TUPMK —  MC5 Poster Session   (01-May-18   16:00—17:30)

Paper	Title	Page
TUPMK001	Removal of RF-Fingers at the Edges of the Injection Kickers	1485
	T.F.G. Günzel, N. Ayala, F.F.B. Fernández, U. Iriso, M. Pont ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The ALBA stor­age ring in­jec­tion kick­ers are equipped with RF-fin­gers to close a 2.5 mm gap be­tween the ce­ramic tube and the metal­lic flange. After two dis­tor­tion in­ci­dents that re­quired the re­place­ment of the fin­gers, their re­moval was de­cided. The de­ci­sion could be sup­ported by the ob­ser­va­tion that most of the ad­di­tional im­ped­ance is cre­ated above the cut-off fre­quency of the beam pipe. This was later con­firmed by a tem­per­a­ture de­crease in that zone after the re­moval. Fur­ther­more it was checked that the thresh­olds of the lon­gi­tu­di­nal cou­pled bunch in­sta­bil­i­ties of modes trapped around the re­sult­ing open gap are above the max­i­mal ap­plied beam cur­rent of 400 mA.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK001
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TUPMK002	First Tests of the Apple II Undulator for the LOREA Insertion Device and Front End	1488
	J. Campmany, L.G.O. Garcia-Orta, J. Marcospresenter, Z. Martí, V. Massana, M. Quispe ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	ALBA syn­chro­tron is cur­rently in­stalling the new beam­line LOREA (Low-En­ergy Ul­tra-High-Res­o­lu­tion An­gu­lar Pho­toe­mis­sion for Com­plex Ma­te­ri­als at ALBA). It op­er­ates in the range of 10 - 1500 eV with po­lar­ized light. To pro­duce the light for the beam­line, an Apple II un­du­la­tor with a pe­riod of 125 mm has been cho­sen. It can op­er­ate as an un­du­la­tor at low en­er­gies and as a wig­gler at high en­er­gies, pro­vid­ing a wide en­ergy range. The de­vice was built by KYMA, de­liv­ered on Feb­ru­ary 2017 and in­stalled in Au­gust 2017. We pre­sent the mag­netic mea­sure­ments made dur­ing SAT as well as the sim­u­la­tions of the in­flu­ence of the ID in the elec­tron beam dy­nam­ics and the first mea­sure­ments with beam. On the other hand, the high de­mand­ing char­ac­ter­is­tics of the beam­line lead to a de­vice pro­vid­ing high power and wide beam in some work­ing modes. This sit­u­a­tion has been a chal­lenge for the Front End (FE) ther­mal load. It has been built by the com­pa­nies RMP and TVP, and the FE mod­ules have been in­stalled in the tun­nel along au­tumn 2017. We pre­sent the Site Ac­cep­tance Tests re­sults as well as the tech­ni­cal so­lu­tions adopted, es­pe­cially in terms of me­chan­i­cal de­sign and used ma­te­ri­als.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK002
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TUPMK003	Advances in the Sirius Delta-Type Undulator Project	1491
SUSPF031	use link to see paper's listing under its alternate paper code
	L.N.P. Vilela, R. Basílio, J.F. Citadini, J.R. Furaer, F. Rodrigues LNLS, Campinas, Brazil
	The Delta un­du­la­tor is a com­pact ad­justable-phase in­ser­tion de­vice that pro­vides full light po­lar­iza­tion con­trol. Five un­du­la­tors of this type will be in­stalled in the ini­tial op­er­a­tion phase of Sir­ius, the new 4th gen­er­a­tion syn­chro­tron light source that is being built by the Brazil­ian Syn­chro­tron Light Lab­o­ra­tory (LNLS). In this work we pre­sent the re­cent ad­vances in the de­vel­op­ment of Sir­ius Delta-type un­du­la­tor, the stud­ies of the ef­fects of this de­vice in the stor­age ring beam dy­nam­ics and as­sem­bly and mea­sure­ments strate­gies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK003
