Faraday cup analysis of ion beams produced by a dense plasma focus

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Abstract
The design and performance of a Faraday cup which is used in a time‐of‐flight technique to measure the energy spectrum of ions accelerated away from the anode of a plasma focus are described. The cup is located in a differentially pumped (<20 μ) chamber which is separated from the main plasma focus chamber by a 0.0457‐cm diam hole positioned 16 cm above the anode. This arrangement allows a bias voltage of −400 V to be applied to the cup to stop comoving electrons and permits the observation of deuteron energies down to ∼25 keV.