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




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Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
76-263 - Improved Electron Cyclotron Resonance Ion/ Plasma Device Using Novel Cusp Mirror Magnetic Field

Md Haroon Rashid, Rakesh Bhandari, Chaturanan Mallik (DAE/VECC, Calcutta)

Sufficient beams of the Highly Charged Heavy Ion (HCHI) have been obtained using some techniques in conventional electron cyclotron resonance ion sources (ECRIS) but at the cost of simplicity and economy. Many workers identified that the cusp magnetic field (CMF) was the best as it has more confining feature but a little current of HCHIs extracted practically. The CMF has been reconfigured adopting a simple, novel and cost-effective novel technique. It uses a pair of concentric coils either normal-conducting or super-conducting and a highly permeable mid-iron disk for the field due to coil system or available permanent magnet having very high remanence and coercivity. It can be designed now for higher microwave frequencies for high-B mode operation of the cusp ECRIS. The novel CMF at the cusp positions is referred to a theory of equilibrium, which takes into account mirror reflection of particles. A system of two ion-sources used for RIB production may not be required now. It can be designed without having any permanent magnet either. Now it is possible to place a cusp ECRIS near the thick target for ionizing the effusing out radioactive fragments to high charge-state. A simple design of 14.4 GHz cusp mirror ECRIS and a scheme of obtaining highly charged RIB will be finally discussed. This technique can herald a new epoch for development of ECR ion/ plasma device for many advantageous applications.



Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
77-285 - Design of the Magnetic Structure of ECR Ion Source NANOGUN-10B

Juraj Pivarc (IP SAS, Bratislava), Mohamed El-Shazly, Alexander Tikhomirov (JINR, Dubna, Moscow Region)

The magnetic structure of new 10 GHz ECR ion source NANOGUN-10B is described. Small permanent magnets are used for construction of suitable hexapole and axial magnetic structure. Permanent magnets are made from FeNdB with a remanence of 1.1 T. The hexapole consists of 24 trapezoidal segments. The axial magnetic structure is designed of 7 slices of FeNdB permanent magnets defining a magnetic field of 0.58 T in the extraction and 0.77 T near the injection of the UHF area. The magnetic structure internal diameter is 36 mm and the external diameter is 200 mm. The total weight of the magnetic structure is about 36 kg.



Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
78-453 - Production and Transport of Radioactive Francium for Magneto-optical Trapping

Giulio Stancari (UNIFE, Ferrara; INFN/LNL, Legnaro, Padova)

An innovative facility for the production and trapping of francium isotopes is operating at the INFN laboratories in Legnaro, Italy. The goal is to obtain a dense cloud of cold and possibly polarized radioactive atoms for a wide range of fundamental studies. Among them are high-resolution laser spectroscopy, alpha-decay asymmetries from deformed nuclei, and tests of the standard model at low transferred momenta. The production of francium is achieved by sending a 100-MeV oxygen-18 beam from the Tandem-XTU accelerator on a thick gold target. The extraction of Fr+ is enhanced by heating the target to 1200 K and by biasing it at +3 kV. The ions are transported to the magneto-optical trap (MOT) through a 7-m electrostatic beam line. The diagnostic systems for monitoring the beam intensity (10^5 ions/s) are based on silicon detectors sensitive to the alpha particles from Fr decays. Beams of stable Rb+ can also be used for optimizing the transport and trapping processes. Prior to injection into the MOT the beam is neutralized and released in atomic form by a heated yttrium or zirconium foil. Details on the production, transport and neutralization processes are presented.

Istituto Nazionale di Fisica Nucleare (INFN)

Istituto Nazionale di Fisica della Materia (INFM)

Universita` degli Studi di Ferrara

Universita` degli Studi di Pisa

Universita` degli Studi di Siena
Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
79-499 - Beams from RF Ovens and ECR Ion Sources

Marco Cavenago (INFN/LNL, Legnaro, Padova), Timur Kulevoy, Sergey Petrenko (ITEP, Moscow)

