tile Elec­tron Lin­ear Ac­cel­er­a­tor (VELA) and Com­pact Lin­ear Ac­cel­er­a­tor for Re­search and Ap­pli­ca­tions (CLARA). Its pur­pose is to test con­trol room ap­pli­ca­tions, run start-to-end sim­u­la­tions with mul­ti­ple sim­u­la­tion codes, ac­cu­rately re­pro­duce mea­sured beam prop­er­ties, con­duct 'vir­tual ex­per­i­ments'and gain in­sight into ‘hid­den beam pa­ra­me­ters'. This paper gives an overview into the cur­rent progress in con­struct­ing this VA, de­tail­ing the areas of: de­vel­op­ing a 'Vir­tual EPICS' con­trol sys­tem, using mul­ti­ple sim­u­la­tion codes (both par­ti­cle track­ing and an­a­lytic), the de­vel­op­ment of a ‘Mas­ter Lat­tice' and the con­struc­tion of a Python in­ter­face in which to run the VA.
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THPML061	X-Band Low Q Cavity Beam Position Monitor Study	4777
SUSPF093	use link to see paper's listing under its alternate paper code
	S.S. Cao SINAP, Shanghai, People's Republic of China Y.B. Leng, R.X. Yuan SSRF, Shanghai, People's Republic of China
	The high rep­e­ti­tion-rate and high peak bril­liance of X-ray free-elec­tron laser (XFEL) allow study­ing many sci­en­tific ex­per­i­ments that have not been fea­si­ble. To re­al­ize such high per­for­mance, a sub-mi­cron beam trans­verse po­si­tion mea­sure­ment is re­quired. The cav­ity-type beam po­si­tion mon­i­tor (CBPM), as a non-de­struc­tive di­ag­nos­tics tool with high po­ten­tial in res­o­lu­tion per­for­mance, has been ap­plied in dif­fer­ent free elec­tron laser fa­cil­i­ties (FELs). In this re­search, an X-band high band­width CBPM has been stud­ied and used for pre-re­search on bunch-by-bunch di­ag­nos­tic for the pulsed FEL with high rep­e­ti­tion-rate. Its band­width reaches 300 MHz. De­sign con­sid­er­a­tions and sim­u­la­tion re­sults of the CBPM have been dis­cussed and pre­sented in this paper.
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THPML062	A Beam Based Method to Optimize the SBPM System	4780
SUSPF095	use link to see paper's listing under its alternate paper code
	J. Chen SINAP, Shanghai, People's Republic of China L.W. Lai, Y.B. Leng, T. Wu, R.X. Yuan SSRF, Shanghai, People's Republic of China
	For the elec­tron ac­cel­er­a­tor, it is hoped that the tra­jec-tory of the beam can pass through the mag­netic cen­ter of the quadru­pole to min­i­mize the or­bital mo­tion caused by the in­sta­bil­ity of the power sup­ply. The rel­a­tive de­vi­a­tion be­tween the mag­netic cen­ter of quadru­pole and the elec-tric cen­ter of ad­ja­cent BPM is mea­sured by elec­tron beam usu­ally in var­i­ous ac­cel­er­a­tor fa­cil­i­ties. But for the stripline BPM (SBPM) sys­tem, in order to achieve the best per­for­mance, the beam tra­jec­tory should also need to pass through the elec­tri­cal cen­ter of the SBPM sys­tem. In this paper, a beam based method to op­ti­mize the SBPM sys­tem was pro­posed, the in­ten­sity of the mag­net power was scanned to change the beam po­si­tion in two-di­men­sion and com­bine the change trend of the sum sig­nal of ad­ja­cent SBPM to find out the rel­a­tive de­vi­a­tion of BPM elec­tric cen­ter and me­chan­i­cal cen­ter. Rel­e­vant beam ex­per­i­ment work on the Shang­hai Soft X-ray free elec­tron laser (SXFEL) and the ben­e­fit of this method will be ad­dressed as well.
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THPML063	Micro-Bunched Beam Production at FAST for Narrow Band THz Generation Using a Slit-Mask	4784
	J. Hyun Sokendai, Ibaraki, Japan D.J. Crawford, D.R. Edstrom, J. Ruan, J.K. Santucci, T. Sen, J.C.T. Thangaraj, R.M. Thurman-Keup Fermilab, Batavia, Illinois, USA
	We dis­cuss sim­u­la­tions and ex­per­i­ments on cre­at­ing mi­cro-bunch beams for gen­er­at­ing nar­row band THz ra­di­a­tion at the Fer­mi­lab Ac­cel­er­a­tor Sci­ence and Tech­nol­ogy (FAST) fa­cil­ity. The low-en­ergy elec­tron beam­line at FAST con­sists of a pho­toin­jec­tor-based RF gun, two L-band su­per­con­duct­ing ac­cel­er­at­ing cav­i­ties, a chi­cane, and a beam dump. The elec­tron bunches are length­ened with cav­ity phases set off-crest for bet­ter lon­gi­tu­di­nal sep­a­ra­tion and then mi­cro-bunched with a slit-mask in­stalled in the chi­cane. We car­ried out the ex­per­i­ments with 30 MeV elec­tron beams and de­tected sig­nals of the mi­cro-bunch­ing using a skew quadru­pole mag­net in the chi­cane. In this paper, the de­tails of mi­cro-bunch beam pro­duc­tion, the de­tec­tion of mi­cro-bunch­ing and com­par­i­son with sim­u­la­tions are de­scribed.
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THPML065	Preliminary Results of the Bunch Arrival-Time Monitor at SXFEL	4787
	J.G. Wang, B. Liu SINAP, Shanghai, People's Republic of China
	Based on an elec­tro-op­ti­cal in­ten­sity mod­u­la­tion de­tec­tion scheme, a Bunch Ar­rival-time Mon­i­tor (BAM) is under study at Shang­hai soft X-ray Free Elec­tron Laser (SXFEL) to meet the high-res­o­lu­tion re­quire­ments of the mea­sure­ment of bunch ar­rival time. The first BAM is in­stalled and is being tested at the SXFEL up­stream of the first short un­du­la­tor (mod­u­la­tor) near the seed laser in­jec­tion point. In this paper, we pre­sent the basic work­ing prin­ci­ple, the de­sign of the BAM sys­tem and re­port the pre­lim­i­nary test re­sults.
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THPML066	Filling Pattern Measurement System Upgrade in SSRF*	4791
	N. Zhang, F.Z. Chenpresenter, Y.M. Zhou SSRF, Shanghai, People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China (No.11575282 No.11375255 No.11305253) Fill­ing pat­tern af­fects var­i­ous op­er­a­tion per­for­mance of a syn­chro­tron light source. A new di­ag­nos­tic beam charge mon­i­tor (BCM) with high band­width multi-chan­nels dig­i­tizer was de­vel­oped to per­form bunch-by-bunch charge mea­sure­ment and record fill­ing pat­tern for SSRF stor­age ring. Sig­nals picked up from but­ton elec-trodes were sam­pled syn­chro­nously with RF fre­quency, and IQ (In-phase and Quad­ra­ture phase) sam­pling meth-od was em­ployed for noise-fil­ter­ing and phase in­de­pend-ence cal­i­bra­tion. Lay­out and eval­u­a­tion ex­per­i­ment of the sys­tem are pre­sented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML066
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THPML067	SXFEL Linac BPM System Development and Performance Evaluation	4794
SUSPF094	use link to see paper's listing under its alternate paper code
	F.Z. Chen, T. Wu SSRF, Shanghai, People's Republic of China J. Chen, L.W. Lai, Y.B. Leng, L.Y. Yu, R.X. Yuan SINAP, Shanghai, People's Republic of China
	Shang­hai Soft X-ray Free Elec­tron Laser (SXFEL) is a test fa­cil­ity to study key tech­nolo­gies and new FEL physics. In order to de­liver high qual­ity elec­tron beams to the un­du­la­tor sec­tion, a high res­o­lu­tion (bet­ter than 10 mi­crons with 200pC beam) Linac beam po­si­tion mon­i­tor sys­tem has been de­vel­oped. The sys­tem con­sists of stripline pickup and cus­tom de­signed DBPM proces­sor. The hard­ware and soft­ware ar­chi­tec­ture will be in­tro­duced in this paper. The on­line per­for­mance eval­u­a­tion re­sults will be pre­sented as well.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML067
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THPML068	Upgrade of Bunch Phase Monitor at SSRF Storage Ring	4797
	Y.M. Zhou, Y.B. Lengpresenter, T. Wu, N. Zhang SSRF, Shanghai, People's Republic of China
	Beam in­sta­bil­ity is a se­ri­ous prob­lem for physics in beam di­ag­no­sis tech­nol­ogy. With re­gard to the eval­u­a­tion of lon­gi­tu­di­nal phase os­cil­la­tions dur­ing the tran­sient in­jec­tion process, bunch-by-bunch phase mea­sure­ment is a use­ful tool for study­ing the be­hav­ior of the re­filled bunches. A new up­graded beam phase mon­i­tor sys­tem with 1.2GHz band­width PXI wave­form dig­i­tizer has been de­vel­oped at Shang­hai syn­chro­tron ra­di­a­tion source (SSRF). Bunch-by-bunch phase in­for­ma­tion, re­trieved from but­ton pickup sig­nals, is cal­cu­lated by the zero-cross­ing de­tec­tion method with the best phase res­o­lu­tion of 0.4ps. The re­filled bunches can be sep­a­rated from the stored ones, and the lon­gi­tu­di­nal off­set of each re­filled bunch has been mea­sured. Sev­eral groups of ex­per­i­ments have been per­formed to ver­ify the re­peata­bil­ity of bunch-by-bunch phase mea­sure­ment, and some re­sults re­gard­ing re­filled bunches will be dis­cussed in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML068
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THPML069	The Control System Design of SCLF	4800
	Y.B. Yan, J.G. Ding, G.Y. Jiang, Y.B. Lengpresenter SSRF, Shanghai, People's Republic of China J.F. Chen SINAP, Shanghai, People's Republic of China
	The high-gain free elec­tron lasers have given sci­en­tists hopes for new sci­en­tific dis­cov­er­ies in many fron­tier re­search areas. The Shang­hai Co­her­ent Light Fa­cil­ity (SCLF) was pro­posed by the cen­tral gov­ern­ment of China on April 2017, which is a quasi-con­tin­u­ous wave hard X-ray free elec­tron laser fa­cil­ity. The con­trol sys­tem is re­spon­si­ble for the fa­cil­ity-wide de­vice con­trol, data ac­qui­si­tion, ma­chine pro­tec­tion, high level data­base or ap­pli­ca­tion, as well as net­work and com­put­ing plat­form. It will be mainly based on EPICS to reach the bal­ance be­tween the high per­for­mance and costs of main­te­nance. The lat­est tech­nol­ogy will be adopted for the high rep­e­ti­tion rate data ac­qui­si­tion and feed­back sys­tem. The de­tails of the con­trol sys­tem de­sign will be re­ported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML069
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THPML070	Point Spread Function Study of Quasi-Monochromatic X-Ray Pinhole Camera at SSRF	4803
	B. Gao, H.J. Chen SINAP, Shanghai, People's Republic of China J. Chen, Y.B. Lengpresenter SSRF, Shanghai, People's Republic of China
	Since 2009 an X-ray pin­hole cam­era that has been used to pre­sent the trans­verse beam size and emit­tance on di­ag­nos­tic beam line of the stor­age ring at SSRF. The real beam size is a func­tion of the image size of the CCD cam­era and point spread func­tion (PSF) of the sys­tem. The per­for­mance of the mea­sure­ment of the trans­verse elec­tron beam size is given by the width of the PSF of X-ray pin­hole cam­era. The con­tri­bu­tions to the PSF width are the PSF of pin­hole it­self due to dif­frac­tion, and the PSF of the screen and cam­era. An X-ray mono­chro­matic sys­tem has been es­tab­lished to mea­sure the PSF ac­cu­rately, and de­crease the vari­a­tion in the beam size be­tween the the­o­ret­i­cal val­ues and the mea­sured ones at SSRF. In this ar­ti­cle, both cal­cu­lated and mea­sured PSF of quasi-mono­chro­matic X-ray pin­hole cam­era will be pre­sented in de­tail.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML070
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THPML071	Upgrade of Digital BPM Processor at DCLS and SXFEL	4807
	L.W. Lai, F.Z. Chen, Y.B. Lengpresenter, T. Wu, Y.B. Yan SSRF, Shanghai, People's Republic of China J. Chen SINAP, Shanghai, People's Republic of China
	A dig­i­tal BPM proces­sor has been de­vel­oped at 2016 in SINAP for DCLS and SXFEL, which are FEL fa­cil­i­ties built in China. The stripline BPM and cav­ity BPM proces­sors share the same hard­ware plat­form and firmware, but the pro­cess­ing al­go­rithms im­ple­mented in EPICS IOC on the ARM CPU are dif­fer­ent. The ca­pa­bil­ity of the ARM lim­its the pro­cess­ing speed to 10 bunches per sec­ond. Now the bunch rate of DCLS and SXFEL are going to in­crease from 10Hz to 50Hz. To meet the higher pro­cess­ing speed re­quire­ments, the proces­sor firmware and soft­ware are up­graded in 2017. All BPM sig­nal pro­cess­ing al­go­rithms are im­ple­mented in FPGA, and EPICS IOC reads re­sults only. After the up­grade, the pro­cess­ing speed reach 120 bunches per sec­ond. And this is also a good prepa­ra­tion for fu­ture Shang­hai Hard-X ray FEL, which bunch rate is about 1MHz.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML071
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THPML072	Injection Comparison using Bunch-by-Bunch Beam Size Measurement System at SSRF	4811
	H.J. Chen, J. Chen, B. Gao, Y.B. Lengpresenter SINAP, Shanghai, People's Republic of China
	In­jec­tion tran­sient process hap­pens every 5-10 min­utes in stor­age ring dur­ing nor­mal top-up op­er­at­ing mode at SSRF, which is a proper win­dow for ma­chine sta­tus and in­jec­tion per­for­mance eval­u­a­tion. In the re­cent year, a bunch-by-bunch beam size mea­sure­ment sys­tem has been im­ple­mented at SSRF, which has the ca­pa­bil­ity to offer trans­verse bunch-by-bunch po­si­tion and size in­for­ma­tion and is a pow­er­ful tool for in­jec­tion study. In this paper, we sum­ma­rize three in­jec­tion study re­sults from July 2017 to April 2018, in­clud­ing be­ta­tron os­cil­la­tion am­pli­tude, spec­trum, hor­i­zon­tal tune and damp­ing time com­par­i­son. The os­cil­la­tion am­pli­tude and tem­po­ral be­hav­ior of re­cent in­jec­tion are all bet­ter than re­sults be­fore con­tributed to the in­jec­tion op­ti­miza­tion work dur­ing main­te­nance in 2018 win­ter. In ad­di­tion, the prin­ci­pal com­po­nent analy­sis method is also ap­plied to fur­ther study the in­jec­tion be­hav­ior in turn-by-turn or bunch-by-bunch di­rec­tion to the re­filled bucket.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML072
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THPML073	Measurement of the RF Reference Phase Stability in the SuperKEKB Injector LINAC	4815
SUSPL063	use link to see paper's listing under its alternate paper code
	N. Liu Sokendai, Ibaraki, Japan D.A. Arakawa, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, F. Qiu, Y. Yano KEK, Ibaraki, Japan
	The Su­perKEKB in­jec­tor is a more than 600 m J-shaped LINAC. The re­quire­ment of the RF phase re­fer-ence sta­bil­ity is 0.1 de­gree (RMS) at 2856 MHz for Su­perKEKB PHASE-2 com­mis­sion­ing. In order to clari-fy and im­prove the ref­er­ence line per­for­mance, the RF ref­er­ence phase sta­bil­ity is mea­sured. The phase noise of the RF ref­er­ence at each sec­tor is shown in this paper. A new phase mon­i­tor sys­tem is im­ple­mented to mea­sure the short-term sta­bil­ity and long-term drift due to the tem­per­a­ture and hu­mid­ity fluc­tu­a­tions in the kly­stron gallery.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML073
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THPML074	Image Reconstruction Technique Based on Coded Aperture Imaging for SuperKEKB X-ray Beam Size Monitor	4819
SUSPF105	use link to see paper's listing under its alternate paper code
	E. Mulyani, J.W. Flanagan Sokendai, Ibaraki, Japan J.W. Flanagan, H. Fukuma, H. Ikeda, M. Tobiyama KEK, Ibaraki, Japan
	The fast re­con­struc­tion tech­niques based on prin­ci­ples orig­i­nally de­vel­oped for coded aper­ture imag­ing have been in­ves­ti­gated for Su­perKEKB ac­cel­er­a­tor. The es­tab­lish­ment of this tech­nique will very im­por­tant for mea­sur­ing the beam sizes of all 2500 bunches in the Su­perKEKB ac­cel­er­a­tor over thou­sands of turns, as needed for in­sta­bil­ity stud­ies and lu­mi­nos­ity tun­ing, due to the vast quan­tity of data that needs to be processed in a timely man­ner.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML074
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THPML075	MYRRHA Control System Development	4823
	R. Modic, M. Pavleski, T. Zagar Cosylab, Ljubljana, Slovenia J. Belmans, P. Della Faille, D. Vandeplasschepresenter Studiecentrum voor Kernenergie - Centre d'Étude de l'énergie Nucléaire (SCK•CEN), Mol, Belgium
	MYRRHA ADS (Ac­cel­er­a­tor Dri­ven Sys­tem), the pro­to­type of a nu­clear re­ac­tor dri­ven by a par­ti­cle ac­cel­er­a­tor, is being re­al­ized through a staged ap­proach. This paper will ex­plore the Con­trol Sys­tem (CS) strat­egy for the cur­rent stage of the ac­cel­er­a­tor R&D, where the goal is in­jec­tor for the en­er­gies up to 5.9 MeV. Ac­cel­er­a­tor com­po­nents are being de­liv­ered within in­ter­na­tional semi-in­dus­trial part­ner­ships. Cur­rently the RFQ, MYRRHA's first RF struc­ture, is being in­tro­duced. It will be fol­lowed by the first Medium En­ergy Beam Trans­port (MEBT1) and sev­eral nor­mal-con­duct­ing CH cav­i­ties. As the port­fo­lio and num­ber of de­vices and sys­tems grows there is in­creased push to­wards stan­dard­iza­tion of in­te­gra­tion pro­ce­dures, in­ter­faces to sys­tem-wide ser­vices, con­fig­u­ra­tion man­age­ment. Sev­eral part­ners pro­vide com­po­nents with vary­ing level of ver­ti­cal in­te­gra­tion. The re­spon­si­bil­ity of the Con­trol Sys­tem in­te­gra­tor is there­fore shift­ing to­wards pro­vi­sion of in­te­gra­tion guide­lines, con­fig­u­ra­tion and de­ploy­ment of cen­tral ser­vices and man­age­ment tools, train­ing to the con­tribut­ing de­vel­op­ers, help with spec­i­fi­ca­tions and re­quire­ments, qual­ity in­sur­ance and ac­cep­tance cri­te­ria.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML075
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THPML076	Design of Control System for Dual-Head Radiation Therapy	4826
SUSPL059	use link to see paper's listing under its alternate paper code
	H.S. Kim, J.-S. Chai, M. Ghergherehchi, D.H. Ha, J.C. Lee, H. Namgoong, J.H. Seo, Shin, S.W. Shin SKKU, Suwon, Republic of Korea D. Lipka DESY, Hamburg, Germany
	Sungkyunkwan Uni­ver­sity groups have been de­vel­oped ad­vanced ra­di­a­tion ther­apy ma­chine named dual-head ra­di­a­tion ther­apy gantry for re­duc­ing the treat­ment time by up to 30%. The main dif­fer­ence be­tween pre­vi­ous ra­di­a­tion ther­apy ma­chine is using two elec­tron LINAC as X-ray sources at ra­di­a­tion ther­apy. In sup­port of this sys­tem, con­trol sys­tem based on SCADA and hard­ware de­vel­op­ment was im­ple­mented. The con­trol sys­tem con­sists of su­per­vi­sory com­put­ers and local con­trollers and the con­trol net­work was eth­er­net and soft­ware was writ­ten by lab­VIEW. An overview of this con­trol sys­tem is pre­sented in paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML076
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THPML077	Status of the Machine Protection System for ARIEL e-linac	4829
	M. Alcorta, D. Dale, H. Hui, S.R. Koscielniak, K. Langton, K. LeBlanc, M. Rowe TRIUMF, Vancouver, Canada
	The Ad­vanced Rare Iso­tope & Elec­tron Linac (ARIEL) fa­cil­ity at TRI­UMF con­sists of an elec­tron lin­ear ac­cel­er­a­tor (e-linac) ca­pa­ble of cur­rents up to 10 mA at an en­ergy of 30 MeV, giv­ing a total avail­able beam power of 300 kW. In ad­di­tion, the e-linac can be run in pulsed op­er­a­tion down to beam pulses of 5 μs, up to CW. A Ma­chine Pro­tec­tion Sys­tem (MPS) is re­quired to pro­tect the ac­cel­er­a­tor from haz­ardous beam spills and must turn off the elec­tron gun within 10 μs of de­tec­tion. The MPS con­sists of two types of beam loss mon­i­tors, a front-end beam loss mon­i­tor board de­vel­oped at TRI­UMF, and EPICS-based con­trols to es­tab­lish op­er­at­ing modes. A trip time of 10 μs has been demon­strated, along with a 106 dy­namic range and sen­si­tiv­ity down to 100 pA. This paper is fo­cused on the cur­rent sta­tus of the beam loss mon­i­tor de­tec­tion sys­tem.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML077
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THPML078	Web-Based Control Room Applications at TRIUMF	4832
	C.B. Barquest, P. M. Jung, S. Kiy, K.E. Lucow, T. Planche, S.D. Rädel, B.E. Schultz, D. Sehayek, O. Shelbaya, D. Tattan TRIUMF, Vancouver, Canada M. Corwin, S. Marcano UW/Physics, Waterloo, Ontario, Canada
	Con­trol room ap­pli­ca­tions are pro­grams that in­ter­face with con­trol sys­tems and beam physics mod­els. These tools range from real-time di­ag­nos­tic vi­su­al­iza­tions to post-pro­cess­ing data analy­sis. At TRI­UMF, the con­cept of web-based con­trol room ap­pli­ca­tions has been adopted to ad­vance the ca­pa­bil­i­ties of these ap­pli­ca­tions and fa­cil­i­tate op­er­a­tions. This on­line model takes ad­van­tage of server-based con­tin­u­ous in­te­gra­tion and a cen­tral­ized mid­dle­ware layer. Con­tin­u­ous in­te­gra­tion of server-based ap­pli­ca­tions al­lows for easy de­ploy­ment and main­te­nance. A cen­tral­ized mid­dle­ware layer al­lows a sin­gle ap­pli­ca­tion to work for many dif­fer­ent ac­cel­er­a­tor con­fig­u­ra­tions. Some mo­ti­vat­ing ex­am­ples of web-based ap­pli­ca­tions cur­renly being de­vel­oped are pre­sented, demon­strat­ing this on­line ap­proach to be an ef­fec­tive method for de­ploy­ing ap­pli­ca­tions for use in the con­trol room and be­yond.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML078
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THPML079	Multipole Tuning Algorithm for the CANREB HRS at TRIUMF	4836
	D. Sehayek, R.A. Baartman, C.B. Barquestpresenter, J.A. Maloney, M. Marchetto, T. Planche TRIUMF, Vancouver, Canada
	The TRI­UMF CANa­dian Rare iso­tope fa­cil­ity with Elec­tron Beam ion source (CAN­REB) High Res­o­lu­tion Sep­a­ra­tor (HRS) has been de­signed to sep­a­rate rare iso­topes with mass/charge dif­fer­ences of only one part in 20,000 for beams with trans­verse emit­tances of 3 μm. To reach this res­o­lu­tion, high-or­der aber­ra­tions must be cor­rected using a mul­ti­pole cor­rec­tor. From ex­pe­ri­ence, tun­ing such a mul­ti­pole is very chal­leng­ing. The unique geom­e­try of our mul­ti­pole mo­ti­vated a novel tun­ing method based on de­ter­min­ing the de­sired pole volt­ages di­rectly from mea­sured em­mi­tance. This novel tun­ing al­go­rithm is pre­sented along­side a web ap­pli­ca­tion which has been de­vel­oped in an­tic­i­pa­tion of the com­mis­sion­ing of the HRS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML079
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THPML080	Preliminary Results of a New High Brightness H− Ion Source Developed at TRIUMF	4839
