Negative ion radio frequency surface plasma source with solenoidal magnetic field

Abstract

Pulsed and CW operation of negative ion radio frequency surface plasma source with a solenoidal magnetic field is described.Dependences of a beam current on RF power, extraction voltage, solenoid magnetic field, gas flow are presented. Compact design of RF SPS is presented. CW OPERATIONContinuous wave (CW) operation of the SA SPS has been tested in the small SNS test stand. The general design of the CW SA SPS is based on the pulsed version considered above [3,4]. Some modifications were made to improve cooling and cesiation stability. For CW operation was prepared simplified version of RF SPS with solenoidal magnetic field shown in Fig. 18. In CW mode of operation a discharge can be triggered at high gas pressure and after discharge triggering gas pressure can be decreased. In this case we don't need the triggering plasma gun.