DIRC protection wrt to radiation damage
Quartz bars >100 krad (Synthetic quartz instead of natural quartz)
PMTs Very hard
Electronics custom chips: very rough estimate of 5 Krad
No results yet
- Global protection : OK. No signal to protection logic
- 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.)
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.