COOL 2007 - List of Keywords (kicker)

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

kicker

Paper	Title	Other Keywords	Page
MOA1I01	Bunched Beam Stochastic Cooling at RHIC	proton, ion, pick-up, 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

MOA1C03	Stochastic Cooling for the FAIR Project	pick-up, accumulation, 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, pick-up, 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, pick-up, 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, pick-up, 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, pick-up, 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, pick-up, injection	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

TUA2C09	Lattice Optimization for the Stochastic Cooling in the Accumulator Ring at Fermilab	lattice, antiproton, emittance, optics	110
	V. P. Nagaslaev, V. A. Lebedev, S. J. Werkema Fermilab, Batavia, Illinois
	New efforts are under way at Fermilab to increase the rate of the antiproton production. This program includes the machine optics optimization in order to improve mixing and help stochastic cooling. The new lattice has been implemented in May of this year. Results will be discussed, as well as some aspects of model development and lattice measurements.
	Slides

WEM2I05	Bunched Beam Stochastic Cooling Simulations and Comparison with Data	simulation, pick-up, emittance, 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.

THM2I06	Electron Beams as Stochastic 3D Kickers	electron, ion, space-charge, gun	154
	V. B. Reva, A. V. Ivanov, V. V. Parkhomchuk BINP SB RAS, Novosibirsk
	This article describes an idea combining electron and stochastic cooling in one device. The amplified signal about displacements of the ion from pick-up electrode applied to the control electrode of an electron gun. Thus, a wave of the space charge in the electron beam is induced. This wave propagates with the electron beam to the cooling section. The space charge of the electron beam acts on the ion beam producing a kick. The effectiveness of the amplification can be improved with using a structure similar to a traveling-wave tube.

THAP12	Electron Cooling Design for ELIC - a High Luminosity Electron-Ion Collider *	electron, ion, emittance, collider	187
	Y. S. Derbenev Jefferson Lab, Newport News, Virginia
	*Funding: Authored by Jefferson Science Associate under U. S. DoE Contract No. DE-AC05-06OR23177** An electron-ion collider (EIC) of center mass energy 90 GeV (9 GeV of electron beam x 225 GeV of proton beam) at luminosity level up to 10³⁵/cm²s is envisioned by high energy Nuclear Physics community as a facility adequate for studying of the fundamental properties of quark-gluon structure of nucleons and strong interactions. In response to this quest, a high luminosity ring-ring EIC design (ELIC) is developed at Jefferson Laboratory utilizing 12 GeV upgrade CEBAF accelerator as a full energy injector for electron storage ring . An inevitable component of EIC is high energy electron cooling (EC) for ion beam. The EC facility concept for ELIC is based on use of 30 mA, 125 MeV energy recovery linac (ERL) and 3A circulator-cooler ring (CCR) operated at 15 and 1500 MHz bunch repetition rate, respectively. To switch electron bunches between ERL and CCR, fast kickers of a frequency bandwidth above 2 GHz are designed. The design parameters of EC facility and preliminary results of study of electron beam transports, stability and emittance maintenance in ERL and CCR, together with scenario of forming and cooling of ion beam will be presented.

THAP13	Recent Developments for the HESR Stochastic Cooling System	pick-up, impedance, coupling, simulation	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.