Beat wave current drive experiment on DDT
Several improvements have been made to the beat wave experiment this year. We are now able to vary the magnetic field over a much larger range, the plasma density is more uniform, and the electron temperature is significantly higher than last year (making it easier to couple energy from the electrostatic wave into the electron distribution). We have found evidence that at higher magnetic fields, {omega}{sub ce}/{omega}{sub pe} > 1, that numerous electrostatic modes are excited. This may be due to the fact that for a bounded plasma, {omega} < {omega}{sub pe} is allowed (for small wave numbers). Although we are still not sure why the {rvec k} matching criteria (rvec k{sub 0} = {rvec k}{sub 1} + {rvec k}{sub e}) is not more restrictive. A 35 GHz microwave scattering diagnostic has been designed, built, and tested in order to make a less perturbing measure of the electrostatic wave.
- Research Organization:
- California Univ., Davis, CA (United States). Dept. of Applied Science
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-89ER53289
- OSTI ID:
- 5300359
- Report Number(s):
- DOE/ER/53289-T1; ON: DE91017407
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLASMA DIAGNOSTICS
TOKAMAK DEVICES
NON-INDUCTIVE CURRENT DRIVE
DISPERSION RELATIONS
ELECTRON TEMPERATURE
MAGNETIC FIELDS
MICROWAVE RADIATION
PLASMA DENSITY
PROGRESS REPORT
CLOSED PLASMA DEVICES
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
RADIATIONS
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production
700102 - Fusion Energy- Plasma Research- Diagnostics