Initial Results from the TFTR Poloidal Rotation Diagnostic
- Princeton Plasma Physics Laboratory, Princeton, NJ 08543 (United States)
\011A new spectroscopic diagnostic to measure poloidal velocity across the minor radius has recently been installed on TFTR. Data from a single channel already show marked changes in the measured poloidal velocity when the plasma conditions are actively modified, such as puffing helium to spoil supershot confinement or changing the co/counter mix of neutral beam injection. Preliminary measurements show apparent (i.e., line-integraded) carbon poloidal velocities up to 39 plus or minus 0.4 km/sec in reversed shear plasmas prior to the transition to enhanced confinement.\011This diagnostic complements the meaasurements of carbon, ion temperature, v(subscript phi), and n(subscript i) from existing charge exchange spectroscopy sytstem and B(subscript theta) from MSE measurements allowing the measurement of radial electric field profiles using the force balance equation. A novel inversion technigue (Ref. 1) has been developed to calculate local poloidal rotation velocities from line-integrated measurements. Two opposing vertical views are used to eliminate lineshifts due to effects of the charge exchange cross section. The time resolution is 20 msec and the inversion will yield a radial resolution of {tilde}3.5 cm.\011This diagnostic has been operational during the last six weeks of TFTR operation and a number of plasma conditions have been documented. The complete diagnostic calibration and software development are in progress. Data will be presented reflecting the state of the analysis at the time of the meeting.\011(Ref. 1 = R.E. Bell, Rev. Sci. Instrum, Vol. 68 (1997) pg. 1273)
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-CHO-3073
- OSTI ID:
- 16323
- Report Number(s):
- Cfp-3719; CONF-*-; ON: DE98050532
- Country of Publication:
- United States
- Language:
- English
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