Simulation of electron behavior in PIG ion sourcefor 9 MeV cyclotron

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M. Ghergherehchi, Y. H. Yeon, J. W. Kim and J. S. Chai. Simulation of electron behavior in PIG ion sourcefor 9 MeV cyclotron[J]. Chinese Physics C, 2014, 38(12): 127004. doi: 10.1088/1674-1137/38/12/127004
M. Ghergherehchi, Y. H. Yeon, J. W. Kim and J. S. Chai. Simulation of electron behavior in PIG ion sourcefor 9 MeV cyclotron[J]. Chinese Physics C, 2014, 38(12): 127004.  doi: 10.1088/1674-1137/38/12/127004 shu
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Received: 2013-12-27
Revised: 2013-12-27
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Simulation of electron behavior in PIG ion sourcefor 9 MeV cyclotron

    Corresponding author: J. S. Chai,

Abstract: In this paper, we focus on a PIG source for producing intense H-ions inside a 9 MeV cyclotron. The properties of the PIG ion source were simulated for a variety of electric field distributions and magnetic field strengths using a CST particle studio. After analyzing the secondary electron emission (SEE) as a function of both magnetic and electric field strengths, we found that for the modeled PIG geometry, a magnetic field strength of 0.2 T provided the best results in terms of the number of secondary electrons. Furthermore, at 0.2 T, the number of secondary electrons proved to be greatest regardless of the cathode potential. Also, the modified PIG ion source with quartz insulation tubes was tested in a KIRAMS-13 cyclotron by varying the gas flow rate and arc current, respectively. The capacity of the designed ion source was also demonstrated by producing plasma inside the constructed 9 MeV cyclotron. As a result, the ion source is verified as being capable of producing an intense H- beam and high ion beam current for the desired 9 MeV cyclotron. The simulation results provide experimental constraints for optimizing the strength of the plasma and final ion beam current at a target inside a cyclotron.

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