Use of multiple-discrete-frequency microwave radiation to enhance the performances of traditional B-minimum electron cyclotron resonance ion sources

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1148727· OSTI ID:591876

Alton, G D; Meyer, F W; Liu, Y; Beene, J R ^[1]; Tucker, D ^[2]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee (United States)
2. Lambda Technologies, Inc., Raleigh, North Carolina (United States)

The performances of electron cyclotron resonance (ECR) ion sources, in terms of high-charge-state yields and intensities within a particular charge-state, can be enhanced by increasing the physical sizes of the ECR zones in relation to the sizes of their plasma volumes. The ECR plasma {open_quotes}volumes{close_quotes} of traditional B-minimum ECR sources can be increased by injecting broadband microwave radiation (multiple-discrete frequency, variable frequency, or broad-bandwidth frequency microwave radiation) derived from standard klystron, gyrotron, or traveling-wave-tube (TWT) technologies (frequency domain). In this work, comparisons were made of the charge-state distributions of Ar{sup q+} and Xe{sup q+} extracted from the ORNL Caprice ECR ion source, when excited with single frequency and multiple-discrete-frequency microwave radiation, derived from standard klystron and/or TWT technologies. The charge-state populations for Ar{sup q+} and Xe{sup q+} move toward higher values when excited with modest power from two and three discrete frequency, microwave radiation compared to those generated with power from single-frequency radiation. For three-frequency plasma excitation, the most probable charge state for Xe is increased by one charge-state unit while the beam intensities for charge-states higher than the most probable are increased by factors of {approximately}3 over those for the single frequency plasma case. The results of these measurements along with details on the modifications to the injection system required to couple the microwave radiation into the plasma volume of the Caprice source will be presented in this article. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 591876
• Report Number(s): CONF-980145--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 2 Vol. 69; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ARGON
BEAM EXTRACTION
BEAM INJECTION HEATING
CATIONS
CHARGE STATES
CYCLOTRONS
ECR ION SOURCES
HEAVY ION ACCELERATORS
HIGH-FREQUENCY HEATING
ION SOURCES
LINEAR ACCELERATORS
LINEAR COLLIDERS
MICROWAVE RADIATION
PERFORMANCE
PLASMA HEATING
PLASMA PRODUCTION
RF SYSTEMS
XENON