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LQ Conceptual Design and Analysis Giorgio Ambrosio

BNL - FNAL - LBNL - SLAC. LQ Conceptual Design and Analysis Giorgio Ambrosio. 7 th LARP Collaboration Meeting Oct. 25-27, 2006. OUTLINE: Goals, sub-tasks, milestones, Status Plans. LQ Design Study Goal. GOAL: Perform studies for the design of the LARP Long Quadrupole

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LQ Conceptual Design and Analysis Giorgio Ambrosio

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  1. BNL - FNAL - LBNL - SLAC LQ Conceptual Design and AnalysisGiorgio Ambrosio 7th LARP Collaboration Meeting Oct. 25-27, 2006 OUTLINE: • Goals, sub-tasks, milestones, • Status • Plans LQ DS status and plans – G. Ambrosio

  2. LQ Design Study Goal GOAL: Perform studies for the design of the LARP Long Quadrupole • 4 m long, 90 mm aperture, G > 200 T/m, TQs’ design is the baseline • Can the LQ use the TQ coil cross-section? (i.e. same cable, same insulation, same turn position) • And the same coil fabrication technology? (binder curing, heat treatment, impregnation …) • What’s the best support structure? • Taking into account TQ, LR, LM, performance & analysis LQ DS status and plans – G. Ambrosio

  3. Sub tasks • Strand and cable optimization • Define strand and cable characteristics • Coil fabrication technology • Define/check steps of coil fabrication (procedures and materials) • Magnetic design • Develop modifications to TQ magnetic design, if necessary • Quench protection • Propose quench protection scheme • Mechanical design analysis • Study length related issues • Develop and compare supporting structures for LQ mechanical design LQ DS status and plans – G. Ambrosio

  4. The path to the LQ Technological Quadrupoles Long Quad. Design Study Long Racetrack Long mirror Long Quadrupole LQ DS status and plans – G. Ambrosio

  5. Status At the end of FY06 Sub task by sub task … LQ DS status and plans – G. Ambrosio

  6. LRS01 Design Report CONTENTS 1. INTRODUCTION 2. CONDUCTOR CHARACTERISTICS 3. MAGNETIC DESIGN 4. COIL FEATURES AND FABRICATION 5. MECHANICAL DESIGN 6. MAGNET ASSEMBLY 7. QUENCH PROTECTION 8. COIL INSTRUMENTATION COMPLETED LQ DS status and plans – G. Ambrosio

  7. Conductor • Cable parameter and HT optimization • New spec for cable width? • Heat treatment (RRR and Ic)? • Possible strand designs with higher copper-to-non-copper ratio • in order to know all possible options for the Long Quadrupole • There is a billet available: • Strand in January, results in April, in time for LQ strand spec. LQ DS status and plans – G. Ambrosio

  8. Parameter Unit ~TQC Thick Ins N of layers - 2 2 N of turns - 136 116 Coil area (Cu + nonCu) cm2 29.33 25.01 Assumed non-Cu Jc at 12 T, 4.2 K A/mm2 2400 2400 4.2 K temperature - 6% + 11% Quench gradient T/m 223.5 209.3 Quench current kA 13.47 14.94 Peak field in the coil at quench T 11.6 11 1.9 K temperature Quench gradient T/m 240.6 226.1 Quench current kA 14.57 16.23 Peak field in the coil at quench T 12.5 11.9 Magnetic design w thick ins. • A 2D magnetic design was developed with a thick cable insulation (250 mm) • as close as possible to the present TQ design. LQ DS status and plans – G. Ambrosio

  9. Coil fabrication technology • We are exploring the option of braiding the insulation on the cable • Same small thickness as sleeve, and much easier application to long cable units • Spec completed, request sent out • We tested the electrical strength of TQ practice coils (TQS and TQC) • Turn-to-turn Voltage Breakdown > 700 V at 190 MPa • TQC practice coils had been used in several mechanical models • Report is available on LARP web site The TQ insulation is OK for the LQ! LQ DS status and plans – G. Ambrosio

  10. Coil fabrication technology • CTD has developed a new ceramic binder that should replace the present ceramic binder • significantly lower cost and also shorter procurement time • Qualification tests in progress • TQC01 has several “bubbles” on the inner layer • D20 and other LBNL magnets tested at 2K didn’t show the same problem • Will examine TQS01b after test at 2K  address fabrication issue or develop different scheme for Protection Heaters on the inner layer LQ DS status and plans – G. Ambrosio

