THYGBF —  MC4 Orals   (03-May-18   11:00—12:30)
Chair: S.M. Cousineau, ORNL, Oak Ridge, Tennessee, USA

Paper	Title	Page
THYGBF1	High Power Beam Operation of the J-PARC RCS and MR	2938
	Y. Sato KEK, Ibaraki, Japan
	This in­vited talk pre­sents the most re­cent sta­tus of im­prov­ing J-PARC main ring (MR) beam op­er­a­tion to­gether with the rapid cy­cling syn­chro­tron (RCS) ef­fort. The RCS has op­ti­mized the beam per­for­mance for the MR in­jec­tion as well as the muon and neu­tron tar­gets, where each re­quires dif­fer­ent emit­tance and beam halo size. The MR has two ex­trac­tion modes; fast ex­trac­tion (FX) for the long base­line neu­trino os­cil­la­tion ex­per­i­ment, T2K, and slow ex­trac­tion (SX) for ex­per­i­ments in the hadron ex­per­i­men­tal fa­cil­ity. At pre­sent, achieved beam in­ten­si­ties are 2.4·1014 pro­tons per pulse (ppp) with cycle time 2.48 s (470 kW) in the FX mode and 5.1013 ppp with cycle time 5.52 s (44 kW) in the SX mode. For the FX op­er­a­tion, re­cent im­prove­ments are set­tings of new be­ta­tron tune, cor­rec­tions of res­o­nances near the be­ta­tron tune, and adopt­ing 2nd har­monic rf volt­age to re­duce space charge ef­fect. Beam in­sta­bil­i­ties have been sup­pressed with con­trol­ling chro­matic­ity cor­rec­tion and trans­verse feed­back sys­tems. For the SX mode, a dy­namic bump scheme for re­duc­ing ex­tracted beam loss is suc­cess­fully adopted. A high ex­trac­tion ef­fi­ciency of 99.5 % is achieved at the 44 kW beam op­er­a­tion.
	Slides THYGBF1 [6.664 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THYGBF1
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THYGBF2	PIP-II Injector Test Warm Front End: Commissioning Update	2943
	L.R. Prost, R. Andrews, C.M. Baffes, J.-P. Carneiro, B.E. Chase, A.Z. Chen, E. Cullerton, P. Derwent, J.P. Edelen, J. Einstein-Curtis, D. Frolov, B.M. Hanna, D.W. Peterson, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, V.L. Sista, J. Steimel, D. Sun, A. Warner Fermilab, Batavia, Illinois, USA C.J. Richard NSCL, East Lansing, Michigan, USA V.L. Sista BARC, Mumbai, India
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics The Warm Front End (WFE) of the Pro­ton Im­prove­ment Plan II In­jec­tor Test [1] at Fer­mi­lab has been con­structed to its full length. It in­cludes a 15-mA DC, 30-keV H− ion source, a 2 m-long Low En­ergy Beam Trans­port (LEBT) with a switch­ing di­pole mag­net, a 2.1 MeV CW RFQ, fol­lowed by a Medium En­ergy Beam Trans­port (MEBT) with var­i­ous di­ag­nos­tics and a dump. This re­port pre­sents the com­mis­sion­ing sta­tus, fo­cus­ing on beam mea­sure­ments in the MEBT. In par­tic­u­lar, a beam with the pa­ra­me­ters re­quired for in­jec­tion into the Booster (5 mA, 0.55 ms macro-pulse at 20 Hz) was trans­ported through the WFE.
