Radiation measurement in plasma disruption by thin-foil infrared bolometer

Abstract

A thin-foil infrared bolometer has been developed to measure the plasma radiation quantitatively during plasma disruptions in the KSTAR tokamak. We present analytic solutions of a 0D heat transfer model, which enable the estimation of the plasma radiation from the bolometer signal. The analytical solutions for the linear response regime give practical ways by which the radiation power and energy can be estimated from the cooling time scale of the bolometer signal. A useful way of evaluating the linear response of the system is also introduced. The analysis is complemented by 2D heat transfer simulations. The bolometer signals from the shattered pellet injection experiments in the 2020 KSTAR campaign are analyzed and interpreted according to the heat transfer models.

Dispersion relation and instability for an anisotropic nonuniform flowing plasma

“…fields can be enhanced by an instability, the instability analysis can be used to interpret the signals from plasmas. Diagnostics for fusion devices have been developed to examine plasma instability via electromagnetic waves [15][16][17]. The waves from space have been measured in order to investigate space or astrophysical plasmas [18][19][20][21].…”