	K. Jayamanna, F. Ames, Y. Bylinskiipresenter, J.Y. Cheng, M. Lovera, M. Minato TRIUMF, Vancouver, Canada
	This paper de­scribes the pre­lim­i­nary re­sults of a high bright­ness ion source de­vel­oped at TRI­UMF, which is ca­pa­ble of pro­duc­ing a neg­a­tive hy­dro­gen ion beam (H−) of up to 5 mA of di­rect cur­rent. A 1.7 mm.​mrad and 5 mm.​mrad emit­tance(rms) is achieved for 500 uA and for 1 mA H-, re­spec­tively. Char­ac­ter­is­tics as well as a brief de­scrip­tion re­gard­ing ex­trac­tion is­sues of the source to date are also pre­sented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML080
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THPML081	Beam-Based Measurements of the ISAC-II Superconducting Heavy Ion Linac	4841
	S. Kiy, R.E. Laxdal, M. Marchetto, S.D. Rädel, O. Shelbaya TRIUMF, Vancouver, Canada
	Prepa­ra­tion for ex­per­i­ments, which typ­i­cally run for one to two weeks in the ISAC-II fa­cil­ity at TRI­UMF, re­quires some amount of over­head, lim­it­ing the ef­fi­ciency of the fa­cil­ity. Ef­forts are un­der­way to im­prove the ISAC-II linac model to re­duce this over­head while also im­prov­ing the qual­ity of the de­liv­ered ion beam. This can be ac­com­plished with beam-based mea­sure­ments and cor­rec­tions of align­ment, cav­ity gra­di­ents, focal strengths, and more. A re­view of the pre­sent state of the linac will be given, in­clud­ing mea­sured mis-align­ments and other fac­tors that af­fect the re­pro­ducibil­ity of tunes. The out­look on ex­pected im­prove­ments will also be sum­ma­rized, in­clud­ing progress on the au­to­matic phas­ing of cav­i­ties with a focus on in­te­gra­tion to the High Level Ap­pli­ca­tion plat­form being de­vel­oped at TRI­UMF. Lastly, a sum­mary will be given on the ex­pected par­a­digm shift in the tun­ing ap­proach taken: mov­ing from re-ac­tive tun­ing by op­er­a­tors or beam de­liv­ery ex­perts to pro-ac­tive mea­sure­ments and in­ves­ti­ga­tions, ver­sion-con­trolled tunes, and con­tin­u­ous feed­back from beam physi­cists.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML081
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THPML082	Reflected Power Based Extremum Seeking Control Algorithm to Tune the Resonance Frequency of Room Temperature Cavities	4844
	R. Leewe, K. Fong, Z. Shahriari TRIUMF, Vancouver, Canada M. Moallem SFU, Surrey, Canada
	A slid­ing mode ex­tremum seek­ing al­go­rithm to tune the res­o­nance fre­quency was im­ple­mented in two of TRI­UMF's DTL tanks. The tun­ing al­go­rithm searches for the min­i­mum re­flected power point and was de­vel­oped to elim­i­nate the highly tem­per­a­ture de­pen­dent phase mea­sure­ment, which was pre­vi­ously used to tune the res­o­nance fre­quency. Short and long term mea­sure­ment re­sults show that the tun­ing al­go­rithm com­pen­sates for the RF heat­ing ef­fect as well as for di­ur­nal tem­per­a­ture vari­a­tions. Re­flected power mea­sure­ments of TRI­UMF's DTL tank 3 were taken for both cases of op­er­at­ing the phase based tun­ing sys­tem and the re­flected power based tun­ing sys­tem, with an out­come of a higher tun­ing ac­cu­racy of the newly de­vel­oped sys­tem. An­other ad­van­tage is a quick cav­ity start up time, as the re­flected power based sys­tem does not rely on a ref­er­ence set point which has do be ad­justed man­u­ally. The slid­ing mode ex­tremum seek­ing con­trol loop is cur­rently com­mis­sioned in fur­ther room tem­per­a­ture cav­i­ties of the TRI­UMF's ISAC I fa­cil­ity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML082
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THPML083	Iterative Learning Control to Cancel Beam Loading Effect on Amplitude and Phase of the Accelerating Field	4847
	Z. Shahriari, K. Fong TRIUMF, Vancouver, Canada G. A. Dumont UBC, Vancouver, Canada
	Funding: This research is supported by TRIUMF through federal funding via a contribution agreement with the National Research Council of Canada. It­er­a­tive learn­ing con­trol (ILC) is an open loop con­trol strat­egy that im­proves the per­for­mance of a repet­i­tive sys­tem through learn­ing from pre­vi­ous it­er­a­tions. ILC can be used to com­pen­sate for a repet­i­tive dis­tur­bance like the beam load­ing ef­fect in res­onators. As­sum­ing that the beam load­ing dis­tur­bance is iden­ti­cal for all it­er­a­tions, the learn­ing law can be non-causal; it can an­tic­i­pate the dis­tur­bance and pre­emp­tively coun­ter­act its ef­fect. In this work, we aim to use ILC to can­cel beam load­ing ef­fect on am­pli­tude and phase. Feed­back con­trollers are not fast enough for this pur­pose. A nor­mal feed for­ward con­troller may not be suf­fi­cient as well if there is a dif­fer­ence be­tween the feed for­ward sig­nal and the beam load­ing cur­rent. There­fore, the goal is to use ILC to adap­tively can­cel the beam load­ing ef­fect.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML083
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THPML084	Validating the COBEA Algorithm at the DELTA Storage Ring	4851
	B. Riemann, B.D. Isbarn, S. Khan, S. Koetterpresenter, T. Weis DELTA, Dortmund, Germany
	Closed-Or­bit Bi­lin­ear-Ex­po­nen­tial Analy­sis (COBEA) is an al­go­rithm to de­com­pose mon­i­tor-cor­rec­tor re­sponse ma­tri­ces into (scaled) beta op­tics val­ues, phase ad­vances, scaled dis­per­sion and be­ta­tron tunes. No ex­plicit mag­netic lat­tice model is re­quired for COBEA - only the se­quence of mon­i­tors and cor­rec­tors along the beam path (no lengths, no strengths ap­proach). To ob­tain ab­solute beta val­ues, the length of one drift space can be pro­vided as op­tional input. In this work, the ap­pli­ca­tion of COBEA to the DELTA stor­age ring, op­er­ated by TU Dort­mund Uni­ver­sity, is dis­cussed, and its re­sults for be­ta­tron tunes and scaled dis­per­sion are com­pared with those of con­ven­tional, di­rect mea­sure­ment meth­ods. COBEA is also put in a his­tor­i­cal per­spec­tive to other di­ag­nos­tic al­go­rithms. Im­prove­ments in the Python im­ple­men­ta­tion of COBEA, which is avail­able as free soft­ware, are pre­sented. Due to COBEA being rel­a­tively mod­est re­gard­ing its re­quire­ments on input data re­spec­tively hard­ware, it should be ap­plic­a­ble to the ma­jor­ity of ex­ist­ing stor­age rings.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML084
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THPML085	Intelligent Controls for the Electron Storage Ring DELTA	4855
	D. Schirmer DELTA, Dortmund, Germany
	In re­cent years, ar­ti­fi­cial in­tel­li­gence has be­come one of the buzz­words in the field of con­trol­ling, mon­i­tor­ing and op­ti­miz­ing com­plex ma­chines. Par­ti­cle ac­cel­er­a­tors be­long to this class of ma­chines in par­tic­u­lar. In ac­cel­er­a­tor con­trols one has to deal with a va­ri­ety of time-vary­ing pa­ra­me­ters, non­lin­ear dy­nam­ics as well as a lot of small, com­pound­ing er­rors. There­fore, to cope with these tasks and to achieve higher per­for­mance, par­ti­cle ac­cel­er­a­tors re­quire new ad­vanced strate­gies in con­trols and feed­back sys­tems. Ma­chine learn­ing through (deep) neural net­works, ge­netic al­go­rithms, swarm in­tel­li­gence and adap­tive con­trols are some of the pro­posed ap­proaches. In­creased com­pu­ta­tional ca­pa­bil­ity and the avail­abil­ity of large data sets in com­bi­na­tion with bet­ter the­o­ret­i­cal un­der­stand­ing of new net­work ar­chi­tec­tures and train­ing par­a­digms allow for promis­ing ap­proaches for novel de­vel­op­ments. This re­port aims to dis­cuss the state of the art tech­niques and pre­sents ideas for pos­si­ble ap­pli­ca­tions of in­tel­li­gent con­trols at the syn­chro­tron ra­di­a­tion source DELTA.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML085
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THPML087	First ERL Operation of S-DALINAC and Commissioning of a Path Length Adjustment System	4859
	M. Arnold, C. Burandt, R. Grewepresenter, J. Pforr, N. Pietralla, M. Steinhorst TU Darmstadt, Darmstadt, Germany C. Eschelbach, M. Lösler Frankfurt University of Applied Sciences, Frankfurt am Main, Germany F. Hug KPH, Mainz, Germany
	Funding: Work supported by DFG through GRK 2128 and INST163/383-1/FUGG The S-DALINAC is run­ning in re­cir­cu­lat­ing op­er­a­tion since 1991. In 2015/2016 a major up­grade was per­formed by adding a third re­cir­cu­la­tion beam line. The ver­sa­til­ity of this re­cir­cu­la­tion beam line en­ables a phase shift of the beam of up to 360° of the RF phase. The re­quired range of 10 cm for a 3 GHz RF fre­quency is re­al­ized by a path length ad­just­ment sys­tem. A com­ple­men­tary op­er­a­tion in nor­mal scheme (sin­gle-pass, once or thrice re­cir­cu­lat­ing with ac­cel­er­a­tion) or ERL mode (once or twice) is pos­si­ble by ap­pro­pri­ate ad­just­ment of this sys­tem. After in­stal­la­tion this sys­tem was aligned prop­erly and its func­tion­al­ity and stroke was checked with­out beam. The sys­tem was com­mis­sioned by mea­sur­ing the change of the beam phase in de­pen­dency of the set­ting of the path length ad­just­ment sys­tem. The com­ple­men­tary usage of the newly in­stalled re­cir­cu­la­tion for once re­cir­cu­lat­ing with ac­cel­er­a­tion and once re­cir­cu­lat­ing with ERL mode has been shown suc­cess­fully in au­tumn 2017. This con­tri­bu­tion will pro­vide an overview on the path length ad­just­ment sys­tem and the first run of the once re­cir­cu­lat­ing ERL mode of the S-DALINAC.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML087
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THPML088	Cavity Impedance Reduction Strategies During Multi Cavity Operation in the SIS100 High Intensity Hadron Synchrotron	4863
	D. Mihailescu Stoica, D. Domont-Yankulova Technische Universität Darmstadt (TU Darmstadt, RMR), Darmstadt, Germany D. Domont-Yankulova, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany H. Klingbeil, D.E.M. Lens GSI, Darmstadt, Germany
	Funding: Supported by GSI Helmholtzzentrum für Schwerionenforschung GmbH The planned SIS100 heavy ion syn­chro­tron at the GSI Helmholtzzen­trum für Schw­e­ri­o­nen­forschung will pos­sess twenty fer­rite ac­cel­er­at­ing cav­i­ties in its final stage of ex­ten­sion. As at in­jec­tion and at flat top dur­ing slow ex­trac­tion of the planned ac­cel­er­a­tion cy­cles the RF volt­age will be rel­a­tively low, not all cav­i­ties will be ac­tive in this part of op­er­a­tion. It is im­por­tant to analyse the im­pact of the in­ac­tive cav­i­ties on the over­all RF volt­age and sub­se­quently their im­pli­ca­tion on the lon­gi­tu­di­nal par­ti­cle dy­nam­ics. Clas­si­cal ap­proaches for re­duc­ing the beam im­ped­ance con­sist of ac­tive de­tun­ing of the cav­i­ties to pre-de­scribed park­ing fre­quen­cies. The fact that two out of ten buck­ets have to stay empty in all SIS100 sce­nar­ios is of par­tic­u­lar in­ter­est as ad­di­tional fre­quency com­po­nents ap­pear in the ex­ci­ta­tory beam cur­rent, which have to be con­sid­ered when the cav­ity is de­tuned. There­fore multi-cav­ity par­ti­cle track­ing sim­u­la­tions, con­sist­ing of twenty cav­i­ties and their at­tached LLRF con­trol sys­tems, are car­ried out in order to analyse dif­fer­ent pos­si­bil­i­ties to min­i­mize the im­pact on the beam dy­nam­ics and emit­tance growth.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML088
