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Title: Improvements to the internal and external antenna H{sup −} ion sources at the Spallation Neutron Source

The Spallation Neutron Source (SNS), a large scale neutron production facility, routinely operates with 30–40 mA peak current in the linac. Recent measurements have shown that our RF-driven internal antenna, Cs-enhanced, multi-cusp ion sources injects ∼55 mA of H{sup −} beam current (∼1 ms, 60 Hz) at 65-kV into a Radio Frequency Quadrupole (RFQ) accelerator through a closely coupled electrostatic Low-Energy Beam Transport system. Over the last several years a decrease in RFQ transmission and issues with internal antennas has stimulated source development at the SNS both for the internal and external antenna ion sources. This report discusses progress in improving internal antenna reliability, H{sup −} yield improvements which resulted from modifications to the outlet aperture assembly (applicable to both internal and external antenna sources) and studies made of the long standing problem of beam persistence with the external antenna source. The current status of the external antenna ion source will also be presented.
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37830-6471 (United States)
  2. Muons, Inc., 552 N. Batavia Avenue, Batavia, Illinois 60510 (United States)
  3. Villanova University, 800E. Lancaster Ave, Villanova, Pennsylvania 19085 (United States)
Publication Date:
OSTI Identifier:
22253561
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ANTENNAS; APERTURES; BEAM CURRENTS; BEAM TRANSPORT; BEAMS; CUSPED GEOMETRIES; ION SOURCES; NEUTRON SOURCES; QUADRUPOLE LINACS; RADIOWAVE RADIATION; SPALLATION; TIN SULFIDES