1. Overview of the LHC Year End Technical Stop 2015-2016
Marzia Bernardini on behalf of Maria Barberan, Estrella Vergara and all the participants to the LHC YETS coordination meetings
17th November 2015

2. Summary
“The future belongs to those who prepare for it today.” Malcolm X
Introduction and Methodology
Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions

3. What about YETS ?
EDMS

4. Methodology
Coordination meetings are organised since September 2015 to prepare the YETS Indico:
The Groups and the Experiments presented the activities to be performed during the YETS (Maintenance, Consolidation and Projects)
The activities related to Experiments were presented and approved during the TREX on 5th November
A detailed schedule exists, including all the activities declared during the coordination meetings; it will be finalised by end of November
The details of powering tests are being studied, and they depend on the modifications realised during YETS
The activity of BE-CO are not yet integrated

5. Frame Introduction and Methodology Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions

6. CV maintenance – main dates (LHC & Experiments)
The frame
Cooling & Ventilation
3 weeks of stop for the SF, SU, UW (Mechanical cleaning of the cooling towers, Mechanical and electrical maintenance, Bugs fixing)
Intervention mostly on the surface, but also underground (US and UA) on the air handling units
ELQA investigations of the earth fault on the circuit RCS.A78B2
UPS TESTS on the whole machine
Activity approved during the LMC on 11th November
The tests can be done only after the cryo start
Powering conditions are needed from the 2nd March (circuits unlocked, CV and CRG in nominal conditions)
POWERING TESTS (4 days) & COLD CHECK OUT (3 days)
LHC points
Stop
Restart
Point 1
16th of Dec.15
19th of Jan.16
Point 18
tbd
Point 2
1st of Feb.16
19th of Feb.16
Point 3
22th of Feb.16
26th of Feb.16
Point 4
11th of Jan.16
29th of Jan.16
Point 5
14th of Dec.15
15th of Jan.16
Point 6
Point 7
22th of Feb. 16
Point 8
CV maintenance – main dates (LHC & Experiments)

7. CRG, example of main sequence of activity for the YETS
The frame
Cryogenics  details in Dimitri’s talk
The maintenance is needed on all cryoplants. Heavier maintenance and consolidation are needed in IP4 (A) & IP6 (A), heavy corrective maintenance (repairs) is needed in IP8 (B)
Cryostart / cryomaintain until 14 Dec (start of YETS)
The week 51 is dedicated to the stabilisation of the cryo conditions for the YETS
IP8 is needed asap to perform ELQA in sector 78 (investigations on the short to ground in sector 78)
IP4 is needed before 22nd of February to allow the RF conditioning (4wks requested, but only 3 wks available)
The operational BASELINE is to keep the Helium in the arcs, the magnets will be filled with LHe in cold standby at 3.5 K – 4 K
The LSSs will be in GHe at 20 K. The DFBs will be empty with the current leads in cold standby
The last cryostart will be back on 4 March (earlier in IP8 & IP4)
CRG, example of main sequence of activity for the YETS

8. Courtesy C. Tromel DGS-RP

9. The frame

10. Access Constraints Introduction and Methodology
Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions

11. Access constraints EN-EL The following tests will be realised:
AUG tests on the whole LHC machine, Meyrin, Prevessin, NA, …
The annual test of the electrical backup network (CERN wide)
The Auto-transfert test (LHC, Meyrin, PS, PSB, …)
GS-ASE
Annual tests of alarms: sirens, ODHs and evacuation alarms on the whole LHC machine & Experiments
During the tests above, there is no access in the machine, underground & surface
The tests will be performed mainly during the Christmas Break and the week ends
The DSO test is scheduled on Friday 26th February

