NONLINEAR ABSORPTION OF HIGH-POWER FREE-ELECTRON-LASER-GENERATED MICROWAVES AT ELECTRON-CYCLOTRON-RESONANCE HEATING FREQUENCIES IN THE MTX TOKAMAK

Authors
ALLEN SL BROWN MD BYERS JA CASPER TA COHEN BI COHEN RH FENSTERMACHER ME FOOTE JH HOOPER EB LASNIER CJ LOPEZ P MAKOWSKI MA MARINAK MM MEYER WH MOLLER JM NEVINS WM RICE BW ROGNLIEN TD SMITH GR STALLARD BW SCHARLEMANN ET THOMASSEN KI WOOD RD HOSHINO K OASA K ODA T ODAJIMA K OGAWA T OHGO T
Citation
Sl. Allen et al., NONLINEAR ABSORPTION OF HIGH-POWER FREE-ELECTRON-LASER-GENERATED MICROWAVES AT ELECTRON-CYCLOTRON-RESONANCE HEATING FREQUENCIES IN THE MTX TOKAMAK, Physical review letters, 72(9), 1994, pp. 1348-1351
Citations number
19
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
9
Year of publication
1994
Pages
1348 - 1351
Database
ISI
SICI code
0031-9007(1994)72:9<1348:NAOHFM>2.0.ZU;2-1
Abstract
We report the first measurements of single-pass propagation of intense (>1-GW, 20-ns) microwaves through a high-density [n(e)=(0.5-2.4) x 10 (20) m-3] tokamak plasma at 140 GHz, the fundamental electron cyclotro n resonance frequency. Compared with low-power pulses, these free elec tron laser generated intense pulses were not as strongly absorbed by t he plasma, in agreement with predictions of nonlinear theory. Enhanced absorption of intense pulses was achieved by increasing the gradient in the parallel index of refraction (N(parallel-to) of the microwave b eam.