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First results from the new RIKEN superconducting electron cyclotron resonance ion source (invited)

Source: Rev. Sci. Instrum. 81, 02A320 (2010); doi:10.1063/1.3259232

Published 16 February 2010

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T. Nakagawa,1 Y. Higurashi,1 J. Ohnishi,1 T. Aihara,2 M. Tamura,2 A. Uchiyama,2 H. Okuno,1 K. Kusaka,1 M. Kidera,1 E. Ikezawa,1 M. Fujimaki,1 Y. Sato,1 Y. Watanabe,1 M. Komiyama,1 M. Kase,1 A. Goto,1 O. Kamigaito,1 and Y. Yano1
1Nishina Center for Accelerator Based Science, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
2SHI Accelerator Service Ltd., Ohsaki 1-17-6, Shinagawa Tokyo 141-0032, Japan
The next generation heavy ion accelerator facility, such as the RIKEN radio isotope (RI) beam factory, requires an intense beam of high charged heavy ions. In the past decade, performance of the electron cyclotron resonance (ECR) ion sources has been dramatically improved with increasing the magnetic field and rf frequency to enhance the density and confinement time of plasma. Furthermore, the effects of the key parameters (magnetic field configuration, gas pressure, etc.) on the ECR plasma have been revealed. Such basic studies give us how to optimize the ion source structure. Based on these studies and modern superconducting (SC) technology, we successfully constructed the new 28 GHz SC-ECRIS, which has a flexible magnetic field configuration to enlarge the ECR zone and to optimize the field gradient at ECR point. Using it, we investigated the effect of ECR zone size, magnetic field configuration, and biased disk on the beam intensity of the highly charged heavy ions with 18 GHz microwaves. In this article, we present the structure of the ion source and first experimental results with 18 GHz microwave in detail. ©2010 American Institute of Physics
History: Presented 21 September 2009; received 19 September 2009; accepted 11 October 2009; published 16 February 2010
Permalink: http://link.aip.org/link/?RSINAK/81/02A320/1

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