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| MOCO-B01 |
New 28 GHz SC-ECRIS for RIKEN RI Beam Factory Project
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- T. Nakagawa
RIKEN Nishina Center, Wako, Saitama
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For RIKEN RI beam factory project, intense beam of U beam is strongly demanded. For this reason, we started to construct the new SC-ECRIS in 2007. Before construction, we intensively studied the effect of various parameters (magnetic field gas pressure etc) on the plasma. Based on these results, we designed new RIKEN SC-ECRIS for production of 15pmicroA of U35+. The Binj, Bext and Bmin are 4, 2.2 and 2.1 T, respectively. The plasma chamber size is 15cm in diameter and 55 cm in length, respectively. Main feature of this ECRIS is that we can control the magnetic field gradient at ECR zone, size of ECR zone, and mirror ratio with wide range using 6 sets of solenoid coils. The maximum ECR zone size will be 3~4 times as large as the conventional magnetic field configuration. We use the two JT+GM refrigerators to obtain enough cooling power (~10W at 4K) when using 28GHz microwaves. In June 2008, we make a first test experiment of the Sc-coils. In this contribution, we report the detailed design, results of the test experinet, and how to determine the magnetic field configuration and chamber size, etc, based on the basic studies of the ECR plasma.
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| MOCO-B02 |
Continuous and Pulsed Operation of a Highly Efficient 18 GHz Plateau-ECRIS
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- J. H. Andrä
Westfaelische Wilhelms-Universität Muenster, Muenster
- B. Albers, A. Heinen, L. Hupe, M. Kahnt, L. Nowack, H. W. Ortjohann, A. Taschner, Ch. Vitt, S. Wolosin
Institut fur Kernphysik, Westfalische Wilhelms-Universitat Munster, Munster
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A highly efficient 18 GHz Plateau-ECRIS (PECRIS V) has been developed. The magnetic field on axis has a flat plateau-minimum. Together with a very strong permanent magnetic hexapole it creates a large resonance volume. In this resonance volume electrons are electron-cyclotron-resonance-heated more efficiently than in standard ECRIS and the maximum density of the plasma is obtained near the axis from where ions are primarily extracted. The plasma chamber is designed as a microwave resonator with specific end-plates to achieve high microwave amplitudes on the axis in spite of the low microwave power of <500 W. Up to 4 microwave frequencies have simultaneously been used. By the use of several frequencies at, above , and below the plateau, we become less sensitive on density variations in the plasma. We also present a technique for the extraction of intense short pulses of highly charged ions. This technique temporarily reduces the magnetic field on the extraction side and is an interesting alternative to the afterglow, in particular for the highest charge states. The design and the highly efficient operation of PECRIS V may thus serve as guideline for the future conceptions of ECRIS.
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| MOCO-B03 |
Brightness Studies of the Ion Beams Produced by SUSI - The Source for Ions
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- P. A. Zavodszky, D. Cole, M. Doleans, G. Machicoane, F. Marti, X. Wu
NSCL, East Lansing, Michigan
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Funding: Work supported by NSF under grant PHY-0110253 and by MSU.
We designed and constructed a new, completely superconducting Electron Cyclotron Resonance Ion Source (ECRIS) called SuSI, operating at 18+14.5 GHz microwave frequencies. Besides the increased intensities, this ECRIS was designed with several adjustable parameters in order to allow the optimization of the extracted ion beam brightness: magnetic field (axial magnetic peak position and magnitude, radial magnetic field magnitude), plasma chamber length, bias disc position and voltage, extraction electrode (puller) position and voltage and bias voltage on the beamline. The accelerated beam intensity out of the Coupled Cyclotron Facility is determined not only by the available ion beam intensity from the ECRIS but also by emittance of the ion beam and its proper match to the cyclotron acceptance. The emittance of the extracted ions was measured with an Allison-type emittance scanner. We will present the general performance of SuSI as well as results from beam studies on the influence of the tunable ion source parameters on the intensity and emittance of the extracted ion beams. Emphasis will be on the results for the medium charge states needed for the CCF operation.
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| MOCO-B04 |
Ion Beam Research and Development Work at JYFL
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- H. A. Koivisto, T. Ropponen, M. Savonen, V. A. Toivanen
JYFL, Jyvaskyla
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During the last year the main focus of the JYFL ion source group has been on the studies of the beam transmission and time evolution of Bremsstrahlung and on the development of metal ion beams. Comprehensive studies of the beam transmission efficiency at the Department of Physics, University of Jyvaskyla have shown several problems concerning the injection line of the K-130 cyclotron. The experiments have shown strongly non-uniform and elliptical beam shape which limits the beam transmission efficiency. The Bremsstrahlung time evolution will be presented in other article in this same proceedings (T. Ropponen et. al). We will also shortly describe the development work carried out by the inductively heated oven.
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| MOCO-B05 |
The High Charge State All-Permanent Magnet ECRIS Operated on 320 kV HV Platform
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An all-permanent magnet ECR ion source named LAPECR2 (Lanzhou All-permanent magnet ECR ion source No. 2) has been built and tested at IMP. This ion source is designed and operated to produce intense ion beams of both low charge states (such as H+, He2+, Xe3+) and high charge states (such as Ar14+, Xe30+) for the 320 kV high voltage (HV) platform at IMP. Many good results have been obtained on LAPECR2, such as 1emA O6+, 130 eμA O7+, 166 eμA Ar11+, 0.33eμA Ar17+, 85 eμA Xe20+, 24eμA Xe27+, 2eμA Xe31+. This ion source was designed to fulfill the various requirements of all of the experimental terminals, such as the delivery of metallic ion beams. A high temperature micro-oven has been fabricated and installed on the source to produce stable metal vapor. This HV platform has been successfully biased to 395 kV without ion beam. And ion beams with the energy up to 150 keV/q have already been delivered to the successive experimental terminals. After a brief introduction of the source LAPECR2, the operation status on the HV platform is discussed. The typical performance of the source of both gaseous and some metallic ion beams will be given in this paper.
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