COOL 2007 - List of Keywords (pick-up)

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

pick-up

Paper	Title	Other Keywords	Page
MOM2C05	Longitudinal Accumulation of Ion Beams in the ESR Supported by Electron Cooling	electron, injection, 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.
	Slides

MOA1I01	Bunched Beam Stochastic Cooling at RHIC	proton, kicker, ion, beam-losses	25
	J. M. Brennan, M. Blaskiewicz BNL, Upton, Long Island, New York
	Stochastic cooling of ions in RHIC has been implemtneted to counteract Intra-Beam Scattering and prevent debunching during stores for luminosity production. The two main challenges in cooling bunched beam at 100 GeV/n are the coherent components in the Schottky spectra and producing the high voltage for the kicker in the 5 - 8 GHz band required for optimal cooling. The technical solutions to these challenges are described. Results of cooling proton beam in a test run and cooling gold ions in the FY07 production run are presented.
	Slides

MOA1C02	Stochastic Cooling for the HESR at FAIR	target, antiproton, emittance, proton	30
	H. Stockhorst, R. Maier, D. Prasuhn, R. Stassen FZJ, Jülich T. Katayama CNS, Saitama L. Thorndahl CERN, Geneva
	The High-Energy Storage Ring (HESR) of the future International Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt is planned as an anti-proton cooler ring in the momentum range from 1.5 to 15 GeV/c. An important and challenging feature of the new facility is the combination of phase space cooled beams with internal targets. The required beam parameters and intensities are prepared in two operation modes: the high luminosity mode with beam intensities up to 10¹¹ and the high resolution mode with 10¹⁰ anti-protons cooled down to a relative momentum spread of only a few 10^-5. In addition to electron cooling transverse and longitudinal stochastic cooling are envisaged to accomplish these goals. A detailed numerical and analytical approach to the Fokker- Planck equation for momentum cooling including an internal target has been carried out to demonstrate the stochastic cooling capability. Cooling model predictions are compared with the stochastic cooling performance of the operational cooling system in the cooler synchrotron COSY.
	Slides

MOA1C03	Stochastic Cooling for the FAIR Project	accumulation, kicker, antiproton, injection	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.
	Slides

MOA2I04	Antiproton Production and Accumulation	antiproton, kicker, optics, emittance	39
	V. A. Lebedev Fermilab, Batavia, Illinois
	Funding: Work supported by the Fermi Research Alliance, under contract DE-AC02-76CH03000 with the U. S. Dept. of Energy. In the course of Tevatron Run II (2001-2007) improvements of antiproton production have been one of major contributors into the collider luminosity growth. Commissioning of Recycler ring in 2004 and making electron cooling operational in 2005 freed Antiproton source from a necessity to keep large stack in Accumulator and allowed us to boost antiproton production. That resulted in doubling average antiproton production during last two years. The paper discusses improvements and upgrades of the Antiproton source during last two years and future developments aimed on further stacking improvements.
	Slides

TUA2C05	Introduction to the Session on Lattice Optimization for Stochastic Cooling	lattice, quadrupole, kicker, betatron	96
	D. Möhl CERN, Geneva
	Lattices that circumvent the ‘mixing dilemma’ for stochastic cooling have repeatedly been considered but were not adopted in the original design of existing cooling rings. Recently new interest has arisen to modify existing machines and to design future ‘optimum mixing rings’. This talk is meant to summarize the pros and cons with the aim to introduce the discussion.
	Slides

TUA2C06	A Split-Function Lattice for Stochastic Cooling	lattice, kicker, proton, dipole	99
	J. Wei BNL, Upton, Long Island, New York S. Wang IHEP Beijing, Beijing
	*Funding: Work performed under the auspices of the US Department of Energy.** During the EPAC 2006 we reported the lattice design for rapid-cycling synchrotrons used to accelerate high-intensity proton beams to energy of tens of GeV for secondary beam production. After primary beam collision with a target, the secondary beam can be collected, cooled, accelerated or decelerated by ancillary synchrotrons for various applications. For the main synchrotron, the lattice has: flexible momentum compaction to avoid transition and to facilitate RF gymnastics long straight sections for low-loss injection, extraction, and high-efficiency collimation dispersion-free straights to avoid longitudinal-transverse coupling, and momentum cleaning at locations of large dispersion with missing dipoles. Then, we present a lattice for a cooler ring for the secondary beam. The momentum compaction across half of this ring is near zero, while for the other half it is normal. Thus, bad mixing is minimized while good mixing is maintained for stochastic beam cooling.
	Slides

TUA2C07	Advanced HESR Lattice with Non-Similar Arcs for Improved Stochastic Cooling	lattice, quadrupole, kicker, dynamic-aperture	102
	Y. Senichev FZJ, Jülich
	Optimized stochastic cooling requires special ion optical conditions in a storage ring. The frequency slip factor strongly influences the mixing factor, and strong requirements have to be fulfilled by the unwanted mixing of the path from pickup to kicker and the wanted mixing on the way from kicker to pickup. Several ideas for a lattice with "irregular" momentum compaction factor have been investigated. The influence of possible lattice modifications to the stochastic cooling performance for COSY will be discussed. Investigations of a lattice optimized for the stochastic cooling in HESR will be summarized.
	Slides

TUA2C08	Lattice Considerations for the Collector and the Accumulator Rings of the FAIR Project	antiproton, lattice, injection, 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.
	Slides

WEM2I05	Bunched Beam Stochastic Cooling Simulations and Comparison with Data	simulation, emittance, kicker, ion	125
	M. Blaskiewicz, J. M. Brennan BNL, Upton, Long Island, New York
	Funding: Work performed under the auspices of the United States Department of Energy. With the experimental success of longitudinal, bunched beam stochastic cooling in RHIC it is natural to ask whether the system works as well as it might and whether upgrades or new systems are warranted. A computer code, very similar to those used for multi-particle coherent instability simulations, has been written and is being used to address these questions.

THAP13	Recent Developments for the HESR Stochastic Cooling System	impedance, coupling, simulation, kicker	191
	R. Stassen, P. B. Brittner, R. Greven, H. Singer, H. Stockhorst FZJ, Jülich L. Thorndahl CERN, Geneva
	Two cooling systems will be installed in the High-Energy Storage Ring (HESR) of the future international Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt: an electron cooler (1.5-8 GeV/c) and a stochastic cooling system from 3.8 GeV/c up to the highest momentum of the HESR (15 GeV/c). Both cooler are mandatory for the operation of the HESR with the PANDA pellet target. The relative low aperture (89mm) of the HESR suggests fixed structures without a plunging system. An octagonal layout was chosen to increase the sensitivity of the electrodes. Two different types of electrodes were built and tested. We will report on the comparison of printed λ/4 loops and new broadband slot couplers.

THAP14	Pick-Up Electrode System for the CR Stochastic Cooling System	simulation, impedance, cryogenics, dipole	194
	C. Peschke, F. Nolden GSI, Darmstadt
	The collector ring (CR) of the FAIR project will include a fast stochastic cooling system for exotic nuclei with a β of 0.83 and antiprotons with a β of 0.97. To reach a good signal to noise ratio of the pick-up even with a low number of particles, a cryogenic movable pick-up electrode system based on slotlines is under development. The sensitivity and noise properties of an electrode array has been calculated using field-simulation and equivalent circuits. For three-dimensional field measurements, an E-near-field probe moved by a computer controlled mapper has been used.
	Poster

THAP15	Beam Based Measurements for Stochastic Cooling Systems at Fermilab	antiproton, resonance, accumulation, lattice	198
	V. A. Lebedev, R. J. Pasquinelli, S. J. Werkema Fermilab, Batavia, Illinois
	Maximizing performance of stochastic cooling would not be possible without beam based measurements. In this paper we discuss experience with beam based measurements of Antiproton source stochastic cooling; and how the measurement results are used in building of the cooling system model. Work supported by the Fermi Research Alliance, under contract DE-AC02-76CH03000 with the U. S. Dept. of Energy.
	Poster

THAP21	Longitudinal Schottky Signals of Cold Systems with Low Number of Particles	ion, storage-ring, simulation, electron	213
	R. W. Hasse GSI, Darmstadt
	Very cold systems of ions with sufficiently low number of particles arrange in an ordered string-like fashion. The determination of the longitudinal momentum spread and of the transverse temperature then is no longer possible by normal Schottky diagnosis. In this paper we simulate such systems in an infinitely long beam pipe with periodic boundary conditions under the influence of all long-range Coulomb interactions by Ewald summation. Then we derive the behaviour of the longitudinal Schottky signals for cold string-like systems as well as for the transition to warmer systems when the strings break, up to hot gas-like systems. Here effects from the finite number of particles, of higher harmonics and of temperature agree with those derived analytically in the limits of very low and very high temperatures.
	Poster