COOL 2007 - List of Keywords (injection)

A B C D E F G H I K L O P Q R S T U V

injection

Paper	Title	Other Keywords	Page
MOM2C05	Longitudinal Accumulation of Ion Beams in the ESR Supported by Electron Cooling	electron, pick-up, ion, accumulation	21
	C. Dimopoulou, B. Franzke, T. Katayama, G. Schreiber, M. Steck GSI, Darmstadt D. Möhl CERN, Geneva
	Recently,two longitudinal beam compression schemes have been successfully tested in the Experimental Storage Ring (ESR) at GSI with a beam of bare Ar ions at 65 MeV/u injected from the synchrotron SIS18. The first employs Barrier Bucket pulses, the second makes use of multiple injections around the unstable fixed point of a sinusoidal RF bucket at h=1. In both cases continuous application of electron cooling maintains the stack and merges it with the freshly injected beam. These experiments provide the proof of principle for the planned fast stacking of Rare Isotope Beams in the New Experimental Storage Ring (NESR) of the FAIR project.
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MOA1C03	Stochastic Cooling for the FAIR Project	pick-up, accumulation, kicker, antiproton	35
	F. Nolden, A. Dolinskii, C. Peschke GSI, Darmstadt
	Stochastic cooling is used in the framework of the FAIR project at GSI for the first stage of phase space compression for both rare isotope and antiproton rings. The collector ring CR serves for the precooling of rare isotope and antiproton beams. Stochastic accumulation will be used for the preparation of high intensity beams for experiments in the HESR or for the low-energy FLAIR facility. The technical and beam parameters of these systems are presented. Stochastic cooling in the HESR is treated in a different contribution.
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MOA2I06	Electron Cooling Status and Characterization at Fermilab’s Recycler	electron, antiproton, emittance, extraction	49
	L. R. Prost, A. V. Burov, K. Carlson, A. V. Shemyakin, M. Sutherland, A. Warner Fermilab, Batavia, Illinois
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy FNAL’s electron cooler (4.3 MV, 0.1 A DC) has been integrated to the collider operation for almost two years, improving the storage and cooling capability of the Recycler ring (8 GeV antiprotons). In parallel, efforts are carried out to characterize the cooler and its cooling performance. This paper discusses various aspects of the cooler performance and operational functionality: high voltage stability of the accelerator (Pelletron), quality of the electron beam generated, operational procedures (off-axis cooling, electron beam energy measurements and calibration) and cooling properties (in the longitudinal and transverse directions). In particular, we show measurements of the friction force and cooling rates, which we compare to a non-magnetized model and conclude that the effective electron beam radius is smaller than expected.
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TUM1I01	Cooling Results from LEIR	electron, ion, gun, controls	55
	G. Tranquille CERN, Geneva
	The LEIR electron cooler has been successfully commissioned for the cooling and stacking of Pb⁵⁴⁺ ions in LEIR during 2006. The emphasis of the three short commissioning runs was to produce the so-called “early” beam needed for the first LHC ion run. In addition some time was spent investigating the difficulties that one might encounter in producing the nominal LHC ion beam. Cooling studies were also made whenever the machine operational mode made it possible, and we report on the preliminary results of the different measurements (cooling-down time, lifetime etc.) performed on the LEIR cooler. Our investigations also included a study of the influence of variable electron density distributions on the cooling performance.
	Slides

