Author: Ma, H.Y.
Paper Title Page
MOPPH009
 Status of IMP Permanent Magnet Proton Source for CI-ADS Project  
 
  • Q. Wu, H.Y. Ma, L.T. Sun, Y. Yang, X.Z. Zhang, Z.M. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  To produce the requested 10 mA proton beam for the China Initiative Accelerator Driven Sub-critical reactor Linac (CI-ADS), electron cyclotron resonance (ECR) ion sources operating at 2.45 GHz have been developed. The CI-ADS proton source developed at IMP can produced stable 35 keV/10 mA continuous wave (cw) beam at the RFQ entrance. The proton beam extracted by a 3-electrode extraction system passes through a low energy beam transport system (LEBT), which is composed of identical solenoids, into the 3.2 MeV radio-frequency quadrupole (RFQ). In order to ensure superconducting cavities commissioning and protection, an electrostatic-chopper has been designed and installed in the LEBT line that can chop the cw beam into a pulsed one. The achieved fall/rise time of the chopper is less than 20 ns. In this paper, the performance of the proton source and the LEBT, such as beam reliability, emittance and beam current tuning will be presented.  
 
MOPPH010
 Development of a 14 GHz High Intensity Proton Source  
 
  • W.H. Zhang, Y.C. Feng, J.W. Guo, X.X. Li, H.Y. Ma, C. Qian, L.T. Sun, Q. Wu, H.J. Zhang, X.Z. Zhang, Z.M. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  A high intensity ECR proton source with 14 GHz microwave heating was successfully developed at IMP. The idea of the working mechanism and the structure of the proton source, as well as using 14 GHz microwave heating, were first proposed in the world. The experimental platform was set up and preliminary commissioning was performed. The experimental results indicate that the source can produce a total of 4 mA CW hydrogen beams with microwave power of 200 W and extraction voltage of 40 kV, in which H2+ and H3+ are included. The successful commissioning of the proton source demonstrates that the proposed mechanism and the structure are feasible.  
 
WEOMMH02 First Commissioning Results of An Evaporative Cooling Magnet ECRIS-LECR4 107
 
  • W. Lu, Y.C. Feng, S.Q. Guo, B.H. Ma, H.Y. Ma, L.T. Sun, X.Z. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  • L. Ruan, B. Xiong
    IEE, Beijing, People's Republic of China
  
  LECR4 (Lanzhou ECR ion source No.4) is a room temperature ECR ion source, designed to produce high current, multiple charge state ions for SSC-linac project at IMP. The ion source has been optimized to be operated at 18 GHz. A unique feature of LECR4 is that all its solenoid coils are fully immersed in a special medium and cooled by evaporative cooling technology when excited. At design current, the coils can produce peak mirror fields on axis 2.3 Tesla at injection, 1.3 Tesla at extraction and 0.5 Tesla at minimum-B. The nominal radial magnetic field is 1.1 Tesla at plasma chamber wall, which is produced by a Halbach structure 36-segment hexapole. Recently, the project has made significant progress. In January 2014, the first plasma at 18 GHz was ignited. During the ongoing commissioning phase with a stainless steel chamber, tests with gaseous ion beams have been conducted. Some intense ion beams have been produced with microwave power less than 1.5 kW, such as 1.97 emA of O6+, 1.7 emA of Ar8+, 1.07 emA of Ar9+, 290 euA of Xe20+ and so on. In this paper, the design of LECR4 ion source will be presented, and the latest test results will also be given.  
slides icon Slides WEOMMH02 [3.543 MB]