The simulation of hard x-ray images obtained during lower hybrid current drive on PBX-M
- and others
During lower hybrid current drive on PBX-M suprathermal electrons in the 30 to 150 keV range are generated. These electrons emit hard X-ray bremsstrahlung in collisions with plasma ions; the radiation creates images in a hard X-ray pinhole camera. In order to interpret the hard X-ray images, a computer simulation code has been written, the PBXRAY code. It represents an extension of the STEVENS code that calculates the free-free and free-bound radiation for non-Maxwellian relativistic electron tail distributions. The PBXRAY code provides the chord integration in the bean-shaped plasma geometry on PBX-M and integrates over photon energy. The simulations show that the location of the suprathermal electrons can be determined with an accuracy of approximately two centimeters in the plasma. In particular, the authors analyzed discharges whose characteristic ``hollow`` images indicate off-axis LH current drive. A comparison of images taken with different absorber foils reveals that the suprathermal electrons have less than 150 keV parallel energy for the hollow discharges.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 10190839
- Report Number(s):
- PPPL-3016; ON: DE95001930; TRN: 94:021304
- Resource Relation:
- Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
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Determination of the energy of suprathermal electrons during lower hybrid current drive on PBX-M
Determination of the energy of suprathermal electrons during lower hybrid current drive on PBX-M
Related Subjects
PBX DEVICES
ELECTRON DENSITY
ELECTRON TEMPERATURE
PLASMA DIAGNOSTICS
CAMERAS
HARD X RADIATION
ELECTRON-ION COLLISIONS
P CODES
DATA ANALYSIS
TAIL ELECTRONS
IMAGE INTENSIFIERS
COMPUTERIZED SIMULATION
LOWER HYBRID CURRENT DRIVE
SENSITIVITY
700320
PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION