PERFORMANCE OF THE NEUTRON DIAGNOSTIC SYSTEM FOR ALCATOR C-MOD

Measurement of the global neutron production from the Alcator C-Mod tokamak has been done for all experimental operation in deuterium, which commenced in August 1993. Up to 3×1012 neutrons/s have been measured for diverse plasmas, including high current (1 MA), pellet injected, and rf heated discharges. Measurements during the initial run period were obtained using two sets of neutron detectors housed in polyethylene loaded moderator stations. Two more moderator stations containing additional neutron detectors have been obtained from LLNL and have been installed in the Alcator C-Mod experimental cell. The system has been calibrated using Cf252 placed at discrete points inside the Alcator C-Mod vacuum vessel. This paper presents a description of the diagnostic, followed by details of the calibration method and results. A discussion of the derivation of ion temperature from the global measurements is included with first results from the integrated system. © 1995 American Institute of Physics.