Elektronenoptische Herstellung freitragender Mikrogitter

An alternative simulation approach for surface flashover in a vacuum using a 1D2V continuum and kinetic model

“…The above processes can be depicted by an analytical model based on single-particle analyses, i.e. the SEEA analytical expression [23]. For a SE emitted in direction perpendicular to the insulator surface, its time of flight is t ef = 2 2A 0 /me/ |aex| and the traveled distance l ef = 0.5aeyt 2 ef , with the initial energy A 0 and the vertical and parallel acceleration aex and aey.…”

“…For a fully developed SEEA, the electron energy upon arriving at insulator again must be A 1 , the required energy to produce one new SE. Therefore, the following equation must be satisfied [23]:…”

“…In SSEE, the average SEE yield (SEEY) is one, meaning that one newly created SE, after being accelerated by the parallel electric field E y , always induces another SE upon collision with an insulator. The assumption of the SSEE stage was also employed in the single-particle analyses of the SEEA process originally developed by Boersch et al [23]. The considered dimensions (x, v x , v y ) in the simulation model are as shown in figure 1.…”

“…The emitted electrons are accelerated by the applied field and induce secondary electron emission (SEE) on the insulator surface. An avalanche occurs when the created secondary electron (SE) continues to produce more SEs while charging the insulator surface positively [23]. A final breakdown is only possible after consistent electron collisions with an insulator unleash neutrals that were previously adsorbed in the insulator, and a final plasma breakdown within the local high-pressure region occurs [24].…”