Mode conversion to ion-Bernstein waves of fast Alfv{acute e}n waves with poloidal wavenumbers in sheared magnetic fields
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Previous theoretical analysis [1] of mode conversion of fast Alfv{acute e}n waves (FAW) to ion-Bernstein waves (IBW) neglected poloidal variations of the fields and magnetic shear. Full-wave codes show incident FAW fields focused into multiple poloidal modes near the ion-ion hybrid resonance (IHR) [2]. A new mode conversion model has been constructed including poloidal wavenumbers and poloidal magnetic field. The model consists of two coupled equations for the perpendicular components of the FAW electric field. These equations are numerically integrated to find the fraction of FAW power resonantly absorbed at the IHR. When the high-field-side right-hand cutoff is included, nonzero poloidal wavenumbers can change the triplet resonator phase and improve mode conversion at low k{sub {parallel}}. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Massachusetts Institute of Technology
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-78ET51013; FG02-91ER54109
- OSTI ID:
- 664621
- Report Number(s):
- CONF-9704102--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 403; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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