Thin foil Faraday collector under burning plasma reactor like conditions

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We are investigating thin foil Faraday collectors as a diagnostic for lost alpha particles from high yield d-t tokamak fusion plasmas. One advantage of this concept is the predicted ability to operate under fairly high neutron/gamma radiation backgrounds. We have tested this prediction by measuring the current from a thin (2.5 n) Ni foil placed in the core of the TRIGA fission reactor at the Denver Federal Center. At a maximum steady state power of 950 kW (1E13 n/cm2/s) a current of 1.2 nA/cm2 was measured. This measured current at the maximum power is somewhat larger than the calculated current (0.5 nA/cm2). These results, future planned measurements, and the application of this diagnostic to proposed burning plasma (BPX) experiments will be discussed.

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