ECRH and ECE on HSX stellarator
Abstract
Plasma heating on HSX stellarator is made by the extraordinary wave at the second harmonic of the electron cyclotron frequency. Absorption of launched power is measured with 6 microwave antennas. Three receiving antennas are mounted in vicinity of ECRH launcher and three others are distributed along the machine. The results of these measurements show a high multi-pass absorption (>0.8) in both quasi-symmetric and 10% mirror configurations. The measurements are supported by intensive ray tracing calculations in Maxwellian and bi-Maxwellian plasmas. The electron cyclotron emission spectrum is measured by 8-channel radiometer. At high plasma density (>1.7x10^18 m-3) the emission is thermal while at low plasma density the emission is mostly due to supra-thermal electron. The interpretation of ECE spectra is done with modified 3-D ray tracing code. Autocorrelation function technique is used to find out the level of electron temperature fluctuations in HSX plasma. Future upgrades on ECRH and ECE systems will be discussed. Work Supported by US DOE under grant DE-FG02-93ER54222
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DPPPP1041L