Field emission from carbon nanotubes in DC and pulsed mode |
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Authors: | F Le Pimpec C GoughV Chouhan S Kato |
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Affiliation: | a Paul Scherrer Institute, 5232 Villigen, Switzerland b The Graduate University for Advanced Studies, 1-1 Ohho, Tsukuba 305-0801, Japan c High Energy Accelerator Research Organization (KEK), 1-1 Ohho, Tsukuba 305-0801, Japan |
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Abstract: | Multi-wall Carbon Nanotube (CNT) emitters were tested in a combined diode-RF electron gun. Field emission of the nanotubes was observed at 5-30 MV/m, using a 250 ns FWHM long pulse with a peak voltage of 80-470 kV. The field emission threshold is compatible with that found from previous DC testing. We have extracted from a continuous field emitter up to a nanoCoulomb of charge and measured an emittance of 4 mm mrad with a 2 pC electron beam. The total charge emission during RF operation, using the 1.5 GHz, 2 cell RF structure, was found dependent on its period. RF operation showed that back bombarding electrons with up to 5 MeV did not impair the emission stability of the CNTs. |
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Keywords: | Carbon nanotube Field emitter array Field emission High gradient |
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