1. LHC Beam Vacuum activities during YETS 2017-18 + LS2
G. Bregliozzi - E. Page on behalf of TE-VSC-BVO
Tuesday 3 October 2017

2. Outline LHC tunnel during YETS 2017-18 activities
LHC tunnel during LS2 (known) activities

3. TE-VSC-BVO activities
Yearly End Technical Stop

4. Overview of YETS YETS activities in the LSS
LSS 1 Installation of Two Wire Collimators in IP1 for Long Range Beam-Beam Compensation (LHC-TC-EC-0009)  new layout in A5L1 ; existing slot in B4R1.R vacuum sector.
3.5 weeks for A5L1
3 weeks for B4R1.R
A5L1.R layout before modification
A5L1.R layout after modification

5. Overview of YETS activities in the LSS
Maintenance of 22 sector valves: consist in replacing wearing parts on the external side of the valve.
2.5 week
Changed components
Cut of piston area
Easy access!

6. Overview of YETS activities in the LSS
BSRT & Wire scanner maintenance in 5L4, 5R4 ???
Possible installation of beam gas fluorescence monitor in 5L4 BGI area  layout slightly modified…
2.5 weeks per sector
3 weeks
5L4 BGI area

7. Overview of YETS activities in the LSS
LSS 7 Replacement of one Primary Crystal Collimator (TCPC) in IR7 (LHC-TC-EC-0010)  slot not yet defined!
3 weeks
LSS8
VMSIN.156.6R8.R RF finger exchange
3 weeks
A6R8 between BTV and MSI
A6R8 between BTV and MSI

8. Overview of YETS activities in the LSS
Exchange of LHC Kicker Magnet MKI8D (LHC-MKI-EC-0003  vent and bake-NEG activate adjacent sectors)
3 weeks

9. Overview of YETS activities in the Cryogenic Installation
Gas analysis during ARC 1-2 warm-up to 80K  results will condition the full warm up;
Access during the xmas break when TCB  240K for RGA scan;
Add pumping groups in 8 different positions on the 2 beam lines;
RF balls on V1 and V2 & final leak detection.
Pumping stations will be installed in SAM Q5L8
ITs status during the YETS?
Beam Screen Flushing for 6-8h:
TIN 80K - TOUT 60K
TCB ARCs & Its < 3K & TCB 4.5K

10. Overview of YETS activities in the EXPERIMENTAL areas
ATLAS, CMS & LHCb Neon venting first weeks of the YETS
ATLAS & CMS Detector opening support
Last 2 weeks of the YETS pump down of the Neon: dates should be checked with each experiments

11. TE-VSC-BVO activities
LS2 2019

12. LS2 HL-LHC: Collimators & Absorbers
LSS1 & LSS5: Replace 4 TCTPH by TCTPM
LSS7:
Replace 4 TCP by TCPPM
Install 8 new TCSPM
TCAP: not yet defined
TCPCV: the activities for the goniometers are not yet clear

13. LS2 HL-LHC: TCDIS
N.B.: Floor status need to checked in advance

14. LS2 HL-LHC: 11T Activities
LSS2 & LSS7: New 4 TCLD collimators
TCLD.11R2.B in connection cryostat LEIR.11.R2
TCLD.11L2.R in connection cryostat LEIR.11.L2
TCLD.8R7.B in 11T dipole MB.B8R7
TCLD.8L7.R in 11T dipole MB.B8L7
In addition to that new sectorization for the new ARC: new gauges and cables needed

15. LS2 LIU: TI2 & TI8 Upgrade in LSS2 & 8
Replace 6 TCDI by 6 new TCDIL on each TI:
Complete new layout with new sectorization from TED

16. LS2 HL-LHC: TANB A4L8 & A4R8 Upgrade D2 VAB TANB TCTPH TCTPV BPMs
A4L8 proposed layout
BPMs
Y-CHAMBER
N.B.: Floor status need to checked in advance

17. LS2 HL-LHC: TCLIA
N.B.: Floor status need to checked in advance

18. Activities to be updated
PLAN 11091: Prototype wire scanner in the LHC - Not in the baseline anymore?
PLAN 10645: Second BGV Detector for HL- LHC - Not in the baseline anymore?
PLAN 10627: Prototype Head-Tail Monitor - No info!
PLAN 10066: 4 High bandwidth BPMs - No info!
PLAN xxx: Maintenances of BSRT - No info!