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THPML089	Tuning of 3-tap Bandpass Filter During Acceleration for Longitudinal Beam Stabilization at FAIR	4866
	B.R. Reichardt, D. Domont-Yankulova Technische Universität Darmstadt (TU Darmstadt, RMR), Darmstadt, Germany D. Domont-Yankulova, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany H. Klingbeil, D.E.M. Lens GSI, Darmstadt, Germany
	Dur­ing ac­cel­er­a­tion in the heavy-ion syn­chro­trons SIS18/SIS100 at GSI/FAIR lon­gi­tu­di­nal beam os­cil­la­tions are ex­pected to occur. To re­duce lon­gi­tu­di­nal emit­tance blow-up, dedi- cated LLRF beam feed­back sys­tems are planned. To date, damp­ing of lon­gi­tu­di­nal beam os­cil­la­tions has been de­mon- strated in SIS18 ma­chine ex­per­i­ments with a 3-tap fil­ter con­troller (e.g. *), which is ro­bust in re­gard to con­trol pa- ram­e­ters and also to noise. On ac­cel­er­a­tion ramps the con­trol pa­ra­me­ters have to be ad­justed to the vary­ing syn­chro­tron fre­quency. Pre­vi­ous re­sults from beam ex­per­i­ments at GSI in­di­cate that a pro­por­tional tun­ing rule for one pa­ra­me­ter and an in­versely pro­por­tional tun­ing rule for a sec­ond pa­ra­me­ter is fea­si­ble, but the ob­tained damp­ing rate may not be opti- mal for all syn­chro­tron fre­quen­cies dur­ing the ramp. In this work, macro-par­ti­cle sim­u­la­tions are per­formed to eval­u­ate, whether it is suf­fi­cient to ad­just the con­trol pa­ra­me­ters pro- por­tion­ally (in­versely pro­por­tion­ally) to the change in the lin­ear syn­chro­tron fre­quency, or if it is nec­es­sary to take more pa- ram­e­ters, such as bunch-length and syn­chro­nous phase, into ac­count to achieve sta­bil­ity and a con­sid­er­able high damp­ing rate for ex­cited lon­gi­tu­di­nal di­pole beam os­cil­la­tions. This is done for sin­gle- and dual-har­monic ac­cel­er­a­tion ramps. * H. Klingbeil et al., "A Digital Beam-Phase Control System for Heavy-Ion Synchrotrons", in IEEE Transactions on Nuclear Science, vol. 54, no. 6, pp. 2604-2610, Dec. 2007.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML089
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THPML090	Optical Beam Loss Monitors Based on Fibres for the CLARA Phase 1 Beam-Line	4869
	A.S. Alexandrova, L.J. Devlin, V. Tzoganis, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom A.D. Brynes, F. Jackson STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom A.D. Brynes, F. Jackson, V. Tzoganis, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom E. Effinger, E.B. Holzer CERN, Geneva, Switzerland
	Funding: Work supported by STFC Cockcroft Institute core Grant No. ST/G008248/1 Fibre based Op­ti­cal Beam Loss Mon­i­tors (oBLMs) are on-line de­vices used in-situ to mea­sure losses along a beam-line. The tech­nol­ogy is based on the de­tec­tion of Cherenkov ra­di­a­tion, pro­duced in­side quartz fi­bres placed along­side the beampipe, from the in­ter­ac­tion of sec­ondary show­ers gen­er­ated from losses hit­ting the vac­uum pipe. This con­tri­bu­tion pre­sents on­go­ing de­vel­op­ments of an oBLM sys­tem in­stalled along the Com­pact Lin­ear Ac­cel­er­a­tor for Re­search and Ap­pli­ca­tions (CLARA). The oBLM sys­tem con­sists of 4 chan­nels which al­lows for sub-me­tre loss res­o­lu­tion with two di­men­sional cov­er­age along the en­tirety of the beam line, as op­posed to con­ven­tional lo­calised BLM sys­tems. The sys­tem was first com­mis­sioned to mea­sure dark cur­rent from the in­jec­tor. The abil­ity of the sys­tem to lo­cate lon­gi­tu­di­nal po­si­tions of known beam loss lo­ca­tions has also been mea­sured and has shown ex­cel­lent agree­ment. We pre­sent mea­sure­ments ac­quired from the de­tec­tor dur­ing reg­u­lar op­er­a­tion and dur­ing ded­i­cated beam tests. We also dis­cuss the in­cor­po­ra­tion of the mon­i­tor into the ac­cel­er­a­tor di­ag­nos­tics sys­tem and its use in as­sist­ing ac­cel­er­a­tor char­ac­ter­i­sa­tion and per­for­mance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML090
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THPML091	Design of a High Gradient 60 GHz Dielectric Accelerating Structure	4873
SUSPF034	use link to see paper's listing under its alternate paper code
	D.Z. Cao, D. Dan, W. Gai, C.-X. Tang, H. Zha TUB, Beijing, People's Republic of China
	RF break­down are the main lim­i­ta­tion for the ap­pli­ca­tion of high gra­di­ent struc­tures. Higher fre­quen­cies and shorter pulse length ben­e­fit the de­sign of ac­cel­er­at­ing struc­ture for the break­down thresh­old of sur­face field is Es=f1/2 τ-1/4. Power source which gen­er­ates very short V-band pulse with nearly hun­dred megawatt is now avail­able. The paper pre­sents the analy­sis of a V-band di­elec­tric ac­cel­er­a­tion struc­ture and power source. Fu­ture plan about RF trans­mis­sion and power cou­pling of the whole struc­ture will be dis­cussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML091
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THPML092	Electromagnetic and Mechanical Design of High Gradient S-Band Accelerator in TTX	4876
	D.Z. Cao, H.B. Chen, Y. C. Du, W. Gai, W.-H. Huang, J. Shi, C.-X. Tang, P. Wang, H. Zha TUB, Beijing, People's Republic of China
	Thom­son scat­ter­ing x-ray source is an es­sen­tial scien-tific re­search tool in x-ray imag­ing tech­nol­ogy for vari-ous fields. Up­grad­ing plan of re­plac­ing the 3-me­ter S-band linac with a shorter struc­ture op­er­at­ing at higher gra­di­ent in Ts­inghua Thom­son scat­ter­ing X-ray source (TTX) is un­der­go­ing so far, aim­ing to en­hance the ac­cel-er­at­ing gra­di­ent from 15 MV/m to 30 MV/m. De­tailed pa­ra­me­ters of cou­plers and me­chan­i­cal de­sign of ac­celer-ation struc­ture are pre­sented in this work.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML092
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THPML093	New Fast Kicker Results from the Muon g-2 E-989 Experiment at Fermilab	4879
	A.P. Schreckenberger The University of Texas at Austin, Austin, Texas, USA D. Barak, C.C. Jensen, G.E. Krafczyk, R.L. Madrak, H. Nguyen, H. Pfeffer, M. Popovic, J.C. Stapleton, C. Stoughton Fermilab, Batavia, Illinois, USA A.T. Chapelain, A.A. Mikhailichenko, D. L. Rubin Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA N.S. Froemming CENPA, Seattle, Washington, USA J.L. Holzbauer UMiss, University, Mississippi, USA A.I. Keshavarzi The University of Liverpool, Liverpool, United Kingdom
	We de­scribe the in­stal­la­tion, com­mis­sion­ing, and char­ac­ter­i­za­tion of the in­jec­tion kicker sys­tem for the E-989 ex­per­i­ment at Fer­mi­lab for a pre­ci­sion mea­sure­ment of the muon anom­alous mag­netic mo­ment. Con­trol and mon­i­tor­ing sys­tems have been im­ple­mented to ac­quire and record the wave­forms of each kicker pulse, and mea­sure­ments of var­i­ous kicker sys­tem ob­serv­ables were recorded in the pres­ence of the 1.45 T g-2 stor­age ring mag­netic field. These mon­i­tor­ing sys­tems are nec­es­sary to un­der­stand the sys­tem­atic con­tri­bu­tion to the mea­sure­ment of the pre­ces­sion fre­quency. We ex­am­ine the de­pen­dence of muon cap­ture to kicker field pre­dic­tions.
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THPML094	New Methods for Dispersion Measurement and Correction for 12 GeV CEBAF	4882
	D.L. Turner JLab, Newport News, Virginia, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. This paper dis­cusses meth­ods for dis­per­sion mea­sure­ment and cor­rec­tion for the Con­tin­u­ous Elec­tron Beam Ac­cel­er­a­tor Fa­cil­ity (CEBAF) for the 12GeV era. New meth­ods will be com­pared with meth­ods used dur­ing the 6GeV era. New soft­ware tools which im­ple­ment the new meth­ods will be dis­cussed, along with a method for au­tomat­ing dis­per­sion mea­sure­ment and cor­rec­tion. New dis­per­sion mea­sure­ment and cor­rec­tion meth­ods and tools are being im­ple­mented to pro­vide more de­ter­min­is­tic re­sults and to re­duce ma­chine setup time.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML094
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THPML095	Improvement of Wire-Stretching Technique to the RF Measurements of E-Center and Multipole Field for the Dipole Cavities	4885
	G.-T. Park, J. Guo, H. Wang JLab, Newport News, Virginia, USA A. Overstreet ODU, Norfolk, Virginia, USA B. P. Xiaopresenter, T. Xin BNL, Upton, Long Island, New York, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. After the first pub­li­ca­tion* of wire-stretch­ing tech­nique from its prin­ci­ple to mea­sure the elec­tri­cal cen­ter of a de­flect­ing cav­ity, more re­fine­ments of this tech­niques in­clud­ing the re­view of its an­a­lyt­i­cal and sim­u­la­tion re­sults, RF cir­cuit im­prove­ment to im­prove the sig­nal to noise ratio and its ap­pli­ca­tion to other cav­i­ties have been de­vel­oped. These ap­pli­ca­tions in­clude the elec­tri­cal cen­ter mea­sure­ments for the LHC RFD and DQW crab­bing cav­ity pro­to­types, multi-fre­quency har­monic kicker cav­ity for JLEIC elec­tron cooler**, TE011 cav­ity de­vel­oped for the beam mag­ne­ti­za­tion mea­sure­ment***, and a sep­a­ra­tor cav­ity at BNL****. Fur­ther de­vel­op­ment of mea­sure­ment cal­i­bra­tion, error re­duc­tion, align­ment of cav­ity in­stal­la­tion to the ma­chine beam line, and mul­ti­pole field analy­sis for the beam dy­nam­ics will be pre­sented. *H. Wang, Proceedings of NAPAC2016, pp225-228 **S. A. Overstreet, BS Thesis 2017, Guilford College, Greensboro, NC ***J. Guo et al. these proceedings ****T. Xin et al, these proceedings
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THPML096	A Non-Invasive Magnetic Momentum Monitor Using a TE011 Cavity	4889
	J. Guo, J. Henry, M. Poelker, R.A. Rimmerpresenter, R. Suleiman, H. Wang JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC with Laboratory Directed Research and Development funding, under U.S. DOE Contract No. DE-AC05-06OR23177. The Jef­fer­son Lab Elec­tron-Ion Col­lider (JLEIC) de­sign re­lies on cool­ing of the ion beam with bunched elec­tron beam. The bunched beam cooler com­plex con­sists of a high cur­rent mag­ne­tized elec­tron source, an en­ergy re­cov­ery linac, a cir­cu­lat­ing ring, and a pair of long so­le­noids where the cool­ing takes place. A non-in­va­sive real time mon­i­tor­ing sys­tem is highly de­sired to quan­tify elec­tron beam mag­ne­ti­za­tion. The au­thors pro­pose to use a pas­sive cop­per RF cav­ity in TE011 mode as such a mon­i­tor. In this paper, we will show the mech­a­nism and scal­ing law of this de­vice, as well as the de­sign and test­ing re­sults of the pro­to­type cav­ity.
