公开(公告)号：US3604970A

公开(公告)日：1971-09-14

申请号：US3604970D

申请日：1968-10-14

Applicant: VARIAN ASSOCIATES

Inventor： CULBERTSON ROBERT D ,  MCRAE RUSSELL C ,  MEYN HAROLD P

IPC: H01J19/30 ,  H01J43/00

CPC classification number: H01J19/30 ,  H01J2893/002 ,  Y10S428/934 ,  Y10T428/12056 ,  Y10T428/12111 ,  Y10T428/12139 ,  Y10T428/12674 ,  Y10T428/12778 ,  Y10T428/12812

Abstract: A nonemissive electrode structure is disclosed together with a method for fabricating same. The nonelectron emissive electrode structure includes a core member which may be made of any one of a number of different metals such as molybdenum, copper, tantalum or tungsten. A nonelectron emissive material is deposited over the core metal. The nonemissive deposited layer may be any one of a number of different materials which will provide electron emission inhibiting characteristics in the presence of surface contamination by barium and/or strontium. Examples of such electron emission inhibiting materials include titanium, chromium, zirconium, or silicon. An outer coating of carbon is formed over the emission inhibiting layer to further enhance the nonelectron emissive characteristics of the electrode. Alternatively, the nonemissive deposited layer and carbon coating may be codeposited into a single covering layer deposited over the core material. The electrode structure is especially suitable as a grid structure in an electron discharge device employing either an oxide coated cathode or a dispenser cathode of the type containing barium and/or strontium.

公开(公告)号：US3611023A

公开(公告)日：1971-10-05

申请号：US3611023D

申请日：1970-02-19

Applicant: VARIAN ASSOCIATES

Inventor： SOUZA JESSE A JR ,  CULBERTSON ROBERT D

IPC: F42D1/05 ,  H03K3/537 ,  H03K17/52 ,  H05B37/00

CPC classification number: H03K17/52 ,  F42D1/05 ,  H03K3/537

Abstract: A circuit for triggering breakdown of an arc path through a gaseous atmosphere between a pair of spark gap defining electrodes is disclosed. The spark gap includes an auxiliary triggering electrode disposed between the pair of spark gap defining electrodes. A voltage divider network is connected across the pair of spark gap defining electrode with the output of the voltage divider being applied to the triggering electrode. The voltage divider includes a series connection of a first resistive means and a second resistive means. The first resistive means includes one or more four-layer diodes which switch rapidly from a nonconductive state to a conductive state at a certain threshold voltage applied thereacross, whereby when the potential applied across the spark gaping defining electrodes reaches a certain predetermined value the four-layer diodes break into conducting to apply the triggering output potential to the trigger electrode to trigger an arc across the pair of electrodes defining the spark gap.