[ital Z][sub eff] profiles measured by visible and soft x-ray bremsstrahlung arrays in TFTR (abstract)
- Princeton University, Princeton, New Jersey 08543 (United States)
The [ital Z][sub eff] profiles from the tangential array of visible bremsstrahlung (VB) emission (5235 A) have shown several interesting features in TFTR. The observed [ital Z][sub eff] profile was flat during the ohmic phase and hollow during the neutral-beam heating phase. In order to crosscheck the measured [ital Z][sub eff] profiles from the VB array, a poloidal array which measures bremsstrahlung emission in the soft x-ray region has been analyzed. The analysis of array measurements in the two different spectral regions was performed on the same geometry determined from the Abel inversion of the electron density (interferometry). The two independent measurements of [ital Z][sub eff] profiles have been consistent with each other for most of the discharges in TFTR. However, in a discharge where the two measurements are inconsistent, the [ital Z][sub eff] profile deduced from the VB array indicates some degree of problems. In this paper, the detailed analysis of the bremsstrahlung array (both poloidal and tangential) measurements is presented. Particularly, the effects of geometry in the inversion process, such as a poloidal elongation of flux surfaces, are investigated.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6700250
- Journal Information:
- Review of Scientific Instruments; (United States), Vol. 66:1; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLASMA DIAGNOSTICS
EFFECTIVE CHARGE
TFTR TOKAMAK
BREMSSTRAHLUNG
CONFIGURATION
SOFT X RADIATION
VISIBLE RADIATION
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
X RADIATION
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)