COOL 2007 - List of Keywords (antiproton)

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

antiproton

Paper	Title	Other Keywords	Page
MOM1I01	Status of the Recycler Ring	electron, emittance, collider, luminosity	1
	P. Derwent Fermilab, Batavia, Illinois
	Funding: US Department of Energy I will present the current operational status of the Fermilab Recycler Ring. Using a mix of stochastic and electron cooling, we prepare antiproton beams for the Fermilab Tevatron Collider program.
	Slides

MOM1I02	Status of the Antiproton Decelerator and of the ELENA Project at CERN	electron, emittance, optics, extraction	6
	P. Belochitskii CERN, Geneva
	The Antiproton Decelerator (AD) at CERN operates for physics since 2000. It delivers low energy antiprotons for production and study of antihydrogen, for atomic physics and for medical research. Two beam cooling systems, stochastic and electron, play key role in AD operation. They make transverse and longitudinal emittances small, which is obligatory condition for beam deceleration without losses, as well for physics. The machine performance is reviewed, along with plans for the future. Significant improvement of intensity and emittances of the beam delivered to the experiments could be achieved with the addition of a small ring suitable for further deceleration and cooling. The details of this new extra low energy antiproton ring (ELENA) and its status are presented.
	Slides

MOA1C02	Stochastic Cooling for the HESR at FAIR	target, emittance, proton, pick-up	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	pick-up, accumulation, kicker, 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	kicker, 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

MOA2C05	Calculations on High-energy Electron Cooling in the HESR	electron, target, emittance, luminosity	44
	D. Reistad, B. Gålnander, K. Rathsman TSL, Uppsala A. O. Sidorin JINR, Dubna, Moscow Region
	Funding: This work is supported by Uppsala University through The Svedberg Laboratory and by the European Community under Contract Number 515873, DIRACsecondary-Beams The HESR will work in a high-resolution mode with 1·10¹⁰ stored antiprotons and a high-luminosity mode with 1·10¹¹ stored antiprotons. It will be equipped with both stochastic cooling and electron cooling systems. The main purpose of the electron-cooling system is to provide relative momentum spread in the antiproton beam of a few 1·10^-5 (90 %) during experiments with an internal hydrogen pellet target and with luminosity 2·10³¹ – 2·10³² cm^-2s^-1. The hydrogen pellet target is expected to produce a stream of frozen hydrogen pellets with diameter 30 μm, which move with 60 m/s and at a rate of 20,000 s^-1. The pellet stream is expected to have a diameter of 2–3 mm. Therefore, in order to avoid excessive fluctuations in the count rate, the antiproton beam size at the target must not be too small. This is solved by slightly tilting the electron beam with respect to the antiproton beam, thus making use of a so-called Hopf bifurcation. In order to get a high duty factor on another time scale, while not sacrificing momentum acceptance, a barrier-bucket rf. system will be employed. The electron-cooling system will initially be built for an antiproton energy range from 800 MeV to 9 GeV, but will be built so that its energy can be extended to the full energy of the HESR (14 GeV) at a later stage. The paper discusses the choice of parameters for the electron cooling system and presents simulations.
	Slides

MOA2I06	Electron Cooling Status and Characterization at Fermilab’s Recycler	electron, emittance, extraction, injection	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.
	Slides

TUM1I03	Comparison of Hollow Electron Devices and Electron Heating	electron, ion, accumulation, emittance	64
	V. V. Parkhomchuk BINP SB RAS, Novosibirsk
	The first results of the electron cooling with hollow electron beam are present. The electron coolers with varable electron beam profiles was commissioned at CERN and IMP (China). Accumulation of the ion beam was demonstrated.
	Slides

TUA2C08	Lattice Considerations for the Collector and the Accumulator Rings of the FAIR Project	lattice, pick-up, 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

TUA2C09	Lattice Optimization for the Stochastic Cooling in the Accumulator Ring at Fermilab	lattice, emittance, kicker, 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

THM2I04	Progress with Tevatron Electron Lenses	electron, proton, gun, simulation	144
	V. Kamerdzhiev, Y. Alexahin, G. F. Kuznetsov, V. D. Shiltsev, X. Zhang Fermilab, Batavia, Illinois
	Funding: Work supported by the U. S. Department of Energy under contract No. DE-AC02-07CH11359 The Tevatron Electron Lenses (TELs) were initially proposed for compensation of long-range and head-on beam-beam effects of the antiproton beam at 980 GeV. Recent advances in antiproton production and electron cooling led to a significant increase of antiproton beam brightness. It is now the proton beam that suffers most from the beam-beam effects. Discussed are the concept of Electron Lenses and commissioning of the second TEL in 2006-2007. The latest experimental results obtained during numerous studies with high energy proton beam are presented.
	Slides

THAP06	Cooling in a Compound Bucket	emittance, electron, injection, 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.