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THPML098	Design of Beam Profile Monitor Used at the Xi'an Proton Application Facility (XiPAF)	4892
	D. Wang, Z.M. Wang State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China W. Chen NINT, Xi'an, People's Republic of China P.F. Mapresenter, Y.G. Yang TUB, Beijing, People's Republic of China W. Wang Tsinghua University, Beijing, People's Republic of China
	A pixel ion­iza­tion cham­ber for beam pro­file mon­i­tor (BPrM) is de­signed and man­u­fac­tured by a new tech­nol­ogy .The de­tec­tor will be in­stalled on the beam line just up­stream of the tar­get de­vice of XiPAF. It has many ad­van­tages such as high res­o­lu­tion, high ra­di­a­tion hard­ness and it can work as a real-time mon­i­tor to show the dis­tri­b­u­tion of the de­liv­ered rel­a­tive dose. The physics de­sign and con­struc­tion of the de­tec­tor are de­scribed in this paper, and its per­for­mances are tested of­fline.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML098
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THPML099	Phase Extraction and Stabilization for Coherent Pulse Stacking	4895
SUSPL060	use link to see paper's listing under its alternate paper code
	Y.L. Xu, W.-H. Huang, C.-X. Tang, L.X. Yan TUB, Beijing, People's Republic of China L.R. Doolittle, Q. Du, G. Huang, W. Leemans, D. Li, R.B. Wilcox, Y. Yang, T. Zhou LBNL, Berkeley, California, USA A. Galvanauskas University of Michigan, Ann Arbor, Michigan, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Contract DE-AC02-05CH11231. Co­her­ent pulse stack­ing (CPS) is a new time-do­main co­her­ent ad­di­tion tech­nique that stacks sev­eral op­ti­cal pulses into a sin­gle out­put pulse, en­abling high pulse en­ergy and high av­er­age power. We model the CPS as a dig­i­tal fil­ter in the Z do­main, and im­ple­ment two de­ter­min­is­tic al­go­rithms ex­tract­ing the cav­ity phase from lim­ited data where only the pulse in­ten­sity is avail­able. In a 2-stage 15-pulse CPS sys­tem, each op­ti­cal cav­ity is sta­bi­lized at an in­di­vid­u­ally-pre­scribed round-trip phase with 0.7 deg and 2.1 deg RMS phase er­rors for Stage 1 and Stage 2 re­spec­tively. Op­ti­cal cav­ity phase con­trol with nm ac­cu­racy en­sures 1.2% in­ten­sity sta­bil­ity of the stacked pulse over 12 hours.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML099
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THPML100	A High Voltage Feedforward Subsystem of Low Level RF System for the High Power RF System	4898
SUSPL062	use link to see paper's listing under its alternate paper code
	Z.Y. Lin, Y. C. Du, H.Q. Fengpresenter, W.-H. Huang, CY. Song, C.-X. Tang, Y.L. Xu, J. Yang TUB, Beijing, People's Republic of China G. Huang LBNL, Berkeley, California, USA
	The Low Level Radio Fre­quency con­trol (LLRF) sys­tem mea­sures the RF sig­nals from the ac­cel­er­a­tor tube, com­pares it with the phase ref­er­ence re­ceived from the tim­ing dis­tri­b­u­tion sys­tem, and pro­vides the drive sig­nal to the high power RF sys­tem to pro­vide syn­chro­nized RF volt­age to the elec­tron beam. Usu­ally, the LLRF sys­tem can achieve a ~50 fs RMS phase jit­ter which is lim­ited by the mi­crowave de­vices. The phase noise arise from the high volt­age vari­a­tion of the high power sys­tem will sig­nif­i­cantly in­crease phase noise from low level RF sig­nal to high power RF. A high volt­age feed for­ward sub­sys­tem is pro­posed to deal with the phase noise caused by the high volt­age jit­ter of the mod­u­la­tor. The demo sys­tem is de­polyed in Thom­son scat­ter­ing X-ray source (TTX).and the pri­mary ex­per­i­ment re­sult anaylse is dis­cussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML100
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THPML101	A Novel Double Sideband-Based Phase Averaging Line for Phase Reference Distribution System	4901
	Z.Y. Lin, Y.-C. Du, W.-H. Huang, Z. Panpresenter, C.-X. Tang, C.-X. Tang, Y.L. Xu, J. Yang TUB, Beijing, People's Republic of China G. Huang LBNL, Berkeley, California, USA
	Coax­ial cable based so­lu­tion is one of the most im­por­tant scheme in Phase Ref­er­ence Dis­tri­b­u­tion Sys­tem. A novel dou­ble side­band-based phase av­er­ag­ing line has been de­vel­oped in Ts­inghua ac­cel­er­a­tor lab. The sender chas­sis gen­er­ates the 2856 MHz sig­nal as the for­ward sig­nal and re­ceives the 2856 MHz sig­nal and the re­flected dou­ble side­band sig­nal from the re­ceiver. The for­ward sig­nal is phase-locked with the ref­er­ence sig­nal, and the for­ward sig­nal and the side­band sig­nal are ad­justed by the FPGA vir­tual delay line. The pre­lim­i­nary ex­per­i­ments re­sult shows the phase sta­bil­ity can achieve about 1% by sig­nal dis­torted by the phase shifter.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML101
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THPML102	Field and Cost Optimization of a 5 T/m Normal Conducting Quadrupole for the 10-MeV Beam Line of the eLINAC of the Mexican Particle Accelerator Community	4905
SUSPL080	use link to see paper's listing under its alternate paper code
	D. Chavez Valenzuela, G.H.I. Maury Cuna, M. Napsuciale Mendivil Universidad de Guanajuato, División de Ciencias e Ingenierías, León, Mexico J. C. Basilio Ortiz CINVESTAV, Mexico City, Mexico P.M. McIntyre, A. Sattarov Texas A&M University, College Station, USA C.A. Valerio ECFM-UAS, Culiacan, Sinaloa, Mexico B. Yee-Rendón KEK, Ibaraki, Japan
	The Mex­i­can Par­ti­cle Ac­cel­er­a­tor Com­mu­nity is cur­rently de­sign­ing the first Mex­i­can RF eLINAC that will have three beam­lines at 10, 60 and 100 MeV. In this work, we pre­sent an op­ti­mized de­sign in terms of field qual­ity and pro­duc­tion cost for the 5 T/m nor­mal con­duct­ing quadrupoles of the 10-MeV beam­line. Sev­eral can­di­date ma­te­ri­als for the yoke were stud­ied based on their avail­abil­ity and machin­abil­ity, with the aim to op­ti­mize in-house pro­duc­tion cost (Mex­ico) while re­strict­ing a low mul­ti­pole con­tent.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML102
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THPML106	Electron Microscopy Inspired Setup for Single-Shot 4-D Trace Space Reconstruction of Bright Electron Beams	4909
	J. Giner Navarro, D.B. Cesarpresenter, P. Musumeci UCLA, Los Angeles, California, USA R.W. Aßmann, B. Marchetti, D. Marx DESY, Hamburg, Germany
	Funding: This work has been partially supported by the National Science Foundation under Grant No. 1549132 and Department of Energy under award No. DE-SC0009914. In the de­vel­op­ment of low charge, sin­gle-shot di­ag­nos­tics for high bright­ness elec­tron beams, Trans­mis­sion Elec­tron Mi­croscopy (TEM) grids pre­sent cer­tain ad­van­tages com­pared to pep­per pot masks due to higher beam trans­mis­sion. In this paper, we de­vel­oped a set of cri­te­ria to op­ti­mize the res­o­lu­tion of a point pro­jec­tion image. How­ever, this con­fig­u­ra­tion of the beam with re­spect to the grid and de­tec­tor po­si­tions im­plies the mea­sure­ment of a strongly cor­re­lated phase space which en­tails a large sen­si­tiv­ity to small mea­sure­ment er­rors in re­triev­ing the pro­jected emit­tance. We dis­cuss the pos­si­bil­ity of an al­ter­na­tive scheme by in­sert­ing a mag­netic fo­cus­ing sys­tem in be­tween the grid and the de­tec­tor, sim­i­lar to an elec­tron mi­cro­scope de­sign, to re­con­struct the phase space when the beam is fo­cused on the grid.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML106
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THPML107	Steering Optimizations for the University of Maryland Electron Ring	4913
SUSPL053	use link to see paper's listing under its alternate paper code
	L. Dovlatyan, B.L. Beaudoin, R.A. Kishek, K.J. Ruisard UMD, College Park, Maryland, USA
	Funding: This work is supported by the US Dept. of Energy, Office of High Energy Physics award # DE-SC0010301 The Uni­ver­sity of Mary­land Elec­tron Ring (UMER) has the flex­i­bil­ity to set up al­ter­na­tive lat­tices for dif­fer­ent re­search ex­per­i­ments, in­clud­ing non­lin­ear op­tics stud­ies using oc­tupoles. Each al­ter­na­tive lat­tice re­quires an ac­cept­able steer­ing so­lu­tion for use in ex­per­i­ments. Ex­ist­ing beam-based align­ment tools can take a sig­nif­i­cant amount of time to run and be­come dif­fi­cult to process with a low num­ber of BPMs. The Ro­bust Con­ju­gate Di­rec­tional Search (RCDS) op­ti­mizer* is used to quickly ob­tain steer­ing so­lu­tions for dif­fer­ent lat­tice con­fig­u­ra­tions and has been adopted for beam steer­ing at UMER. Steer­ing mag­nets are op­ti­mized on­line to re­duce scrap­ing, cor­rect equi­lib­rium or­bits, and in­crease beam life­times. This study pre­sents the ap­pli­ca­tion of the op­ti­mizer at UMER. * X. Huang, J. Corbett, J. Safranek, J. Wu, Nucl. Instr. Meth. A vol. 726, pp. 77-83, 2013.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML107
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THPML108	Distributed I/O System Based on Ethernet POWERLINK Under the EPICS Architecture	4917
SUSPL055	use link to see paper's listing under its alternate paper code
	X.K. Sun, G. Liu, Y. Song USTC/NSRL, Hefei, Anhui, People's Republic of China
	Eth­er­net POW­ER­LINK (EPL) is a com­mu­ni­ca­tion pro­file for Real-Time Eth­er­net. The com­mu­ni­ca­tion pro­file meets real-time de­mands for the dis­trib­uted sys­tem com­posed of mul­ti­ple con­trollers. EPICS is a wildly used dis­trib­uted con­trol sys­tem in large sci­en­tific fa­cil­i­ties. We de­sign a dis­trib­uted IO sys­tem based on EPL under the EPICS ar­chi­tec­ture and es­tab­lish the pro­to­type sys­tem com­posed of a PC and six FPGA boards. In this sys­tem, an EPICS dri­ver based on open­POW­ER­LINK is de­vel­oped to mon­i­tor the sys­tem sta­tus. In this paper, the com­mu­ni­ca­tion mech­a­nism of EPL, the de­sign of sys­tem ar­chi­tec­ture, the im­ple­men­ta­tion of EPICS dri­ver and the test re­sults of pro­to­type sys­tem will be de­scribed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML108
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THPML109	Control System Design for Front End Devices of IRFEL	4920
	S. Xu, G. Liu, Y. Song, X.K. Sunpresenter USTC/NSRL, Hefei, Anhui, People's Republic of China
	An In­frared Free Elec­tron Laser Light (IRFEL) is being con­structed at Na­tional Syn­chro­tron Ra­di­a­tion Lab­o­ra­tory. IRFEL con­sists of e-gun, ac­cel­er­at­ing tube, mi­crowave, kly­stron, power sup­ply, vac­uum, res­onator, un­du­la­tor, beam di­ag­no­sis, cool­ing water and other de­vices. The de­vel­op­ment of the con­trol sys­tem for the front end de­vices of IRFEL is based on EPICS. This paper will in­tro­duce the hard­ware sys­tem de­sign, Input Out­put Con­troller ap­pli­ca­tion, Op­er­a­tion In­ter­face, data archiv­ing and re­trieval.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML109
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THPML110	EPICS Driver for Siemens CP1616 Communication Module	4923
	Z. Huang, G. Liu, Y. Song, X.K. Sunpresenter USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China (11375186) Siemens com­mu­ni­ca­tion mod­ule CP1616 is a high-per­for­mance PROFINET con­troller, which can sup­port both Real-time (RT) and Isochro­nous Real-Time (IRT) com­mu­ni­ca­tion. Ex­per­i­men­tal Physics and In­dus­trial Con­trol Sys­tem (EPICS) is a wildly used dis­trib­uted con­trol sys­tem in large sci­en­tific de­vices. In order to in­te­grate PROFINET pro­to­col into EPICS en­vi­ron­ment, we de­vel­oped this dri­ver based on CP1616 and es­tab­lished the pro­to­type sys­tem. This paper will de­scribe the de­sign of EPICS dri­ver for CP1616 and the test re­sult of the pro­to­type sys­tem.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML110
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THPML111	Test of the Tune Measurement System Based on BBQ at HLS-II Storage Ring	4926
	L.T. Huang, F.L. Gao, P. Lu, B.G. Sun, H.Q. Wang, J.G. Wang, Q. Wang, F.F. Wu, Y.L. Yangpresenter, T.Y. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by the National Science Foundation of China (Grant No. 11705203, 11575181) The HLS-II stor­age ring is a cru­cial part of Hefei Light Source. Tune is one of the most im­por­tant pa­ra­me­ters of the elec­tron stor­age ring, of which the tune mea­sure­ment sys­tem is an in­te­gral com­po­nent. In this paper, the de­sign of a new tune mea­sure­ment sys­tem based on BBQ (base band tune), is pre­sented. Some ex­per­i­ments are per­formed to test this sys­tem. The new sys­tem is com­pared with the orig­i­nal sys­tem and the TBT (turn-by-turn) method re­spec­tively. The ob­tained re­sults il­lus­trate higher ac­cu­racy and higher sta­bil­ity for the new sys­tem. A new ap­proach of cal­cu­lat­ing the be­ta­tron os­cil­la­tion am­pli­tude is pro­posed, and the be­ta­tron os­cil­la­tion am­pli­tudes in the nor­mal run­ning stage for the HLS-II stor­age ring are es­ti­mated at 95 nm (hor­i­zon­tal) and 60 nm (ver­ti­cal).
