Equilibrium-based iterative tomography technique for soft X-ray in stellarators

Author

Navarro, A.P. ; Ochando, M.A. ; Weller, A.

Volume

19

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

569

Lastpage

579

Abstract

A method to deduce local values of plasma emissivity from chord measurements has been developed and tested using data from a 30 detector soft X-ray array in the Wendelstein 7A stellarator. This technique, based on the calculated distribution of toroidal magnetic flux as the initial guess for the plasma emissivity, uses an iterative scheme to algebraically determine the distribution of the detector signals, and solves some drawbacks of the currently available tomography techniques. This method is especially suited for stellarator devices in which plasma cross sections are markedly noncircular and change as a function of the toroidal angle

Keywords

X-ray detection and measurement; plasma diagnostic techniques; stellarators; 30 detector soft X-ray array; VIIA; Wendelstein 7A stellarator; chord measurements; detector signals; distribution; equilibrium-based iterative tomography; local values; noncircular cross-section; plasma cross sections; plasma emissivity; toroidal angle; toroidal magnetic flux; Magnetic flux; Plasma devices; Plasma measurements; Plasma x-ray sources; Sensor arrays; Signal detection; Testing; Tomography; X-ray detection; X-ray detectors;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.90321

Filename

90321