Mineral insulated gauge cable irradiated in the SPring-8 storage ring

Precise method of compensating radiation-induced errors in a hot-cathode-ionization gauge with correcting electrode

“…[6] To overcome this problem, a hot-cathode-ionization-gauge head with correcting electrode [2] was developed and was operated by an existing vacuum-gauge controller together with an automated-pressure-compensating circuit, [3] a shield tube, and a vacuum-gauge cable with long-term resistance to radiation. [7,8] In simulation experiments with excess electrons and with actual synchrotron radiation, the method could displayed the resulting pressure with a pressure measurement error of less than 22 %. [3,4,9] However the method based on an approximate formula was restricted to use in a specific pressure range, related to the influx of photoelectrons, and displayed large errors for pressures below 8 10 -8 Pa. [3,9] Furthermore to solve these problems, a precise method [5] based on an exact formula, was developed without use of the shield tube and the existing vacuum-gauge controller together with the automated-pressure-compensating circuit.…”

Preliminary Failure Modes and Effects Analysis of the US Massive Gas Injection Disruption Mitigation System Design

“…Additional work to determine a failure rate for mineral insulated cables rather than traditional cables will be undertaken as the design progresses. Mineral insulated cable is reputed to be radiation resistant, for example Saeki (2001) discussed that the conventional polymer insulation for a vacuum gauge cable embrittled and failed at 55 Mrads radiation exposure in service on a particle accelerator, while a Co-60 test of a mineral insulated cable (the leading candidate option to replace the failed cable) showed no cable insulation degradation at 190 Mrads exposure.…”