A High-Temperature, "Volume-Type" ECR Ion Source for RIB Generation
- ORNL
A high temperature, low-charge-state, "volume-type" source has been designed for use in the nuclear physics and nuclear astrophysics research radioactive ion beam (RIB) programs at the Holifield Radioactive Ion beam Facility (HRIBF). The source utilizes electromagnetic coils to generate a large and uniformly distributed central magnetic field with magnitude (875 G) chosen to be in electron-cyclotron-resonance (ECR) with single- frequency (2.45 GHz) microwave radiation. Among the features of the source includti a variable mirror-ratio at ion extraction as required for optimizing low-charge state ion beam generation, a right-hand, circularly-polarized RF injection system to overcome the relatively-low, cutoff-density, (nC - 7.4x10'0/cm3) associated with the use of 2.45 GHz microwave radiatiom, and a high temperature, Ir- or Re-coated-Ta plasma chamber to reduce the residence times of radioactive species that are adsorbed on the walls of the chamber. No provisions are made for radial plasma confinement due to the sensitivity of permanent magnets to degradation by the huge fluxes of neutrons incumbent during target irradiation, routinely used for this purpose. Aspects of the design features of the source are described in this report.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); Oak Ridge, TN
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 6254
- Report Number(s):
- ORNL/CP-102709; KB 04 01 02 1; ON: DE00006254
- Country of Publication:
- United States
- Language:
- English
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