The location is yet to be determined. Reflectometer measurements in previous 68 kA ERS plasmas have shown that the modes are localized to the region of weak shear near q-min. In addition, these modes transiently appear in the low NB power prelude phase after Li pellet injection. A tritium gas puff experiment was piggybacked onto a toroidal field scan of ERS plasmas to investigate the B-dependence of the transport. In previous experiments, the tritium transport within the reverse shear region of ERS plasmas was consistent with neoclassical predictions.
Neoclassical transport scales as the square of the magnetic field.
The measured neutron signals indicated long core confinement times similar to what has been previously seen in ERS plasmas. Transport analysis will follow. An experiment to study the empirically observed inverse dependence of the beta limit on toroidal field was performed on Thursday, March 27. The primary goal was to measure the fast ion pressure profile, an important component of the pressure for stability calculations. The neutrons produced from the Tritium beams dominate the neutron production.