Plasma X-ray emission in the 20-500 keV range during lower hybrid current drive on Alcator

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · AIP Conf. Proc.; (United States)

DOI:https://doi.org/10.1063/1.35260· OSTI ID:5871386

Texter, S; Knowlton, S; McDermott, S; Porkolab, M; Takase, Y

An array of eight 1'' x 3'' NaI scintillators has been used to collect plasma hard x-ray spectra (E/sub ..gamma../>20 keV) emitted perpendicular to the magnetic axis during lower hybrid current drive on Alcator. The spectra exhibit a tail extending out to at least 300 keV and the profiles are generally peaked. These results show that the slope of the x-ray spectra increases with increasing plasma radius. Equivalently, the emission profiles tend to broaden with increasing photon energy. Also, the x-ray spectra slope increases at each radial location as the relative phasing of adjacent waveguides in the grill antenna is decreased. Preliminary results also suggest that the x-ray spectra tend to flatten and that the emission profiles tend to peak up with decreasing plasma density or increasing magnetic field. In addition, the initial results of an array for measuring the high energy x-ray emission from Alcator as a function of the emission angle relative to the magnetic axis are presented.

• Research Organization: Plasma Fusion Center, M.I.T., Cambridge, Massachusetts 02139
• OSTI ID: 5871386
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 129:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
ALCATOR DEVICE
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
DATA
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY RANGE
EXPERIMENTAL DATA
HARD X RADIATION
HEATING
HIGH-FREQUENCY HEATING
INFORMATION
IONIZING RADIATIONS
JOULE HEATING
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
LOWER HYBRID HEATING
MEASURING METHODS
NUMERICAL DATA
PLASMA
PLASMA HEATING
RADIATIONS
RESISTANCE HEATING
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS
X RADIATION
X-RAY SPECTRA