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Schematic of a wire emitter. Two stainless steel pins are fixed in position by a ceramics insulator. The pins bear the emitter wire spot-welded to their upper ends, serve to deliver high voltage and emitter heating current to the emitter wire, and allow to plunge the emitter onto the tip of the probe. Reproduced with kind permission from Chap. 8 in Ref. [63]. © Springer International Publishing, Cham, 2017.
