Experimental comparison of compact RFPs, spheromaks and STs under controlled current drive

摘要

A comparative experiment on low aspect ratio (A≈1.5)torus plasmas, including compact reversed field pinches (RFPs), spheromaks and spherical tokamaks (STs), has been performed in the TS-3 and TS-4 compact toroid (CT) devices. In particular, a compact RFP with q_o as large as 0.3 was Found to have a low n dynamo mode, n = 3, while a spheromak with q_o ≈0.5 had an n= 2 mode. Under OH current sustainment, the magnetic fluctuation and loop voltage of the CT were observed To increase inversely with its q value.