Conclusions of the follow up review of lhc cryomagnet tests 16 december 2003
Download
1 / 14

Conclusions of the follow-up review of LHC cryomagnet tests 16 December 2003 - PowerPoint PPT Presentation


  • 54 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Conclusions of the follow-up review of LHC cryomagnet tests 16 December 2003' - hinto


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Conclusions of the follow up review of lhc cryomagnet tests 16 december 2003

DRAFT

Conclusions of the follow-up review of LHC cryomagnet tests16 December 2003

Ph. Lebrun


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


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


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


L. Walckiers

Follow-up review of LHC cryomagnet tests 16 Dec 2003


ad