1993 annual report for the Phaedrus-T RF current drive experiments
After a series of antenna modifications and a program of optimizing our Boronization procedures, we have succeeded in coupling 300 kill of rf power to the plasma. Thomson Scattering shows a 20--60% increase in core T{sub e}, and constitutes experimental evidence that the waves are interacting with the electron population. Beam Emission Spectroscopy (BES) data show that the power is deposited in the core and at the edge as predicted by theoretical modeling. Ninety degree phasing of the antenna caused loop voltage drops of 15--25%, which can be interpreted as an increase 5 kA of toroidal plasma current for co-injection phasing versus counter injection phasing. Biased H-modes have been created with a biased electrode. These plasmas have a steeper edge density gradient and reduced edge fluctuations than our normal limiter plasmas and a D{sub alpha} emission drop at the limiter. Radial profiles of soft x-ray line emission have been measured by the Johns Hopkins group and significantly aided in our understanding of impurity generation with rf and in the biased H-mode. Initial reflectometry data shows the presence of rf density fluctuations in the plasma. Different boronization techniques have been tried leading to a higher boron content in the deposited layer and reduced wall recycling. In this report, we outline the series of experiments that we have performed in the last year that led us to our present encouraging results.
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-88ER53264
- OSTI ID:
- 10188919
- Report Number(s):
- DOE/ER/53264-4; ON: DE94001369; BR: AT0520100/AT0520210; TRN: 93:025519
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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