ION TEMPERATURE PROFILE DECONVOLUTION AND CORRECTIONS TO CONFINEMENT PARAMETERS IN SPHEROMAKS

The purpose of this work is to determine ion temperature profiles in s pheromaks [Nucl. Fusion 19, 489 (1979)] for the first time. Knowledge of the ion temperature profile is necessary in the correct calculation of plasma confinement parameters. The work herein details the calcula tion of ion temperature profiles for the Compact Torus Experiment (CTX ) [Nucl. Fusion 28, 1555 (1988)] and S-1 [Phys. Rev. Lett. 46, 188 (19 81)] spheromaks. Data from single chord Doppler ion temperature measur ements in these devices have been analyzed with the aid of a one-dimen sional equilibrium charge state transport code. Using electron tempera ture and density profiles from Thomson scattering, and estimates for t ransport rates, a most probable position for the emission of line radi ation can be determined and correlated with the measured Doppler ion t emperature, thus generating an ion temperature profile. From this ion temperature profile determination, plasma confinement parameters for t he small solid flux conserver CTX [Phys. Fluids B 2, 1342 (1990)] sphe romak can be determined, and confinement parameters for S-1 can be ree valuated, eliminating the previous confinement calculations assumption T(i)(r) = T(e)(r). The CTX device has a calculated volume averaged be ta [beta] ranging from 3% to 8% and a volume averaged energy confineme nt time [tau(E)] between 14 and 35 musec; while the S-1 spheromak has [beta] between 15% and 40% and [tau(E)] ranging from 30 to 70 musec.