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The heavy ion beam probe (HIBP) is a unique technique in fusion experiments for direct measurements of plasma electric potential. By orbit calculations the port geometry of the injection and diagnostic ports has been determined for the W7-X stellerator project. An optimization with respect to best access, minimum necessary beam energy and maximum detectable plasma region has been performed. As a result three different locations for HIBP were found. Because of other diagnostics and heating systems already fixed on ports, the most favourable scenario for HIBP is given by an injection at 15 and detection at 22 in the toroidal direction. The energy necessary to detect the plasma centre corresponds to the existing TEXT/UG diagnostic (2MeV T1(+) ions).

Additional information

Authors: TEUBEL A, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP III/214 EN (1996) 34pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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