TUM1I02	Commissioning of Electron Cooling in CSRm	electron, ion, accumulation, acceleration	59
	X. D. Yang, D. Q. Gao, Y. He, G. H. Li, J. Li, Y. Liu, L. J. Mao, R. S. Mao, M. T. Song, J. W. Xia, G. Q. Xiao, J. C. Yang, X. T. Yang, Y. J. Yuan, W.-L. Zhan, W. Zhang, H. W. Zhao, T. C. Zhao, J. H. Zheng, Z. Z. Zhou IMP, Lanzhou V. V. Parkhomchuk BINP SB RAS, Novosibirsk
	A new generation cooler was commissioned in CSRm, ¹²C⁶⁺ beam with energy 7MeV/u was delivered by a small cyclotron SFC, then injected into CSRm by stripping mode, the average pulse particle number is about 6.8×10⁸ in one injection, with the help of electron cooling of partial hollow electron beam, 3×10⁹ particle were accumulated in the ring after 10 times injection in 10 seconds, and 2×10⁹ particle were accelerated to final energy 1GeV/u, the momentum spread and the lifetime of ion beam were measured roughly. The work point of ring was monitored during the process of acceleration. The close-orbit correction was done initially. The momentum cooling time was about 0.3sec. About 1.6×10¹⁰ particle was stored in the ring after longer time accumulation.
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TUA2C08	Lattice Considerations for the Collector and the Accumulator Rings of the FAIR Project	antiproton, lattice, pick-up, kicker	106
	A. Dolinskii, F. Nolden, M. Steck GSI, Darmstadt
	Two storage rings (Collector Ring (CR) and Recycled Experimental Storage Ring (RESR)) have been designed for efficient cooling, accumulation and deceleration of antiproton and rare isotopes beams. The large acceptance CR must provide efficient stochastic cooling of hot radioactive ions as well as antiproton beams. The RESR will be used as an accumulator of high intensity antiproton beams and a decelerator of rare isotopes. Different lattice structures have been considered in order to achieve good properties for the stochastic cooling and at the same time the maximum dynamic aperture. The structure of the ring lattices and its ion optical properties are described in this contribution. The beam dynamics stability and flexibility for operation in different modes are discussed.
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THM1I01	Commissioning and Performance of LEIR	ion, linac, vacuum, lattice	134
	C. Carli CERN, Geneva
	The Low Energy Ion Ring (LEIR) is a key element of the LHC ion injector chain. Under fast electron cooling, several long pulses from the ion Linac 3 are accumulated and cooled, and transformed into short bunches with a density sufficient for the needs of the LHC. Experience from LEIR commissioning and the first runs in autumn 2006 and summer 2007 to provide the so-called "early LHC ion beam" for setting-up in the PS and the SPS will be reported. Studies in view of the beam needed for nominal LHC ion operation are carried out in parallel to operation with lower priority.
	Slides

THAP06	Cooling in a Compound Bucket	antiproton, emittance, electron, diagnostics	171
	A. V. Shemyakin, C. M. Bhat, D. R. Broemmelsiek, A. V. Burov, M. Hu Fermilab, Batavia, Illinois
	Funding: FNAL is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. Presently antiprotons in Fermilab’s Recycler ring are stored between rectangular RF barriers and are cooled both by a stochastic cooling system in full duty-cycle mode and by a DC electron beam. Electron cooling creates correlation between longitudinal and transverse tails of the antiproton distribution because particles with large transverse actions are cooled much more slowly than the core ones. Introducing additional RF barriers of lower amplitude allows separating spatially (along the bunch) the core and the tail. In this scenario, stochastic cooling can be “gated” to the tail, i.e. applied with a high gain to the low-density region and turned off for the core portion of the beam. This significantly increases the cooling rate of the tail particles, while the temperature of the core is preserved by electron cooling. In this paper, we will describe the procedure and first experimental results in detail.

THAP19	Influences of Space Charge Effect during Ion Accumulation Using Moving Barrier Bucket Cooperated with Beam Cooling	ion, space-charge, electron, accumulation	206
	T. Kikuchi, S. Kawata Utsunomiya University, Utsunomiya T. Katayama GSI, Darmstadt
	Space charge effect is important role for stacking of antiprotons and ions in an accumulation ring. The Coulomb force displaces the beam orbits from the designed correct motion. The beam particles kicked out from the ring acceptance by the space charge force are lost. The space charge effect interfere the beam stacking, and the number of the accumulated beam decreases and the emittance is increased. The longitudinal ion storage method by using a moving barrier bucket system with a beam cooling can accumulate the large number of secondary generated beams. After the multicycle injections of the beam bunch, the stored particles are kicked by the space charge effect of the accumulated beam. Using numerical simulations, we employ the longitudinal particle tracking, which takes into account the barrier bucket voltage, the beam cooling and the space charge effect, for the study of the beam dynamics during the accumulation operations. T. Katayama, P. Beller, B. Franzke, I. Nesmiyan, F. Nolden, M. Steck, D. Mohl and T. Kikuchi, AIP Conference Proc. 821 (2005) 196.

FRM2C05	Simulation Study of Beam Accumulation with Moving Barrier Buckets and Electron Cooling	electron, ion, emittance, simulation	238
	T. Katayama, C. Dimopoulou, B. Franzke, M. Steck GSI, Darmstadt T. Kikuchi Utsunomiya University, Utsunomiya D. Möhl CERN, Geneva
	An effective ion beam accumulation method in NESR at FAIR project, is investigated with numerical way. The princile of accumulation method is as follows: Ion beam bunch from the collector ring or synchrotron is injected in the longitudinal gap space prepared by moving barrier voltage in NESR. Injected beam becomes instantly coasting beam after switching off the barrier voltage and is migrated with the previously stacked beam. After the momentum spread is well cooled by electron cooling, the barrier voltage is switched on and moved to prepare the empty gap space for the next injection. This process is repeated say 20 times to attain the required intensity. We have investigated this stacking process numerically, including the Intra Beam Scattering effect which might limit the stacking current in the ring. Detailed simulated results will be presented for the NESR case as well as the ESR experimental parameters.
	Slides