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TUPMK004	Using Decoherence to Prevent Damage to the Swap-Out Dump for the APS Upgrade	1494
	M. Borland, J.C. Doolingpresenter, R.R. Lindberg, V. Sajaev, A. Xiao ANL, Argonne, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Ad­vanced Pho­ton Source (APS) is pur­su­ing an up­grade of the stor­age ring to a hy­brid seven-bend-achro­mat* de­sign, which will op­er­ate in swap-out mode. The ul­tra-low emit­tance (about 30 pm in both planes) com­bined with the de­sire to pro­vide high charge (15 nC) in in­di­vid­ual bunches, en­tails very high en­ergy den­sity in the beam. Sim­ple es­ti­mates, con­firmed by sim­u­la­tion, in­di­cate that in­ter­ac­tion of such a bunch with the dump ma­te­r­ial will re­sult in lo­cal­ized melt­ing. Over time, it is pos­si­ble that the beam would drill through the dump and vent the ring vac­uum. This would seem to pre­vent ex­trac­tion and dump­ing of bunches as part of swap out, and also sug­gests that trans­fer­ring of bunches out of the ring car­ries sig­nif­i­cant risk. We de­vised an idea for using a pre-kicker to cause de­co­her­ence of the tar­get bunch emit­tances, mak­ing it safe to ex­tract. Sim­u­la­tions show that the con­cept works very well. *L. Farvacque et al., IPAC13, 79 (2013).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK004
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TUPMK005	CSR Shielding Effect in Dogleg and EEX Beamlines	1498
	G. Ha, M.E. Condepresenter, J.G. Power, E.E. Wisniewski ANL, Argonne, Illinois, USA
	Funding: Department of Energy, Office of HEP and BES under Contract No. DE-AC02-06CH11357. CSR shield­ing is a well-known CSR sup­pres­sion scheme which works by cut­ting off the low fre­quency CSR ra­di­a­tion. Al­though the shield­ing scheme is well known, its ef­fects on the beam has been rarely stud­ied. We in­ves­ti­gate the CSR ef­fect on the beam emit­tance when pass­ing through a dog­leg and a dou­ble dog­leg type EEX beam­line. An ex­per­i­men­tal study is planned at the Ar­gonne Wake­field Ac­cel­er­a­tor fa­cil­ity where we can gen­er­ate a 0.1-100 nC elec­tron beam with an en­ergy of 50 MeV and have a dou­ble dog­leg EEX beam­line. Tun­able shield­ing plates are in­stalled at the di­pole mag­net cham­bers of the EEX beam­line to vary the shield­ing con­di­tion. Trans­verse and lon­gi­tu­di­nal phase space mea­sure­ment sys­tems are pre­pared to char­ac­ter­ize the beam-CSR in­ter­ac­tion, and bolome­ter and in­ter­fer­om­e­try are pre­pared to char­ac­ter­ize CSR. We pre­sent sim­u­la­tion re­sults and pre­lim­i­nary ex­per­i­men­tal re­sults.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK005
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TUPMK006	Sub-fs Electron Bunch Generation Using Emittance Exchange Compressor	1501
	J.M. Seok, M. Chung UNIST, Ulsan, Republic of Korea M.E. Condepresenter, J.G. Power ANL, Argonne, Illinois, USA G. Ha PAL, Pohang, Republic of Korea
	Sub-fs elec­tron bunch has been pur­sued in the last decade using sev­eral dif­fer­ent meth­ods. These meth­ods rely on one of the ve­loc­ity dif­fer­ence or path length dif­fer­ence to com­press a long bunch to sub-fs bunch. Here, we in­tro­duce a new method to gen­er­ate the com­pres­sion. Emit­tance Ex­change (EEX) beam­line makes trans­verse-to-lon­gi­tu­di­nal ex­change of phase space. In this beam­line, a trans­verse fo­cus­ing at the up­stream in­tro­duces a lon­gi­tu­di­nal com­pres­sion at the down­stream due to the ex­change. Since this ex­change scheme does not rely on the ve­loc­ity or the path length dif­fer­ences, it does not re­quire any lon­gi­tu­di­nal ma­nip­u­la­tion (e.g. chirp), and it could gen­er­ate a short bunch with well-con­trolled non­lin­ear ef­fects using non­lin­ear mag­nets. We pre­sent pre­lim­i­nary sim­u­la­tion re­sults of EEX based bunch com­pres­sion and sub-fs bunch gen­er­a­tion.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK006
