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| MOPC139 |
Refractory Ovens for ECR Ion Sources and Their Scaling
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397 |
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- M. Cavenago, A. Galatà, M. Sattin
INFN/LNL, Legnaro, Padova
- T. Kulevoy, S. Petrenko
ITEP, Moscow
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The radiofrequency (rf) oven can be used as a metal vapour injector for Electron Cyclotron Resonance ion source; the application to high temperature boiling metals (like Cr, Ti and V) was recently demonstrated. Duration and reusability of oven parts were excellent, since crucible only need to be maintained at a temperature Ts larger than other parts; for vanadium case, achieved Ts was up to 2300 K with about 280 W of rf power, with the present design and size, tailored to our 14.4 GHz ECRIS. Optimization for different sources is discussed, and modern design tools are reviewed. Materials, more than rf power coupling, emerge as ultimate limits. Comparisons of results with resistive oven and sputter probes and with different metals are briefly reported.
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| MOPC140 |
Status of the Multipurpose Fully Superconducting ECR Ion Source
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400 |
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- G. Ciavola, L. Celona, S. Gammino, F. Maimone, D. Mascali
INFN/LNS, Catania
- H. A. Koivisto
JYFL, Jyvaskyla
- R. Lang, J. Maeder, J. Rossbach, P. Spaedtke, K. Tinschert
GSI, Darmstadt
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The MSECRIS source has been designed with the aim to exceed the highest currents of highly charged heavy ions available up to now. It is based on a minimum B trap made of a hexapole and three solenoids. The design magnetic field is 2.7 T for the hexapole and 4.5 T for the mirror field, in order to permit to operate not only at 28 GHz but also at higher frequency, thus increasing the plasma density and finally the beam current. Such high level of magnetic field is a challenge because of the forces arising on the superconducting coils and it largely exceeds the highest magnetic field available for existing ECRIS. A description of the source and of its preliminary results will be given. The source has been built in the frame of the European collaboration EURONS/JRA07-ISIBHI and it is now installed at the EIS testbench of GSI.
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| MOPC141 |
Design of a Novel Tubular Electron String Ion Source (TESIS)
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403 |
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- E. Syresin, D. E. Donets, E. D. Donets, E. E. Donets, V. B. Shutov
JINR, Dubna, Moscow Region
- V. M. Drobin, A. V. Shabunov, Yu. A. Shishov
JINR/LHE, Moscow
- A. E. Dubinov, R. M. Garipov, I. V. Makarov
VNIIEF, Sarov (Nizhnii Gorod)
- L. Liljeby
MSL, Stockholm
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The project, started in 2007 is directed to creation of Tubular Electron String Ion Source (TESIS) and to basic studies of electron strings in tubular geometry. The collaboration consists of JINR (Dubna) and Russian Federal Nuclear Center (Sarov, Russia), Manne Siegbahn Laboratory (Stockholm, Sweden), TRIUMF and Atomic Energy of Canada Ltd. (Canada). Tubular concept of ion source has been proposed few years ago*. Preliminary theoretical estimations and numerical simulations have been done**,*** that allowed to start experimental realization of this project. New tubular source with a superconducting solenoid up to 5 Tesla should be constructed in 2009. It is expected that this new TESIS (“Krion-T1”) will meet all rigid conceptual and technological requirements and should provide ion output on a level, approaching to 10 mA of Ar16+ ions in the pulse mode and about 10 mA of Ar16+ ions in the average current mode. Having these output parameters, “Krion-T1” TESIS should be an operational prototype of further TESIS sources for all kinds of the possible applications. Simulation results and a basic scetch of the TESIS construction will be presented.
*Donets E. D. et al. Rev. Sci. Instrum. 73, 696 (2002).
**Donets E. D., Donets E. E., Becker R. et al. Rev. Sci. Instrum.75, 1566 (2004).
***Donets E. E. J. of Phys.: Conf. Series 2, 97 (2004).
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| MOPC142 |
Study of the Post Extraction Acceleration Gap in the ISIS H- Penning Ion Source
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406 |
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- D. C. Faircloth, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The injection energy into the RFQ will be in the range of 50 to 70 keV whereas the standard ISIS H- Penning ion source operates at 35 keV, therefore the post extraction acceleration voltage must be increased. In order to finalise the design of the FETS post extraction system, a study is conducted on the Ion Source Development Rig (ISDR) at ISIS. This study shows how beam transport is affected by different post extraction acceleration voltages and gap lengths. Beam, current, profile and emittance measurements are presented along with theoretical calculations.