12. Access constraints

13. Automatism & Circuit Breaker
Access constraints
EDMS:
LHC1 + ATLAS 25th January
PM18 12th February
LHC2 + ALICE 9th February
LHC3 5th February
BA80 23rd February
LHC4 6th January
BA81 24th February
LHC5 + CMS 5th January
BA th February
LHC6 14th January
LHC7 15th January
BA6 11th February
LHC8 + LHCb 7th January
Test AUG
Test Secours (10min)
All points on 17th December (7am)
Works on the
Automatism & Circuit Breaker
LHC5 + CMS 21st – 24th December
Auto Transfer Test
Previous & final works from 28th January
until 1st February (access possible)
No access LHC1 + ATLAS + LHC18 + SPS6 + SPS7 on 30th January (Saturday)
LHC1 31st December
LHC5 30th December
LHC2 24th December
LHC6 23rd December
LHC3 28th December
LHC7 21st December
LHC4 9th December
LHC8 22nd December
Safety Test

14. Projects and Consolidations
Introduction
Methodology
Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions
“ Coming together is a beginning.
Keeping together is progress.
Working together is success.”
Henry Ford.

15. 5th Axis Collimators EDMS LHC-TC-EC-0004
Activity on the critical path
12 Collimators will be removed and re-installed in LSS1 and in LSS5
The vacuum Layout will be modified, to recover the TCTP collimators’ 5th axis translation
Due to RP issue, the activity can only start on 4th January
It is a joint project between EN-STI and TE-VSC
The support is needed from BE-BI, EN-EL, DGS-RP, EN-HE, EN-MEF-SU
Several visits have been performed during the TS2 and TS3
TCTPV. 4R1.B2
TCTPV. 4L5.B1
3D integration view 4L1

16. TDI replacement
Activity on the critical path  details in Antonio’s talk
Waiting for Engineering Change Request and Engineering Specification
Minor contingency included in the Baseline
Support needed from TE-VSC, EN-HE, EN-MEF-SU
Several visits have been performed during the TS2 and TS3

17. Beam Instrumentation
Installation of the tent in LSS4, to protect the BGV - EDMS LHC-BGV-EC-0004
Provide mechanical protection
Protect the detector modules from external light
Reduce the air dew point
BSRT in LSS4
Modification of the optical calibration line used to align and adjust the BSRT telescope on Beam1
Replacement of existing BSRT tank and components
Waiting for an ECR from BE-BI
Additional rack needed in RA47, to improve maintenance operations
Cabling needed
ECR in progress
Change of ferrite of the Beam Wire Scanner in LSS4
BGV proposed protection tent
Wire scanner and ferrite

18. Scheduling issues in LSS4
Beam Instrumentation
Scheduling issues in LSS4
BSRT
The new mirror and other components should arrive for 20th Nov.
VSC qualification by 1st Dec (TBC)
If VSC can qualify the system in 2 weeks, then everything should be ready for installation by 14th Dec.
Change of Ferrite of the BWS
Latest news on ferrite delivery is that they will not be at CERN before 11th Jan.
Earliest installation date would be the 1st Feb
BOTH interventions (BSRT and BWS) can be performed during W51: the vacuum pump down and Neg activation could then be performed at the same time on both sectors
All works in LSS4 should be completed by 22nd February to allow RF conditioning
TE-VSC: any intervention in January and February depends on the evolution of activities on the critical path (5th axis collimators, …)  answer by mid January 

19. Machine protection QPS
Installation & commissioning of radiation tolerant detection systems for 600 A circuits in RR13,17,53,57,73 and 77
Installation & commissioning of new detection systems for circuits RU.L4 and RU.R4 (‘undulator’). Activity in conjunction with the upgrade of the corresponding current sensors performed by EE team during TS#3
Possible upgrade of the firmware for the nQPS DAQ systems allowing easier recovery from local bus errors (to be confirmed 436 units concerned). Locations: 8 sectors
ELQA
Study of a possible relocation in point 6 of the CL heater sources and the Proximity Equipment related to a possible displacement of the RQ5.L6 quad.
Checking and re-making, if required, the signal transmission line from the DQLCT of B23.L7, heater #1.
ELQA investigations of the earth fault on the circuit RCS.A78B2 (near DFB). Decision to be taken by LMC after recommendations by MP3. Following the accident of TS2, the safety procedure is being updated for the YETS
UPS tests in all Sectors

