Session 8: Low and Intermediate Energy Accelerators and Sources spc coordinator: K. Blasche, gsi, Darmstadt




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Session 8:

Low and Intermediate Energy Accelerators and Sources

SPC Coordinator: K. Blasche, GSI, Darmstadt


1-284 - Commissioning of Electron Cooler EC-300

Vladimir Borisovich Reva, Valentin Bocharov, Aleksandr Bubley, Yuri Evtushenko, Anatoly Goncharov, Andrey Ivanov, Vadim Kokoulin, Vyacheslav Kolmogorov, Mikhail Kondaurov, Sergey Konstantinov, Victor Kozak, Gennadii Krainov, Yaroslav Kruchkov, Eduard Kuper, Anatoly Medvedko, Leontii Mironenko, Vitalij Panasyuk, Vasily Parkhomchuk, Karl Schreiner, Boris Skarbo, Alexander Skrinsky, Boris Smirnov, Maksim Vedenev, Renat Voskoboinikov, Mikhail Zakhvatkin, Nikolay Zapiatkin (BINP, Novosibirsk), Xiaodong Yang, Hongwei Zhao (IMP, Lanzhou)

The article deals with the commissioning of electron cooler EC-300. It was designed and manufactured for CSR experiment (IMP, Lanzhou, China) by BINP, Russia. The energy of electron beam is up to 300 keV, the electron current is up to 3 A, the magnetic field in the cooling section is up to 1.5 kG. The major innovation of the cooler is the variable profile of electron beam, the electrostatic bends of the electron beam and the system of the magnetic field correction. During commissioning the linearity of the magnetic field 10-6 was obtained, the recuperation efficiency was observed up 10-6 , the pressure of residual gas in the vacuum chamber was 5 10-11 torr during operation with the electron beam. The CSRe cooler for IMP is a new step at cooling technique and the first results achieved during commissioning are very interesting for accelerator physics.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
2-290 - 1.5-GeV FFAG Accelerator as Injector to the BNL-AGS

Alessandro Ruggiero, Michael Blaskiewicz, Dejan Trbojevic, Nicholaos Tsoupas, Wu Zhang (BNL, Upton, Long Island, New York)

A 1.5-GeV Fixed-Field Alternating-Gradient (FFAG) Accelerator has been recently proposed as a new injector to the Alternating-Gradient Synchrotron (AGS) of Brookhaven National Laboratory (BNL). It is being considered as a replacement of the present 1.5-GeV AGS Booster. The substitution will enhance the performance of the AGS accelerator facility in a variety of ways. It would still allow acceleration of all hadronic particles: protons, and heavy-ions. The major benefit is that it would considerably shorten the typical combined AGS acceleration cycle, and, consequently, may yield to an improvement of beam stability, intensity and size. The AGS-FFAG will also facilitate the proposed upgrade of the AGS facility toward a 1-MW average proton beam power. The paper describes a compact FFAG design for acceleration of protons from 200 MeV to 1.5 GeV. The circumference is about 250 m. The lattice is a periodic sequence of FDF triplets of combined-function magnets. An adjusted field profile has been calculated to compensate the variation of the main lattice functions with momentum. At injection, a beam pulse 130 µs long of negative-ions (H?) is stacked with the charge-exchange method. Acceleration of one pulse with 2.5 x 10^13 protons takes about 130 µs, if harmonic-jump scheme is used in conjunction with the choice of 201.25 MHz. Four of such beam pulses are required to fill entirely the AGS. The entire filling process thus takes less than one millisecond.

Work performed under the auspices of the U.S. Department of Energy

Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
3-303 - GANIL-SPIRAL Status Report

Alain Savalle, Frédéric Chautard, Bertrand Jacquot (GANIL, Caen)

