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

Abstract

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.

Authors:
; ; ; ;  [1]; ; ;  [2]
  1. University of Jyväskylä, Department of Physics (Finland)
  2. D-Pace, Inc., Nelson, B.C. Canada (Canada)
Publication Date:
OSTI Identifier:
22391423
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
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); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kalvas, T., Tarvainen, O., Komppula, J., Koivisto, H., Tuunanen, J., Potkins, D., Stewart, T., and Dehnel, M. P. A CW radiofrequency ion source for production of negative hydrogen ion beams for cyclotrons. United States: N. p., 2015. Web. doi:10.1063/1.4916442.
Kalvas, T., Tarvainen, O., Komppula, J., Koivisto, H., Tuunanen, J., Potkins, D., Stewart, T., & Dehnel, M. P. A CW radiofrequency ion source for production of negative hydrogen ion beams for cyclotrons. United States. doi:10.1063/1.4916442.
Kalvas, T., Tarvainen, O., Komppula, J., Koivisto, H., Tuunanen, J., Potkins, D., Stewart, T., and Dehnel, M. P. Wed . "A CW radiofrequency ion source for production of negative hydrogen ion beams for cyclotrons". United States. doi:10.1063/1.4916442.
@article{osti_22391423,
title = {A CW radiofrequency ion source for production of negative hydrogen ion beams for cyclotrons},
author = {Kalvas, T. and Tarvainen, O. and Komppula, J. and Koivisto, H. and Tuunanen, J. and Potkins, D. and Stewart, T. and Dehnel, M. P.},
abstractNote = {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.},
doi = {10.1063/1.4916442},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1655,
place = {United States},
year = {2015},
month = {4}
}