The loss of MeV alpha particles from JET plasmas has been measured with a set of thin foil Faraday cup detectors during third harmonic heating of helium neutral beam ions. Tail temperatures of ∼2 MeV have been observed, with radial scrape off lengths of a few centimeters. Operational experience from this system indicates that such detectors are potentially feasible for future large tokamaks, but careful attention to screening rf and MHD induced noise is essential. © 2010 EURATOM.
All Science Journal Classification (ASJC) codes
Darrow, D. S., Cecil, F. E., Kiptily, V., Fullard, K., Horton, A., & Murari, A. (2010). Observation of alpha particle loss from JET plasmas during ion cyclotron resonance frequency heating using a thin foil Faraday cup detector array. Review of Scientific Instruments, 81(10), -. [10D330]. https://doi.org/10.1063/1.3502325