The GANIL facility (Caen, France) is dedicated to the acceleration of heavy ion beams for nuclear physics, atomic physics, radiobiology and material irradiation. The production of radioactive ion beams for nuclear physics studies represents the main part of the activity. The in-flight fragmentation method was already used, since 1994, with the SISSI device. Since September 2001, SPIRAL, the Radioactive Ion Beam Facility at GANIL, delivers radioactive species produced by the ISOL method. The heavy ion beams of GANIL are sent onto a target and source assembly, and the radioactive beams are accelerated up to a maximum energy of 25 MeV/u by the cyclotron CIME. The operation and the running statistics of GANIL-SPIRAL are presented, with particular attention to the first SPIRAL beams. Few results about the cyclotron CIME, as the mass selection and tuning principle are summarized. The recent developments for increasing stable beams intensities, up to a factor 13 for argon, for use with SPIRAL, SISSI, or the LISE spectrometer, are presented. Considering the future of GANIL, SPIRAL II projects aims to produce high intensity secondary beams, by fission induced with a 5 mA deuteron beam in an uranium target.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
4-381 - About Low Energy Ions Storing

Alexander Tarasenko, Ivan Guk, Stanislav Kononenko, Anatoliy Paschenko, Ivan Shapoval, Vladimir Yuferov (NSC/KIPT, Kharkov)

The influence of a neutral gas target on the low energy hydrogen isotope ion beam settled energy spread and beam lifetime is considered. It is shown, that a main factor, which determines the circulating beam lifetime, is the ion neutralization on internal target atoms. The estimations of various ways of ionization have shown, that the ionization with plasma target is the most effective. The ratio of the neutral and plasma target densities, when complete beam ionization and all oscillation types damping are provided, is found. The way of creation in the store ring plasma target with high degree of ionization is offered. Its influence on focusing properties of magnetooptical structure is designed. The magnetic structure of 150 KeV tritium ions storage ring and calculated for it the focusing functions, which satisfy requirements to such installation, are given. The received results for a special case of the tritium ions storing allow make conclusion that the offered idea of the low energy ions store can be sold in principle and technically. One of such storage ring possible application may be research on driven fusion.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
5-404 - Redesign of the ISIS Main Magnet Power Supply Storage Choke

Andrew Kimber, James Gray (CCLRC/RAL/ISIS, Chilton, Didcot, Oxon)

The ISIS facility, based at the Rutherford Appleton Laboratory in the UK, provides intense pulsed neutron and muon beams for condensed matter studies. As part of the facilities upgrade and refurbishment program, the 1MJ storage choke which forms part of the main magnet power supply system, will be replaced with a number of smaller units. The present storage choke, which consists of a split secondary winding transformer, is incorporated into a series-parallel resonant circuit known as the 'white circuit'. This circuit ensures that each magnet receives identical currents, but is not subjected to excessive voltages. Although the storage choke is essentially a transformer, its secondary magnetising inductance is relatively low and a precisely defined value. This paper discusses the design and development of ten smaller units which will eventually replace the present equipment, and the testing of a one fifth scale model, which will be used to prove the technology.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
6-418 - Particle Dynamics in the Low Energy Positron Toroidal Accumulator: First Experiments and Results

Grigory Troubnikov, Viktor Antropov, Evgeny Boltushkin, Vladimir Bykovsky, Alexander Ivanov, Sergey Ivashkevich, Andrey Kobets, Iourii Korotaev, Vyacheslav Lohmatov, Igor Meshkov, Dmitry Monahov, Valentin Pavlov, Roman Pivin, Igor Alekseevich Seleznev, Anatoly Olegovich Sidorin, Alexander Smirnov, Evgeny Syresin, Sergey Yakovenko (JINR, Dubna, Moscow Region)

The project of Low Energy Particle Toroidal Accumulator (LEPTA) is dedicated to construction of a positron storage ring with electron cooling of positrons circulating in the ring. Such a peculiarity of the LEPTA enables it automatically to be a generator of positronium (Ps) atoms, which appear in recombination of positrons with cooling electrons inside the cooling section of the ring. The project has a few goals: to study electron and positron dynamics in the ring (particle motion in the horizontal and vertical planes are coupled contrary to of classic cycle accelerators), to set up first experiments with Ps in flight; Magnetic measurements of main LEPTA elements are performed. Several elements : kicker, injection system of electron beam, helical quadrupole, septum magnet are tested and expected design parameters were achieved for those elements. The investigations of electron beam dynamics are started. First results of experiments with circulating electron beam are presented and discussed in this article. Several beam diagnostic methods for studying of strong coupled motion of charged particles are proposed and tested.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
7-446 - Beam Cooling ar S-LSR