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TUPMK008	Highly-stable, High-power Picosecond Laser Optically Synchronized to a UV Photocathode Laser for an ICS Hard X-ray Generation	1504
	K.-H. Hong MIT, Cambridge, Massachusetts, USA D. Gadonas, L.M. Hand, K. Neimontas, A. Senin, V. Sinkevicius Light Conversion, Vilnius, Lithuania W.S. Graves, M.R. Holl, L.E. Malin, C. Zhangpresenter Arizona State University, Tempe, USA S. Klingebiel, T. Metzger, K. Michel TRUMPF Scientific Lasers GmbH + Co. KG, Munchen-Unterfoehring, Germany
	Under the CXLS pro­ject at Ari­zona State Uni­ver­sity we are de­vel­op­ing an in­verse Comp­ton scat­ter­ing (ICS) hard X-ray source* to­wards a com­pact XFEL with elec­tron nano-bunch­ing. The ICS in­ter­ac­tion is crit­i­cally de­pen­dent on the qual­ity of dri­ver pulses such as: 1) avail­able peak in­ten­sity, 2) en­ergy/point­ing sta­bil­ity, and 3) rel­a­tive tim­ing sta­bil­ity to UV pulses ini­tially trig­ger­ing elec­tron beams. Here, we re­port on a highly sta­ble, 1 kHz, 200 mJ, 1.1 ps, 1030 nm laser with good beam qual­ity as an ICS dri­ver, op­ti­cally syn­chro­nized to a UV pho­to­cath­ode laser. The ICS dri­ver is based on a Yb:YAG thin-disk re­gen­er­a­tive am­pli­fier (RGA), en­sur­ing an ex­cel­lent en­ergy sta­bil­ity (shot-to-shot 0.52% rms; 0.14% rms over 24 hours). The point­ing sta­bil­ity bet­ter than 4 urad is ob­tained. The M2 fac­tor is as good as ~1.5 at the full en­ergy, lead­ing to the achiev­able laser in­ten­sity of >1017 W/cm2 with f/10 fo­cus­ing. The pho­to­cath­ode laser, a fre­quency-quadru­pled Yb:KGW RGA, share a com­mon seed os­cil­la­tor with the ICS dri­ver for op­ti­cal syn­chro­niza­tion. The resid­ual sub-ps tim­ing drift is fur­ther re­duced to 33 fs rms using an op­ti­cal lock­ing scheme based on a para­met­ric am­pli­fier. * W.S. Graves et al., "Compact X-ray source based on burst mode inverse compton scattering at 100 kHz," Phys. Rev. ST Accel. Beams, Vol. 17, p. 120701 (Dec. 2014).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK008
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TUPMK009	Electron Beam Optics for the ASU Compact XFEL	1507
	C. Zhang, W.S. Graves, M.R. Holl, L.E. Malin Arizona State University, Tempe, USA E.A. Nanni SLAC, Menlo Park, California, USA
	Funding: National Science Foundation Division of Physics (Accelerator Science) award 1632780, award 1231306. DOE grant DE-AC02-76SF00515. Ari­zona State Uni­ver­sity (ASU) is pur­su­ing a new con­cept for a com­pact x-ray FEL (CXFEL) as a next phase of com­pact x-ray light source (CXLS). We de­scribe the elec­tron beam op­tics de­sign for the ASU com­pact XFEL. In pre­vi­ous ex­per­i­ments we in­tro­duced a grat­ing dif­frac­tion method to gen­er­ate a spa­tially mod­u­lated beam. We plan to com­bine a tele­scope imag­ing sys­tem with emit­tance ex­change (EEX) to mag­nify/de­mag­nify the mod­u­lated beam and trans­fer it from trans­verse mod­u­la­tion into a lon­gi­tu­di­nal one to make it an ideal seed for phase-co­her­ent XFEL. The sim­u­la­tion re­sults of the beam line setup will be demon­strated. Our first goal is to suc­cess­fully image the mod­u­lated beam with de­sired mag­ni­fi­ca­tion then we will in­ves­ti­gate var­i­ous mag­ni­fi­ca­tion and mag­nets com­bi­na­tions and op­ti­mize aber­ra­tion cor­rec­tion.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK009