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| MOPC143 |
Multi-beamlet Study of Beam Transport in the ISIS H- Ion Source Analysing Magnet
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409 |
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- D. C. Faircloth, S. R. Lawrie, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). The existing 90° analysing magnet on the ISIS H- Penning ion source does not perfectly transport the beam after extraction. The present ion source has a 10 mm x 0.6 mm slit extraction aperture. To understand how the beam is transported in the analysing magnet, new ion source aperture plates are manufactured with 5 individual holes instead of a slit. These holes produce separate beamlets that are used to study transport in the sector magnet. This paper details the experiments with the modified aperture plates on the Ion Source Development Rig (ISDR) at ISIS.
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| MOPC144 |
Installation of the Front End Test Stand High Performance H- Ion Source at RAL
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412 |
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- D. C. Faircloth, M. H. Bates, S. R. Lawrie, A. P. Letchford, M. Perkins, M. E. Westall, M. Whitehead, P. Wise, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. K. Pozimski, P. Savage
Imperial College of Science and Technology, Department of Physics, London
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The RAL Front End Test Stand (FETS) is being constructed to demonstrate a chopped H- beam of up to 60 mA at 3 MeV with 50 pps and sufficiently high beam quality for future high-power proton accelerators (HPPA). This paper details the first stage of construction- the installation of the ion source.
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| MOPC145 |
Commissioning of the ECR Ion Sources at CNAO Facility
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415 |
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- G. Ciavola, L. Celona, S. Gammino, F. Maimone
INFN/LNS, Catania
- C. Bieth, W. Bougy, G. Gaubert, O. Tasset, A. C.C. Villari
PANTECHNIK, BAYEUX
- A. Galatà
INFN/LNL, Legnaro, Padova
- R. Monferrato, M. Pullia
CNAO Foundation, Milan
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The Centro Nazionale di Adroterapia Oncologica (National Center for Oncological Hadrontherapy, CNAO) is the Italian center for deep hadrontherapy. It will deliver treatments with active scanning both with proton and carbon ion beams. At CNAO two ECR sources of the Supernanogan type (built by the Pantechnik company according to specifications set by INFN) are installed and run continuously and in parallel, to allow the fast change of the particle species. The two sources are identical and can provide both particle species after a simple switch from one gas to the other, which allows as well to run the facility, in emergency, with only one source. Each source is equipped with a dedicated beam line including a spectrometer and beam diagnostics. Optimisation of beam emittance and intensity is of primary importance to obtain the necessary current at the RFQ-LINAC and then at injection. The preliminary tests have shown the complete fulfillment of the specifications in terms of beam current and emittance and the final tests are ongoing. A description of the source design and performance will be presented.
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| MOPC146 |
Development of Piezoelectric Pulse Gas Valve for Small ECR Ion Source
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418 |
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- M. Ichikawa, H. Fujisawa, Y. Iwashita, Y. Tajima, H. Tongu, M. Yamada
Kyoto ICR, Uji, Kyoto
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In a conventional ion source, the source gas is continuously fed even in its pulse operation. This requires a high load to a vacuum pumping system. The situation is prominent when the gas load is relatively higher in such a high current ion source. In order to improve this situation, we try to supply gas only when it is needed by synchronizing the gas feed with the extraction of the ion beam. We have developed a small pulse-gas-valve using a commercially available disc-shape piezoelectric element. This valve is small enough to be mounted in our ECR ion source and is capable of very fast open-and-close operation of an order of kHz repetition. A small ECR ion source with this valve will be presented.
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| MOPC147 |
Measurement of Ion Beam from Laser Ion Source for RHIC EBIS
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421 |
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- T. Kanesue
Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka
- M. Okamura
BNL, Upton, Long Island, New York
- J. Tamura
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama
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Laser ion source (LIS) is a candidate of the primary ion source for the RHIC EBIS. LIS will provide intense charge state 1+ ions to EBIS for further ionization. We measured plasma properties of a variety of atomic species such as Si, Fe and Au using the second harmonics of Nd:YAG laser (532 nm wave length, up to 0.82 J / 6 ns). Since a suitable laser power density for production of charge state 1+ ions is different from different species, laser power density was optimized to obtain a maximum beam intensity in each species. Also the results of emittance measurement using pepper pot after ion extraction with about 20 kV extraction voltage will be shown. Based on the obtained results, performance of the LIS as the primary ion source for EBIS will be discussed in this paper.