Beam of silver, copper and recently platinum were produced with the radiofrequency oven technique. The ECRIS (Electron Cyclotron Resonance Ion Source) can be conveniently considered as a charge breeder for any injection device; this approach allows to compare the injection of metals from ovens with other techniques discussed in the literature, like the injection from mevva (Metal Vapor Vacuum Arc) sources or the injection of single charged RIB (radioactive ion beams) or the simple injection of heavy gas. Extensive experiments extracting beams of copper (charge up 13+) or silver (charge up to 19+) or xenon (charge up 20+) with the same ECRIS condition are described, and advantage of rf oven over gas injection are discussed; in particular the oven crucible can be easily voltage biased up to -400 V, to modify ECRIS plasma shape. Heating the tantalum crucibles over 2300 K (average temperature) requires careful axial alignment to avoid the formation of hot spots; preliminary evidence of this effect and its numerical modeling are also described.

INFN

Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
80-1125 - ECRIS Development for the SPIRAL II Project

Pascal Sortais, Jean-Claude Curdy, Thierry Lamy, Patrick Sole, Thomas Thuillier, Jean-Louis Vieux-Rochaz, Didier Voulot (LPSC, Grenoble)

The SSI/LPSC laboratory is involved in the development of high intensity sources for the driver accelerator and on the improvements of a charge breeding system for its operation inside an highly radioactive environment. We will present the results obtained for the qualification of a 5 mAe/40 KV beam of Deuteron ions dedicated to the feeding of the driver. Concerning the heavy ions, the source PHOENIX 18/28 GHz has been chosen as injector of the driver. The optimization of the source is done in order to produce reliable beams of 1mAe / O6+ and 0.3 mAe of Ar12+ at 60 KV. Theses developments are presently done with the room temperature version of PHOENIX (including a new version of the hexapole of the source). In parallel, an upgrade version of PHOENIX, using HTS coils, is under construction and is dedicated to production of very high intensity of the Argon ions (up to 1 mAe of Ar12+). A charge breeding system is also under qualification. The PHOENIX Booster source confirms that efficiency for mass around hundred can reach up to 6%. Now the efforts consist in precisely defining the 1+ beam matching for charge breeding tuning of the source (emittance measurements).



Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
81-1359 - Production of Radioactive Ion Beams for the EXCYT Facility

Mariano Menna, Cuttone, Maurizio Re (INFN/LNS, Catania)

The EXCYT facility (EXotics with CYclotron and Tandem) at the INFN-LNS is based on a K-800 Superconducting Cyclotron injecting stable heavy-ion beams (up to 80 MeV/amu, 1 emA) into a target-ion source assembly to produce the required nuclear species, and on a 15 MV Tandem for post-accelerating the radioactive beams. After thermal ANSYS simulations, during May 2003 the Target-Ion Source assembly (TIS) was successfully tested at GANIL under the same operational conditions that will be initially used at EXCYT. Yields and production efficiencies for 8,9Li were compatible with the ones obtained at SPIRAL. Following suggestions by the Referees? and the LNS Research Division, we decided to deliver 8Li as the first EXCYT radioactive beam (primary beam 13C, 18O or 15N). This choice also takes in account the availability of Magnex in 2004 as well as the requests and the first results obtained by the Big Bang collaboration. The commissioning of the EXCYT facility is foreseen by the end of 2004 together with the start of nuclear experiments program. In this poster we also report prospective ion beams currently in development.



Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
82-1489 - Development of the EBIS-based Preinjector for RHIC at BNL

Edward Beebe, James Alessi, Ahovi Kponou, Alexander I. Pikin, Krsto Prelec, Deepak Raparia (BNL, Upton, Long Island, New York)

The RHIC requirement for an electron beam ion source (EBIS) is about 3E9 particles/pulse of Au32+ ions in 10-40 microsecond pulses [*], and can be met using a 10A electron beam with a space charge neutralization by confined ions of 50%. As a result of experiments on a test EBIS having the full electron beam power and ~1/2 of the trap length of an EBIS for RHIC, we are confident that an EBIS meeting RHIC requirements can be built. Most design goals have been exceeded including electron beam current, ion charge state, total ion charge (scaled for length), confinement period requirements, charge purity requirements and relative abundance. Normalized rms emittance values for 1-3mA extracted ion beams have been in the range of 0.08-0.1 pi mm mrad. Present development of the source is limited to reliability and facilitating future upgrades in ion intensity and species, since the major emphasis is now on integrating the EBIS into a pre-injector facility, including an RFQ and linac; i.e., efficient injection of low-charged seed ions and low energy transport of intense beams of highly charged ions from the EBIS to the RFQ.

