Author: Guo, J.W.
Paper Title Page
MOEO01
 Microwave Power Injection Schemes Study at IMP with Superconducting ECR Ion Source SECRAL  
 
  • J.W. Guo
    IMP/CAS, Lanzhou, People's Republic of China
  
  The performance of electron cyclotron resonance ion sources (ECRIS) is critically dependent on the resonant absorption efficiency of microwave power. Over-sized round waveguide with a diameter about Ø33.0 mm excited in the TE01 mode has been typically adopted for microwave coupling to the ECR plasma with the superconducting ECRIS operated at 24 or 28 GHz, such as SECRAL and VENUS. However, it should be realized that this is not necessarily the optimal scheme for microwave power injection. In order to study the impact of different microwave power distribution on ECRH efficiency and especially the production of highly charged ions, a set of compact and efficient mode convertors and mode transitions with different diameters applicable to 24 GHz SECRAL has been designed, fabricated and tested. SECRAL has been tested with the different microwave power injection schemes for the production intense highly charged heavy ion beams of Ar and Xe. A general comparison of the performance working at the different injection schemes with SECRAL will be given, and a preliminary analysis will be made in this paper.  
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TUAO04 SECRAL II Ion Source Development and the First Commissioning at 28 GHz 43
 
  • L.T. Sun, X. Fang, Y.C. Feng, J.W. Guo, H.Y. Ma, L.Z. Ma, Y.M. Ma, Z. Shen, W. Wu, T. Yang, Y. Yang, W.H. Zhang, X.Z. Zhang, B. Zhao, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  SECRAL II ion source has been successfully designed and developed at IMP. This ion source is a 3rd generation ECR machine optimized for the operation at 28 GHz. As a second superconducting ECR ion source developed at IMP with the identical coldmass design as SECRAL ion source, which has the sextupole coils external to the axial solenoids, the magnet performance is more robust according the training test. After a short time beam test at 18 GHz, SECRAL II has been commissioned at 28 GHz, and some preliminary results have been achieved with high charge state ion beam production. This paper will present the magnet design and test results. The first beam at 28 GHz will also be given.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-TUAO04  
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