Different Methods for Measuring Plasma Displacement in Tokamaks, Construction Compensation of Continuous Coils in IR-T1 Tokamak

摘要

The measurement of current-carrying plasma column displacement is very important for plasma position control. Two methods for this purpose are introduced. In this paper, calculation and construction of these coils is explained. Multiple moment method has been used and derived for construction of sensing coils Also Fourier Transform has been used and derived for continuous coils. The comparison of their advantages are investigated. For IR-T1 Tokamak, Two Cosine coils & two Saddle Sine coils were designed and constructed, which have been placed diametrically around minor radius of torus. Then an electronic circuit was designed for adding and integrating the Cosine and Saddle Sine coils output with proper gain. The contribution of each coils in final output is calculated. For compensation of unwanted pickups voltage from the time varying fields each signal with adjustable gain is added to main signal, until removing the additional field effects. The final output holds good proportionality to H.D.