This work is performed under the auspices of the U.S. Department of Energy

* H. Haseroth and K. Prelec, Physica Scripta T71, 23 (1997)



Type of presentation requested: Poster

Classification: [T01] Proton and Ion Sources
83-82 - Performance of a CW RFQ Injector for the IUCF Cyclotron

Dennis Friesel, Vladimir Peter Derenchuk (IUCF, Bloomington, Indiana)

A 750 keV RFQ proton pre-injector was installed in place of a 600 keV Cockroft-Walton high voltage terminal for the IUCF k220 Cyclotron. The pre-injector consists of a 20 keV microwave ion source and LEBT, a unique design 750 keV CW RFQ, and a short transfer beam line to the k15 injector cyclotron center region. Modifications to the K15 cyclotron injection system were also required to accept beam from the RFQ. This pre-injector system was installed and commissioned in June of 2003 and is now in routine service as the sole injection system to the cyclotrons. This contribution will discuss the performance of the CW RFQ pre-injector and the transmission properties of the beam through the cyclotrons.

Indiana University, Bloomington, IN 47468

Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
84-330 - Proton Beam Line for the ISIS Second Target Station

Dean Adams (CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon)

The ISIS facility, based at the Rutherford Appleton Laboratory in the UK, is an intense pulsed source of Muons and Neutrons used for condensed matter research. The accelerator facility delivers an 800 MeV proton beam of 2.5x1013 protons per pulse at 50 Hz. As part of the facility upgrade, which includes increasing the source intensity to 3.7x1013 protons per pulse using a dual harmonic RF system, it is planned to share the source with a second, 10 Hz, target station. A beam line supplying this target will extract from the existing target station beam line. Measurements and models characterising the optical functions around the extraction point of the existing line are discussed. The optical design, diagnostics and beam correction systems for second target station beam line are presented.



Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
85-661 - Possibilities for Experiments with Rare Radioactive Ions in a Storage Ring Using Individual Injection

Anatoly Olegovich Sidorin (JINR, Dubna, Moscow Region; JINR, Dubna, Moscow Region), Takeshi Katayama (CNS, Saitama), Wolfgang Mittig (GANIL, Caen), Igor Meshkov, Alexander Smirnov, Evgeny Syresin, Grigory Troubnikov (JINR, Dubna, Moscow Region), James R. Lewandowski (SLAC/ARDA, Menlo Park, California)

A radioactive ion beam produced at a target bombarded with a primary beam has after a fragment separator a relatively large emittance and small production rate. For instance, typical flux of 132Sn isotope at the exit of fragment-separator is about 5×10^5 ions/s. Conventionally used scheme of the ion storage in a ring based on multitutrn injection and (or) RF stacking and stochastic cooling application can not provide a high storage rate at so pure intensity especially for short lived isotopes. In this report we discuss an alternative storage scheme which is oriented to the continuous ion beam from fragment separator at production rate of 104 ions/s or even less. It is based on the fact, that at low production rate the parameters of each particle can be measured individually with rather high accuracy. The particle trajectory can be individually corrected in a transfer channel from fragment separator to the storage ring using system of fast kickers. A fast kicker in the ring synchronized with a circulating bunch provides continuous injection of the ions. The scheme permits to store the ion number required for precise mass measurements and internal target experiment. A hope to obtain large luminosity of ion-electron collisions is related with a possibility of the ion beam crystallization at small particle number.

