2. Cryo equipment strategy in the R2E context
Juan Casas & Nikolaos Trikoupis
CERN TE-CRG
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

3. Overview Radiation-Hard instruments Radiation-tolerant electronics
Most instruments suitable for the LHC environment
However valve positioners not properly qualified About 1’400 installed in the tunnel
Radiation-tolerant electronics
Strategy to monitor an eventual degradation
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

4. Rad-Hard: Valve positioner Issue
Is it a radiation-Hard instrument?
One valve positioner tested in Fraunhofer Co-60 gamma till 100 kGy during 12:31 hour Passive/no on-line monitoring => Failure at end of test
Valve positioners are everywhere in the tunnel Most critical nearby DFBx
100 kGy is not that higher than worst areas!!
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

5. Rad-Hard: Valve positioner Issue Estimated TID for P1-P5-P7: 2016 till Aug 7
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

6. Rad-Hard: Valve positioner Issue Passive TID monitoring since 13th Sept
RadFETs installed in P1 & P5
To be measured during next TS (1st time)
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

7. Rad-Hard: Valve positioner Issue
Is it a radiation-Hard instrument?
One valve positioner tested in Fraunhofer Co-60 gamma till 100 kGy during 12:31 hour => Failure at end of test
Valve positioners are everywhere in the tunnel Most critical nearby DFBx
100 kGy is not that higher than worst areas!!
Next steps:
Set irradiation requirements TID? <= defined experimentally from LHC RadFETs
Select appropriate irradiation area
Prepare test set-up with on-line monitoring => determine TID withstand level
Define operational strategy
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

8. Rad-Hard: Other Instruments in LSS
Qualified cryo-sensors:
Temperature sensors, maximum test dose about 3 x 1014 n/cm2 Most CANNOT BE REPAIRED
Pressure sensors: qualified in TCC2
No indication of radiation damage
Instruments deemed rad-hard by construction/design
Level gauges based in a superconducting wire Same technology as magnet
Solenoid proportional valves Made of a coil & a magnetic plunger
Electrical heaters: wire-wound or foil resistance ……
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

9. Rad-Tol: Electronics
The electronics deployed in the tunnel is designed by using individually qualified components to withstand the LHC tunnel environment.
The electronics is installed in the:
LHC tunnel along DS & ARC
LHC protected areas for commercial equipment & LSS instruments
Radiation effects on cryo electronics:
SEU: observed in protected areas => end-2011 consolidated
TID produce drift: is it observable?
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

10. Rad-Tol: Electronics TID effects:
Power consumption on crates from cell 9 to 14 in P1, P3, P5 & P7:
Power monitored from time to time, but changes too small to not rule out thermal origin.
Strategy during next period:
Measure power consumption for individual cards In regions deemed critical
On “high” radiation areas leave equipment to asses maximum TID withstand level
If TID effects become non-negligible => exchange equipment => Shift equipment from low to high TID areas
End of life may at the end be due not to radiation effects.
WFIP comm: ~280 spare over 1086 installed Nevertheless a nanoFIP alternative is foreseen (later)
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG

11. Summary TID may be an issue for cryogenic valve actuators in P1 & P5
A radiation qualification campaign is critical to establish an operational strategy. The next steps are:
Determine TID for test
Evaluate radiation hardness
Establish operational scenario that can be:
Leave as is
Periodical exchange
Move sensitive equipment by a few meters (not so difficult)
For rad-tol electronics there is no particular issue, most probably the end of life is independent of the TID.
Cryo equipment strategy in the R2E context-2016
JCC-TE/CRG