Author: Li, J.B.
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TUA5 High Power Operation with SECRAL-II Ion Source 58
  • L.T. Sun, X. Fang, J.W. Guo, W. Huang, J.B. Li, L. B. Li, L. X. Li, W. Lu, H.Y. Ma, Z. Shen, Y. Yang, W.H. Zhang, X.Z. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  SECRAL-II ion source has been successfully developed with the experiences from SECRAL that is another superconducting ECR ion source in operation at IMP. Other than that, SECRAL-II has been intentionally optimized in structure so as to make it optimum for 28 GHz microwave operation. This ion source was available on the test bench in early 2016, and has been used for 28 GHz high microwave power commissioning and tests. With a maximum power 10 kW@28 GHz and 2 kW@18 GHz, very high microwave power density and dense hot plasma could be built in the 5-liter volume plasma chamber. Consequently very high current density ion beams of high charge states are achievable, which have already exceeded the performance the 24 GHz SECRAL had made couple of years ago. However, there is also the intractable issues stemmed from the hot dense electrons inside the plasma, such as plasma chamber cooling, dynamic heat load to the cryogenic system, and so on. This paper will present the recent results of SECRAL-II operated with high microwave power. The typical consequent issues during the high power course other than high intensity high charge state ion beam production will be discussed.  
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Bremsstrahlung Measurements with SECRAL II Ion Source  
  • J.B. Li, J.W. Guo, L. B. Li, W. Lu, L.T. Sun, X.Z. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  To investigate the hot electrons in highly charged electron cyclotron resonance (ECR) plasma, the bremsstrahlung spectra for X-rays between 10 and 300 keV were measured from SECRAL- II, a third-generation ECRIS at the Institute of Modern Physics. We focused on how the external source parameters, especially the magnetic configuration affect the axial bremsstrahlung and the resulting spectral temperature Ts. The experimental results have shown that Ts appears to be dependent solely on the minimum magnetic field Bmin rather than (Bmin/BECR) and the microwave frequency '. In addition, this investigation has shown that Ts is not sensitive to HV, bias and gas pressure, which implies that a more careful consideration into the heating mechanism of ECRIS is needed.  
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