Measurements of the alpha particle induced current in metal foils
We have investigated the use of a 1.3 mCi 244Cm source as a reproduction of a lost α particle ﬂux from high temperature fusion plasma. The purpose of the experiment was to allow the testing of thin-foil Faraday collectors as a lost α particle diagnostic. Many sets of measurements were made: the ﬁrst with a single thick Al sheet and subsequently with a thin (2.5 µm) Ni foil backed by a thick Al sheet under varying conditions. The measurements were made with a commercial Keithley picoammeter and with a custom built high precision current integrator. Measurements were made at pressures between 1 ...
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