Ion beam injection system for a variable energy RFQ accelerator
Abstract
A new injection system designed for a variable energy RFQ (radio frequency quadrupole) accelerator was developed from the viewpoint of introducing a high current ion beam into the RFQ. This injection system consists of a high current multiply charged ion source, a sector-type mass-separator, and a magnetic quadrupole triplet. The ion source is designed for effective production of a milliampere class lower-charge-state multiply charged ion beam. The mass-separator has a double-focusing action in order to mass-separate the high current beam. The quadrupole lens functions to focus the beam at the RFQ inlet position. In the experiments an Ar + injection beam current of 2.2 mA and an Ar 2+ current of 1.7 mA are obtained. The injection beam size is 10 mm Ø. A combination of this injection system with a variable energy RFQ accelerator should provide a milliampere class MeV ion implanter.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- April 1991
- DOI:
- 10.1016/0168-583X(91)96190-V
- Bibcode:
- 1991NIMPB..55..339A