Comparative electron temperature measurements of Thomson scattering and electron cyclotron emission diagnostics in TCABR plasmas

Abstract

A fast multichannel Martin-Puplett interferometer for electron cyclotron emission measurements on JET Rev. Sci. Instrum. 82, 113506 (2011) Absolute intensity calibration of flat-field space-resolved extreme ultraviolet spectrometer using radial profiles of visible and extreme ultraviolet bremsstrahlung continuum emitted from high-density plasmas in Large Helical Device Rev. Sci. Instrum. 82, 113102 (2011) Analysis of indium zinc oxide thin films by laser-induced breakdown spectroscopy J. Appl. Phys. 110, 083116 (2011) A line-imaging velocity interferometer technique for shock diagnostics without x-ray preheat limitation Rev. Sci. Instrum. 82, 103108 (2011) Production of neutrons up to 18 MeV in high-intensity, short-pulse laser matter interactions Phys. Plasmas 18, 100703 (2011) Additional information on Rev. Sci. Instrum. We present the first simultaneous measurements of the Thomson scattering and electron cyclotron emission radiometer diagnostics performed at TCABR tokamak with Alfvén wave heating. The Thomson scattering diagnostic is an upgraded version of the one previously installed at the ISTTOK tokamak, while the electron cyclotron emission radiometer employs a heterodyne sweeping radiometer. For purely Ohmic discharges, the electron temperature measurements from both diagnostics are in good agreement. Additional Alfvén wave heating does not affect the capability of the Thomson scattering diagnostic to measure the instantaneous electron temperature, whereas measurements from the electron cyclotron emission radiometer become underestimates of the actual temperature values.

Plasma Core Electron Density and Temperature Measurements Using CVI Line Emissions in TCABR Tokamak

“…The electron temperatures obtained in the combination of the set of three tokamak discharges are around 480 eV. This result is in good agreement with the T e values predicted in [12] and [13], and also for the plasma region where the higher probability of CVI emissions in the TCABR tokamak occurs. The electron density that was obtained oscillates between 1 and 4×10 13 cm −3 and is in good agreement with the values measured using microwave interferometry.…”

“…region where occurs the largest probability of CVI emissions [11] and also with measurements made using other diagnostic tools [12,13].…”