Reduction of beam current noise in the FNAL magnetron ion source

Journal Article · Wed Apr 08 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4916482· OSTI ID:22391461

Bollinger, D. S., E-mail: [e-mail]; Karns, P. R., E-mail: [e-mail]; Tan, C. Y., E-mail: [e-mail] ^[1]

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1. Fermi National Accelerator Laboratory, Proton Source Department, P.O. Box 500, Batavia, Illinois (United States)

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.

• OSTI ID: 22391461
• Journal Information: AIP Conference Proceedings, Vol. 1655, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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