1. X X X QURA PLC X RM01_R X RM01_L Long-Term?: QURC(A,B) QUI (-1)
New BLM + BatMon Monitors
(~1mGy/s during high intensity fills)
Cumulative radiation levels: few 1E6cm-2 (still fairly low!)
QURA PLC X
Towards US85:
Factor ~5-10 less X
RM01_R
New BLM + BatMon Monitors X X
RM01_L X
Long-Term?:
QURC(A,B)
QUI (-1)
CRYO RF (-0.5)
New BLM + BatMon Monitor

2. P4 Radiation Levels
~2-6x105cm-2 at PLC location TS TS TS
~1-3x105cm-2 at PLC location
2nd Failure
1st Failure
Vacuum activity higher after TS and with higher intensity -> long-term study important

3. P4 Radiation Levels Beam-Gas Interactions (levels decrease fast)
Up to 1mGy/s
Beam-Gas Interactions (levels decrease fast)
New installed BLMs have noise, but fills are nicely visible
1mGy/s versus RadMon readings -> analysis ongoing

4. P4 PLC Considerations
Failures occurred during beam-on, in a period when the UX45 RadMons counted
Radiation levels still very low at location of the PLC (~a few years of surface equivalent)
Failure signature compatible with SEU, 2nd failure observed in same location; radiation test could confirm high sensitivity
Additional monitoring was installed during the last TS (many thanks to BLM and RadMon teams!) to evaluate mid/long-term radiation evolution (25ns!)
Most exposed equipment is in UX45 and relocation requirements are to be evaluated

5. Observed Radiation Levels
© MCWG (M. Calviani et al.)

6. Observed Radiation Levels
© MCWG (M. Calviani et al.)

7. Post-Mortem DB & RadWG List
Post-Mortem database: RadWG list (link) and PM-DB (link) fully synchronized and mostly iterated with equipment owners
Many Thanks to: Rafal, Markus Z., Reiner, Marco, Julien, Giovanni !!!

8. SEE ‘Events’ Since last TS
QPS [5/1+1/14]
nQPS
mFIP
DQQDI and DDQDG
Cryo [2/2+2/3]
Temperature Sensor Probem (mitigation currently tested)
PLC US45 (radiation levels are low, but 2nd case)
Valves + Control (rather electrical problem)
Power-Converter [2]
Auxiliary power-supply (600A) – didn’t dump the beam?
Collimation [1]
collimation control affecting TCTVA position (stuck bit?)
Vacuum [1/0]
PLC problem in UA27 (unlikely, but to be checked)
[Dump/App. +???/Mitig.]

9. QPS Failure Rate Evolution
© R. Denz et al.
ISO150 patch solution applied in critical locations

10. Cryogenics: Failure Rate Evolution
© S. Claudet et al.
Cryogenics patch solution for DFB logic in place (P1, P5 and P7), works perfectly!
Fix for temperature sensors of current leads: currently tested in P5 [TT893 only]

11. SEE Failure Rate Evolution
Cryogenics patch solution for DFB logic in place (P1, P5 and P7), works perfectly! Temperature sensors for current leads: currently tested in P5 [top of lead only] (S. Claudet)
PIC PLC relocation performed in P1 (M. Zerlauth)

12. SEE Failure Rate Evolution
???
ISO150 Patch
Slope: ~1SEE_dump per 60pb-1
Only 100% SEE Cases (e.g., not PIC, not PLCs,…)
Cryogenics patch solution for DFB logic in place (P1, P5 and P7), works perfectly! Temperature sensors for current leads: currently tested in P5 [top of lead only] (S. Claudet)
PIC PLC relocation performed in P1 (M. Zerlauth)