TUO3LR —  Working Group A   (11-Nov-14   13:50—15:50)
Chair: J.A. Holmes, ORNL, Oak Ridge, Tennessee, USA

Paper	Title	Page
TUO3LR01	Understanding Beam Losses in High Intensity Proton Accumulator Rings	192
	R.J. Macek, J.S. Kolski LANL, Los Alamos, New Mexico, USA
	Funding: U.S. Department of Energy under contract DE-AC52-06NA25396 Beam losses and the re­sult­ing ra­dio-ac­ti­va­tion of ac­cel­er­a­tor com­po­nents are major con­sid­er­a­tions gov­ern­ing the op­er­a­tions, de­vel­op­ment and per­for­mance of medium-en­ergy, high-in­ten­sity pro­ton ac­cu­mu­la­tor rings such as the Los Alamos Pro­ton Stor­age Ring (PSR). Sev­eral beam loss mech­a­nisms con­tribute in­clud­ing beam scat­ter­ing (nu­clear and large angle Coulomb scat­ter­ing) in the in­jec­tion foil, pro­duc­tion of ex­cited states of H0 in the H− in­jec­tion strip­per foil that sub­se­quently field strip in the mag­netic fields down stream of the foil, halo growth from space charge ef­fects, beam in­sta­bil­i­ties and losses from the fast ex­trac­tion process. This talk will cover progress in the di­ag­no­sis, mea­sure­ment, and mod­el­ing of beam losses at PSR with some com­par­isons to other rings. The roles the com­puter codes MAD8*, ORBIT**, G4Beam­line***, and oth­ers used in mod­el­ing beam losses will be dis­cussed and the mod­el­ing re­sults com­pared with rel­e­vant ex­per­i­men­tal data. Con­cepts and prospects for fu­ture im­prove­ments such as laser strip­ing for in­jec­tion will be dis­cussed at the end of the pre­sen­ta­tion. * F. Christoph Iselin, The MAD Program, 1994, CERN-BE/ABP ** J. A. Holmes, ICFA BD Newsletter, No 30, page100, 2003. *** Muons, Inc, G4Beamline, http://www.muonsinternal.com/muons3/Computer+Programs
	Slides TUO3LR01 [1.947 MB]
TUO3LR02	BOOSTER UPGRADE FOR 700KW NOVA OPERATIONS	198
	K. Seiya Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The Fer­mi­lab Pro­ton Source is in the process of an up­grade re­ferred to as the Pro­ton Im­prove­ment Plan (PIP). [1] One PIP goal is to have Booster ca­pa­ble of de­liv­er­ing ~2.3·1017 pro­tons/hour, 130% higher than the pre­sent typ­i­cal flux of ~1017 pro­tons/hour. The in­crease will be achieved mainly by in­creas­ing the Booster beam cycle rate from 9 Hz to 15 Hz. Beam loss due to the in­creased flux will need to be con­trolled, so as not to cre­ate larger in­te­grated doses. The sta­tus of pre­sent op­er­a­tions and progress of beam stud­ies will be dis­cussed in this paper.
	Slides TUO3LR02 [3.313 MB]
TUO3LR03	High Intensity Loss Mechanisms on the ISIS Rapid Cycling Synchrotron	203
	C.M. Warsop, D.J. Adams, B. Jones, S.J. Payne, B.G. Pine, H. V. Smith, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom V. Kornilov GSI, Darmstadt, Germany
	ISIS is the spal­la­tion neu­tron source at the Ruther­ford Ap­ple­ton lab­o­ra­tory in the UK. Op­er­a­tion cen­tres on a loss lim­ited, 800 MeV, 50 Hz pro­ton syn­chro­tron which de­liv­ers 0.2 MW to two tar­gets. Un­der­stand­ing loss mech­a­nisms on the ISIS ring is im­por­tant for op­ti­mal op­er­a­tion, ma­chine de­vel­op­ments and up­grades, as well as im­prov­ing un­der­stand­ing for fu­ture ma­chines. The high space charge lev­els, com­bined with the low loss achieved for high power op­er­a­tion, makes the ring an ideal tool for study­ing the physics of beam loss, par­tic­u­larly in a fast ramp­ing con­text. The abil­ity to re­con­fig­ure the beam in stor­age ring mode, and on­go­ing de­vel­op­ments of di­ag­nos­tics and beam mea­sure­ments, are al­low­ing de­tailed stud­ies of image ef­fects, res­o­nances, beam sta­bil­ity and ac­ti­va­tion. We sum­marise re­cent work and progress on these top­ics, com­par­ing with the­ory and sim­u­la­tion where ap­pro­pri­ate.
	Slides TUO3LR03 [2.534 MB]