6533b839fe1ef96bd12a5c7e

RESEARCH PRODUCT

Power efficiency improvements with the radio frequency H− ion source

Taneli KalvasMorgan DehnelJuha TuunanenDave PotkinsJ. KomppulaHannu KoivistoT. StewartOlli Tarvainen

subject

010302 applied physicsMaterials scienceta114ta213Electromagnetbusiness.industryRF power amplifierCyclotronPlasma01 natural sciencesIon sourcelaw.inventionion sourceslawMagnet0103 physical sciencesOptoelectronicsRadio frequencypower efficiency010306 general physicsbusinessInstrumentationElectrical efficiency

description

CW 13.56 MHz radio frequency-driven H(-) ion source is under development at the University of Jyväskylä for replacing an existing filament-driven ion source at the MCC30/15 cyclotron. Previously, production of 1 mA H(-) beam, which is the target intensity of the ion source, has been reported at 3 kW of RF power. The original ion source front plate with an adjustable electromagnet based filter field has been replaced with a new front plate with permanent magnet filter field. The new structure is more open and enables a higher flux of ro-vibrationally excited molecules towards the plasma electrode and provides a better control of the potential near the extraction due to a stronger separation of the main plasma from the plasma electrode. While the original system provided better control over the e(-)/H(-) ratio, the new configuration has led to a higher production efficiency of 1 mA H(-) at 1.75 kW RF power. The latest results and upgrade plans are presented.

yearjournalcountryeditionlanguage
2016-03-03Review of Scientific Instruments
https://doi.org/10.1063/1.4932008