	Slides THYGBF2 [2.434 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THYGBF2
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THYGBF3	Challenges of FAIR Phase 0	2947
	M. Bai, A. Adonin, S. Appel, R. Bär, M.C. Bellachioma, U. Blell, C. Dimopoulou, G. Franchetti, O. Geithner, P. Gerhard, L. Groening, F. Herfurth, R. Hess, R. Hollinger, H.C. Hüther, H. Klingbeil, A. Krämer, S.A. Litvinov, F. Maimone, D. Ondreka, N. Pyka, S. Reimann, A. Reiter, M. Sapinski, B. Schlitt, G. Schreiber, M. Schwickert, D. Severin, R. Singh, P.J. Spiller, J. Stadlmann, M. Steck, R.J. Steinhagen, K. Tinschert, M. Vossberg, G. Walter, U. Weinrich GSI, Darmstadt, Germany
	After two-year's shut­down, the GSI ac­cel­er­a­tors plus the lat­est ad­di­tion of stor­age ring CRYRING, will be back into op­er­a­tion in 2018 as the FAIR phase 0 with the goal to ful­fill the needs of sci­en­tific com­mu­nity and the FAIR ac­cel­er­a­tors and de­tec­tor de­vel­op­ment. Even though GSI has been well known for its op­er­a­tion of a va­ri­ety of ion beams rang­ing from pro­ton up to ura­nium for multi re­search areas such as nu­clear physics, as­tro­physics, bio­physics, ma­te­r­ial sci­ence, the up­com­ing beam time faces a num­ber of chal­lenges in re-com­mis­sion­ing its ex­ist­ing cir­cu­lar ac­cel­er­a­tors with brand new con­trol sys­tem and up­grade of beam in­stru­men­ta­tions, as well as in ris­ing fail­ures of dated com­po­nents and sys­tems. The cy­cling syn­chro­tron SIS18 has been un­der­go­ing a set of up­grade mea­sures for ful­fill­ing fu­ture FAIR op­er­a­tion, among which many mea­sures will also be com­mis­sioned dur­ing the up­com­ing beam time. This paper pre­sents the high­lights of the chal­lenges such as re-es­tab­lish­ing the high in­ten­sity heavy ion op­er­a­tion as well as par­al­lel op­er­a­tion mode for serv­ing multi users. The sta­tus of prepa­ra­tion in­clud­ing com­mis­sion­ing re­sults will also be re­ported.
	Slides THYGBF3 [2.948 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THYGBF3
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THYGBF4	Accelerator Physics Advances in FRIB (Facility for Rare Isotope Beams)	2950
	P.N. Ostroumov, N.K. Bultman, M. Ikegami, S.M. Lidia, S.M. Lund, G. Machicoane, T. Maruta, A.S. Plastun, G. Pozdeyev, X. Rao, J. Wei, T. Xu, T. Yoshimoto, Q. Zhao FRIB, East Lansing, USA C.Y. Wong NSCL, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. DOE Office of Science under Cooperative Agreement DE-SC0000661 and the NSF under Cooperative Agreement PHY-1102511, the State of Michigan and Michigan State University. This paper pre­sents re­cent de­vel­op­ments of ac­cel­er­a­tor physics re­lated top­ics for the Fa­cil­ity for Rare Iso­tope Beams (FRIB) being built at Michi­gan State Uni­ver­sity. While ex­ten­sive beam dy­nam­ics sim­u­la­tions in­clud­ing all known er­rors do not show un­con­trolled beam losses in the linac, ion beam con­t­a­m­i­nants ex­tracted from the ECR ion source to­gether with main ion beam can pro­duce sig­nif­i­cant losses after the charge strip­per. These stud­ies re­sulted in de­vel­op­ment of beam col­li­ma­tion sys­tem at rel­a­tively low en­ergy of 16 MeV/u and room tem­per­a­ture bunch­ers in­stead of orig­i­nally planned su­per­con­duct­ing ones. Com­mis­sion­ing of the Front End en­abled de­tailed beam physics stud­ies ac­com­pa­nied with the sim­u­la­tions using sev­eral beam dy­nam­ics codes. Set­tings of beam op­tics de­vices from the ECR to MEBT has been de­vel­oped and ap­plied to meet im­por­tant pro­ject mile­stones. Sim­i­lar work is planned for the beam com­mis­sion­ing of the first 3 cry­omod­ules in the su­per­con­duct­ing linac.
	Slides THYGBF4 [11.092 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THYGBF4
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