The direct injection of intense ion beams from a high field electron cyclotron resonance ion source into a radio frequency quadrupole

• DOI: 10.1063/1.4861405
• Publication Date: 2014-01-30T01:31:29Z
• Authors: G. Rodrigues; R. Becker; R. W. Hamm; R. Baskaran; D. Kanjilal; A. Roy
• Keywords: Radio-frequency quadrupole; Electron cyclotron resonance; Ion gun

The ion current achievable from high intensity ECR sources for highly charged ions is limited by the space charge. This makes classical extraction systems transport and subsequent matching to a radio frequency quadrupole (RFQ) accelerator less efficient. direct plasma injection (DPI) method developed originally laser source avoids these problems uses combined focusing of gap between RFQ vanes (or rods) rf fields penetrating into this gap. For performance that use superconducting solenoids, stray magnetic field in addition DPI scheme provides against charge blow-up beam. A extraction/matching system has been designed injecting an RFQ, allowing total beam 10 mA production 238U40+ (1.33 mA) be injected at voltage 60 kV. In design, features IGUN have used take account rf-focusing channel (without modulation), electrostatic vanes, solenoid, defocusing shown critical case matched