Author: Zhao, H.W.
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WE1AA01
 ECR Ion Sources for High-Intensity Heavy Ion Beams  
 
  • H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
  • D. Leitner
    LBNL, Berkeley, California, USA
  • T. Nakagawa
    RIKEN Nishina Center, Wako, Japan
  
  Heavy ion linac requires ion source to deliver high-intensity and highly-charged heavy ion beams in order to achieve higher beam intensity and better cost-effective performance. The 3rd generation highly-charged ECR ion sources with microwave frequency 24-28 GHz and NbTi superconducting magnet have been operating in a few laboratories worldwide, which are able to provide heavy ion beams such as 129Xe30+ of 300 euA, 238U33+ of 400 euA. To further improve beam intensity for higher charge state heavy ion beams, a 4th generation ECR ion source named as FECR (the First fourth generation ECR ion source) with frequency 45 GHz and Nb3Sn superconducting magnet is being developed at IMP. The FECR Nb3Sn magnet is being assembled and it is expected the first beam commissioning results could be presented. Recent research and development on the 3rd and 4th generation ECR ion sources for heavy ions will be reviewed, and future directions will be discussed in this talk.  
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FR1AA01
 Beam Commissioning and Operation Status of LEAF  
 
  • Y. Yang, L.T. Sun, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
  
  LEAF (Low Energy heavy ion Accelerator Facility) is a low energy high intensity heavy ion accelerator complex for multidiscipline researches that features a high performance superconducting ECR (Electron Cyclotron Resonance) ion source, and a high current heavy ion beam lianc. The facility has been put into commissioning since 2018. The RFQ has successfully accelerated the beams with M/q within 2~7 in the CW regime. High transmission efficiencies (typically higher than 97%) were relatively easy to achieve for beam currents of ~0.1 emA level. Experimental research such as C-C burning investigation in nuclear astrophysics needs intense heavy ion beam of a broad beam energy variation while maintaining very low energy spread. A setup of ion beam energy modulation system has been developed, which is mainly composed of a drift tube linac (DTL) for beam energy tuning and two quarter wave resonator (QWR) re-bunchers placed at upstream and downstream of the DTL respectively for beam quality control and longitudinal matching. More than 0.05 pmA carbon beam with an energy spread of <0.3% (FWHM) has been delivered to the experimental terminal.  
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