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Title: Reduction of beam current noise in the FNAL magnetron ion source

The new FNAL Injector Line with a circular dimple magnetron ion source has been operational since December of 2012. Since the new injector came on line there have been variations in the H- beam current flattop observed near the downstream end of the Linac. Several different cathode geometries including a hollow cathode suggested by Dudnikov [1] were tried. Previous studies also showed that different mixtures of hydrogen and nitrogen had an effect on beam current noise [2]. We expanded on those studies by trying mixtures ranging from (0.25% nitrogen, 99.75% hydrogen) to (3% nitrogen, 97% hydrogen). The results of these studies in our test stand will be presented in this paper.
Authors:
; ;  [1]
  1. Fermi National Accelerator Laboratory, Proton Source Department, P.O. Box 500, Batavia, Illinois (United States)
Publication Date:
OSTI Identifier:
22391461
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM CURRENTS; BEAM INJECTION; BEAM PRODUCTION; FERMILAB ACCELERATOR; HOLLOW CATHODES; HYDROGEN; HYDROGEN IONS 1 MINUS; ION BEAMS; ION SOURCES; LINEAR ACCELERATORS; MAGNETRONS; MIXTURES; NITROGEN; NOISE; VARIATIONS