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Title: Power efficiency improvements with the radio frequency H{sup −} ion source

CW 13.56 MHz radio frequency-driven H{sup −} ion source is under development at the University of Jyväskylä for replacing an existing filament-driven ion source at the MCC30/15 cyclotron. Previously, production of 1 mA H{sup −} beam, which is the target intensity of the ion source, has been reported at 3 kW of RF power. The original ion source front plate with an adjustable electromagnet based filter field has been replaced with a new front plate with permanent magnet filter field. The new structure is more open and enables a higher flux of ro-vibrationally excited molecules towards the plasma electrode and provides a better control of the potential near the extraction due to a stronger separation of the main plasma from the plasma electrode. While the original system provided better control over the e{sup −}/H{sup −} ratio, the new configuration has led to a higher production efficiency of 1 mA H{sup −} at 1.75 kW RF power. The latest results and upgrade plans are presented.
Authors:
; ; ; ;  [1] ; ; ;  [2]
  1. Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FI-40014 Jyväskylä (Finland)
  2. D-Pace, Inc., P.O. Box 201, Nelson, British Columbia V1L 5P9 (Canada)
Publication Date:
OSTI Identifier:
22482924
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; EFFICIENCY; ELECTRODES; ELECTROMAGNETS; FILTERS; HYDROGEN 1 MINUS BEAMS; ION SOURCES; MHZ RANGE 01-100; PERMANENT MAGNETS; PLASMA; RADIOWAVE RADIATION