Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989fuen.symps...2f&link_type=abstract
Presented at the 13th IEEE Symposium on Fusion Engineering, Knoxville, TN, 2-6 Oct. 1989
Other
Indicating Instruments, Leakage, Molecular Flow, Telescopes, Pressure Vessels, Reactor Materials, Scanning, Vacuum
Scientific paper
Conventional leak testing methods used to pinpoint the location of a leak become impossible whenever circumstances prevent local application of helium or other tracer gases to the outside surface of a vacuum system. This situation occurs frequently on tokamaks and other fusion devices due to close-fitting external hardware and/or vacuum vessel wall design, such as sandwich construction of inner and outer skins welded to corrugations. A solution to this type of leak detection problem is the leak telescope, a device still in the developmental stage, which detects leaks by sensing the direction of molecular flow from inside a vacuum system. Actually, the device senses all types of flow, whether it be from areas of high outgassing or virtual leaks as well as leaks from real surface penetrations. Using earlier work as a basis, a detailed model for describing the leak telescope was developed. An experimental setup was also developed to test the model. Experimental results show that a fairly primitive leak telescope can detect the position of relatively small leaks (i.e., 1 x 10(exp -5) torr-l/s) at large distances (i.e., 1m) in high vacuum (i.e., 1 x 10(exp -7) torr).
Fisher M. V.
Jensen Torben Haugaard
Puhn F. A.
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