J.P. Qian et al 2009 Nucl. Fusion 49 025003 doi:10.1088/0029-5515/49/2/025003
J.P. Qian1, L.L. Lao2, Q.L. Ren1, H. Rinderknecht3, F. Volpe4, C. Zhang1 and B.N. Wan1
Show affiliationsThe method of using internal magnetic surface information from soft x-ray (SXR) measurements to facilitate equilibrium reconstruction is explored. It is shown that useful information about the shape of the safety-factor q profile in DIII-D can be generally determined from the information inferred from surfaces of constant SXR emissivity. Comparisons of magnetic surfaces and the q profile reconstructed using external magnetic and SXR data against those using magnetic and motional Stark effect (MSE) data are presented. The reconstructed results using SXR and external magnetic data are found to reasonably agree with those derived from MSE and external magnetic data. The choice of an appropriate number of fitting parameters to reconstruct the q profile is also investigated.
52.55.Fa Tokamaks, spherical tokamaks
52.70.La X-ray and gamma-ray measurements
Issue 2 (February 2009)
Received 13 August 2008, accepted for publication 8 December 2008
Published 30 December 2008
J.P. Qian et al 2009 Nucl. Fusion 49 025003
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