20. Other interventions TE-VSC
New Pumping configuration for the Inner Triplet 2L – EDMS LHC-VAZ-EC-0005
Installation of new Racks for the Vacuum Pilot Sector in LSS8L - EDMS LHC-VY-EC-0001
EN-HE: Integration of flood sensors located in the pit of the lifts – EDMS LHC-HHAAS-EC-0001
EN-EL: Cabling campaign to support the projects
EN-STI: Replacement of the collimator TCLA.D6L7 (LSS7), following the joint inspection (Survey and STI) performed during TS3
HSE (with the support of CV, CRG , EPC, …) Noise measurement in Point 2, during W51
GS-SE: Cleaning of the drain in UJ32
R2E: Shielding to be installed in the cable ducts between RA and UA, in LSS 6. Waiting for ECR
Pumping group to be installed in IT2L
Shielding in cable duct

21. Critical resources Introduction and Methodology
Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions

22. Bakeout teams over allocated!
Critical Resources
VSC (Beam Vacuum) is involved in the following activities:
Modification of Vacuum Layout to recover TCT Fifth Axis Translation at IP1 and IP5
Replacement of the TDI in LSS2 and LSS8
Installation of Atlas/AFP station in IP1
Replacement of the TCLA.D6R7
Modifications in the Vacuum pilot sector in IP8
Modification of BSRT in LSS4
Change of ferrite of the Beam Wire Scanner in LSS4
Can be performed only during W51
Bakeout teams over allocated!

23. Activities related to Experiments
Introduction and Methodology
Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions

24. Activities related to experiments
Point 1
ZDC Removal on W51
AFP RP Stations (LHC-XAFP-EC-0002):
Install C6R1
The works involve: cabling, drilling, vacuum modifications, commissioning
New Water Cooled Cables for ALFA (LHC-LJ-EC-0044)
Point 2
Lift replacement PX24 (LHC-HHAAS-EC-0007)
Safety procedure to access via PM25 LHC-HHAAS-ES-0003
AFP Roman pot stations
@ 205 and 217 m
Lift PX24
WCC for ALFA
@ RR13 and RR17
ZDC remote system

25. Activities related to experiments
Point 5
ZDC Removal on W51
TOTEM timing detector s. 45 & 56 (LHC-XRP-EC-0012):
Installation of TOTEM clock distribution and timing detectors starting on TS3 and progressively on YETS & TSx
CT-PPS timing & tracking s. 45 & 56 (LHC-XRP-EC-xxxx):
Waiting for an ECR
Installation of coax cable for clock distribution  Open issue
Installation of detector packages for both tracking and timing starting on YETS and progressively on TSx
Main services existing, but new installation of small racks & patch panels
LHC beam line for TOTEM:
Depending on pressure development the installation of a pump between Q5 and first Roman Pot unit 210 near might be necessary (sector 45 & 56)
CT-PPS cabling
ZDC: Crane in operation
TOTEM timing Detector

26. Last but not least
Maintenance*: RF, Kickers, Vacuum, Alignement, Power converters, and many others…
*Included in the detailed schedule:

27. Schedule Introduction and Methodology
Frame: CV, CRG, RP, Powering tests
Access constraints
Main changes in LHC: Projects and Consolidations
Critical resources
Activities related to Experiments
Schedule
Conclusions

28. YETS schedule overview

29. Conclusions
The YETS should be extended by minimum 3 days (until 16th March), to allow the UPS tests in the whole machine
The duration of the powering tests, needs to be validated
All the works in the LHC machine must be completed by 4th March
Four sectors (34, 45, 78 and 81) must be in powering conditions on 2nd March
The activities on the critical path are related to:
- 5th Axis collimators and its vacuum sectors
- the replacement of the TDI
The activities related to experiments in LSS5 need to be clarified. The coactivity with the 5th axis collimators could be an issue.
The critical resources are identified in the Vacuum team, due to the heavy support needed for the activities on the critical path
The baseline scenario (particularly for CRG) will be defined during the tomorrow LMC