1 / 31

Testing of LHC Magnets in Cryogenic Conditions: Operational Challenges, Status & Outlook

Testing of LHC Magnets in Cryogenic Conditions: Operational Challenges, Status & Outlook. V. Chohan SM18 Operation CERN. Talk Outline. The Environment Operational Challenges Throughput Strategies Accomplishments Outlook Conclusion. The Environment.

shayla
Download Presentation

Testing of LHC Magnets in Cryogenic Conditions: Operational Challenges, Status & Outlook

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Testing of LHC Magnets in Cryogenic Conditions: Operational Challenges, Status & Outlook V. Chohan SM18 Operation CERN

  2. Talk Outline • The Environment • Operational Challenges • Throughput Strategies • Accomplishments • Outlook • Conclusion Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  3. The Environment

  4. Work Environment: Operational Challenges • Resources • 12 Test Benches arranged in pairs so, 6 clusters( A to F) • Water for 4 magnet powering at the same time, • Cryogenics capacity and limits have improved in 2005, but still it has its constraints in warming, cooling and the number of quenches permitted in real time, • Operation staff consists of 7 CERN staff (up to end 2004) on loan from CERN Accelerator Operation & 15-20 persons on exact 1 year contracts from India & constantly rotating. • All these conditions pose formidable challenges to set up and run operation Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  5. Throughput Strategies • To Achieve the project objectives it was necessary to : • Plan and schedule tests • A “To Do List” was formulated which enumerated the minimum tests to be conducted in the magnet • Collate results & Tests summaries and Track the progress of tests • A web based tool SM 18 Tests Management Scheme (SMTMS) was developed Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  6. Throughput Strategies • Develop tools to aid the operation Team • Integrated resource monitoring displays were generated • Electronic Traveller was developed (All actors) Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  7. Accomplishments

  8. Results till end-April 2005 Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  9. Cumulative Total: All Magnets (includingRepeats & Rejects) Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  10. Outlook

  11. Countdown LHC : Simple Magnets Count Basis • In 2004 we achieved a magnet tests rate of ~ 55 Magnets • We need to go up to ~ 69 magnets per month to complete the magnet tests byNovember 06 • This figure assumes ~ 1900 magnets tests i.e, ( 1706 + ~ 11 %) where11 %is the number ofretests. 2004 Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  12. Countdown LHC : Simple Magnets Count Basis • To achieve the targetof 69 magnet tests per month, a course of action is underway since Feb 2005. • Results from early 2005 shows a positive trend. Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  13. Conclusions Despite, • CERN’s financial constraints in 2000 and change in strategy, • late delivery of tests benches and related equipment, and • certain under capacity in cryogenics till last year, the magnet testing programme is now fully on schedule to meet the project deadlines. Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  14. Extra Slides Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  15. Magnet Statistics until April 05 Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  16. How do we accelerate the testing of magnets ? Our most precious resource is the bench occupancy time hence, one must “Reduce the bench occupancy time” • The bench occupancy time consists of • Connect Time : Connection of Magnet to the CFB • Cooling Time : Cooling the Magnet to 1.9 K • Cold Test Time : Training the Magnet + Special Measurements • Warming Time : Warming the Magnet to 300 K • Disconnect Time : Disconnection of Magnet from the CFB (For a Dipole, this total should be theoretically 108 hrs.of which cold test time is 36 hrs. ) • To reduce the bench occupancy time,any OR all these times must be reduced Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  17. Bench Occupancy Reduction Schemes • Enhanced Cryo-Capacity in 2005 & resulting optimism • Moderate Proposals(Presented at MTM Review Jan 05) • Fewer Single Stretch Wire Measurements for Arc-SSS magnets • Reduced Training Quenches beyond 7 TeV: 3 Quench Rule • Improved Production Control at warm : Diode Tests • Reduced duplication : WP04 Insulation Tests • Additional [Radical] Proposals that could still be done • Schemes that curtail training to currents upto 11 kA (~ 6.5 TeV operation) ; implies ‘training’ in the tunnel to go up in Energy • Reduce “ Connect Time” by not doing certain tests at warm on the bench Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  18. Cryo-Capacity 2004 & Estimates 2005 • The Average Wait+Coolingtime was 45 hours & Wait+Warmingtime was 20 hours • We are told to expect a gain of 50 % in CWS unit of cryogenics in 2005. so at least 1 more magnet in 300K-90K or 30K-300K phase • Wepredicta Wait+Cooling time of ~ 30 hours & Wait+Warming time of ~15 hours Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  19. Cryo-Capacity so far in 2005… • In 2004 The Avrg Wait+Cooling was 45 hours & Wait+Warmingtime was 20 hours • We were told to expect a gain of 50 % in CWS unit of cryogenics in 2005. so at least 1 more magnet in 300K-90K or 30K-300K phase • Wepredicta Wait+Cooling time of ~ 30 hours & Wait+Warming time of ~15 hours Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  20. SUMMARY: Time Saving Schemes • Based on Moderate Proposals & Cryo improvements Cold Test times include Magnetic Measurements (Special & Non special) Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  21. Projections: Accelerated Rate for Dipoles & ARC SSS & Optimistic Rate for IR SSS Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  22. Assumptions • All the moderate proposals mentioned would be implemented • It is assumed that a figure of 1869 magnets will have to be tested including retests. Retest rates: 11% dipoles, 6% Arc SSS, 6%IR SSS • It assumed that the magnets will be available for testing as and when desired Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  23. Projections: Accelerated Rate for Dipoles & ARC SSS & Optimistic Rate for IR SSS • Highlights: • Testing Time for Dipolesis ~113 hrs • Testing Time for ArcSSSis ~ 137 hrs • Testing Time for IR- SSS ~ 168 hrs? • Completion of testing of all MAGNETS • Dec 06 • Assumption: • We can attain a figure of up to 69magnets per month Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  24. Projections: With ~ 62 to 65 Magnets per month Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  25. Projections: With ~ 62 to 65 Magnets per month • Highlights: • Testing Time for Dipolesis ~116 hrs • Testing Time for ArcSSSis ~ 170 hrs • Testing Time for IR- SSS ~ 240 hrs ? • Completion of testing of all MAGNETS • March 07 • Assumption: • We can attain a figure of up to 65magnets per month Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  26. Ramp 1 [To 12850A] Rules : 15 April 04 Quench? magnet trained! Yes Iq>12kA No Generate .u file at 12850A & SPA Yes Iq<12kA MM*, PT8, CDAP Ramp 2 [To 12850A] Min. NRJ at 11.85 kA Yes Iq>12kA Quench? Ramp 2 [To 12850A] No MM*,CDAP Yes Iq<12kA Quench? Generate .u file at 12850A & SPA Train to 12850A (see rules) # 8 ramps Yes Yes If shafts? No No No PT8 Yes MM*, PT8, CDAP Ramp 9 [To 12850A] Min. NRJ at 11.85 kA Yes Quench? CDAP CDAP at 4K No Generate .u file at 12850A & SPA Generate .u file at 12850A & SPA Warm-up on 10th Quench at 4K (SSL) MM*,CDAP MM*,CDAP Min. NRJ at 11.85 kA Min. NRJ at 11.85 kA Warm-Up