Akira Noda, Hicham Fadil, Shinji Fujimoto, Masahiro Ikegami, Toshiyuki Shirai, Takeshi Takeuchi, Mikio Tanabe (ICR Kyoto, Kyoto), Hiromi Okamoto, Yosuke Yuri (HU/AdSM, Higashi-Hiroshima), Hiromu Tongu (ICR/NSRF, Kyoto), Igor Meshkov, Evgeny Syresin (JINR, Dubna, Moscow Region), Manfred Grieser (MPI-K, Heidelberg), Koji Noda, Shinji Shibuya (NIRS, Chiba-shi)

S-LSR is an ion accumulation and cooler ring with the circumference and maximum magnetic rigidity of 22.589 m and 1.0T.m, respectively. Electron beam cooling will be applied for laser-produced hot ion beam after phase rotation. Electron cooler for S-LSR is now under construction and the beam simulation is also going on. Laser cooling of Mg ion with low energy (35 keV) is also planned in 3-dimensional way with use of Synchro-Betatron coupling.so as to realize ultra cold beam. Cancellation of shear force due to orbit-length difference in the dipole section is to be studied with use of overlapping of the radial electric field inversely proportional to the curvature radius with the uniform vertical magnetic field. Possible experiments to approach to ultra-cold beam is also to be studied by computer simulation

Work financially supported by the framework of Advanced Compact Accelerator Development of Ministry of Education, Culture, Sports, Science and Technology

Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
8-451 - Technicalities for a Novel Medium Energy Ion Accelerator

Vladimir Gorev (RRC Kurchatov Institute, Moscow)

Transmutation of radioactive waste,high-intensity pulsed sources of fast neutrons,problem of inertially-confined fusion and a lot of different problems of science and technology put increased demands on the linear high power medium energy proton and heavy ion accelerators.But these accelerators are presently massive,huge and very expansive,which restrict now and in a near future their wide use and motivates the study of altenetive methods to achieve the design current,power and economic characteristics.This report decribes the present reseach on attaining high power medium energy ion beams,using novel idea for accelerator design.Theoretical proposal and preliminary conceptual design for the accelerator,based on a principle of free flying ion emitter("ballistic anode"),were discussed first a few years ago.The principle involves a high potencial difference generated only for a short time in the special vacuum chamber,but not steady-state conditions.Now,we would like to discuss next problems:1.technicalities of the ballistic anode design,both for proton and heavy ion beams generation.2 pulse power multiplication.3.high current sources for charge pumping of the ballistic anode.4 experimental modelling.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
9-475 - Field Study of the 4T Superconducting Magnet for Rapid Cycling Heavy Ion Synchrotrons

Vladimir Mikhaylov, Pavel Akishin, Andrey Butenko, Alexander Kovalenko (JINR, Dubna, Moscow Region)

The problem of the magnetic field optimization of a 4T dipole magnet with circular aperture of 100-110 mm for rapid cycling synchrotron is considered. A single layer low inductance coil made of hollow superconducting high current cable operating at 30 kA is used. The magnetic field ramp rate up to 4 T/s should be achievable. Mathematical method to minimize sextupole and higher order non-linearities to the tolerable values by variation of angular coil turn position is developed. The results of numerical simulation for 2D part magnetic field are presented. The further possibilities to improve the field quality for similar lattice magnets and their application for heavy ion synchrotrons and boosters are discussed.

Work supported by Russian Foundation for Basic Research,

project No 03-01-00290



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
10-697 - Layout of the Storage Ring Complex of the International Accelerator Facility for Research with Ions and Antiprotons at GSI

Peter Beller, Karl Beckert, Alexei Dolinskii, Bernhard Franzke, Fritz Nolden, Claudius Peschke, Markus Steck (GSI, Darmstadt)

