AVS 51st International Symposium
    Vacuum Technology Wednesday Sessions
       Session VT-WeM

Paper VT-WeM8
Pressure Compensation for a Radiation-Induced Current Caused in a Vacuum Gauge Cable in the SPring-8 Storage Ring

Wednesday, November 17, 2004, 10:40 am, Room 303D

Session: Contamination Control, Outgassing and Modeling
Presenter: T. Magome, Japan Synchrotron Radiation Research Institute, Japan
Authors: T. Magome, Japan Synchrotron Radiation Research Institute, Japan
H. Saeki, Japan Synchrotron Radiation Research Institute, Japan
Correspondent: Click to Email
Several hot-cathode-ionization gauges (B-A gauges) located near photon absorbers, have been under a radiation environment with a dose rate less than 1.8x10@super 2@Gy@sub air@/Ahr in the SPring-8 storage ring. A pressure-measurement error caused by a radiation-induced current in a collector cable, has been observed as a low-pressure indication in this environment. To find an actual pressure, such a pressure-measurement error in the collector cable was compensated using a radiation-induced current measured with a reference cable. As the result, the compensated pressure showed the actual pressure with a ±24% error in the pressure range from 10@super -9@Pa to 10@super -8@Pa in a stored-electron-beam condition. Furthermore a new cancellation method using a single signal cable will be tested in near future.