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| MOPC148 |
Target Life Time of Laser Ion Source for Low Charge State Ion Production
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424 |
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- T. Kanesue
Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka
- M. Okamura
BNL, Upton, Long Island, New York
- J. Tamura
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama
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Laser ion source produces ions by irradiating pulsed laser shots onto the solid state target. For the low charge state ion production, laser spot diameter on the target can be over several millimeters using the high power laser such as Nd:YAG laser (532 nm wave length, 0.82 J / 6 ns). In this case, damages to the target surface is small while there is a visible crater in case of the best focused laser shot (laser spot diameter can be several tens of micrometers) for high charge state ion production. Because damage to the target surface is small, target is not required to be moved to use fresh surface after each laser shot to stabilize plasma. In this paper, the results of target life time measurements will be shown.
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| MOPC150 |
Modifications to the Analysing Magnet in the ISIS Penning Ion Source
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427 |
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- S. R. Lawrie, D. C. Faircloth, A. P. Letchford, M. E. Westall, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- J. K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon
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A full 3D electromagnetic finite element analysis and particle tracking study is undertaken of the ISIS Penning surface plasma ion source using CST Particle Studio 2008. The existing 90° analysing magnet is found to have a magnetic field index of 1.3, causing beam divergence and contributing to beam loss. Different magnet pole piece geometries are modelled and the effect of space charge investigated. Based on this modelling, three new sets of poles are manufactured and tested on the Ion Source Development Rig. The results are presented herein.
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| MOPC151 |
Status of the Versatile Ion Source VIS
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430 |
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- F. Maimone, L. Celona, F. Chines, G. Ciavola, G. Gallo, N. Gambino, S. Gammino, D. Mascali, R. Miracoli, S. Passarello, E. Zappalà
INFN/LNS, Catania
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The characteristics of the ideal injector for high power proton accelerators has been studied in the past with the TRIPS ion source built at INFN-LNS, Catania and now in operation at INFN-LNL, Legnaro. The beam production must obey to the request of high brightness, stability and reliability. The new Versatile Ion Source (VIS) is a permanent magnet version of the TRIPS source with a simplified and robust extraction system. It operates up to 80 kV without a bulky high voltage platform, producing multi-mA beams of protons and H2+. The description of the source design and the preliminary performance will be presented. An outline of the forthcoming developments is given, with particular care to the use of a low loss dc break and to the use of a travelling wave tube amplifier to get an optimum matching between the microwave generator and the plasma.
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| MOPC153 |
Construction and Test of the Superconducting Coils for RIKEN SC-ECR Ion Source
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433 |
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- J. Ohnishi, A. Goto, Y. Higurashi, K. Kusaka, T. Nakagawa, H. Okuno
RIKEN, Wako, Saitama
- T. Minato
Mitsubishi Electric Corp., Energy Systems Centre, Kobe
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A superconducting ECR ion source is under development to increase the intensity of the beams with high charge state such as U35+ provided to the RI-beam factory at RIKEN. The ion source consists of six superconducting solenoids and a set of superconducting sextupoles. The axial magnetic fields are 3.8 T at the injection peak and 2.2 T at the extraction peak. The sextupole magnetic field is 2.0 T on the inner surface of the plasma chamber with a diameter of 15 cm. The conductors use NbTi/copper wires with copper/SC ratio of 1.3 and size of 1.25 mm x 0.92 mm. The sextupole coils are difficult to design and fabricate because the maximum experience magnetic field is about 7.3 T and the magnetic force acting on the coils changes by the strength of the radial field of the solenoids along the axis. The design, construction and the results of the excitation test will be presented in this paper.
