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Persistent URL http://purl.org/net/epubs/work/32008788
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Record Id 32008788
Title Simulations of Field Emitted Dark Current Dynamics in DC Photoinjectors
Abstract Field emission is a concern in injectors with DC photoelectron guns because of the constant generation of dark current, which is accelerated down the beam line and can deteriorate the photoemitted bunch quality and lead to hardware damage. Simulations were carried out on the co-propagation of a field emitted, dark current halo and a photoemitted bunch in a typical 350 kV gun as used in an ERL or FEL injector, followed by a single cell buncher cavity. The photoemitted bunch repelled the halo longitudinally, leaving the area in the centre of the bunch with very low dark current, surrounded by two peaks of relatively high current at the front and back of the bunch. The peaks in current occur at all levels of dark current and were about 3.5 times the amplitude of the undisturbed dark current. The buncher caused the dark current to overcompress, forming a 'ghost' pulse an order of magnitude larger than the initial level of dark current, in front of the photoemitted bunch.
Organisation ASTeC , STFC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, 8-13 May 2016, (2016): 3971-3974. http://accelconf.…/papers/thpow018.pdf 2016