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THPML112	Preliminary Design and Calculation of Button BPM for the HALS Storage Ring	4929
	F.F. Wu, F.L. Gao, L.T. Huang, X.Y. Liu, P. Lu, B.G. Sun, J.H. Wei, Y.L. Yangpresenter, T.Y. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China L. Lin Huizhou University, Huizhou, People's Republic of China
	Funding: Supported by the National Science Foundation of China (Grant No.11705203, 11575181，11605202) and the National Key Research and Development Program of China(No. 2016YFA0402000) But­ton BPM is being de­signed for the HALS stor­age ring, which is a dif­frac­tion-lim­ited stor­age ring (DLSR) lo­cated at the NSRL in Hefei city. Since beam size is very small, the re­quired res­o­lu­tion of 50 nm for beam po­si­tion mea­sure­ment need to be ob­tained. The pa­ra­me­ters of the HALS But­ton BPM are ini­tially de­ter­mined. Ac­cord­ing to the­o­ret­i­cal for­mu­las, elec­trode in­duced sig­nal is cal­cu­lated and the re­la­tion­ship be­tween elec­trode in­duced sig­nal and beam cur­rent is ob­tained. Sig­nal to noise ratio(SNR)of the HALS But­ton BPM is cal­cu­lated with dif­fer­ent beam cur­rent when the re­quired res­o­lu­tion is 50 nm. The re­sults show that the SNR is well when beam cur­rent is very low. In ad­di­tion, the ef­fects of BPM RF fre­quency and but­ton elec­trode ra­dius on SNR are an­a­lyzed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML112
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THPML113	Design and Simulation of the Waveguide Coupler for the Cavity Beam Monitor	4932
	Q. Wang, Q. Luo, B.G. Sun, F.F. Wu, Y.L. Yangpresenter, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China Y.W. Wu USTC, Hefei, Anhui, People's Republic of China
	Funding: Supported by The National Key Research and Development Program of China (2016YFA0401900), NSFC (11375178, 11575181) and the Fundamental Research Funds for the Central Universities (WK2310000046) The wave­guide cou­pling is an im­por­tant way to ex­tract the sig­nals of the spe­cific eigen­modes re­quired. The de­sign of the wave­guide cou­pler, in­clud­ing the wave­guide-to-coax­ial adapter be­hind it for the cav­ity bunch length mon­i­tor is pre­sented. The in­flu­ence of the di­men­sion pa­ra­me­ters is an­a­lyzed, which of­fers the the­o­ret­i­cal sup­port for the de­sign and ap­pli­ca­tion of cav­ity bunch length mon­i­tor or cav­ity beam po­si­tion mon­i­tor (CBPM). A se­ries sim­u­la­tion based on CST is per­formed to ver­ify the fea­si­bil­ity, and the sim­u­la­tion re­sults show good per­for­mance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML113
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THPML115	Introduction of the Laser Intensity Measurement System for the FELiChEM	4936
	F.L. Gao, L.T. Huang, P. Lu, B.G. Sun, J.G. Wang, F.F. Wu, Y.L. Yangpresenter, T.Y. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	The FE­LiChEM is a new in­frared free elec­tron laser (IR-FEL) fa­cil­ity, which is being built in the Na­tional Syn­chro­tron Ra­di­a­tion Lab­o­ra­tory (NSRL) in Heifei, China. The fa­cil­ity will pro­vide con­tin­u­ously tun­able pulsed laser ra­di­a­tion cov­er­ing the mid-in­frared (MIR) wave­length range from 2.5 to 50μm and the far-in­frared (FIR) range from 40 to 200μm. The out­put macro pulsed laser width is 5-10μs and pulsed laser power is 2-10kW. In order to eval­u­ate pulsed laser sat­u­ra­tion time and FEL op­ti­cal cav­ity losses, the rise time and fall time of macro pulsed laser need to be mea­sured. Laser in­ten­sity mea­sure­ment sys­tem for the FE­LiChEM is being de­signed. This sys­tem is com­posed of op­ti­cal sys­tem, py­ro­elec­tric de­tec­tor and elec­tron­ics. Each mod­ule will be de­scribed in de­tail in this paper. The laser in­ten­sity mea­sure­ment sys­tem was tested under of­fline and on­line con­di­tions. The re­sults showed that pulsed laser of 10μs width can be mea­sured and the de­sign re­quire­ment can be met with this sys­tem.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML115
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THPML116	AutoTuner: A General Graphical User Interface for Automated Tuning	4939
	X. Huang SLAC, Menlo Park, California, USA T. Zhangpresenter USTC/NSRL, Hefei, Anhui, People's Republic of China
	Au­to­Tuner is a gen­eral graph­i­cal user in­ter­face (GUI) that we de­vel­oped for au­to­mated tun­ing or on­line op­ti­miza­tion. The GUI pro­vides a con­ve­nient in­ter­face to se­lect tun­ing knobs, ob­jec­tives, and op­ti­miza­tion al­go­rithms and to change the tun­ing con­trol pa­ra­me­ters. Tun­ing setup can be cre­ated and saved for reuse. The progress of the tun­ing pro­cess­ing is plot­ted in real time. The tun­ing process can be paused, aborted, or re­sumed. We have tested the pro­gram for real-life ac­cel­er­a­tor tun­ing prob­lems.
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THPML117	Study of the Impact of Linear Coupling on Off-Axis Injection	4943
	X. Huang SLAC, Menlo Park, California, USA T. Zhangpresenter USTC/NSRL, Hefei, Anhui, People's Republic of China
	The next gen­er­a­tion of stor­age ring light sources will likely op­er­ate with high lin­ear cou­pling, which could po­ten­tially pre­vent the use of off-axis in­jec­tion as large hor­i­zon­tal os­cil­la­tion of the in­jected beam is cou­pled to the ver­ti­cal plane. We did ex­per­i­ments on the SPEAR3 stor­age ring to study how lin­ear cou­pling im­pact the dy­namic aper­ture and the off-axis in­jec­tion ef­fi­ciency. The re­sults show that the dy­namic aper­ture is sig­nif­i­cantly re­duced and in­jec­tion ef­fi­ciency can drop to zero when op­er­ated on the cou­pling res­o­nance. How­ever, with large non­lin­ear de­tun­ing, the dy­namic aper­ture and high in­jec­tion ef­fi­ciency can sur­vive with the stored beam at full cou­pling be­cause the in­jected beam is shifted away from the cou­pling res­o­nance.
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THPML118	The AWAKE Electron Spectrometer	4947
	F. Keeble, M. Cascella, J. A. Chappell, L.C. Deacon, S. Jolly, M. Wing UCL, London, United Kingdom I. Gorgisyan, S. Mazzoni CERN, Geneva, Switzerland P.L. Penna, M. Quattri ESO, Garching bei Muenchen, Germany
	The AWAKE ex­per­i­ment at CERN aims to use a pro­ton dri­ven plasma wake­field to ac­cel­er­ate elec­trons from 10–20 MeV up to GeV en­er­gies in a 10 m plasma cell. We pre­sent the de­sign of the mag­netic spec­trom­e­ter which will mea­sure the elec­tron en­ergy dis­tri­b­u­tion. Re­sults from the cal­i­bra­tion of the spec­trom­e­ter's scin­til­la­tor and op­ti­cal sys­tem are pre­sented, along with a study of the back­grounds gen­er­ated by the 400 GeV SPS pro­ton beam.
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THPML119	A Time-of-Flight Based Energy Measurement System for the LIGHT Medical Accelerator	4951
SUSPF096	use link to see paper's listing under its alternate paper code
	F. Galizzi University of Bergamo, Bergamo, Italy M. Caldara, F. Galizzi, A. Jeff A.D.A.M. SA, Meyrin, Switzerland
	The LIGHT pro­ton ther­apy fa­cil­ity is the first com­pact Linac that will de­liver pro­ton beams up to 230 MeV for can­cer treat­ment. The pro­ton beam is pulsed; pulses rep­e­ti­tion rate can reach 200 Hz. LIGHT pro­to­type is cur­rently being com­mis­sioned by AVO/ADAM at CERN, while the first full in­stal­la­tion is fore­seen in 2019. Beam en­ergy trans­lates di­rectly to range pen­e­tra­tion in the body, so it is of the ut­most im­por­tance to mon­i­tor it ac­cu­rately es­pe­cially for Linacs, since each beam pulse is di­rectly trans­ported to the pa­tient. We pre­sent the im­ple­men­ta­tion of a non-in­ter­cep­tive beam en­ergy mea­sure­ment sys­tem based on the Time-of-Flight tech­nique. Un­like state of the art ToF sys­tems this one has been de­signed to mea­sure au­tonomously the mean en­ergy of the beam with med­ical res­o­lu­tion (0.03 %) by pro­cess­ing as lit­tle as 1 us of data pro­vid­ing the re­sult within 1 to 2 ms over an en­ergy range from 5 to 230 MeV. The first re­sults for beams up to 7.5 MeV are shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML119
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THPML120	Development of Coating Technique for Superconducting Multilayered Structure	4954
	R. Ito, T. Nagata ULVAC, Inc, Chiba, Japan H. Hayano, T. Kubo, T. Saeki KEK, Ibaraki, Japan H. Ito Sokendai, Ibaraki, Japan Y. Iwashita, R. Katayama Kyoto ICR, Uji, Kyoto, Japan H. Oikawa Utsunomiya University, Utsunomiya, Japan
	In order to in­crease the max­i­mum ac­cel­er­a­tion gra­di­ent of SRF cav­i­ties, S-I-S (su­per­con­duc­tor-in­su­la­tor-su­per­con­duc­tor) mul­ti­lay­ered struc­ture the­ory has been pro­posed. We fo­cused on NbN which has a higher su­per­con­duct­ing tran­si­tion tem­per­a­ture than Nb. Firstly, we re­searched the op­ti­mal de­po­si­tion con­di­tion for N2 gas re­ac­tive sput­ter­ing of NbN by using in-house in­ter-back type DC mag­netron sput­ter­ing equip­ment. The crit­i­cal con­di­tion for a thin film with strong crys­talline ori­en­ta­tion of NbN was iden­ti­fied. The su­per­con­duct­ing tran­si­tion tem­per­a­ture of the NbN thin film, which were coated under the best con­di­tion, was over 14 K. Sec­ondly, we tried mak­ing S-I-S mul­ti­lay­ered sam­ples that was com­posed of NbN/SiO2/Nb sub­strate. The coat­ing con­di­tion for the NbN layer was de­ter­mined based on the re­search re­sults in a sin­gle layer. The SiO2 layer was de­posited with a film thick­ness of 30 nm that was the­o­ret­i­cally ex­pected to be ef­fec­tive as bar­rier layer. We ap­plied O2 gas re­ac­tive AC mag­netron sput­ter­ing for coat­ing. In this ar­ti­cle, the de­tailed re­sults of the NbN sin­gle layer and mul­ti­layer film de­po­si­tions are pre­sented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML120
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THPML121	Compensation of Transient Beam Loading in Ramping Synchrotrons Using a Fixed Frequency Processing Clock	4957
SUSPL061	use link to see paper's listing under its alternate paper code
	F.J. Galindo Guarch, J.M.M.A. Moreno Arostegui Universitat Politécnica de Catalunya, Barcelona, Spain P. Baudrenghien, F.J. Galindo Guarch CERN, Geneva, Switzerland
	Tran­sient beam load­ing com­pen­sa­tion schemes, such as One-Turn-Feed­Back (OTFB), re­quire beam syn­chro­nous pro­cess­ing (BSP). Swept clocks de­rived from the RF, and there­fore har­monic to the rev­o­lu­tion fre­quency, are widely used in CERN syn­chro­trons; this sim­pli­fies im­ple­men­ta­tion with en­ergy ramp­ing, where the rev­o­lu­tion fre­quency changes. It is how­ever not op­ti­mal for state-of-the-art dig­i­tal hard­ware that prefers fixed fre­quency clocks. An al­ter­na­tive to the swept clock­ing is the use of a de­ter­min­is­tic pro­to­col, for ex­am­ple, White Rab­bit (WR): a fixed ref­er­ence clock can be ex­tracted from its data stream, while en­abling dig­i­tal dis­tri­b­u­tion of the RF fre­quency among other data. New al­go­rithms must be de­vel­oped for BSP using this fixed clock and the dig­i­tal data trans­mit­ted on the WR link. This is the strat­egy adopted for the SPS Low Level RF (LLRF) up­grade. The paper gives an overview of the tech­ni­cal, tech­no­log­i­cal and his­tor­i­cal mo­ti­va­tions for such a par­a­digm evo­lu­tion. It lists the prob­lems of fixed clock BSP, and pre­sents an in­no­v­a­tive so­lu­tion based on a real-time vari­able ratio re-sam­pler for im­ple­ment­ing an OTFB with the new fixed clock scheme.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML121
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THPML122	Beta-SRF - A New Facility to Characterize SRF Materials near Fundamental Limits	4961
SUSPL077	use link to see paper's listing under its alternate paper code
	E. Thoeng UBC & TRIUMF, Vancouver, British Columbia, Canada R.A. Baartman, R.E. Laxdal, B. Matheson, G. Morris, N. Muller, S. Saminathan TRIUMF, Vancouver, Canada A. Chen UBC, Vancouver, Canada T. Junginger Lancaster University, Lancaster, United Kingdom
