Registration Number
0222U005302,
0121U110548
, R & D reports
Title
An influence of the cathode surface morphology on the dark current and high-gradient high-vacuum breakdown of the accelerating structures
popup.stage_title
Head
Lebedynskyi Serhii O., Кандидат фізико-математичних наук
Registration Date
27-12-2022
Organization
Institute of Applied Physics National Academy of Sciences of Ukraine
popup.description2
A model of a double potential barrier is proposed, which takes into account additional mechanisms of high-gradient breakdowns in accelerating structures. It is shown that the field emission current from a two-layer metal system with a coating thickness of nanometer dimensions has an oscillatory resonant character. The dependence of the tip heating process on the dimensional effects is shown, in particular, the melting of the emitter tip, taking into account the size of the tip, begins for current densities an order of magnitude smaller than for the case without taking into account the dimensional effects. It is shown that the process of sublimation of neutral atoms from the cathode surface until the melting of the emitter tip weakly affects the temperature distribution, since the relative temperature difference without and with sublimation is 0.1 μK. It is numerically shown that taking into account the Nottingham effect leads to a decrease in the intensity of the breakdown electric field, so for a field gain of the order of 50 the decrease is about 10%.
Product Description
popup.authors
Diachenko Mykhailo M.
Lebedynska Yuliia S.
Lebedynskyi Serhii O.
Musienko Igor I.
Khelemelia Oleksii V.
popup.nrat_date
2022-12-27
