Abstract
The magnitude of the d(3He, p) α fusion emission is measured on the tokamak fusion test reactor (TFTR) by detection of the prompt losses of 14.7-MeV protons. This system consists of four detectors poloidally distributed along the bottom of TFTR. Each detector spatially resolves 14.7-MeV protons which are born above the detector and which grad B drift into the detector.