Analysis of the deviations from the similarity between JET and ITER ion cyclotron resonance heating

Abstract

To predict the performances of ion-cyclotron resonance heating in ITER based on the existing JET experimental results, it is important to know the impact of the deviations from the exact similarity relations between these two tokamaks. For this aim, in this paper we identify three global scaling parameters depending on the main plasma/wave quantities, such as confining magnetic fields, major radius, plasma density and temperature, wave frequency, toroidal mode number, and absorbed wave power to describe the important difference between JET and ITER. By introducing three new scaling parameters to capture the Doppler effect, the plasma beta, and the fast ion kinetic effect, ITER will be expected to have a lower optimized minority concentration, a higher fraction of electron damping, a lower ion effective temperature. When the deviation from the exact scaling relations is not significant, the new scaling parameters represent sufficiently the linear change of the predicted results of ITER from the reference results of JET. Some inter-dependent nonlinear effects between the new scaling parameters are also examined.