  27. MM* If Shafts Are Present! PT8 = Ramp to 12 kA & SPA CDAP =HV@ cold Final Min NRJ = Quench provoked FPA Disabled • # Max 9 Ramps to 12850A; If this terminated in <= 9 ramps • Then follow flowchart , else: • magnet is poor & do warmup on 10th with 4K quench • Instead of PT10 • THEN: Thermal Cycle if AntiC exist & so put in shafts • ELSE(( if no AntiC) – Magnet removed & Standby Thermal Cycle Rules with Shafts Inserted : In the 2nd Run: if 1st Q above (8.4 T) 12000A then MB accepted if 2st Q above (8.6 T) 12350A then MB accepted ELSE MAGNET REJECTED WITH poor perf non-conformity but with the rules : if Quenches are localised only in 2nd run (with shafts inserted only in the 2nd run ): perform 5 quenches only And END the Tests . if Quenches were localised in first RUN : then perform max 2 localized quenches only in 2nd run Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  28. Additional Tools • To improve operational efficiency and smoothen work flow, operational tools were designed and implemented. • Many innovative ideas and proposals emerged with discussion held with operation group. • Some tools were developed by ingenious personnel of SM 18 operation team. • SM 18 Test Master System, • E-Traveller, • Integrated Resource Display. Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  29. Additional Tools: SMTMS • Description • The SM 18 tests management system (SMTMS) was developed which uses the CERN backbone in web based services and features of Access data base. • Uses • Automatic generation of Tests sequence and reports, hence reduced the ‘bureaucratic’ activity of typing 11 reports after the tests were conducted on a magnet • Track the progress & Statistical data of tests were important spin-offs of this tool. Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  30. Additional Tools: E-traveller • Requirement • With 12 benches in operation, the tests scenario in SM 18 is very dynamic. • Description • The E-traveller is a software toolinterfaced to mobile phones that alert the various teams of their need on a particular magnet. • Advantages • Time to locate members of other teams is reduced. • Reduced verbal communications between teams (Indian personnel have limited knowledge of French ). Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

  31. Power Cryo Water Additional Tools : Integrated Resource Display • Requirement • Resources such as Cryo Capacity,power, water are limited. The electronics too is common between benches in a cluster • The operation team has to juggle with the resources to carry out tests. • Description This integrated resource display was generated by interacting with software programmes controlling the resources and running under various operating systems. • Utility This enable the operations crew to optimise resources usage and prevent resource conflicts from arising. Particle Accelerator Conference, 16-20 May 2005, Knoxville, Tennessee, USA.

More Related