Loss of alpha-like MeV fusion products from TFTR

A detailed comparison between the observed and expected loss of alpha-like MeV fusion products in TFTR is presented.The D-D fusion products (mainly the 1 MeV triton) were measured with an 2-D imaging scintillation detector.The expected first-orbit loss was calculated with a simple Lorentz orbit code.In almost all cases the measured loss was consistent with the expected first-orbit loss model.Exceptions are noted for small major radius plasmas and during strong MHD activity.