  11. LQ Quench protection • QuenchPro Input • Conductor parameters TQ cable (Jc 2400 A/mm2) • Magnet parameters (@ 4.2K) G = 223 T/m • Code and input validation • Geometry & inductance (Opera/ROXIE/TQC01) Done • Material properties & MIITs (QLASA/TQC01) Low G10-Cp • Quench protection parameters • Detection time: 5 and 10 ms in progress • Heater delay time: 25 ms can be shorter • Preliminary results Presented at ASC • Comparison with TQC/S01 data in progress LQ DS status and plans – G. Ambrosio

  12. First results presented at ASC at dI/dt max at I max LQ DS status and plans – G. Ambrosio

  13. ~23% ssl ~62% ssl msec TQC01 protection heater studies by using spot heaters to initiate the quench. TQs heater-delay & detection time • Heater delay time can be << 25 ms at I = 62% Issl • Detection time 4.0 ms at 87% Issl • “anomalously-quick quench-onsets” TQC01 TQS01 Outer-layer P-heater-quenching was detected only during Q01 (0.81*Iss):  21-26 ms after detection • TQC/S01 insulation between strip heater and SC cable: • 5 mil glass-fiber sleeve • 2 mil kapton (trace) LQ DS status and plans – G. Ambrosio

  14. Temperature vs. Quench Integral • During TQC01 test we were able to make one QI vs. T measurement I [A] QI [MIIts] peak Temp [K] 5000 9.05 340K • Good agreement with simulation using low Cp of G10 QI [MIIts] peak Temp [K] High G10_Cp 10.5 340K Low G10_Cp 8.73 340K Low G10_Cp 9.05 360K (+6%) LQ DS status and plans – G. Ambrosio

  15. Simulations with low G10_Cp at dI/dt max at I max All cases with 60 mW dump resistance, and Cu/non_Cu = 0.89 † could have 75% coverage with 3 out of 4 circuits LQ DS status and plans – G. Ambrosio

  16. Conclusion • LQ quench protection with “TQ-like” coils looks challenging but doable We have to: • establish quench detection time vs. I/Iss • measure heater-to-coil voltage breakdown in TQ coils In order to know how much we can push to have short heater delay time • solve the issue about inner layer heaters • complete tuning of simulation with TQ quenches • If we are open to a possible higher Cu/nonCu ratio (1.1-1.2)  then we can say LQ x-section = TQ x-section LQ DS status and plans – G. Ambrosio

  17. Plans • Complete Quench Protection study  define LQ coil X-section • By end of Nov. (with sufficient input from TQS01b) • Complete Coil Fabrication Technology study • By end of Q1 (braided insulation may take longer) • Feedback from LR and LM … • Mechanical Design analysis and development • See following LQ DS status and plans – G. Ambrosio

  18. Mech Design Analysis & Development • The development of the mechanical design for the LARP Long Quadrupole is based on the TQs, the Long Racetrack, the Long Mirror, and the analyses performed for the LQ design study • Each TQ team will develop the best proposal for the LQ based on its expertise (i.e. TQS ==> LQS, and TQC ==> LQC) but also based on all TQs, LRs and LMs performance and analysis LQ DS status and plans – G. Ambrosio

  19. Mech Design Analysis & Development • Monthly Working Group meetings • 1st workshop at the end of February • Goal: discuss 1st version of both designs • Feedback from TQS01b, TQC01b and/or TQC02, the 77K test of the LR support structure, and the 2m LM • 2nd workshop in July • coordinated with the TQ2 evaluation review • Goal: finalize designs and analysis for MT and review • Feedback from LRS01, and the 4m LM • External review September 07 • LQC and LQS Mech. Design Report ready for review LQ DS status and plans – G. Ambrosio

  20. Is the plan OK? • Questions? • Comments? LQ DS status and plans – G. Ambrosio

  21. Milestones • FY2007 Plan: • Development of LQ coil fabrication technology based on TQ, LM and LRS01 coil fabrication and performance (Q1) • Selection of LQ mechanical structure based on TQ series and LRS01 performance and analysis (Q2-Q4) • Develop technical proposal for LQ R&D including model design parameters and baseline technology • draft technical proposals for FY2008 at LARP collaboration meeting (Q2) • final proposals for FY2008 (Q4) LQ DS status and plans – G. Ambrosio

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