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TUPMK010	Differences in Current Dependent Tune Shifts Measured by Direct or ORM Based Methods	1510
	Y.E. Tan, R.T. Dowd AS - ANSTO, Clayton, Australia
	The change in the tunes as a func­tion of total beam cur­rent is a well doc­u­mented ef­fect and has been at­trib­uted to quadru­pole like self in­duced wake­fields. The­o­ret­i­cal mod­els pre­sented by oth­ers have utilised di­rect meth­ods (spec­trum analyser) to mea­sure the tunes in the analy­sis. In this re­port we shall pre­sent ob­ser­va­tions that show the ORM method, Lin­ear Op­tics from Closed Op­tics (LOCO), and di­rect meth­ods have sig­nif­i­cantly dif­fer­ent tune gra­di­ents. The dif­fer­ent tune gra­di­ents is at­trib­uted to the sta­tic (ORM) and dy­namic (di­rect) na­ture of the mea­sure­ments where in the sta­tic case the vac­uum cham­ber is to be con­sid­ered as a thin wall while in the dy­namic case the vac­uum cham­ber wall is to be con­sid­ered as a thick wall.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK010
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TUPMK011	Single Ring Permanent Magnet Lens	1513
	K. Jayamanna, R.A. Baartman, Y. Bylinskii, T. Planche TRIUMF, Vancouver, Canada M. Corwin UW/Physics, Waterloo, Ontario, Canada R.N. Simpsonpresenter UBC, Vancouver, B.C., Canada
	Funding: TRIUMF receives its funding from the National Research Council of Canada. A per­ma­nent mag­net lens has been de­signed to be a non-pow­ered al­ter­na­tive to so­le­noids for low en­ergy beam trans­port. The lens con­sists of a sin­gle ring of 12 sec­tors, each sec­tor with poles di­rected in­ward. This forms an axial field that re­verses sign at the mid­point, some­what like two op­pos­ing short so­le­noids. It is sim­i­lar to the Iwashita lens* but con­sists of only one ring, not two. A pro­to­type lens op­ti­mized to de­crease the mag­netic ma­te­r­ial re­quired while also re­duc­ing aber­ra­tion, has been built and tested for a 25 keV H-mi­nus beam. Emit­tance fig­ures mea­sured down­stream of the lens are com­pared with the­ory. * Y. Iwashita, "Axial Magnetic Field Lens with Permanent Magnet", Proc. PAC 1993, p.3154.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK011
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TUPMK012	Acceleration of Charged Particles by Own Field in a Non-Stationary One-Dimensional Stream	1516
	A.S. Chikhachev Allrussian Electrotechnical Institute, Moskow, Russia
	The be­hav­ior of a non-sta­tion­ary stream of the charged par­ti­cles in­ter­act­ing with own field is stud­ied. For the de­scrip­tion the in­te­gral of the move­ment re­ceived in works * ** - Meshch­er­sky's in­te­gral is used. The ad­di­tional in­te­gral of the move­ment - in­ter­faced to Meshch­er­sky's in­te­gral, nec­es­sary for com­pletely self-agreed de­scrip­tion of a stream of the par­ti­cles in­ter­act­ing with own field is con­structed. The sys­tem of the equa­tions re­duc­ing a prob­lem to the so­lu­tion of sys­tem of the or­di­nary dif­fer­en­tial equa­tions is re­moved. Pri­vate de­ci­sions for po­ten­tial, den­sity of par­ti­cles and den­sity of cur­rent are pro­vided. Ear­lier the prob­lem was stud­ied in work ***. * Mestschersky J. Astronomische Nachrichten, 1893, T.132, N3153, p. 9. ** Nestschersky ibid, 1902, T.159, N3807, p. 15. *** Chikhachev A.S., Technical Phisics, 2014, vol 59, N 4, pp 487-493.