19. Activities not yet clear: Open questions
New BGC system?
New sectorization of BWS?
What’s about AFP and Roman Pot?
What’s about the BGIs?
What's about the MQW modification in LSS7?
Possible exchange of both LHC dump core?
Support to EN-STI + Venting & pump down of CTD

20. VSC Activities for LS2 in the LSS
LSS 5 (possible also LSS1) Re-sectorization between TAN and D1 at 4L5 and 4R5  the objective is to be able to vent D1 without venting TAN (2.5 week of bakeout=3 to 4 weeks of intervention depending of the job)
Current layout
Proposed layout
N.B.: Floor status need to checked in advance

21. VSC Activities & Consolidation ARCs
A global/partial leak detection of the PIMs should be planned with the Diode activities
A complete consolidation of pumping ports with valves will be put in place on each ARCs
Complete consolidation of pumping ports of SAMs that are in the same location of the pressure relive valves and aC coating of RF insert at the extremities.
Endoscopy activities when requested and in 15R8 for ULO
Plus standard RF ball and pump down and leak detection
For mechanical activities like magnets exchange: VSC-DLM will be in charge

22. VSC Consolidation & Maintenances
LSS6:
Complete the consolidation plans for the MKB:
Installation of 2 additional TMP on Tank 1 and 5
Exchange/Inspection of some ion pumps
Bake-out of accidental venting of vacuum sector IP6 and A4R6 during TS2 of 2016
LSS2 and LSS8:
1. Consolidation of the vacuum sector A6R8 & A6L2 for RF fingers problem
Consolidation should be done in parallel to the TI2 and TI8 activities
2. Consolidation of all sector valves

23. LHC Experiments: ALICE
A prime goal of the ALICE Phase II upgrade is a significant improvement of the track impact parameter resolution: significantly reduce the beam pipe diameter and reduced wall thickness
Design, procure and test beam vacuum equipment for new IP2 layout (including tooling, bake-out equipment etc.).
Completely dismount IP2.X, A1L2.X (RB24) sector.
Vent and partially dismount A1R2.X sector.
Install new aluminium/beryllium central beam pipe.
Install new vacuum layout in sector RB 24 and A1R2.X.
NEG activation and re-commissioning of the sector.
WP: EDMS

24. LHC Experiments: ATLAS
Primary goal of the ATLAS Phase II is to modify existing vacuum layout (LS1 installation) in order to allow installation of next detection layer. Also according to the ALARA principle implement remote actuation for vacuum chambers flanges and supports.
VC1T supports modification (due to LS3 VAX) and corresponding JF shielding modification.
Participate on opening/closing activities.
Dismount VC1AP and VC1AX chambers, procure rebuild and perform vacuum testing.
Install new vacuum layout with modified chambers.
NEG activation and re-commissioning of the sector.
WP: EDMS

25. LHC Experiments: LHCb
A prime goal during the LS2 is to support LHCb during the VELO upgrade. This includes safe removal, re-installation and re- commissioning of UX85/1 – 4 vacuum chambers. Also according to the ALARA principle BVO, will replace upstream copper chamber with a new aluminium design.
1. Provide consultancy and support for VELO upgrade.
2. Temporary removal of UX85/1 – 4 chambers.
3. Replace upstream copper chamber with aluminium chamber.
4. Install an additional bake-out system on UX85/3 RICH2 section.
5. Re-install UX85/1 – 4 chambers.
6. NEG activation and re-commissioning.
WP: EDMS

26. LHC Experiments: CMS
Main goal of the CMS Phase II is to design, procure and install new ‘low-mass’ end-cap, forward, CT2 and IP beam pipes. Replacement of these chambers by aluminium thin-wall design and beryllium will meet aperture requirements for post-TOTEM period and in order with ALARA principle reduce radiation dose to personnel.
Design, procure and test beam vacuum equipment for new IP5 layout (including tooling, bake-out equipment etc.).
Participate on all opening/closing actions.
Dismount existing endcap and forward chambers.
Install new layout with aluminium chambers.
NEG activation and re-commissioning of the sector.
WP: EDMS

27. Bonus slides

28. The LHC in numbers LSS: some numbers
Remarquable d’avoir 16% de la machine à Temp ambiante. YETS et EYETS se concentrent sur ces 16%
Les lignes de dump font chacune 980 m de long. 44 VPIC dans les lignes de dump.
Courtesy of V. Baglin with 2017 update of E. Page

29. Overview of YETS? or LS2 activities in the LSS
LSS 2 Removal of solenoids and installation of aC coated RF insert at the extremities of Q5R2 (LHC-V-EC-0007)