Eur. Phys. J. D (2015) 69: 130
https://doi.org/10.1140/epjd/e2015-50726-3

Regular Article

Electron cyclotron emission diagnostics on HT-7 tokamak

¹ Institute of Space Technology, P.O. Box 2750, 44000 Islamabad, Pakistan
² Institute of Plasma Physics, Chinese Academy of Sciences, P. O. Box 1126, Hefei, Anhui 230031, P.R. China

^a e-mail: msajjadus@yahoo.com

Received: 2 October 2014
Received in final form: 3 March 2015
Published online: 15 May 2015

Abstract

An electron cyclotron emission (ECE) diagnostic system measures the electron cyclotron emission from optically thick plasma that is limited to the blackbody radiation limit of the plasma at the cyclotron resonance location. This provides an electron temperature profile for plasmas with spatially varying magnetic fields, such as a tokamak. The second harmonic x-mode electron cyclotron emission (ECE) at frequency range 98–126 GHz is normally used in HT-7 tokamak to measure electron temperature, which is the only ECE detectable mode with optical depth >1. The theoretical review of ECE emission and its radiometry is briefly summarized.