Diagnosis of MeV range fast ions by collective Thomson scattering (CTS) of
millimetre waves was successfully demonstrated at JET. Building on the expe
riences from JET, a new millimetre wave based CTS fast ion diagnostic is be
ing built for the TEXTOR tokamak. With this we intend to address both gener
ic issues of energetic ion dynamics and specific issues for ion cyclotron r
esonance heating. (C) 2001 Elsevier Science B.V. All rights reserved.