1. First LHC Splice Review Introduction
4/22/2018
First LHC Splice Review, CERN, October 18-22, 2010
First LHC Splice Review
Introduction
Francesco Bertinelli
The status of main splices
The Splices Task Force
The Review programme
20 minutes presentation, 10 minutes discussion: 12 slides

2. The start ... From L. Rossi, CERN Courier September 2010 4/22/2018
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

3. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
... then nQPS and measurements ...
IC splices
From A. Siemko
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

4. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
LHC main splices today: busbars SC
From Z. Charifoulline
301 ± 85pΩ
Rmax = 2.7nΩ
Rmax = 3.3nΩ
306** ± 313pΩ
(**) number of splices in the quads segments corrected, 1.3 added
Dipole Buses
Quad Buses
Main Dipoles&Quads Bus, sorted by position, 2048 segments
All HWC pyramids and plus ~150 ramps to 3.5TeV analyzed
Top 10 Splice Resistances
2nΩ
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

5. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
LHC main splices today: magnets SC
From Z. Charifoulline
Main Dipoles
3.1±1.2nΩ
8 splices
(but not all the same type)
Main Quads
1.4±1.3nΩ
3 + 2* splices
(* partially)
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

6. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
LHC main splices today: busbars NC
From M. Koratzinos
Measurements done at RT (and attempted at 80 K)
Non-invasive (“Biddle” measurements): accuracy 10 to 17 Ω (depending on the sector) for the RB, 26 to 36 Ω for the RQ, 5 sectors only
Invasive: (“R16” measurements): accuracy 1 Ω, but limited number and biased.
~15% limit 7 TeV operation (~0.5 to 2% limit 5 TeV operation)
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

7. Increased attention on all splices (singularities)
4/22/2018
Increased attention on all splices (singularities)
From R. Principe, A. Zaghloul, P. Fessia
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

8. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
The Splices Task Force
Mandate (November 2009): to review the status of all superconducting splices in the LHC machine and prepare the necessary consolidation actions for 7 TeV operation.
Initial time frame: 6-8 months starting November 2009, so that the shutdown could be adequately organized (→ 2012)
Members from different areas: F. Bertinelli, N. Catalan Lasheras, P. Fessia, C. Garion, S. Mathot, A. Perin, C. Scheuerlein, S. Sgobba, H. Ten Kate, J.P. Tock, A. Verweij, G. Willering
Work priorities:
Design of main 13 kA IC splice;
6 kA “praying hands”;
“other” splices
(follow Minutes and Shared Documents)
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

9. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
LHC Splices Review
Mandate: to review CERN’s plans and consolidation actions concerning the superconducting splices in the LHC machine for 7 TeV operation
Members: George Ganetis / BNL, Toru Ogitsu / KEK, Frederic Savary / ITER & CERN, Jim Strait / Fermilab (Chairperson), Pierre Vedrine / CEA Saclay, D. Bresson / Alstom
In Review 1 to assess:
the design for the consolidation of the main 13 kA interconnection splices
the plans for the work organization, quality control, resources, schedules
the status and risk analysis of all superconducting splices in LHC.
In Review 2 to assess:
the readiness for the shutdown intervention: specifications, procedures, quality control methodologies, qualifications, resources, schedule
In Review 3 to perform a Quality Audit to assess:
whether the status of LHC corresponds to what was expected
if implementation actions correspond to the plan
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

10. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
First LHC Splices Review programme
Presentations Monday and Tuesday morning: not intended to be exhaustive ...
Fact-finding by Reviewers, detailed work together: initiative taken by Reviewers
Videoconference between Reviewers Thursday afternoon?
Reviewers report and conclusions Friday
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

11. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
Specific questions for Reviewers
Consolidation of main IC splices:
Is the chosen solution conceptually sound?
Comment on the design of the consolidated main IC splice and the proposed process.
In the current preparatory stage for the consolidation shutdown, have all aspects been covered?
Comment on the proposed use of resources and planned schedule: realistic to ensure the objective of 100% quality?
Risk assessment of all SC splices:
Have all other SC splices been studied and assessed, do they present potential risk, have corrective actions been identified?
Have other risks associated to SC electrical circuits been assessed, do they present potential risk, have corrective actions been identified?
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli

12. First LHC Splice Review - Introduction - F. Bertinelli
4/22/2018
“Warnings”
Work-in-progress: we are not ready, but now is when your input/guidance can be most valuable
“repair” is never the same as “new”
quantities are large (10 times ...)
and of course space is limited (e.g. existing spools)
some thought also to time and resources ...
the study of “splices” extends to “circuits”
Have a good week: I hope it is both fruitful and enjoyable
18 October, 2010
First LHC Splice Review - Introduction - F. Bertinelli