X X X QURA PLC X RM01_R X RM01_L Long-Term?: QURC(A,B) QUI (-1)

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Presentation transcript:

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

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

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

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

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

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

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 !!!

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.]

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

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]

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)

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)