Vacuum instrumentation on the Daresbury synchrotron radiation source

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Abstract
The vacuum instrumentation for the ultrahigh vacuum system of the electron storage ring of the SRS is part of a complex, interlinked system under the control and supervision of a hierarchy of computers. The vacuum system has been in operation for over one year and has attained average base pressures of better than 5×10−8 Pa. The main pressure measurement devices are Bayard–Alpert ionization gauges and the operational precautions required in using such devices will be discussed. Quadrupole residual gas analyzers are used for partial pressure measurements and their use, particularly in the areas of leak detection and in the monitoring of the progress of bakeout of the ring, will be described. Projected data analysis facilities for residual gas analysis will also be discussed.

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