Paper |
Title |
Page |
TPPE031 |
60 mA Carbon Beam Acceleration with DPIS
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2206 |
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- M. Okamura, R.A. Jameson, K. Sakakibara, J. Takano
RIKEN, Saitama
- T. Fujimoto, S. Shibuya, T. Takeuchi
AEC, Chiba
- Y. Iwata, K. Yamamoto
NIRS, Chiba-shi
- H. Kashiwagi
JAERI/ARTC, Gunma-ken
- A. Schempp
IAP, Frankfurt-am-Main
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We have studied "direct plasma injection scheme (DPIS)" since 2000. This new scheme is for producing very intense heavy ions using a combination of an RFQ and a laser ion source. An induced laser plasma goes directly into the RFQ without an extraction electrode nor any focusing devices. Obtained maximum peak current of Carbon 4+ beam reached 60 mA with this extremely simple configuration. The details of the experimental result will be presented.
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RPAP007 |
Alternating-Phase-Focused Linac with Interdigital H-Mode Structure for Medical Injectors
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1084 |
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- Y. Iwata, T. Fujisawa, T. Furukawa, S. H. Hojo, T. Honma, M. Kanazawa, N. M. Miyahara, T. Murakami, M. Muramatsu, K. Noda, H. Ogawa, M. Torikoshi, S. Yamada, K. Yamamoto
NIRS, Chiba-shi
- Y.F. Fujii, T. Mitsumoto, H. Tsutsui
SHI, Tokyo
- T. Fujimoto, H.O. Ogawa
AEC, Chiba
- V.V. Kapin
MEPhI, Moscow
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Tumor therapy using Heavy Ion Medical Accelerator in Chiba (HIMAC) has been performed at National Institute of Radiological Sciences (NIRS). With the successful clinical results over ten years, a project on developing compact accelerators has been started. To design these compact accelerators, a size of an injector as well as construction and operation costs plays an important role. To satisfy these requirements, we propose a compact injector consisting of a RFQ and Interdigital H-mode Drift-Tube-Linac (IH-DTL) having the resonant frequency of 200 MHz. The injector will accelerate carbon ion up to 4.0 AMeV. For the beam focusing of the IH-DTL, the method of Alternating-Phase-Focusing was employed. With the IH structure and rather high operating-frequency, the size of the cavities is compact; the radius is approximately 0.4 m, and the length of the RFQ and IH-DTL will be 2.5m and 3.5m respectively. The fabrication of the RFQ is in progress. For the IH-DTL, the full-scale model was fabricated. With the encouraging results of the electric field measurements, we are developing the final design of the IH-DTL. The fabrication of the entire injector will be completed at the end of 2005. The present status of our project will be shown.
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FPAE004 |
Optical Matching of Slowly Extracted Beam with Transport System at HIMAC
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910 |
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- T. Furukawa, K. Noda, E. Takada, M. Torikoshi, T.H. Uesugi, S. Yamada
NIRS, Chiba-shi
- T. Fujimoto, M. Katsumata, S. Shibuya, T. Shiraishi
AEC, Chiba
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The optical matching between the ring and the transport line plays important role in order to control the beam size and profile after the transport. At HIMAC, thus, we have studied the optical matching of the slowly extracted beam. As a result, it was verified that the beam size of the slowly extracted beam were controlled owing to the optical matching. It was also found that small deviation of quadrupole strength in the ring brings orbit distortion at the transport system.
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