High-voltage lead-through for particle-beam apparatus

Details High-voltage lead-through for particle-beam apparatus High-voltage lead-through for particle-beam apparatus

1991-05-22

1992-07-28

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313456, 313250, 313247, 313257, 313268, H01J 1944

Patent

active

051343398

ABSTRACT:
The invention is directed to a high-voltage lead-through arrangement for introducing a high voltage into an enclosure wherein a vacuum is maintained such as for particle-beam apparatus. The arrangement includes: a high-voltage electrode for carrying a high potential; an insulator enclosing the high-voltage electrode and having a surface defining a boundary with the vacuum; and, an outer low-voltage electrode surrounding the insulator for carrying a low potential. The electrodes are spaced from each other by an electrode spacing measured along the surface of the insulator. The high-voltage electrode and the insulator conjointly define a first region wherein the high potential is present to a good approximation; and the first region is bounded by the insulator surface for a first distance of up to approximately 1/10 of the electrode spacing. The low-voltage electrode and the insulator conjointly define a second region wherein the low potential is present to a good approximation and the second region is bounded by the insulator surface for a second distance of up to approximately 1/10 of the electrode spacing. With this arrangement, the high-voltage lead-through can be operated at a higher voltage than the known configurations without the occurrence of micro-discharges.

REFERENCES:
patent: 2305458 (1942-12-01), Ruska et al.

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