LENS MASS-SPECTROMETER LEAK DETECTOR
A new mass-spectrometer leak detector based on the use of an iron- shrouded axially symmetrical magnetic lens for focusing ions in the low mass range was investigated. By taking precautions to keep the hydrogen background at a low and stable level (by the use of a mercury-vapor pump, liquid-air traps, and clean construction) it was possible to use hydrogen as a search gas. Leaks of 5 x 10/sup -10/ torr liter/sec correspending to an indication of a change in ion current reading of about 3 x 10/sup -13/ amp (for hydrogen) were consistently detected with an almost instantaneous response when testing equipment of a few liters volume using either hydrogen or helium as search gas. Some measurements of the mass spectrum obtained with this instrument are given. A very reliable and convenient version of a compressedpowder leak is also described. (auth)
- Research Organization:
- Edwards High Vacuum Ltd., Crawley, Sussex, Eng.
- NSA Number:
- NSA-15-005193
- OSTI ID:
- 4114383
- Journal Information:
- J. Sci. Instr., Journal Name: J. Sci. Instr. Vol. Vol: 37
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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