Particle transport in the edge plasma of the IR-T1 tokamak in the presence of a resonant helical field (RHF) and biased limiter have been investigated and analyzed. For this purpose, a limiter biasing system was designed and constructed. The time evolution of the potential fluctuation, the electric field and the turbulent transport have been measured using two arrays of Langmuir probes in both the radial and poloidal directions. The experiments have been carried out in different regimes: as positive and negative limiter biasing, RHF and a combination of the two. The analyses have been done by the fast Fourier transport method. The results show that radial turbulent transport decreases by about 60% after applying positive biasing while it increases by about 40% after negative biasing. The effect of positive biasing on the poloidal turbulent transport displays an increase of about 55%, while negative biasing decreases the poloidal turbulent transport by about 30%. Consequently, confinement is improved and plasma density rises significantly due to applying positive biasing in IR-T1. But the results are inversed when negative biasing is applied. Also, in this work, the results of an applied RHF (with mode L = 3) are compared with biasing results and discussed.
کلید واژگان :tokamak, RHF, turbulent transport
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک