Observation of alpha particle loss from JET plasmas during ion cyclotron resonance frequency heating using a thin foil Faraday cup detector array

D S Darrow; F E Cecil; V Kiptily; K Fullard; A Horton; A Murari; JET EFDA Contributors

doi:10.1063/1.3502325

Observation of alpha particle loss from JET plasmas during ion cyclotron resonance frequency heating using a thin foil Faraday cup detector array

Rev Sci Instrum. 2010 Oct;81(10):10D330. doi: 10.1063/1.3502325.

Authors

D S Darrow¹, F E Cecil, V Kiptily, K Fullard, A Horton, A Murari; JET EFDA Contributors

Affiliation

¹ Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA. ddarrow@pppl.gov

PMID: 21058457
DOI: 10.1063/1.3502325

Abstract

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.