	Funding: Natural Sciences and Engineering Research Council of Canada (NSERC) & UBC (NSERC) IsoSiM Program De­mands of CW high-power LINAC re­quire SRF cav­i­ties op­er­at­ing at the fron­tier of high ac­cel­er­at­ing gra­di­ent and low RF power dis­si­pa­tion, i.e. high qual­ity fac­tor (Q0). This re­quire­ment poses a chal­lenge for stan­dard sur­face treat­ment recipes of SRF cav­i­ties. In a re­cent break­through, el­lip­ti­cal SRF cav­i­ties doped with Ni­tro­gen have been shown to im­prove Q0 by a fac­tor of 3, close to the fun­da­men­tal SRF limit. The fun­da­men­tal mech­a­nisms at mi­cro­scopic level and op­ti­mum dop­ing recipe, how­ever, have still not fully been un­der­stood. Ma­te­ri­als other than Nb have also been pro­posed for SRF cav­i­ties to over­come the fun­da­men­tal limit al­ready reached with Ni­tro­gen dop­ing, e.g. Nb3Sn, MgB2, and Nb-SIS mul­ti­layer. At TRI­UMF, a unique ex­per­i­men­tal fa­cil­ity is cur­rently being de­vel­oped to ad­dress these is­sues. This fa­cil­ity will be able to probe local sur­face mag­netic field in the order of the Lon­don Pen­e­tra­tion Depth (sev­eral tens of nm) via \beta decay de­tec­tion of a low-en­ergy ra­dioac­tive ion-beam. This al­lows depth-res­o­lu­tion and layer-by-layer mea­sure­ment of mag­netic field shield­ing ef­fec­tive­ness of dif­fer­ent SRF ma­te­ri­als at high-par­al­lel field (up to 200 mT). De­sign and cur­rent de­vel­op­ment of this fa­cil­ity will be pre­sented here, as well as com­mis­sion­ing and fu­ture mea­sure­ments strate­gies for new SRF ma­te­ri­als.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML122
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THPML123	The ESR Barrier-Bucket LLRF System - Design and First Results	4964
	J. Harzheim, D. Domont-Yankulova, K. Groß, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany M. Frey, H. Klingbeil, D.E.M. Lens GSI, Darmstadt, Germany
	At GSI, Darm­stadt, Ger­many, a Bar­rier-Bucket (BB) RF Sys­tem is cur­rently under de­vel­op­ment for the Ex­per­i­men­tal Stor­age Ring (ESR). The sys­tem con­sists of two broad­band RF cav­i­ties, each dri­ven by a solid state am­pli­fier, with the pur­pose to pro­duce two volt­age pulses per beam rev­o­lu­tion. This will en­able highly so­phis­ti­cated lon­gi­tu­di­nal beam ma­nip­u­la­tions like lon­gi­tu­di­nal cap­ture, com­pres­sion and de­com­pres­sion or stack­ing of the beam. For the LLRF Sys­tem, sev­eral re­quire­ments have to be ful­filled. Be­sides high stan­dards con­cern­ing the pulsed gap sig­nal qual­ity (e.g. ring­ing <2.5%), the sys­tem has to pro­vide the flex­i­bil­ity for adi­a­batic volt­age ramp-up and adi­a­batic pulse shift­ing with high tim­ing ac­cu­racy. A con­nec­tion to the FAIR Cen­tral Con­trol Sys­tem (CCS) is nec­es­sary, as am­pli­tude and phase ramp data will be pro­vided by the CCS. In this con­tri­bu­tion, the struc­ture of the ESR BB LLRF sys­tem is pre­sented to­gether with ex­per­i­men­tal re­sults from the first ver­sion of the sys­tem, which will be in­stalled in the ESR in March 2018.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML123
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THPML124	Design of Beam Position Fast-Correction Magnet Power Supply for HALS	4967
SUSPL082	use link to see paper's listing under its alternate paper code
	Z.X. Shao, H. Gao, L. Wang, H.Y. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by 'Hefei Advanced Light Source Pre-research Project' Hefei Ad­vanced Light Source (HALS) is the fourth-gen­er­a­tion ra­di­a­tion light source that is being pre-re­searched in China. Ul­tra-low emit­tance of the beam re­quires higher per­for­mance of power sup­ply sys­tem. We de­signed a fast cor­rect­ing power sup­ply for the beam mea­sure­ment needs. We adopted the all-dig­i­tal method, the cur­rent closed-loop feed­back used the AD7766 with 24-bit res­o­lu­tion as its A/D con­verter. And we added the cor­re­spond­ing con­stant tem­per­a­ture con­trol, chain pro­tec­tion, etc. The small-sig­nal fre­quency re­sponse of this sys­tem can reach more than 5kHz. The de­tail de­sign scheme is de­scribed in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML124
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THPML125	Efficiency Analysis of High Average Power Linacs for Environmental and Industrial Applications	4970
	M. Shumail, V.A. Dolgashev SLAC, Menlo Park, California, USA
	Funding: U.S. Department of Energy, HEP under Research Opportunities in Accelerator Stewardship: LAB 16-1438. We pre­sent com­pre­hen­sive ef­fi­ciency equa­tions and use­ful scal­ing laws to op­ti­mally de­ter­mine de­sign pa­ra­me­ters for high ef­fi­ciency rf linacs. For the first time we have in­cor­po­rated the par­a­sitic losses due to the higher order cav­ity modes into the ef­fi­ciency analy­sis of the stand­ing wave (SW) and trav­el­ling wave (TW) ac­cel­er­a­tors. We have also de­rived the ef­fi­ciency equa­tions for a new kind of at­ten­u­a­tion-in­de­pen­dent-im­ped­ance trav­el­ling wave (ATW) ac­cel­er­a­tors where the shunt im­ped­ance can be op­ti­mized in­de­pen­dent of the group ve­loc­ity. We have ob­tained scal­ing laws which re­late the rf to beam ef­fi­ciency to the linac length, beam aper­ture ra­dius , phase ad­vance per cell, and the type of ac­cel­er­at­ing struc­ture: SW ver­sus TW, disk-loaded (DL) ver­sus nose-cone (NC). We give an ex­am­ple of using these scal­ing laws to de­ter­mine a fea­si­ble set of pa­ra­me­ters for a 10 MeV, 10 MW linac with 97.2% ef­fi­ciency.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML125
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THPML126	Design of High Efficiency High Power CW Linacs for Environmental and Industrial Applications	4974
	M. Shumail, V.A. Dolgashev, C.M. Markusen SLAC, Menlo Park, California, USA
	Funding: US Department of Energy, Office of High Energy Physics, through Accelerator Stewardship Grant We have used our ac­cel­er­a­tor de­sign tool­box equa­tions to de­sign three high ef­fi­ciency and high power CW ac­cel­er­a­tors for the en­vi­ron­men­tal and med­ical ap­pli­ca­tions. These are: 2MeV-1MW, 10MeV-10MW, and 10MeV-1MW linacs. These are all 10 m long, 1.3 GHz, π-mode stand­ing wave struc­tures with de­sign ef­fi­cien­cies of 96.8, 97.4 and 86.5 %, and op­ti­mal cou­pling co­ef­fi­cients of 32.9, 43.5, and 7.45, re­spec­tively. We pre­sent the de­tailed de­sign pa­ra­me­ters of these linacs. The study of sin­gle-bunch beam breakup for these linacs and the sim­u­la­tions re­sults from ABCI are also in­cluded. The ini­tial cav­i­ties are op­ti­mized ac­cord­ing to the speed of the elec­tron bunch to max­i­mize the shunt im­ped­ance. The plots of peak sur­face fields on these cav­i­ties are also pre­sented. We have also in­cluded a de­tailed ther­mal analy­sis of these linacs. Fi­nally, we pre­sent the re­sults of ASTRA sim­u­la­tions of the three linacs with mag­netic fo­cus­ing. We have also in­cluded the com­plete de­sign of rf-dis­trib­uted-cou­pling man­i­fold for the third linac along with the HFSS® sim­u­la­tion re­sults.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML126
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THPML127	Alignment and Installation for the FELiChEM project	4977
	W. Wang, Zhang, H.T. H.T, X.Y. He, D.R. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by National Natural Science Foundation of China (11705199) and China Postdoctoral Science Foundation (2017M622024) FE­LiChEM is a new ex­per­i­men­tal fa­cil­ity under con­struc­tion at the Uni­ver­sity of Sci­ence and Tech­nol­ogy of China. There are more than one hun­dred im­por­tant de­vices to con­struct it, which core de­vice is two free elec­tron laser os­cil­la­tors gen­er­at­ing mid­dle-in­frared and far-in­frared laser and cov­er­ing the spec­tral range of 25-200μm. The op­ti­cal cav­ity is an im­por­tant com­po­nent of os­cil­la­tor which very sen­si­tive to mis­align­ment er­rors of the mir­ror, due to its near-con­cen­tric and sym­met­ric struc­ture. High pre­ci­sion align­ment and in­stal­la­tion is nec­es­sary to en­sure the smooth im­ple­men­ta­tion of the FE­LiChEM pro­ject. Laser tracker and Level are used to in­stall this de­vices ac­cord­ing to the align­ment con­trol net­work. An ef­fi­cient and high-pre­ci­sion align­ment method based on au­to­col­li­ma­tor and pho­to­elec­tric auto-col­li­ma­tor is used to align op­ti­cal cav­ity of os­cil­la­tor. This meth­ods is proven to be ef­fec­tive and meet the tol­er­ances by mul­ti­ple means.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML127
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THPML128	Production and Secondary Electron Yield Test of Amorphous Carbon Thin Film	4980
	Y.X. Zhang, X.Q. Ge, S.W. Wangpresenter, Y. Wang, W. Wei, B. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Amor­phous car­bon (a-C) thin film ap­plied to vac­uum cham­bers of high-en­ergy par­ti­cle ac­cel­er­a­tors can de­crease sec­ondary elec­tron yield（SEY）and sup­press elec­tron-cloud ef­fec­tively. A dc mag­netron sput­ter­ing ap­pa­ra­tus to ob­tain a-C film has been de­signed. With the equip­ment, a-C thin film can be de­posited on the inner face of stain­less steel pipes ul­ti­mately which is uni­form and high-qual­ity. Mean­while, it is found that a-C has a low SEY＜1.2 mea­sured by the sec­ondary elec­tron emis­sion mea­sure­ment set-up in the Na­tional Syn­chro­tron Ra­di­a­tion Lab­o­ra­tory. The re­sult in­di­cates that a-C is an ideal ma­te­r­ial for mod­ern ac­cel­er­a­tors.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML128
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THPML129	Deposition and Characterization of TiZrHfV films by DC Magnetron Sputtering	4983
	X.Q. Ge, T.L. Hepresenter, X.T. Pei, Y.G. Wang, Y. Wang, W. Wei, B. Zhang, Y.X. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	The new gen­er­a­tion of ac­cel­er­a­tors places higher de­mands on the sur­faces of vac­uum cham­ber ma­te­ri­als. Search for low sec­ondary elec­tron yield (SEY) ma­te­ri­als and an ef­fec­tive vac­uum cham­ber sur­face treat­ment process, which can ef­fec­tively re­duce the elec­tronic cloud ef­fect, are im­por­tant early works for the new gen­er­a­tion of ac­cel­er­a­tors. In this work, we re­vealed the SEY char­ac­ter­is­tics of Ti-Zr-Hf-V NEG films and Ti-Zr-V NEG films which were de­posited on Si (111) sub­strates using di­rect cur­rent mag­netron sput­ter­ing method. The sur­face mor­phol­ogy and sur­face chem­i­cal bond­ing in­for­ma­tion were col­lected by scan­ning elec­tron mi­croscopy (SEM) and X-ray pho­to­elec­tron spec­troscopy (XPS). With the same pa­ra­me­ters, the max­i­mum SEY of Ti-Zr-Hf-V NEG films and Ti-Zr-V NEG films are 1.24 and 1.51, re­spec­tively. These re­sults are of great sig­nif­i­cance for the next-gen­er­a­tion par­ti­cle ac­cel­er­a­tors.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML129
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THPML130	Applications of a Distributed Beam Loss Monitor at the Australian Synchrotron	4986
SUSPF097	use link to see paper's listing under its alternate paper code
	P.J. Giansiracusa, T.G. Lucas, R.P. Rassool, M. Volpi The University of Melbourne, Melbourne, Victoria, Australia M.J. Boland CLS, Saskatoon, Saskatchewan, Canada G. LeBlanc SLSA, Clayton, Australia
	A dis­trib­uted beam loss mon­i­tor­ing sys­tem, based on Cherenkov sil­ica fi­bres, has been in­stalled at the Aus­tralian Syn­chro­tron. The fi­bres are in­stalled par­al­lel to the beam pipe and cover the ma­jor­ity of the in­jec­tion sys­tem and stor­age ring. Rel­a­tivis­tic charged par­ti­cles from beam loss events that have a ve­loc­ity above the Cherenkov thresh­old pro­duce pho­tons in the fi­bres. These pho­tons are then guided along the fi­bres to de­tec­tors out­side of the ac­cel­er­a­tor tun­nels. Orig­i­nally the sys­tem was in­stalled to de­ter­mine its suit­abil­ity for mea­sur­ing losses at a fu­ture lin­ear col­lider, such as the Com­pact Lin­ear Col­lider, with sin­gle pass 150 ns bunch trains. This study builds on these re­sults and at­tempts to use the sys­tem to mea­sure loss lo­ca­tions with a cir­cu­lat­ing beam. We pre­sent the pre­lim­i­nary re­sults and de­scribe how the sys­tem could be im­proved.
