Open AccessA CW radiofrequency ion source for production of negative hydrogen ion beams for cyclotrons
Author(s) -
T. Kalvas,
O. Tarvainen,
J. Komppula,
H. Koivisto,
J. Tuunanen,
David Potkins,
Theodor J. Stewart,
Morgan Dehnel
Publication year - 2015
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.4916442
Subject(s) - ion source , thermal emittance , materials science , cyclotron , atomic physics , ion beam , magnet , ion , beam (structure) , electron cyclotron resonance , electrode , ion beam deposition , ion gun , optoelectronics , optics , physics , plasma , nuclear physics , quantum mechanics
A CW 13.56 MHz radiofrequency-driven ion source RADIS for production of H− and D− 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− (2.6 mA/cm2), which is the intensity needed at injection for production of 200 µA H+ 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.
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