HL-LHC & EN-EL Monthly follow-up - November 2026

Friday 30 Oct 2026, 16:00 → 17:30 Europe/Zurich

CERN

Davide Bozzini (CERN), Mario Parodi (CERN), Paolo Fessia (CERN)

Prepatory draft minutes November 2026 (to be compiled and cleaned during the meeting session)

General agenda of recurrent meetings presented:

• Overview of planning (short term and long term)
• Integration
• Power distribuiton
• DC cabling
• Decabling
• Optical fibres
• Cabling

Planning:

Integration: (detailed follow-up at the dedicated monday meeting)

o   Cable trays to be lowered at the level of separation door: not yet defined to be re-discussed at the integration meeting.
Probably solved. Still open and to be confirmed by Alejandro (CV). (action: HL coordination)

o   Flexwell cables: very fragile, HL asks to install as late as possible and after to protect with a cover. To be discussed later,
Diogo is studying the planning (proposal: keep for next follow up meeting)
Diogo to finalize the check of the design of the cable trays.
The campaigns are scheduled; the dates will be adapted to the works in the URs.
Joao will confirm that RF is going to purchase and install the patch panels.
This activity can be prepared at \study level and kept as a wild card activity.

Activity scheduled at end 2027, closed. Integration to be reviewd at the level of the UA (action: Diogo)..

o   Change in UPS size and proposed change in layout to be integrated and modifications required at the level of the hardware to be validated/integrated prior to execution. Integration done. Change in supporting structure will be done by EN-ACE under gluidelines of EN-EL (confirmed for point 1 and to be confirmed for point 5).
Closed, activity ongoing and under control

Power distribution:

o   EL to confirm the delivery dates of UPS and CPS, and to promptly report in case of delays, as the installation and commissioning dates have been booked in the planning 

UPS delivered but some internal elements still pending (insulating transofrmers expected by mid september, delivery of battery still unknown). 
The material is exoected by end of november.
For P1, due to the request of TE-CRG for wk 4 2027, in case of further delay a plan B will be deployed (temporary UPS)

Check if at P1 the UPS can be installed in UR15 (support not installed) and US17 (support already installed) (Action Dimitrios) - waiting for the rest of material
Check if at P1 the installation area in SD17 and SHM17 can be freed by TE-CRG (action: HL coordination)
Move the UPS in the final installation zone in the underground as soon as possible (action: Dimitrios). Done, closed.

o   Electrical lockout: EL has recently received some last-minute request for lockout, but MO personnel could not be available with a short notice.
The other groups need to be reminded that a lockout shall be requested with notice and shall be inserted in the IMPACT (action: HL cooridnation).
Action closed. EL will provide the slides for the ticketing system to rerquest of lockout, and EL+HL will double check the applicability of the ESP rules. 

o   Preparation of the core works: possible to anticipate the works of supply of the worksites, possible benefit to shave the Comsa's peaks in the workload.
Done, closed

o   In case of load transfer in the 18 kV substations that could potentially impact HL, dates to be communicated to HL coordination to avoid criticla operations in the same moment (action: e.g. SEM 11, Dimitrios to check with Mickael)
AUG test of LHC1 scheduled the 19th November, end at 14h00, to be confirmed
AUG test of LHC5 scheduled the 4th December, end at 13h00, to be confirmed
EN-EL project team will inform HL cooridnation about the end of the test to release the access to the underground facilities.

DC cabling:

o   Readiness of material: HL asks a status of the readiness and the procurement plan, to see if there are possible optimization or anticipation to the planning that can be proposed, as for WP6B some works related to the installation of the CDBs and power converters racks might be advanced as it is the case in L1.
A meeting will be organized (possibly in wk 48) to discuss the schedule.

We miss Class 5 cables (300 mm2) for 11 links, the supplier annonce wk 42 but it was already postponed, to be double checked.
Installation of metallic structures in 1L done, WCC inserted in 1L. All material needed for all other points seems to be available including clamps. It would be useful to have a list of components readiness.producer has been asked to provid class 6 by mid march. EN-EL asked to provide duration for finalizing works on both points. Week 27 to week 30 to be agreed according progress on both point s and EN-EL ressources availability.

