First Results of the Superconducting ECR Ion Source Venus with 28 GHz

Details First Results of the Superconducting ECR Ion Source Venus with 28 GHz First Results of the Superconducting ECR Ion Source Venus with 28 GHz

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..749....3l&link_type=abstract

ELECTRON CYCLOTRON RESONANCE ION SOURCES: 16th International Workshop on ECR Ion Sources ECRIS'04. AIP Conference Proceedings, V

Physics

1

Ion Sources: Positive And Negative, Positive-Ion Beams, Ionization Of Plasmas, Magnetic Confinement And Equilibrium, Plasma Heating By Microwaves, Ecr, Lh, Collisional Heating

Scientific paper

VENUS (Versatile ECR ion source for NUclear Science) is a next generation superconducting ECR ion source, designed to produce high current, high charge state ions for the 88-Inch Cyclotron at the Lawrence Berkeley National Laboratory. VENUS also serves as the prototype ion source for the RIA (Rare Isotope Accelerator) front end. The magnetic confinement configuration consists of three superconducting axial coils and six superconducting radial coils in a sextupole configuration. The nominal design fields of the axial magnets are 4T at injection and 3T at extraction; the nominal radial design field strength at the plasma chamber wall is 2T, making VENUS the world most powerful ECR plasma confinement structure. From the beginning, VENUS has been designed for optimum operation at 28 GHz with high power (10 kW).
In 2003 the VENUS ECR ion source was commissioned at 18 GHz, while preparations for 28 GHz operation were being conducted. During this commissioning phase with 18 GHz, tests with various gases and metals have been performed with up to 2000 W RF power. At the initial commissioning tests at 18 GHz, 1100 eμA of O6+, 160 eμA of Xe20+, 160 eμA of Bi25+ and 100 eμA of Bi30+ and 11 eμA of Bi41+ were produced.
In May 2004 the 28 GHz microwave power has been coupled into the VENUS ECR ion source. At initial operation more than 320 eμA of Xe20+ (twice the amount extracted at 18 GHz), 240 eμA of Bi24+ and Bi25+, and 245 eμA of Bi29+ were extracted. The paper briefly describes the design of the VENUS source, the 28 GHz microwave system and its beam analyzing system. First results at 28 GHz including emittance measurements are presented.

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