Experiments on Beam Extraction from the CAPRICE ECRIS

Classical compact ECRIS of small volume operating at 14 to 18 GHz provide an ion current density of several mA/cm2 at the extraction aperture (e.g. CAPRICE at 14.5 GHz). This is considerably less than typical values for high current ion sources which are in the order of up to several 100 mA/cm2 prot...

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Bibliographic Details
Published in:AIP conference proceedings 2005-01, Vol.749 (1), p.241-241
Main Authors: Tinschert, K, Spadtke, P, Bossler, J, Iannucci, R, Lang, R
Format: Article
Language:English
Subjects:
APERTURES
BEAM CURRENTS
BEAM EXTRACTION
COMPUTERIZED SIMULATION
CURRENT DENSITY
CYCLOTRON RESONANCE
ECR ION SOURCES
ELECTRIC FIELDS
GHZ RANGE
ION BEAMS
NUCLEAR PHYSICS AND RADIATION PHYSICS
PLASMA DENSITY
PROTONS
SPACE CHARGE
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Summary:Classical compact ECRIS of small volume operating at 14 to 18 GHz provide an ion current density of several mA/cm2 at the extraction aperture (e.g. CAPRICE at 14.5 GHz). This is considerably less than typical values for high current ion sources which are in the order of up to several 100 mA/cm2 proton equivalent for ion beams of lowly charged ions.However, the present development of powerful ECRIS with large volumes and higher plasma densities working at 28 GHz (or even higher frequencies) will lead to higher current densities which may approach the values of high current sources. Therefore a careful beam formation within the extraction which provides space charge compensation downstream behind the extraction system will be essential. The GSI CAPRICE ECRIS was equipped with a movable accel-decel extraction system in order to investigate the influence of electric field gradient and space charge compensation as well as further effects of ion extraction. First results will be presented and will be compared with computer simulations.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1893411