Plasma Electron Density Measurements in TRT Refractometry

Schemes of the application of refractometry for measuring the average plasma density at TRT (Tokamak with Reactor Technologies) facility, which is currently being designed, are considered and analyzed. Various schemes for the implementation of refractometry at TRT are proposed, taking into account the currently known plasma parameters in various scenarios of the facility operation, and their operation under TRT conditions is analyzed. The effect of different effects on the accuracy of determining the integral plasma density using refractometry in TRT is studied. On the basis of the analysis performed, the number of frequency channels used in refractometry is optimized, a variant of placement of refractometry diagnostic elements on the facility is proposed, the parameters of the diagnostic system are estimated: the accuracy of determining the integral plasma density, time resolution, minimum and maximum measurable plasma densities, and the possibility of using the diagnostics system online is studied.