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Title: Improvement of the Kei2 source for a new carbon therapy facility

Abstract

A compact electron cyclotron resonance ion source with all permanent magnets has been developed for a new carbon therapy facility at NIRS. Initial tests with the Kei2 source have given a maximum intensity of 530 e {mu}A for C{sup 4+} at an extraction voltage of 40 kV and beam stability of better than 6% for 90 h at 280 e {mu}A at 30 kV. In these beam tests, there was continuously unwanted discharge around the puller at high-voltage extraction (above 40 kV). The start of discharge is caused by the short distance of 5 mm between the end of the plasma chamber and puller. At high-voltage extraction, this discharge will give rise to unwanted vapor from the copper puller. Then, the vacuum pressure in the extraction region will become worse. In order to suppress the discharge, the plasma chamber and puller were modified. Finally, a beam intensity of 380 e {mu}A was obtained with good stability at an extraction voltage of 30 kV. This article describes the modification of the puller for stable beam extraction, measurements of beam emittance, and improvement of C{sup 4+} intensity.

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2];  [2];  [2];  [3]
  1. Graduate School of Mechanical Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-0815 (Japan) and National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan)
  2. (Japan)
  3. (Netherlands)
Publication Date:
OSTI Identifier:
20778947
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 3; Conference: 11. international conference on ion sources, Caen (France), 12-16 Sep 2005; Other Information: DOI: 10.1063/1.2151902; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM EMITTANCE; BEAM EXTRACTION; CARBON; CARBON IONS; ECR ION SOURCES; PARTICLE BEAMS; PERMANENT MAGNETS; STABILITY; THERAPY

Citation Formats

Muramatsu, M., Kitagawa, A., Ogawa, Hirotsugu, Iwata, Y., Yamamoto, K., Yamada, S., Ogawa, Hiroyuki, Fujimoto, T., Yoshida, Y., Drentje, A., National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Accelerator Engineering Corporation, Ltd., 2-13-1 Konakadai, Inage, Chiba 263-0043, Department of Mechanical Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-0815, and K.V.I., University of Groningen, 9747 AA Groningen. Improvement of the Kei2 source for a new carbon therapy facility. United States: N. p., 2006. Web. doi:10.1063/1.2151902.
Muramatsu, M., Kitagawa, A., Ogawa, Hirotsugu, Iwata, Y., Yamamoto, K., Yamada, S., Ogawa, Hiroyuki, Fujimoto, T., Yoshida, Y., Drentje, A., National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Accelerator Engineering Corporation, Ltd., 2-13-1 Konakadai, Inage, Chiba 263-0043, Department of Mechanical Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-0815, & K.V.I., University of Groningen, 9747 AA Groningen. Improvement of the Kei2 source for a new carbon therapy facility. United States. doi:10.1063/1.2151902.
Muramatsu, M., Kitagawa, A., Ogawa, Hirotsugu, Iwata, Y., Yamamoto, K., Yamada, S., Ogawa, Hiroyuki, Fujimoto, T., Yoshida, Y., Drentje, A., National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Accelerator Engineering Corporation, Ltd., 2-13-1 Konakadai, Inage, Chiba 263-0043, Department of Mechanical Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-0815, and K.V.I., University of Groningen, 9747 AA Groningen. Wed . "Improvement of the Kei2 source for a new carbon therapy facility". United States. doi:10.1063/1.2151902.
@article{osti_20778947,
title = {Improvement of the Kei2 source for a new carbon therapy facility},
author = {Muramatsu, M. and Kitagawa, A. and Ogawa, Hirotsugu and Iwata, Y. and Yamamoto, K. and Yamada, S. and Ogawa, Hiroyuki and Fujimoto, T. and Yoshida, Y. and Drentje, A. and National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555 and Accelerator Engineering Corporation, Ltd., 2-13-1 Konakadai, Inage, Chiba 263-0043 and Department of Mechanical Engineering, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-0815 and K.V.I., University of Groningen, 9747 AA Groningen},
abstractNote = {A compact electron cyclotron resonance ion source with all permanent magnets has been developed for a new carbon therapy facility at NIRS. Initial tests with the Kei2 source have given a maximum intensity of 530 e {mu}A for C{sup 4+} at an extraction voltage of 40 kV and beam stability of better than 6% for 90 h at 280 e {mu}A at 30 kV. In these beam tests, there was continuously unwanted discharge around the puller at high-voltage extraction (above 40 kV). The start of discharge is caused by the short distance of 5 mm between the end of the plasma chamber and puller. At high-voltage extraction, this discharge will give rise to unwanted vapor from the copper puller. Then, the vacuum pressure in the extraction region will become worse. In order to suppress the discharge, the plasma chamber and puller were modified. Finally, a beam intensity of 380 e {mu}A was obtained with good stability at an extraction voltage of 30 kV. This article describes the modification of the puller for stable beam extraction, measurements of beam emittance, and improvement of C{sup 4+} intensity.},
doi = {10.1063/1.2151902},
journal = {Review of Scientific Instruments},
number = 3,
volume = 77,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}