THAP08	Electron Cooling in the Recycler Cooler	electron, simulation, emittance, cathode	175
	A. V. Shemyakin, L. R. Prost Fermilab, Batavia, Illinois A. V. Fedotov BNL, Upton, Long Island, New York A. O. Sidorin JINR, Dubna, Moscow Region
	Funding: FNAL is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. A 0.1-0.5 A, 4.3 MeV DC electron beam provides cooling of 8 GeV antiprotons in Fermilab's Recycler storage ring. Properties of electron cooling have been characterized in measurements of the drag force, cooling rates, and equilibrium distributions. The paper will report experimental results and compare them with modeling by BETACOOL code.

THAP09	Beam-based Field Alignment of the Cooling Solenoids for Fermilab’s Electron Cooler	electron, dipole, emittance, ground-motion	179
	L. R. Prost, A. V. Shemyakin Fermilab, Batavia, Illinois
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy The cooling section of FNAL’s electron cooler is composed of ten (10) 2 m-long, 105 G solenoids. When FNAL’s electron cooler (4.3 MeV, 0.1 A DC) was first install at the Recycler ring, the magnetic field of the cooling solenoid was carefully measured and compensated to attain the field quality necessary for effective cooling [V. Tupikov et al. COOL’05]. However, the tunnel ground motion deteriorates the field quality perceived by the beam over time. We have developed a technique which uses the cooling strength as an indication of the relative field quality and allowing us to re-align the longitudinal magnetic field in the successive solenoids of the cooling section assuming that the transverse component of the field in each solenoid has not varied.

THAP10	Status of Design Work Towards an Electron Cooler for HESR	electron, gun, diagnostics, vacuum	182
	B. Gålnander, T. Bergmark, O. Byström, S. Johnson, T. Johnson, T. Lofnes, G. Norman, T. Peterson, K. Rathsman, D. Reistad TSL, Uppsala H. Danared MSL, Stockholm
	Funding: Work supported by Uppsala University and by the European Union under FP6, Contract number 515873 - DIRAC Secondary Beams. The HESR-ring of the future FAIR-facility at GSI will include both electron cooling and stochastic cooling in order to achieve the demanding beam parameters required by the PANDA experiment. The high-energy electron cooler will cool antiprotons in the energy range 0.8 GeV to 8 GeV. The design is based on an electrostatic accelerator and shall not exclude a further upgrade to the full energy of HESR, 14.1 GeV. The beam is transported in a longitudinal magnetic field of 0.2 T and the requirement on the straightness of the magnetic field is as demanding as 10^-5 radians rms at the interaction section. Furthermore, care must be taken in order to achieve an electron beam with sufficiently small coherent cyclotron motion and envelope scalloping. This puts demanding requirements on the electron beam diagnostics as well as the magnetic field measuring equipment. Prototype tests of certain components for these tasks are being performed. The paper will discuss these tests and recent development in the design including the high-voltage tank, electron gun and collector, magnet system, electron beam diagnostics and the magnetic field measuring system.
	Poster

THAP15	Beam Based Measurements for Stochastic Cooling Systems at Fermilab	pick-up, 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

THAP16	New Equalizers for Antiproton Stochastic Cooling at Fermilab	controls, accumulation	202
	V. A. Lebedev, R. J. Pasquinelli, D. Sun Fermilab, Batavia, Illinois
	To maximize performance of Antiproton source stochastic cooling we developed and built equalizers correcting both phase and amplitude of the system gain. Design requirements have been based on the beam measurements of the system gain. Paper presents principles of the design and details of engineering, manufacturing and tuning of the equalizers. Work supported by the Fermi Research Alliance, under contract DE-AC02-76CH03000 with the U. S. Dept. of Energy.
	Poster

FRM2C04	Studies of Cooling and Deceleration at CRYRING for FLAIR	ion, proton, electron, space-charge	234
	H. Danared, A. Källberg, A. Simonsson MSL, Stockholm
	It is planned that the CRYRING synchrotron and storage ring will be moved to the future FAIR facility at GSI. There it will be used as the Low-energy Storage Ring LSR at FLAIR (Facility for Low-energy Antiproton and Ion Research). LSR will mainly be used for deceleration of antiprotons from 30 MeV down to minimum 300 keV and for deceleration of highly charged ions in the same range of magnetic rigidities. As a preparation for the transfer of CRYRING to FAIR, studies have been made in order to evaluate the performance of CRYRING for deceleration of particles relevant to FLAIR and to set specifications for beams in and out of LSR. Deceleration of protons have been studied by first accelerating the particles to 30 MeV, then decelerating back to 300 keV again. Up to 3·10⁸ protons have been decelerated in 1.8 s without intermediate cooling, and requirements on longitudinal and transverse emittances at 30 MeV for successful deceleration have been estimated. Other studies have included investigations of the space-charge limit for protons at 300 keV and measurements of transverse cooling times for H^- ions, simulating antiprotons. Also an attempt to compare longitudinal cooling forces between protons and H^- ions has been made.
	Slides