Production of High Energy Tail Electrons by Electron Bernstein Waves during the Current Start-up Discharges in the LATE Device

Journal Article · Fri Dec 23 00:00:00 EST 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3665019· OSTI ID:21612523

Tanaka, H; Uchida, M; Watanabe, F; Noguchi, Y; Maekawa, T ^[1]

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1. Graduate School of Energy Science, Kyoto University, Kyoto (Japan)

Toroidal plasma current is started and ramped up by injecting microwave power in the electron cyclotron range of frequency without induction in the LATE device. Radial scanning with hard X-ray pulse height analysis reveals the production of high energy electrons with average energy {approx}100 keV in the radial region from R = 28 cm to 40.5 cm, which are heated by electron Bernstein wave. The radial profile of photon counts in the energy range from 25 to 200 keV is very similar to that of perpendicular pressure obtained by magnetic measurement and equilibrium analysis, suggesting that a significant portion of trapped electrons exists outside the last closed flux surface. The plasma current inside the LCFS is carried mainly by passing electrons, while some portion of the outside current may be generated as a result of the toroidal precession of trapped electrons.

• OSTI ID: 21612523
• Journal Information: AIP Conference Proceedings, Vol. 1406, Issue 1; Conference: 9. topical conference on radio frequency power in plasmas, Newport (United States), 1-3 Jun 2011; Other Information: DOI: 10.1063/1.3665019; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BERNSTEIN MODE
CURRENT-DRIVE HEATING
ECR HEATING
ELECTRIC CURRENTS
HARD X RADIATION
KEV RANGE
MAGNETIC SURFACES
MICROWAVE RADIATION
PHOTONS
PLASMA WAVES
SOLENOIDS
START-UP
TAIL ELECTRONS
TOKAMAK DEVICES
TRAPPED ELECTRONS
BOSONS
CLOSED PLASMA DEVICES
CURRENTS
ELECTRIC COILS
ELECTRIC HEATING
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EQUIPMENT
FERMIONS
HEATING
HIGH-FREQUENCY HEATING
IONIZING RADIATIONS
JOULE HEATING
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
MASSLESS PARTICLES
OSCILLATION MODES
PLASMA HEATING
RADIATIONS
THERMONUCLEAR DEVICES
X RADIATION