Radiation Resistant Quench Protection Diodes for the LHC

  • D. Hagedorn
  • L. Coull
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

The quench protection diodes for the proposed Large Hadron Collider at CERN will be located inside the He-II vessel of the short straight section of one half cell, where they could be exposed to a radiation dose of about 50 kGy and a total neutron fluence of about 1015 n/cm2 over 10 years at temperatures of about 2 K. To investigate the influence of irradiation on the electrical characteristics of the diodes, newly developed diodes of thin base region of the diffusion type and of the epitaxial type have been submitted to irradiation tests at liquid nitrogen temperature in a target area of the SPS accelerator at CERN. The degradation of the electrical characteristics of the diodes for a radiation dose up to about 20 kGy and neutron fluence of up to about 51014 n/cm2 and the effect of carrier injection and thermal annealing after irradiation have been measured. The test results show that only the thin base diodes of the epitaxial type are really radiation resistant. A compromise must be found between required blocking characteristics and radiation resistance. Annealing by carrier injection and occasional warm up to room temperature can extend the service life of irradiated diodes quite substantially.

Keywords

Large Hadron Collider Current Pulse Base Width Carrier Injection Reverse Voltage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    D. Hagedorn and W. Nägele, Radiation effects on high current diodes at cryogenic temperatures in an accelerator environment, ICMC 91, Huntsville, Al.Google Scholar
  2. 2.
    D. Hagedorn, Radiation damage on high current by-pass diodes at cryogenic temperatures in an accelerator environment, CERN/AT-MA/92–10, LHCNote 188Google Scholar
  3. 3.
    H. Gerstenberg and W. Gläser, Studies of radiation effects after neutron irradiation at 4.6 K, Int. Conf. Irradiation Technology, 1992, Saclay, FranceGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • D. Hagedorn
    • 1
  • L. Coull
    • 1
  1. 1.European Organization for Nuclear ResearchCERNGeneva 23Switzerland

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