This work is supported by RFBR grant #02-02-19611

Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
86-840 - Comparative Design Studies of a Super Buncher for the PSI 72 MeV Injection Line of the PSI Main Cyclotron

Jean-Yves Raguin, Andreas Adelmann, Markus Bopp, Hansruedi Fitze, Marco Pedrozzi, Pierre A Schmelzbach, Peter Sigg (PSI, Villigen)

The envisaged current upgrade from 2 to 3 mA of the PSI 590-MeV main cyclotron requires an increase of the global accelerating voltage of the 50-MHz cavities which leads to a nearly unacceptable RF requirement for the 150-MHz flattop cavity. In order to preserve the longitudinal acceptance and transmission of the machine while relaxing the high demands on the flattop system, it is conceivable to install a buncher in the 72-MeV injection line. To this end, normal-conducting 150-MHz half-wave resonators and 500-MHz two-gap spoke resonators have been designed and optimised for minimum input power and peak surface fields. The dependence of the RF properties, like Q0, R/Q and peak fields, with beam apertures and gap voltages compatible with beam-dynamics requirements are presented.



Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
87-915 - Mini-bunched and Micro-bunched Slow Extracted Beams from the AGS

Kevin A. Brown, Joseph Glenn, Mike Sivertz, Nicholaos Tsoupas (BNL, Upton, Long Island, New York), Shane Rupert Koscielniak (TRIUMF, Vancouver)

BNL's AGS has a long history of providing slow extracted proton beams to fixed target experiments. This program of providing high quality high intensity beams continues with two new experiments currently being designed for operation at the AGS; both of these new experiments require slow extracted beam, but with an added requirement of those beams experiments require slow extracted beam, but with an added requirement of those beams experiments and initial tests have been performed. In this report we will describe the beam requirements for the two experiments, and present results of detailed simulations and initial beam tests.

Work performed under the auspices of the US Department of Energy

Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
88-916 - Results of the First Run of the NASA Space Radiation Laboratory at BNL

Kevin A. Brown, Leif Ahrens, Joseph Michael Brennan, Chris Gardner, David Gassner, Joseph Glenn, Y. Kotlyar, Ioannis Marneris, Adam Rusek, Nicholaos Tsoupas, K. Zeno (BNL, Upton, Long Island, New York)

The NASA Space Radiation Laboratory (NSRL) was constructed in collaboration with NASA for the purpose of performing radiation effect studies for the NASA space program. The results of commissioning of this new facility were reported in [*]. In this report we will describe the results of the first run. The NSRL makes use of heavy ions in the range of 0.05 to 3 GeV/n slow extracted from BNL's AGS Booster. Many modes of operation were explored during the first run, demonstrating all the capabilities designed into the system. Heavy ion intensities from 100 particles per pulse up to $2\times10^9$ particles per pulse were delivered to a large variety of experiments, providing a dose range up to 70 G/min over a 5x5 $cm^2$ area. Results presented will include those related to the production of beams that are highly uniform in both the transverse and longitudinal planes of motion [**].

Work performed under the auspices of the US Department of Energy

* K.A.Brown, et al, ``Commissioning Results of Slow Extraction of Heavy Ions from the AGS Booster``, Proceedings of the 2003 Particle Accelerator Conference, Portland, OR, 2003

** N.Tsoupas, et al, ``Commissioning of the Beam Transfer Line of the Booster

Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
89-917 - Results of the NASA Space Radiation Laboratory Beam Studies Program at BNL

Kevin A. Brown, Leif Ahrens, I-Hung Chiang, David Gassner, David Phillips, Adam Rusek, Nicholaos Tsoupas, K. Zeno (BNL, Upton, Long Island, New York)

The NASA Space Radiation Laboratory (NSRL) was constructed in collaboration with NASA for the purpose of performing radiation effect studies for the NASA space program. The NSRL makes use of heavy ions in the range of 0.05 to 3 GeV/n slow extracted from BNL's AGS Booster. The purpose of the NSRL beam studies program is to develop a clear understanding of the beams delivered to the facility, to fully characterize those beams, and to develop new capabilities in the interest of understanding the radiation environment in space. In this report we will describe the first results from this program.

