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Title: Saddle antenna radio frequency ion sources

Existing RF ion sources for accelerators have specific efficiencies for H{sup +} and H{sup −} ion generation ∼3–5 mA/cm{sup 2} kW, where about 50 kW of RF power is typically needed for 50 mA beam current production. The Saddle Antenna (SA) surface plasma source (SPS) described here was developed to improve H{sup −} ion production efficiency, reliability, and availability. In SA RF ion source, the efficiency of positive ion generation in the plasma has been improved to 200 mA/cm{sup 2} kW. After cesiation, the current of negative ions to the collector was increased from 1 mA to 10 mA with RF power ∼1.5 kW in the plasma (6 mm diameter emission aperture) and up to 30 mA with ∼4 kW RF. Continuous wave (CW) operation of the SA SPS has been tested on the test stand. The general design of the CW SA SPS is based on the pulsed version. Some modifications were made to improve the cooling and cesiation stability. CW operation with negative ion extraction was tested with RF power up to ∼1.2 kW in the plasma with production up to Ic = 7 mA. A stable long time generation of H{sup −} beam without degradation was demonstratedmore » in RF discharge with AlN discharge chamber.« less
Authors:
;  [1] ; ; ; ; ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Muons, Inc., Batavia, Illinois 60510 (United States)
  2. ORNL, Oak Ridge, Tennessee 37831 (United States)
  3. TLU, Seguin, Texas 78155 (United States)
  4. UMD, College Park, Maryland 32611 (United States)
  5. (Russian Federation)
Publication Date:
OSTI Identifier:
22482928
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; ACCELERATORS; ANIONS; ANTENNAS; APERTURES; BEAM CURRENTS; BEAMS; DESIGN; EFFICIENCY; HYDROGEN IONS 1 PLUS; ION SOURCES; PLASMA; PULSES; RADIOWAVE RADIATION; RELIABILITY; STABILITY