Experimental test of the resonant particle theory of asymmetry-induced transport
- Occidental College, Physics Department, Los Angeles, California 90041 (United States)
While it is easy to experimentally demonstrate that applied field asymmetries produce radial transport, convincing comparisons of experiment and theory have yet to be made. A key prediction of the theory is that the transport will be dominated by particles that move in resonance with the asymmetry. For the general case of a time-varying asymmetry, the resonance condition is {omega}-l{omega}{sub R}-kv=0, where v is the axial velocity, {omega}{sub R} is the ExB rotation frequency, and {omega}, l and k are the asymmetry frequency, azimuthal and axial wavenumbers, respectively. We present experiments on our low density trap in which {omega}, {omega}{sub R}, and k are varied and the resulting radial particle flux is measured. The experiments show a resonance in the flux similar to that predicted by theory. The peak frequency of this resonance increases with {omega}{sub R} and k, but not in the way theory predicts. The peak magnitude of the measured transport is roughly forty times smaller than the theoretical prediction, and low-frequency asymmetries are especially ineffective at producing transport.
- OSTI ID:
- 21210358
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 498; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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