Radiation Effects on High Current Diodes at Cryogenic Temperatures in an Accelerator Environment
The quench protection diodes for the proposed Large Hadron Collider at CERN will be located inside the He-II vessel of the magnet cryostat, where they could be exposed to a relatively high radiation dose. To determine the correspondence of neutron fluence results, obtained from experiments for the SSC, and the dose in an accelerator environment, several commercially available high current diodes of the DS6000 type from ABB and newly developed diodes of thin base region were irradiated at liquid nitrogen temperature in a target area of the SPS accelerator at CERN. The electrical characteristics of the diodes have been measured as a function of dose up to a maximum of about 600 Gy. After irradiation the diodes were submitted to current pulse annealing and to thermal annealing cycles up to temperatures of about 150 C. The results show that injection annealing alone can extend the service life of irradiated diodes quite substantially. The results are compared with the measurements from irradiation tests on diodes for the SSC, in a research reactor.
KeywordsLarge Hadron Collider Current Pulse Liquid Nitrogen Temperature Liquid Helium Temperature Forward Voltage
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