Measurements of shock wave flight times in long pipes

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Abstract
In order to determine the time interval between the catastrophic failure of a vacuum component and the arrival of the resulting shock wave at some critical point in the rest of a long vacuum pipe, e.g. the beam line system at a synchrotron radiation storage ring, experiments were performed with various entrance geometries and pipe diameters. Perhaps the most salient conclusion that can be drawn from these experiments is that a slit, e.g. the exit slit of a monochromator, serves very effectively to slow the shock wave. Thus if accidents can be restricted to the experimental chambers employed on beam line systems behind a monochromator, shock wave flight times of greater than 30 ms can be easily reached in a length of 3 m.

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