Evaluation of National Synchrotron Light Source beam line fast valve protection system
A fast valve designed and produced at Brookhaven National Laboratory for the National Synchrotron Light Source (NSLS) was evaluated for operational and system parameters. A functional prototype of a typical beam line was built to measure fast valve protection for simulated experimental beam line catastrophic vacuum failures. The fast valve, which was designed to stop shock wave propagation due to in-rushing gas, yielded a nitrogen leak rate from 0.5 to 0.02 Torr l/s during the first 3 s of beam line vacuum failure. An UHV all-metal electropneumatic valve in series with the fast valve will close and seal in less than 3 s. The fast valve closure time which measured between 4.5 and 6.5 ms from initially sensing the shock wave to closure of the fast valve did not significantly change after vacuum bakeouts to 200 /sup 0/C, repeated cycling, or shock wave operation. The fast valve firing circuit described sensed shock wave current from a miniature appendage ion pump and fired the fast valve in approximately 0.5 ms. Measurements were made for helium, nitrogen, argon, and air shock waves. Closing time and bounce were measured for several valves by sensing either laser or incandescant light during operation.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6487844
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Vol. 5:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NSLS
VALVES
OPERATION
PERFORMANCE
ARGON
DESIGN
EVALUATION
HELIUM
NITROGEN
SHOCK WAVES
ACCELERATORS
CONTROL EQUIPMENT
CYCLIC ACCELERATORS
ELEMENTS
EQUIPMENT
FLOW REGULATORS
FLUIDS
GASES
NONMETALS
RADIATION SOURCES
RARE GASES
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
420200* - Engineering- Facilities
Equipment
& Techniques