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Chinese Physics C> 2007, Vol. 31> Issue(S1) : 232-235 

A 2.45 GHz High Current Ion Source for Neutron Production

  •  Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

  • A 2.45GHz microwave-driven ion source is being used to provide 40mA of deuterium ion beam (peak current) for an RFQ accelerator as part of a neutron source system. We have also designed a 60kV electrostatic LEBT using computer simulations. In our experiment, we measured the hydrogen and deuterium ion beam currents as functions of discharge power, gas flow, and magnetic field strength. The required beam current was obtained using less than 700W of net microwave power with a gas flow of less than 1.5sccm. From the rise time data, it was determined that in order to obtain a high percentage of atomic ions in the beam, the beam extraction should start after 1ms of switching on the microwave power. At steady state, the proton fraction was above 90%.
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    [1] . Ludewigt B A, Bleuel D L, Ho M D et al. Accelerator-Driven Neutron Source for Cargo Screening, 19th International Conference on the Application of Accelerators in Research and Industry, Fort. Worth, Texas, Aug 20-25,20062. Staples J W, Ho M D, Kwan J W et al. Design of an RFQ Based Neutron Source for Cargo Container Interrogation,Linear Accelerator Conf., Knoxville, TN, Aug 21-25, 20063. Taylor T, Mouris J F. Nucl. Instr. Meth. Phys. Research,1993, A336: 1-54. Sherman J D et al. Rev. Sci. Instrum., 2002, 73: 9175. Derenchuka V P. Rev. Sci. Instrum., 2004, 75: 18516. SONG Z, PENG S, YU J et al. Rev. Sci. Instrum, 2006,77: 03A3057. PBGUNS Version 5.04, copyright Aug. 2001 by Jack E.Boers Ph.D. and Thunderbird Simulations8. Tanaka M, Hara S, Hae T et al. Rev. Sci. Instrum., 2004,75: 1894

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J.W.Kwan, R.Gough, R.Keller, B.A.Ludewigt, M.Regis, R.P.Wells and J.H.Vainionpaa. A 2.45 GHz High Current Ion Source for Neutron Production[J]. Chinese Physics C, 2007, 31(S1): 232-235.
J.W.Kwan, R.Gough, R.Keller, B.A.Ludewigt, M.Regis, R.P.Wells and J.H.Vainionpaa. A 2.45 GHz High Current Ion Source for Neutron Production[J]. Chinese Physics C, 2007, 31(S1): 232-235. shu
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Received: 2007-05-30
Revised: 1900-01-01
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A 2.45 GHz High Current Ion Source for Neutron Production

    Corresponding author: J.W.Kwan,
  • Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
  • Received Date: 2007-05-30
  • Accepted Date: 1900-01-01
  • Available Online: 2007-01-03

Abstract: A 2.45GHz microwave-driven ion source is being used to provide 40mA of deuterium ion beam (peak current) for an RFQ accelerator as part of a neutron source system. We have also designed a 60kV electrostatic LEBT using computer simulations. In our experiment, we measured the hydrogen and deuterium ion beam currents as functions of discharge power, gas flow, and magnetic field strength. The required beam current was obtained using less than 700W of net microwave power with a gas flow of less than 1.5sccm. From the rise time data, it was determined that in order to obtain a high percentage of atomic ions in the beam, the beam extraction should start after 1ms of switching on the microwave power. At steady state, the proton fraction was above 90%.

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