Optically thin perpendicular electron-cyclotron emission from hot electrons in TMX-U

Journal Article · Fri Aug 01 04:00:00 EDT 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1139204· OSTI ID:5642282

James, R A; Lasnier, C J; Ellis, R F

Perpendicular electron-cyclotron emission (PECE) from relativistic (T-italic/sub H-italic/--100--400 keV) hot electrons within the thermal-barrier region of Tandem Mirror Experiment-Upgrade (TMX-U) is detected at 35, 60, 94, and 98 GHz. For the operating regime of TMX-U, these signals are optically thin (tau<<1) and thus proportional to the radial hot-electron line density. A relativistic code is used to calculate the theoretical temperature dependence of the perpendicular emission coefficient, j-italic/sub perpendicular/(..omega.., T-italic/sub H-italic/), for each of the detected frequencies. This dependence has been verified experimentally by x-ray measurements of the hot electron temperature, T-italic/sub H-italic/. The observed qualitative agreement demonstrates that optically thin PECE signals can be used to determine the temporal evolution of T-italic/sub H-italic/. An inability to absolutely calibrate the present PECE waveguide system has prevented quantitative agreement.

• Research Organization: Lawrence Livermore National Laboratory, University of California, P. O. Box 5508, Livermore, California 94550
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5642282
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 57:8; ISSN RSINA
• Country of Publication: United States
• Language: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
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