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| MOPC154 |
Method for Efficiency and Time Response Measurement on Diverse Target Ion Sources with Stable Alkali
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436 |
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- A. Pichard, J. A. Alcantara Nunez, R. Alves Conde, M. Dubois, R. Frigot, P. Jardin, P. Lecomte, J. Y. Pacquet, M. G. Saint-Laurent
GANIL, Caen
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Developments of new setups for radioactive ion beam production by the isotope-separator-on-line (ISOL) method are underway at GANIL in the frame of the SPIRAL (Système de Production d’Ions Radioactifs Accélérés en Ligne) and SPIRAL-II projects. The measurement of total efficiency and time behaviour of these new target/ion-source systems (TISSs) is a crucial step for these devices which aims to produce short-lived isotopes with high intensity. The overall atom-to-ion transformation efficiency depends on several processes: diffusion of the atoms out of the production target, effusion towards the ion source and ionization. The efficiency can be extracted using the ratio between the emerging yield and implanted flux in the TISS. Several methods have already been developed to achieve these measurements: the use of stable or radioactive beams, gas injection, or the introduction of solid material into the TISS. This paper focuses primarily on a method that uses stable alkali. A pulsed/CW alkali ion gun has been built and will be used to optimise diverse TISSs.
[1] C. Eléon et al., Proceedings of the XVe International Conference EMIS, 24-29th June 2007, Deauville, France, to be published.
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| MOPC155 |
Transport System for Ion Implantation
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439 |
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- S. M. Polozov, E. S. Masunov
MEPhI, Moscow
- R. P. Kuibeda, T. Kulevoy, V. Pershin, S. Petrenko, D. N. Selesnev, I. M. Shamailov, A. L. Sitnikov
ITEP, Moscow
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ITEP in collaboration with MEPHI and IHE (Tomsk) develops the high intensity ion beam generation and transport systems for low energy (1-50 keV) ion implantation. Such facilities are used for semiconductor technology. The Bernas type ion source is used for ribbon ion beam production. The periodical system of electrostatic lenses (electrostatical undulator) was proposed for ribbon beam transport line. The design of transport system and the results of beam dynamics investigation are presented. The influence of the electrodes construction errors on the beam dynamics is discussed.
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| MOPC156 |
ECR Ion Source for the KEK All-ion Accelerator
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442 |
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- H. Suzuki, Y. Arakida, T. Iwashita, M. Kawai, T. Kono, K. Takayama
KEK, Ibaraki
- S. I. Inagaki
Kyushu University
- K. Okazaki
Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture
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R&D works to realize an all-ion accelerator (AIA)* -capable of accelerating all ions of any possible charge state, based on the induction synchrotron concept, which was demonstrated using the KEK 12 GeV-PS**, are going on. As an ion source for the KEK-AIA, an electron cyclotron resonance (ECR) ion source has been developed. Permanent magnets made of NdFeB to generate a cusp field and 9.4 GHz microwave to energize plasma electrons have been employed. The microwave power of 750 W generated in a traveling wave tube is focused into the interaction region with a horn antenna. Regarding the cut off density for 9.4 GHz, the vacuum and the gas feeding system has been designed. The base pressure of 1·10-5 Pa is reached with a single turbo molecular pump of 300 l/min, and the gas flow rate less than 1 cc/min is maintained with a mass flow controller. The plasma chamber is water-cooled against Joule heating. The geometry of the extraction electrodes and the downstream transport line have been optimized by IGUN simulations. The whole system will be embedded in the high voltage terminal box of 200 kV. Details of the design and the preliminary test will be described at this conference.
*K. Takayama, Y. Arakida, T. Iwashita, Y. Shimosaki, T. Dixit, and K. Torikai, J. of Appl. Phys. 101, 063304 (2007).
**K. Takayama et al., Phys. Rev. Lett. 98, 054801 (2007).
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| TUOBM03 |
High-Intensity Polarized H- (Proton), Deuteron and 3He++ Ion Source Development at BNL
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1010 |
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- A. Zelenski, J. G. Alessi, A. Kponou, D. Raparia
BNL, Upton, Long Island, New York
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New techniques for production of polarized H- (protons), deuteron and 3He++ ion beams (based on optical pumping polarization method) will be discussed. Feasibility studies of these techniques are in progress at BNL. The depolarization factors in the multi-step spin-transfer polarization technique and basic limitations on maximum polarization in the OPPIS (Optically-Pumped Polarized H- Ion Source) will be discussed. Detailed studies of polarization losses in the RHIC OPPIS and the source parameters optimization resulted in the OPPIS polarization increase to 86-90%. This contributed to AGS and RHIC polarization increase to 65-70%.
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Slides
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