The beam commissioning of a CW high charge state heavy ion RFQ

摘要

The SSC-LINAC project is launched at Institute of Modern Physics in China to develop one new linear accelerator (LINAC) injector for separated sector cyclotron (SSC). It includes a high charge state ion source, a CW RFQ and a DTL section, and is designed to accelerate ions up to 580 keV/u. Now the ion source and the RFQ cavity have been installed in the main hall and the beam commissioning has been carried out. Two kinds of ions have been tested, ~(16)O~(5+) and ~(40)Ar~(8+). The experiment result of ~(16)O~(5+) is: the measured beam current is 180 μA at entrance of RFQ and 150 μA at exit of RFQ The output energy of ~(16)O~(5+) is 141.89 keV/u. The measured beam current is 210 μA at entrance of RFQ and 198 μA at exit of RFQ for ~(40)Ar~(8+). The output energy of ~(40)Ar~(8+) is 142.78 keV/u. The experiment results agree with the design parameters of RFQ very well. This paper presents: the design consideration of beam dynamics, RF and cooling structure design; measurement of the cold model; high power test of RFQ and beam commissioning result.