TITLE

Experiments with biased cylinder in electron cyclotron resonance ion source (plenary)

AUTHOR(S)
Drentje, A. G.; Kitagawa, A.; Muramatsu, M.; Ogawa, H.; Sakamoto, Y.
PUB. DATE
May 2004
SOURCE
Review of Scientific Instruments;May2004, Vol. 75 Issue 5, p1399
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The shape of the magnetic field of an electron cyclotron resonance ion source (ECRIS) gives rise to different particle fluxes (losses) from the plasma to the end plates (mainly diffusion of electrons), and to the side walls (mainly ions). The electron fluxes to the injection end plate can be reduced by negatively biasing this plate (or so-called biased disk); this appeared to be successful to improve the output of highly charged ions (HCIs). In the present experiment it was demonstrated that by positively biasing the side walls, the HCI production can be improved as well. Electrons leaking from the ECRIS plasma to the side wall find their way easiest at the “pole” areas (of the hexapole magnet) because these are the areas where fieldlines pass the plasma chamber. A special construction was made to study the effect of biasing two different regions: (1) the areas between the six poles, and (2) the parts corresponding to the poles. Measurements show that method (2) gives better performance of the source. The relative improvement for the highest observed charge states is the best, and in absolute sense the application of the method is giving, e.g., a four times higher intensity for Ar11+ beams. © 2004 American Institute of Physics.
ACCESSION #
13154614

 

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