Class 5 300mm2 to be received in week 47. (Received, closed.)

EN-EL want to include with the finalizing works of class 6 installation.
General request of HL for the material of the full scope WP17 DC cables: all material must be ordered with the required notice, and the subcontracted material to CERN groups (MME, ACE) must be monitored as the priority for them is elsewhere

o   Status of procurement of class 6 cables.

DO done, company selected, DAI in the hand of purchasing service. Delivery not yet confirmed, problems on procurement of raw material encountered. The supplier proposed to provide a first batch. EN-EL-CS to chekc how much could be provided to then adapt installation schedule.
Unfortunately no indication of delivery dates. IPT involved in the discussions with the supplier. No pre-series has been requested as Druseit got the contract, anyway samples will be requested before the final delivery.

 

Decabling: no specific points to discuss

o   EL, HL and Comsa have identified some resources that could be made available (2 per time) to anticipate with short notice part of the decabling works before the double shift

 

Optical fibres: no specific points to discuss

Cabling:

o Cable CLIQ could be patched

• • A mockup wil be built with 6 connections to be tested and validated. Samples have been delivered to MPT for testing. Diogo will participate tothe testing planned by mid-august. EN-EL-CS will also plan some mechanicla test.
    CLOSED: OK, MPT confirmed that the cables can be patched.. Solution validated
  • The document for the installation fo the new galleries segments can be prepared and be considered as wild card for ressourses alignment.
  • CLIQ in place in wk 44 and 45 at P1 (later at P5). Cabling works will be scheudled later (in 2027, baseline in May/June 2027, the possibilyty to anticipate in March 2027 will depend on the core works).

 

o  TE-CRG added cables for heaters for the RF cryomodules; the heat dissipation in the cores should be checked.
HL coordination will contact TE-CRG to technically assess the operation of the heaters and if there is a real problem.
EL will be requested to perform the analysis only of this is confirmed.

o New DIC from CRG shared for point 5 but the DIC for point 1 is not yet received and the announced EN-EL-CS dealine is set to mid september 2026.. EN-EL-CS is working on impact and implementation.

LSS5L received and integrated, no impact on the space occupation (impact on type and quantity of cables). LSS5R ongoing.
LSS1 other impacts as some cables are already installed, a “repairing” campaign could be required, an ECR could be necessary to track this additional slot in the planning.
Some other modifications and inconsistency of the DIC files have been identified, a meeting between EL and TE-CRG (Marco Pezzetti) will be organized.

Update received for the UR with mistakes, EL corrected what was possible and sent back a new version to be used for the next iterations. As this is a main concern, in case the next version will not be acceptable EL will include HL coordination team in the loop to escalate.

o   HL asks to get visibility on the cable availability Vs. the cabling campaigns, and to be notified with notice if some material is late. As the framework is complex (many stakeholders including manufacturers, CERN Store, EL logistic manager, EL cabling team) EL is working on a new application to improve the visibility on the procurement.

An app as been developped to follow the follow-up of cable availability and procurement. It is under evaluation between EN-EL and CERN store. Work in progress, the prpoject will have access to th edata soon (HL coordination and Hector)

o   CC35 (double shift) and CC45. Towards completion of the scope. Issue with TC3 cable to be reconsidered. Fixation of cables in ULs and UAs duly planned and will be done in the coming weeks.
Connections and tests delayed, anyway COMSA assigned new resources to progress.
Possibility to use the same teams of CC35 to do some decabling of UAs foreseen in 2027 (to be confirmed by HL coordination).
HL waiting for a report including the return of experience of the double shift (action: Diogo)
The report is published, EL and HL cooridnation to meet to discuss together the content and the outcomes.

o   Harting connectors found non conform (bad assembly). 
Correction done in P5; correction to be still completed in P1 duringthe cabling campaigns of 2027.

 

16:00 → 17:30 Supporting slides

Speakers: Davide Bozzini (CERN), Mario Parodi (CERN)

Meeting minutes of October