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TUPMK014	Dipole Fringe Field Analysis of the NSLS-II Storage Ring	1519
	J. Choi, Y. Hidaka, T.V. Shaftan, C.J. Spataro, G.M. Wang BNL, Upton, Long Island, New York, USA
	Funding: DOE Contract No. DE-SC0012704 In the NSLS-II stor­age ring, the ef­fect of the di­pole fringe field is not neg­li­gi­ble and was con­sid­ered al­ready at the de­sign phase. Es­pe­cially in the ver­ti­cal di­rec­tion, the stan­dard sim­u­la­tion codes are using the pa­ra­me­ter called FINT (fringe Field IN­Te­gral) and, if there is no spe­cific in­for­ma­tion, it is usu­ally set to 0.5 which is con­sid­ered as the rea­son­able av­er­age. With the hall-probe mea­sure­ment data of the NSLS-II stor­age ring dipoles, we eval­u­ated mea­sured FINTs and ap­plied them to the beam sim­u­la­tion. The paper shows the re­sult­ing FINTs and their ef­fects.
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TUPMK015	Initial Studies into Longitudinal Ionization Cooling for the Muon g-2 Experiment	1522
	J. Bradley Edinburgh University, Edinburgh, United Kingdom J.D. Crnkovicpresenter BNL, Upton, Long Island, New York, USA D. Stratakis, M.J. Syphers Fermilab, Batavia, Illinois, USA M.J. Syphers Northern Illinois University, DeKalb, Illinois, USA
	Fer­mi­lab's Muon g-2 ex­per­i­ment aims to mea­sure the anom­alous mag­netic mo­ment of the muon to an un­prece­dented pre­ci­sion of 140 ppb. It re­lies on large num­bers of muons sur­viv­ing many turns in the stor­age ring with­out col­lid­ing with the sides, at least long enough for the muons to decay. Lon­gi­tu­di­nal ion­iza­tion cool­ing is in­tro­duced with re­spect to Fer­mi­lab's Muon g-2 ex­per­i­ment in an at­tempt to in­crease stor­age and through this the sta­tis­tics and qual­ity of re­sults. The ion­iza­tion cool­ing is in­tro­duced to the beam through a ma­te­r­ial wedge, an ini­tial sim­u­la­tion study is made into the po­si­tion­ing, ma­te­r­ial, and geo­met­ri­cal pa­ra­me­ters of this wedge using G4Beam­line. Re­sults sug­gest a sig­nif­i­cant in­crease of 20 - 30% in the num­ber of stored muons when the op­ti­mal wedge is in­cluded in the sim­u­la­tion.
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TUPMK016	Using Time Evolution of the Bunch Structure to Extract the Muon Momentum Distribution in the Fermilab Muon g-2 Experiment	1526
	W. Wu, B. Quinn UMiss, University, Mississippi, USA J.D. Crnkovicpresenter BNL, Upton, Long Island, New York, USA
	Beam dy­nam­ics plays an im­por­tant role in achiev­ing the un­prece­dented pre­ci­sion on mea­sure­ment of the muon anom­alous mag­netic mo­ment in the Fer­mi­lab Muon g-2 Ex­per­i­ment. It needs to find the muon mo­men­tum dis­tri­b­u­tion in the stor­age ring in order to eval­u­ate the elec­tric field cor­rec­tion to muon anom­alous pre­ces­sion fre­quency. We will show how to use time evo­lu­tion of the beam bunch struc­ture to ex­tract the muon mo­men­tum dis­tri­b­u­tion by ap­ply­ing a fast ro­ta­tion analy­sis on the decay elec­tron sig­nals.
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TUPMK018	Round Beam Studies at NSLS-II	1529
	Y. Hidaka, W.X. Cheng, Y. Li, T.V. Shaftan, G.M. Wang BNL, Upton, Long Island, New York, USA
	Funding: The study is supported by U.S. DOE under Contract No. DE-AC02-98CH10886. In­stead of typ­i­cal flat beam, some syn­chro­tron light us-ers pre­fer round beam, i.e., with equal hor­i­zon­tal and ver­ti­cal emit­tance, for var­i­ous rea­sons (e.g., sim­pli­fied op­tics, smaller frac­tion of pho­tons get­ting dis­carded, bet­ter phase space match be­tween pho­ton and e-beam). Sev­eral fu­ture up­grade stor­age rings such as APS-U, ALS-U, and SLS-2 cur­rently plan to op­er­ate in round beam mode. We re­port our beam study re­sults on round beam op­er­at­ing at NSLS-II by dri­ving lin­ear dif­fer­ence cou-pling res­o­nance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPMK018
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