THE PRECISION OF ELECTRON CYCLOTRON EMISSION MEASUREMENTS FROM THE DITE TOKAMAK.
Corrections for the systematic errors associated with the measurements of electron cyclotron emission are considered under the following headings: (a) Finite optical depth, (b) Finite density and refraction, (c) Relativistic resonance layer width, (d) Magnetic field corrections, (e) Frequency response, (f) Spatial resolution of the viewing optics, and (g) Frequency resolution. These corrections are applied to experimental emission spectra and the derived electron temperature profiles compared with laser scattering measurements in a discharge where the plasma equilibrium is changing. The Shafranov shift of the corresponding temperature surfaces is shown to be in good agreement with that expected for the magnetic flux surfaces. Using the wall reflection model, the electron density profile is derived from the emission profile of the third harmonic cyclotron frequency.
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON. OX14 3DB (UK), MENTIONING REPORT CLM-P 673, 1983
Record Number: 1989122017200 / Last updated on: 1987-01-01
Available languages: en