A CW radiofrequency ion source for production of negative hydrogen ion beams for cyclotrons

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

DOI:https://doi.org/10.1063/1.4916442· OSTI ID:22391423

Kalvas, T.; Tarvainen, O.; Komppula, J.; Koivisto, H.; Tuunanen, J. ^[1]; Potkins, D.; Stewart, T.; Dehnel, M. P. ^[2]

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1. University of Jyväskylä, Department of Physics (Finland)
2. D-Pace, Inc., Nelson, B.C. Canada (Canada)

A CW 13.56 MHz radiofrequency-driven ion source RADIS for production of H{sup −} and D{sup −} beams is under development for replacing the filament-driven ion source of the MCC30/15 cyclotron. The RF ion source has a 16-pole multicusp plasma chamber, an electromagnet-based magnetic filter and an external planar spiral RF antenna behind an AlN window. The extraction is a 5-electrode system with an adjustable puller electrode voltage for optimizing the beam formation, a water-cooled electron dump electrode and an accelerating einzel lens. At 2650 W of RF power, the source produces 1 mA of H{sup −} (2.6 mA/cm{sup 2}), which is the intensity needed at injection for production of 200 µA H{sup +} with the filament-driven ion source. A simple pepperpot device has been developed for characterizing the beam emittance. Plans for improving the power efficiency with the use of a new permanent magnet front plate is discussed.

• OSTI ID: 22391423
• 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

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
43 PARTICLE ACCELERATORS
ALUMINIUM NITRIDES
ANTENNAS
CYCLOTRONS
ELECTRIC POTENTIAL
ELECTRODES
ELECTROMAGNETS
ELECTRONS
FILAMENTS
HYDROGEN IONS 1 MINUS
HYDROGEN IONS 1 PLUS
ION BEAMS
ION SOURCES
MAGNETIC FILTERS
MHZ RANGE
OPTIMIZATION
PERMANENT MAGNETS
PLASMA
RADIOWAVE RADIATION
RF SYSTEMS