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THPML131	A NEW PRODUCTION PROCESS FOR UCx TARGETS FOR RADIOACTIVE ISOTOPE BEAMS AT TRIUMF	4990
SUSPL087	use link to see paper's listing under its alternate paper code
	M. S. Cervantes, P. Fouquet-Métivier, A. Gottberg, P. Kunz, L. Lambert, A. Mjøs, J. Wong TRIUMF, Vancouver, Canada M. S. Cervantes UVIC, Victoria, Canada P. Fouquet-Métivier ENSCM, Montpellier, France A. Gottberg Victoria University, Victoria, B.C., Canada
	TRI­UMF has the ob­jec­tive of pro­duc­ing ra­dioac­tive iso­tope beams (RIB) using the ISOL method. Ra­dioac­tive iso­topes are used in ex­per­i­ments in dif­fer­ent areas of sci­ence. At the TRI­UMF-ISAC fa­cil­ity, a 500 MeV pro­ton dri­ver beam im­pinges onto dif­fer­ent tar­gets and in­duces nu­clear re­ac­tions in them. The iso­topes ob­tained in this way then dif­fuse out of the tar­get ma­te­r­ial be­fore they are ion­ized and ex­tracted to form an iso­tope beam. Tar­gets of ura­nium car­bide with ex­cess of graphite (UCx) are the most re­quested tar­gets at TRI­UMF. ARIEL, TRI­UMF's flag­ship pro­ject, aims at in­creas­ing the ra­dioac­tive iso­tope pro­duc­tion ca­pa­bil­i­ties to sat­isfy the grow­ing de­mand of ra­dioac­tive iso­topes. The cur­rent pro­duc­tion method of UCx targest does not have the means to sup­ply enough UCx tar­gets to sat­isfy ARIEL's de­mand, there­fore, a new method for ef­fi­cient UCx tar­get ma­te­r­ial syn­the­sis is being de­vel­oped.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML131
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THPML132	Cryogenic Performance of an SRF Deflecting Cavity Fabricated Using Alternative Techniques for the ARIEL eLinac	4992
	D.W. Storey Victoria University, Victoria, B.C., Canada R.E. Laxdal, Z.Y. Yaopresenter TRIUMF, Vancouver, Canada
	A 650 MHz SRF de­flect­ing mode cav­ity has been built and tested for use as a three-way beam sep­a­ra­tor in the ARIEL eLinac. The cav­ity op­er­ates in a TE-like mode, and has been op­ti­mized for high shunt im­ped­ance with min­i­mal lon­gi­tu­di­nal foot­print. The de­vice is the first SRF cav­ity to be fully fab­ri­cated in house at TRI­UMF. The re­quire­ments of the cav­ity al­lowed for the de­vel­op­ment of low cost man­u­fac­tur­ing tech­niques, in­clud­ing the use of Re­ac­tor grade nio­bium and at­mos­pheric pres­sure TIG weld­ing. The cav­ity has been fab­ri­cated and tested at 4 K and 2 K, ob­tain­ing a 4 K Qo of 4·108 at the op­er­at­ing volt­age of 0.3 MV, sur­pass­ing the goal volt­age and qual­ity fac­tor re­quired for op­er­a­tion. Re­sults of the cryo­genic tests of the cav­ity will be pre­sented here.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML132
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THPML133	Design and Optimization of the Electron Gun	4995
	K. Huang, T.L. Hepresenter, Z.L. Ren, D.R. Xu, H. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China Y. Chen Department of Information Engineering , Anhui Economic Management Cadres' Institute, Hefei, Anhui, People's Republic of China
	Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 and 10875118. De­sign of an en­ergy-mod­i­fied elec­tron gun is of sig­nif­i­cance to do some re­search on the prop­er­ties of Di­a­mond-am­pli­fied cath­ode. Based on the de­sign method of the Pierce elec­tron gun, the op­ti­mum pa­ra­me­ters of the elec­tron gun have been ob­tained using the Opera-3D pro­gram. And the beam waist's po­si­tion, the beam cur­rent, the beam size and the beam emit­tance re­lated to the elec­tron bean en­ergy was in­ves­ti­gated in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML133
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THPML134	Design of the Magnets of the HALS Project	4998
	Z.L. Ren, C. Chen, T.L. Hepresenter, L. Wang, X.Q. Wang, H. Xu, B. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 * hlxu@ustc.edu.cn ** zhbo@ustc.edu.cn The Hefei Ad­vanced Light Source (HALS) is a fu­ture soft X-ray dif­frac­tion-lim­ited stor­age ring at NSRL, this pro­ject aims to im­prove the bril­liance and co­her­ence of the X-ray beams and to de­crease the hor­i­zon­tal emit­tance. The lat­tice of the HALS ring re­lies on mag­nets with de­mand­ing spec­i­fi­ca­tions, in­clud­ing com­bined func­tion di­pole-quadrupoles (DQs) with high gra­di­ents, dipoles with lon­gi­tu­di­nal gra­di­ents (DLs), high gra­di­ent quadrupoles and strong sex­tupoles. The com­bined di­pole-quadru­pole de­sign de­vel­oped is be­tween the off­set quadru­pole and sep­tum quadru­pole types. The lon­gi­tu­di­nal-gra­di­ent dipoles are per­ma­nent mag­nets. The quadrupoles and sex­tupoles rely on a more con­ven­tional de­sign. All the mag­nets have been de­signed using POS­SION, Radia, and OPERA-3D.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML134
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THPML135	Design of the Combined Function Dipole-Quadrupoles (DQS) with High Gradients	5001
	Z.L. Ren, C. Chen, T.L. Hepresenter, L. Wang, X.Q. Wang, H. Xu, B. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by the National Nature Science Foundation of China under Grant Nos.11375176 * hlxu@ustc.edu.cn **zhbo@ustc.edu.cn Com­bined di­pole-quadrupoles (DQs) can be ob­tained with the de­sign of ta­pered di­pole or off­set quadru­pole. How­ever, the ta­pered di­pole de­sign can not achieve a high gra­di­ent field, as it will lead to poor field qual­ity in the low field area of the mag­net bore, and the de­sign of off­set quadru­pole will in­crease the mag­net size and power con­sump­tion. Fi­nally, the di­pole-quadru­pole de­sign de­vel­oped is be­tween the off­set quadru­pole and sep­tum quadru­pole types. The di­men­sions of the poles and the coils of the low field side have been re­duced. The 2D pole pro­file is sim­u­lated and op­ti­mized by using POS­SION and Radia, while the 3D modle using Radia and OPERA-3D. The end shim­ming and cham­fer are mod­elled to meet the field uni­for­mity re­quire­ment.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML135
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THPML136	Study of Secondary Electron Generation and Transport in Diamond	5004
SUSPF025	use link to see paper's listing under its alternate paper code
	T.L. He, K. Huang, Z.L. Ren, L. Wang, D.R. Xu, H. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	En­er­getic pri­mary elec­trons (~ keV) im­ping­ing on the di­a­mond film with its both sur­face under bias field in ~ MV/m, will ex­cite sec­ondary elec­tron (SE) re­sponse in­clud­ing SE gen­er­a­tion & trans­port. Al­though there have been 3D Monte Carlo (MC) sim­u­la­tion to study the two processes, this paper will in­tro­duce an­other method. Based on op­ti­cal di­elec­tric model, 3D MC sim­u­la­tion was im­ple­mented to study the gen­er­a­tion process, and SE gen­er­a­tion func­tion was ob­tained by fit­ting the cal­cu­la­tions. Using this func­tion, the dif­fu­sion-drift equa­tion of charge car­ri­ers (elec­tron and hole) can be solved in 1D for the trans­port process, and the vari­a­tion of SE depth dis­tri­b­u­tion with time can be ob­tained.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML136
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THPML138	Efficiency and Error Analysis of the HALS Injection Scheme	5008
	Z.B. Sun, G. Liu, W. Liu, F.L. Shang, L. Shang, W.B. Song USTC/NSRL, Hefei, Anhui, People's Republic of China
	Hefei Ad­vanced Light Source (HALS) is a newly de­signed dif­frac­tion-lim­ited stor­age ring.. The lat­est ver­sion of HALS has a 7BA lat­tice. One of the most im­por­tant parts about HALS de­sign is its in­jec­tion sys­tem. Since con­ven­tional in­jec­tion scheme is not suit­able for DLSRs, many new in­jec­tion schemes are pro­posed, in­clud­ing lon­gi­tu­di­nal in­jec­tion scheme. In this paper, we in­ves­ti­gate the fea­si­bil­ity of lon­gi­tu­di­nal in­jec­tion scheme for HALS. In order to eval­u­ate the in­jec­tion per­for­mance, var­i­ous er­rors have been con­sid­ered. A se­ries of track­ing sim­u­la­tions are car­ried out and in­jec­tion ef­fi­ciency is ob­tained under dif­fer­ent error lev­els.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML138
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THPML140	Radiation Monitoring System of HLSII	5011
	Lin, H.S. Lin, Y.Q. Cai, S.P. Jiang, Z.B. Sunpresenter, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by the National Science Foundation of China 11675170 By the Fundamental Research Funds for the Central Universities WK2310000056 Mon­i­tor­ing of ion­iz­ing ra­di­a­tion of syn­chro­tron ra­di­a­tion fa­cil­ity is very im­por­tant for the safety of staff and users of the light source. Ra­di­a­tion mon­i­tor­ing sys­tem of HLSII has been built and the whole sys­tem con­sists of local ra­di­a­tion mon­i­tor­ing spots and cen­tral con­trol sys­tem, and a web-based mon­i­tor­ing dy­namic re­lease sys­tem. The local ra­di­a­tion mon­i­tor­ing spot con­sists of a high air pres­sure ion­iza­tion type gamma de­tec­tor and a BF3 count­ing tube neu­tron de­tec­tor, and the ra­di­a­tion data are cal­cu­lated by mi­cro­con­troller lo­cally and ac­quired by the data server for fur­ther pro­cess­ing. The dy­namic re­lease sys­tem is in­te­grated with EPICS in­ter­face and ra­di­a­tion safety in­ter­lock sys­tem. Other ac­cel­er­a­tor sys­tems could ob­tain ra­di­a­tion data from the server and the in­ter­lock sys­tem is trig­gered by the ra­di­a­tion data to shut down the ma­chine in case the ra­di­a­tion ex­ceeds the safety thresh­old.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THPML140
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