conclusions of the follow up review of lhc cryomagnet tests 16 december 2003 n.
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DRAFT. Conclusions of the follow-up review of LHC cryomagnet tests 16 December 2003. Ph. Lebrun. Background.

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background
Background
  • In spite of remarkable progress achieved in 2003, reception tests of LHC cryomagnets remain a critical issue, with the long-sought development of series magnet production rates in industry
  • The criticality of this issue was foreseen in 2002, due to well identified structural and circumstantial causes; we therefore decided to follow it closely, through an array of actions, among which periodic reviews
    • review of reception tests of LHC cryomagnets of 23 July 2003
    • this review of 16 December 2003
  • Although it provided comprehensive data on test operation and results obtained in the second half of 2003, the December 2003 review proved unconclusive
    • insufficiently processed or inhomogeneous data
    • intense discussions which the agenda could not accommodate
  • An ad hoc meeting of the Group Leaders concerned was called on 9 January 2004, to provide decisive answers to a list of questions raised by the review

Follow-up review of LHC cryomagnet tests 16 Dec 2003

aims of the review
Aims of the review
  • Analyse the results obtained and the experience gained in the second half of 2003, with reference to the findings and recommendations of the July 2003 review
  • Identify and correct remaining difficulties
    • review capacity limits of test infrastructure and equipment
    • review contents, constraints and resource requirements of the test programs, with the aim of further streamlining
    • review organization of work
  • Agree on updated test plan for 2004 and later
  • Involve all concerned parties

Follow-up review of LHC cryomagnet tests 16 Dec 2003

participants
Participants

Follow-up review of LHC cryomagnet tests 16 Dec 2003

programme
Programme

Follow-up review of LHC cryomagnet tests 16 Dec 2003

conclusions 1 5
Conclusions [1/5]
  • Significant progress achieved, with 90 magnets tested in 2003, however insufficient, as backlog of untested magnets built up to 85 by the end of the year

Follow-up review of LHC cryomagnet tests 16 Dec 2003

conclusions 2 5
Conclusions [2/5]
  • Bench occupancy still a factor of ~2 above expected, with delays on all phases of sequence
    • connection & removal: 24 h planned, 30 h observed average + 33 h waiting time!
  • intervention by ICS for magnet connection/removal on weekends (A. Poncet)
    • pumpdown: 12 h planned, 13 h
  • explore possibility of shortening pumpdown (L. Tavian)
    • leak search: planned during pumping, + 15 h observed avg
  • define and enforce leak-testing procedure by ALLS (L. Tavian)
    • cooldown: 24 h planned, 46 h observed avg
    • warmup: 12 h planned, 32 h observed avg
  • increase cooldown/warmup flow-rate (higher Psuction, 3rd circulator) (L.Tavian)
    • cold tests: 36 h slot, 72 h observed avg due to
      • more than 2 hi-field quenches & thermal cycle
      • sequencing between benches
      • insufficient coordination between teams
  • review conditions of “cryo O.K.” flag (L. Tavian)
  • implement Test Tracking System for uniform & up-to-date information of teams involved (L. Tavian)

Follow-up review of LHC cryomagnet tests 16 Dec 2003

slide8

L. Walckiers

Follow-up review of LHC cryomagnet tests 16 Dec 2003

conclusions 3 5
Conclusions [3/5]
  • Power tests
    • large incidence of hi-field quenches & thermal cycles on test programme
    • overall cryogenic capacity of test station sets limit to number of quenches (6 hi-field quenches + 2-3 magnet subcoolings per day)
    • 2 hi-field quenches are sufficient to assess electrical integrity of magnet
    • no strong technical case to measure retraining, hence no use of thermal cycle on series magnets
  • revised procedure & flow chart for power tests (Action L. Rossi)
  • Magnetic measurements
    • adequate cold/warm correlations for multipoles
    • importance of field integral and field angle measurements
    • good correlation between apertures
  • implement field integral & angle measurement in one aperture, consider replacement of long shaft by stretched wire for series (Action L. Walckiers)

Follow-up review of LHC cryomagnet tests 16 Dec 2003

reduced training program proposal

MBOK

MBOK

MBOK

Quench ?

Quench ?

Reduced Training Program (proposal)

Shoot to 9 T

n

Provoke 1 Q

@ 8.33 T

n

Verify 8.4 T

Quench ?

y

y

Shoot to 9 T

n

n

y

Q < ?

8.4 T

Verify 8.4 T

Quench ?

y

y

n

  • Contractual Acceptance
  • MB should reach 9 T after 8 quenches
  • If more than 5 quenches to reach 9 T
    • Thermal cycle performed
    • MB should reach 8.6 T at 1st quench

Follow-up review of LHC cryomagnet tests 16 Dec 2003

slide11

Reduce Magnetic Measurement : Strategy

Field Quality cold measurement on

50 MB : extended measurements

+ 150 MB : Bdl& multipole (static & dynamic)

+ 200 MB : W/C correlation (static)

Measure b1, a1 with SSW during cold tests

a1 with SSW in SMI2 : ready

a1 with mole in SMA18 : 2 to 3 MB/week

a1 with DIMM in Industry : mid-Febr.

L. Walckiers

Follow-up review of LHC cryomagnet tests 16 Dec 2003

conclusions 4 5
Conclusions [4/5]
  • Management & organization
  • reaffirm executive responsibilities of hierarchical line
    • MTM group leader
    • Test Operation section leader
    • Shift leader
  • reinforce leverage of Test Operation section leader on services
    • equipment support teams in MTM & other groups
    • industrial support
  • reaffirm consultative scientific role of test coordinators
  • provide adequate training to operators, shift leaders, test coordinators
  • improve representation in and functioning of Test Operation weekly meeting
  • develop & implement test assessment and follow-up tools

(Actions L. Walckiers)

Follow-up review of LHC cryomagnet tests 16 Dec 2003

conclusions 5 5
Conclusions [5/5]
  • Completion of the test station & future tests
    • Restart operation in January 2004 with 8 benches operational
    • Availability of remaining benches
      • B2 1 March 2004
      • B1 15 March 2004
      • A2 15 April 2004
      • A1 22 April 2004
    • Allocation of 2 benches to SSS series tests (D1 & D2)
  • 160 dipoles & 55 SSS tested by mid-2004
  • 2 magnets/day from mid-2004 onwards
  • Catching up with the backlog
    • mostly composed of cross-section 2 dipoles
  • allocate 4 benches to tests of backlog magnets, out of which 2 configured for tests without anticryostats
  • only perform magnetic measurements on cross-section 3 dipoles
  • establish detailed test programme of backlog magnets (Action L. Rossi)

Follow-up review of LHC cryomagnet tests 16 Dec 2003

slide14

L. Walckiers

Follow-up review of LHC cryomagnet tests 16 Dec 2003