1. Proposed integration of cryo BLMs in LHC during LS1 V.Parma, CERN, TE-MSC With contributions/input from: M.Sapinski (BE-BI) Th.Renaglia (EN-MME) N.Bourcey (& SIT team), A.Musso, J.M.Gomes de Faria, J.Ph.Tock (TE-MSC) LSC, 11 th October 2013

2. First installation of BLMs in Q7R3 spare (not installed)

3. New integration study (in tunnel): Dipole (HCLBARA000-IN001052) (Th.Renaglia, EN-MME ) Indicative routing (to be adapted in situ)

4. Trials on mock-up (Bd.180, N.Bourcey et al.)

5. Additional Heat Loads Solid conduction to 2 K (per unit): 2.72W (8x0.34W) This is equivalent to the static HL at 2 K of 10-m of cryostat No HL to 50-75 K (no thermalization) Coaxial cables (3-m length each)

6. Schedule and resources Installation slot retained: last week October/1 st week November (discussed with J.Ph.Tock, considered feasible as far as SMACC constraints) BLM detectors are being prepared in Russia/CERN (BE-BI) Installation work (per unit): 6.5 full-time working days – Installation of special DN200 flange: 1.5 days ½ preparation (un-painting, etc.) (Alfa-Omega) 1 day execution (Alfa-Omega) Weld inspections (EN-MME) – Installation of BLM supports on end caps: 1 day Protecting work zone, positioning supports (SIT) Tack welding (SIT) Survey measurement of BLM’s locations (ABP-SU) – Installation of BLMs: 3 days Mounting of BLM detectors (BE-BI) Insertion of coax cables, fixing to BLMs, forming of cables (SIT+BE-BI) Connectors connection, flange closing, electrical checks (SIT+BE-BI) – Leak testing: 1 day DN200 weld to vac.vessel (VSC) Elbow/flange/connector feed-throughs checks (VSC) Integrated planning should avoid co-activity and conflict in resources usage

7. Summary and Next Steps Summary In situ BLMs integration on 2 units is feasible and with a moderate impact on LS1 resources/planning Possible installation slot: last week October/1 st week November Most components are available Presented in TETM, on 8 th October last Seek go-ahead from the LSC Next steps: Circulate ECR (ready) for approval  ECO Organize the implementation (through SMACC meeting) Intervention implementation/follow-up/documentation

8. Thank you

9. Spare slides

10. BLMs in Q7R3

11. Background Cryo-BLMs presented to TETM on September 4, 2012, with a proposal of installation of BLMs on Q7R3 Q7R3 considered very interesting because of strong integrated loss New Q7R3 was in assembly as a spare, so detectors were installed, rather easily but… Did not pass cold test  will not be installed in the machine  ! So: Alternative solution studied for installation in the tunnel Proposed locations from BE-BI (M.Sapinski & Co.): cryo-BLMs in 2 locations: – Cell 11R1: on the upstream end-cover of the connection cryostat (HCLEHR_000- CR000001, IC slot QBEI.11R1) – Cell 9R7: on the upstream end-cover of the 1 st MB(A) (HCLBARA000-IN001052, IC slot QQBI.9R7), (or alternatively on the 2 nd MB(B))

12. New integration study (in tunnel): Connection Cryostat (HCLEHR_000-CR000001) (Th.Renaglia, EN-MME ) Indicative routing (to be adapted in situ)

13. List of supplies and status 2x 4 BLM detectors: being finalized in Russia/CERN (BE-BI) 2x 8 coax cables (+spares): available (BE-BI) 2x 1 DN200 flange (item 14): available (EN-MME) 2x 1 elbow pipe (item 12): available (BE-BI) 2x 1 instrumentation feed-through flange (item 13): available (BE-BI) 2x 2 IC thermal shields: to be prepared (1/2 day work): TE-MSC

14. What if ? #Assembly step IssueLikelihood/ImpactMitigation/repair 1DN200 drilling/weld Excessive flange deformation (for O-ring sealing) Possible/ModerateRe-machining (standard operation) 2Weld inspectionWeld defects identifiedPossible/Minor-ModerateWeld repair (standard operation) 3Installation/for ming of coaxial cables Difficulty in forming to nominal shape  thermal contacts with vacuum vessel Likely/ModerateReshaping, addition of insulating spacers  extra time and re-scheduling 4Installation/for ming of coaxial cables Breaking of coaxialRemote/MajorReplace with spare  extra time and re- scheduling 5Final electrical test Fails to pass electrical testsPossible/MajorReplace with spares (BLM/coax)  extra time and re-scheduling 6Leak detection Leak at weld Leak at flange connectors Possible/Major Repair weld (standard operation) Replace connector or flange with spares 7 - Unforeseen issue after closing of IC (electrical/mechanical/vacuum, etc.) disrupting work organization or other machine functionality Remote/UnknownRemove elbow/connector flange, cut coaxial cables and close DN200 with blank flange. Ranking: Likelihood: Remote  Possible  Likely Impact: Minor  Moderate  Major