A comparison between soft x-ray and magnetic phase data on the Madison symmetric torus.
Rev Sci Instrum
; 87(11): 11E322, 2016 Nov.
Article
em En
| MEDLINE
| ID: mdl-27910686
ABSTRACT
The Soft X-Ray (SXR) tomography system on the Madison Symmetric Torus uses four cameras to determine the emissivity structure of the plasma. This structure should directly correspond to the structure of the magnetic field; however, there is an apparent phase difference between the emissivity reconstructions and magnetic field reconstructions when using a cylindrical approximation. The difference between the phase of the dominant rotating helical mode of the magnetic field and the motion of the brightest line of sight for each SXR camera is dependent on both the camera viewing angle and the plasma conditions. Holding these parameters fixed, this phase difference is shown to be consistent over multiple measurements when only toroidal or poloidal magnetic field components are considered. These differences emerge from physical effects of the toroidal geometry which are not captured in the cylindrical approximation.
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MEDLINE
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En
Ano de publicação:
2016
Tipo de documento:
Article