Work performed under the auspices of the US Department of Energy

Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
90-977 - Generation of a Femtosecond Electron Beam for Nanoscience and Nanotechnology

Jinfeng Yang (RCNP, Osaka), Yang Jinfeng (ISIR, )

A new S-band femtosecond electron linear accelerator was developed in Osaka University for the study of radiation-induced ultrafast physical and chemical reactions in femtosecond time regions. The femtosecond electron accelerator was constructed with a laser driven photocathode RF gun, a linear accelerator (linac) and a magnetic pulse compressor. The RF gun was driven by a mode-locked Nd:YLF picosecond laser. The electron beam produced by the RF gun was accelerated in the linac with energy modulattion by adjusted the RF phase. The magnetic pulse compression, which was constructed with two 45o-bending magnets and four quadrupole magnets, is a technique to longitudinally focus a charged beam by rotating the phase space distribution in a magnetic field. The picosecond electron pulse, which was generated in the RF gun and accelerated in the linac with energy modulation, was compressed into femtosecond by adjusted the quadrupole magnetic fields. The femtosecond electron pulse is expected for the studies of ultrafast reactions in nano-space.



Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
91-1053 - Review of ISOL-type Radioactive Beam Facilities

Mats Lindroos (CERN, Geneva)

The ISOL technique was invented in Copenhagen over 50 years ago and eventually migrated to CERN where a suitable proton drive beam was available at the Syncho-Cyclotron. The quick spread of the technique from CERN to many other laboratories has resulted in a large user community, which has assured the continued development of the method, physics in the front-line of fundamental research and the application of the method to many applied sciences. The technique is today established as one of the main techniques for on-line isotope production of high intensity and high quality beams. The thick targets used allows the production of unmatched high intensity radioactive beams. The fact that the ions are produced at rest makes it ideally suitable for low energy experiments and for post acceleration using well established accelerator techniques. The many different versions of the technique will be discussed and the many facilities spread all over the world will be reviewed. The major developments at the existing facilities and the challenges encountered will be presented. Finally, the possibility of using the resulting high intensity beams for the production of intense neutrino beams will be briefly discussed.



Type of presentation requested: This is an Invited Oral Presentation

Classification: [T12] Beam Injection/Extraction and Transport
92-1058 - Design of a Muon Source for the Muon Ionisation Cooling Experiment

Kevin Tilley (CCLRC/RAL/ISIS, Chilton, Didcot, Oxon)

The MICE collaboration proposes to install a Muon Ionisation Cooling Experiment at the ISIS facility, at Rutherford Appleton Laboratory. This experiment will be the first demonstration of ionisation cooling as a means to reduce the large transverse emittance of the muon beam, produced during the early stages of a neutrino factory. In order to permit a realistic demonstration of cooling, a source of muons must be produced, possessing particular qualities, notably in emittance and momenta. This paper describes the present design for the muon beamline source, and the plans for its implementation at RAL.



Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
93-1107 - Beam Injection and First Orbit for 2, 4 and 6 RF Harmonic Mode at the Central Region of DC-72 Cyclotron.

Ivan Ivanenko, Georgy Gulbekyan (JINR, Dubna, Moscow Region)

The DC-72 cyclotron is designed to accelerate ions with A/Z from 1(H-) to 7.167 (129Xe18+) up to a final energy of 72 MeV/A and 2.7MeV/A, respectively. To cover all cyclotron-working regimes, the RF system keeps up 2, 4 and 6 harmonic modes. The optimal design of cyclotron center for acceleration of the ion beams at 2, 4 and 6 RF harmonic modes are investigated. The computation of orbits is carried out by means of the computer code CENTR.



Type of presentation requested: Poster

Classification: [T12] Beam Injection/Extraction and Transport
94-1134 - Beam Dynamics Studies for the Low Energy Section at MAFF

Matteo Pasini (LMU, Garching), Alexander Bechtold, Alwin Schempp (IAP, Frankfurt-am-Main), Dietrich Habs, Oliver Kester (LMU, München)

For the LINAC of the Munich accelerator for fission fragments (MAFF) a new scheme for the low energy section has been proposed in order to fulfill new experimental requirements, such as time spacing between bunches and low longitudinal emittance. The proposed solution consists in a combination of an external multi-harmonic buncher with a "traditional" RFQ with a shaper and an adiabatic bunching section included where the employment of the external buncher is upon request from the experiment. The matching section downstream the RFQ has been re-designed in order to allow room for the installation of a beam cleaning section and to a proper injection into the following DTL. Details about the optics and beam dynamics studies of the low energy section are presented in this paper.

Work supported by the DFG

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