Neutron spectrometry of JET discharges with ICRH-acceleration of helium beam ions

Recent experiments at JET aimed at producing (4)He ions in the MeV range through third harmonic ion cyclotron resonance heating (ICRH) acceleration of (4)He beams in a (4)He dominated plasma. MeV range D was also present through parasitic ICRH absorption on residual D. In this contribution, we analyze TOFOR neutron spectrometer data from these experiments. A consistent description of the data is obtained with d(d, n)(3) He and (9)Be(alpha, n)(12)C neutron components calculated using Stix distributions for the fast D and (4)He, taking finite Larmor radius effects into account and with a ICRH power partition of P(D)(RF) = 0.01 X P(4He)(RF), in agreement with TOMCAT simulations. (C) 2010 American Institute of Physics. [doi:10.1063/1.3502316]