Ion energy balance in ohmically heated PLT discharges

Radial profiles of the ion temperature have been measured on the Princeton Large Torus (PLT) by using neutron flux Doppler broadening of oxygen, carbon, and helium line radiations, and charge exchange. The ion temperature (smaller than approximately 1.2 keV) is consistent with Hinton-Rosenbluth neoclassical heat conduction in the plateau regime as the dominant energy loss from the plasma with central ion energy confinement times smaller than approximately 0.1 s.