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Ceramic To Metal Technology

High Voltage Electron Gun Mount

120KV Tri-pole Heat-Exchanger Assembly

Client – MIT Research Lab

Application requirements:

  • Customer required an assembly which incorporated 3 ceramic breaks into a water-cooled base mount for a High-Power Electron Gun. The E-gun mount must operate at 120KV and remain electrically isolated from the base flange. The entire assembly requires liquid coolant to circulate thru the base flange to the E-gun mount. Three ceramic-to-metal breaks were used to form a tri-pole assembly which isolated the base flange from the high voltage, and maintained a full hermetic barrier for the ultra-high-vacuum environment.
  • Several dimensional tolerances regarding parallelism of sample flange to base flange, and locational tolerances for tapped holes and such on either.

Critical Issues:

  • The sub-assemblies required highly tolerance ceramic tubes, and careful fixturing to keep ends parallel.
  • Post-braze machining of the weld adapters was required to fit the flanges into the assembly and maintain parallelism of the plates.

Design Basis:

  • MPF considered ceramic break design for sub-assemblies which would withstand 130KV and provide structural support for the sample flange. These sub-assemblies would be brazed with weld cuffs, such that the 3 subs would then be assembled into the overall assembly using TIG welding.

Results:

  • The assembly was completed to exact specifications, and MPF was able to provide additional spare sub-assemblies (breaks with weld adapters). MIT installed the Heat-Exchanger in their system and proceeded with expected operations.



120KV Tri-pole Heat-Exchanger Assembly

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