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DIRC protection wrt to radiation damage

  1. Sensitivity
  2. Quartz bars >100 krad (Synthetic quartz instead of natural quartz)

    PMTs Very hard

    Electronics custom chips: very rough estimate of 5 Krad

  3. Exposure
  4. No results yet

  5. Protection
    1. Global protection : OK. No signal to protection logic
    2. Local protection Issue mentioned last week. Stability of the current: 1 uA

    Therefore quite easy to make a trip limit at 5 uA=2 MHz

    (Very high segmentation : 672 independant high voltage channels.)

  6. Monitoring
  • Two RadFETS channels will be implemented in January on two electronics crates at 3 and 9 oclock.

    The bars dose will be measured by the CsI RadFETs

  • Data monitoring: Light attenuation as function of z.

    Electronics : Threshold efficiency, noise.