The storage ring complex of the new international accelerator facility consists of three different rings: the Collector Ring CR, the accumulator/decelerator ring RESR and the New Experimental Storage Ring NESR. The CR will serve for fast stochastic precooling of antiproton and rare isotope (RI) beams. Cooling time constants of about 100 ms for RI beams are envisaged. For experiments with RI beams the RESR serves as a decelerator ring. Precooled RI beams will be injected at 740 MeV/u and then decelerated to variable energies down to 100 MeV/u within about 1 s. The NESR will be the main instrument for nuclear and atomic physics. Besides experiments using an internal gas target, the NESR offers the possibility to collide circulating bunches of ions with electron bunches counter-propagating in a small 500 MeV electron storage ring. The physics program with antiprotons requires the accumulation of high intensity antiproton beams. The accumulation of 7×1010 antiprotons at 3 GeV per hour is foreseen. This will be accomplished by operating the RESR as an accumulator ring equipped with a stochastic cooling system. The NESR could then be used to decelerate antiprotons to 30 MeV.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
11-701 - Improved Performance of the Heavy Ion Storage Ring ESR

Markus Steck, Karl Beckert, Peter Beller, Bernhard Franczak, Bernhard Franzke, Fritz Nolden (GSI, Darmstadt)

The heavy ion storage ring ESR at GSI allows experiments with stable and radioactive heavy ions over a large range of energies. The energy range available for operation with completely stripped ions has recently been extended to energies as low as 3 MeV/u. Even for bare uranium such low energies can be provided by deceleration of the ions which are stripped to high charge states in a foil at energies of 300-400 MeV/u. After injection the beam is cooled and decelerated in an inverse synchrotron mode interspersed with electron cooling at an intermediate energy. At the lowest energy of 3 MeV/u some hundreds of thousands ions could be electron cooled after deceleration. At energies of 10-20 MeV/u physics experiments with stored and slowly extracted beam have been performed with some million decelerated cooled ions. The cooling of radioactive ions by a combination of stochastic pre-cooling and final electron cooling has been demonstrated. The hot fragment beam, which was injected at an energy of 400 MeV/u, was cooled in about 6 s to a quality useful for precision experiments.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
12-739 - Measurement of Activation Induced by Ar Beam in Copper Target

Alexander Fertman, Alexander Golubev, Mikhail Prokuronov, Boris Sharkov (ITEP, Moscow), Georg Fehrenbacher, Rainer Hasse, Ingo Hofmann, Edil Mustafin, Dieter Schardt, Karin Weyrich (GSI, Darmstadt)

Results of the measurement of activation induced by Argon beam with energies of E=100,200,800 MeV/u in the copper target are presented. The densities of various radioactive isotopes are derived from the measurements. Long-time prediction of radioactivity and accumulated doses in the accelerator equipment is calculated.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
13-744 - Radiation Damage to the Elements of the Nuclotron-type Dipole of SIS100

Nikolai Sobolevskiy, Ludmila Latysheva (RAS/INR, Moscow), Hiroshi Iwase, Gebhard Moritz, Edil Mustafin, Gertrud Walter (GSI, Darmstadt)

Radiation damage to various elements of the Nuclotron-type dipole of SIS100 sensitive to irradiation was calculated. Among the elements of consideration were the superconducting cables, insulating materials, ceramic insertions and high-current by-pass diodes. The Monte-Carlo particle transport code SHIELD was used to simulate propagation of the lost ions and protons together with the products of nuclear interactions in the material of the elements. The results for the proton projectiles were cross-checked using the particle transport code MARS, and a good agreement between the codes were found. It was found that the lifetime of the organic materials under irradiation are much more restrictive limit for the tolerable level of beam particle losses than the danger of the quench events.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
14-790 - High Intensity Uranium Operation in SIS18

Peter J. Spiller (GSI, Darmstadt)

For the present experiment program and the planned international accelerator facility at GSI, the space charge limit of SIS18 for highly(4x1010) and intermediate (2.7x1011) charged uranium ions shall be reached within the next four years. Furthermore, measures to increase the repetition- and ramp rate up to 4 Hz with 10 T/s have been progressed. The present state of intensities per cycle and the limitations will be described. In connection with the planned enhancement of heavy ion intensities, protection, interlock and diagnostic systems, especially for the injection- and extraction devices have been prepared. Special attention is drawn on the insights which were achieved with respect to the operation at dynamic vacuum conditions. Results of R&D work with the goal to increase the intensity threshold and to improve the beam life time will be summarized. Furthermore, the specific upgrade program and schedule for the SIS18 booster mode will be presented.



Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
15-798 - The LHC Lead Ion Injector Chain

Karlheinz Schindl, Andre Beuret, Alfred Blas, Jan Borburgh, Helmut Burkhardt, Christian Carli, Michel Chanel, Tony Fowler, Marine Gourber-Pace, Steven Hancock, Charles E. Hill, Michael Hourican, John Jowett, Karsten Kahle, Detlef Kuchler, Alessandra Maria Lombardi, Edgar Mahner, Django Manglunki, Michel Martini, Stephan Maury, Flemming Pedersen, Uli Raich, Carlo Rossi, Jean-Pierre Royer, Richard Scrivens, Luc Sermeus, Elena Shaposhnikova, Gerard Tranquille, Maurizio Vretenar, Thomas Zickler (CERN, Geneva)

A sizeable part of the LHC physics programme foresees heavy ion (lead-lead) collisions with a design luminosity of 10^27 cm-2 s-1. This will be achieved after an upgrade of the ion injector chain comprising Linac3, LEIR, PS and SPS machines. Each LHC ring will be filled in ~10 minutes with ~600 bunches, each of 7 10^7 Pb ions. Central to the scheme is the Low Energy Ion Ring (LEIR), which transforms long pulses from Linac3 to high-brilliance bunches by means of 6D multi-turn injection and accumulation via electron cooling. Major limitations along the chain, including space charge, intra-beam scattering, vacuum issues, and emittance preservation are highlighted. The conversion from LEAR (Low Energy Antiproton Ring) to LEIR includes new magnets and power converters, high-current electron cooling, broad-band RF cavities, upgraded beam diagnostics, and UHV vacuum equipment relying on beam scrubbing to achieve a few 10^-12 mbar. Major hardware changes in Linac3 (Electron Cyclotron Resonance source, repetition rate, energy ramping cavity), PS (new injection hardware, elaborate RF gymnastics, stripping insertion), and SPS (100 MHz system) are described. An early beam scenario, using fewer bunches but the same bunch intensity to deliver a lower luminosity, reduces the work required for LHC ion operation in spring 2008.

CERN, Geneva, Switzerland

Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
16-799 - Accelerator-Accumulator ITEP-TWAC Delivers Ion Beams to the Experiments

Boris Sharkov (ITEP, Moscow)

The powerful accelerator/accumulator facility ITEP-TWAC started to deliver the ion beams to the experiments in two operation modes. In ion acceleration mode up tp 10E9 of 4.3 GeV/u Carbon C6+ ions per sec are delivered. In ion accumulation mode the facility generates >10E10 C6+ ions per 170 ns pulse.

MINATOM of Russian Federation

Type of presentation requested: Poster

Classification: [A04] Low- and Intermediate-Energy Circular Accelerators
17-825 - Status of Fermilab Electron Cooling Project

Jerry Leibfritz, Daniel Robert Broemmelsiek, Alexey Burov, Kermit Carlson, Consolato Gattuso, Brian Kramper, Tom Kroc, Mike McGee, Sergei Nagaitsev, Lucy Nobrega, Greg Saewert, Chuck Schmidt, Alexander V. Shemyakin, Mary Sutherland, Vitali Tupikov, Arden Warner (Fermilab, Batavia, Illinois), Sergey Seletsky (Rochester University, Rochester, New York)

Fermilab has constructed and commissioned a full-scale prototype of a multi-MV electron cooling system to be installed in the 8.9 GeV/c Fermilab Recycler ring. This prototype was used to test all of the electron beam properties needed for cooling. However, because the prototype is not located within proximity of the Recycler ring, the actual electron cooling of antiprotons can not be demonstrated until it is relocated. The Fermilab electron cooling R&D project is scheduled to be completed in May, 2004 at which time it will be disassembled and relocated to a newly constructed facility where it will be installed in the Recycler. This paper describes the experimental results obtained with the prototype cooler system, gives an overview of the new electron cooling facility, and discusses the overall status of the project.

Operated by Universities Research Association, Inc., under Contract No. DE-AC02-76CH03000 with the U.S. Department of Energy

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