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BNL - FNAL - LBNL - SLAC

BNL - FNAL - LBNL - SLAC. Long Quadrupole Quench Protection G. Ambrosio, G. Chlachidze, C. Donnelly S. Rahimzadeh-Kalaleh. Measurement & Analysis Group Meeting July. 20, 2007. OUTLINE: LQ Quench protection Spikes recorded during TQS02 test. Magnet parameters.

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BNL - FNAL - LBNL - SLAC

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  1. BNL - FNAL - LBNL - SLAC Long Quadrupole Quench Protection G. Ambrosio, G. Chlachidze, C. Donnelly S. Rahimzadeh-Kalaleh Measurement & Analysis Group Meeting July. 20, 2007 OUTLINE: • LQ Quench protection • Spikes recorded during TQS02 test LQ Quench Protection – G. Ambrosio

  2. Magnet parameters LQ Quench Protection – G. Ambrosio

  3. TQC01 protection heater studies by using spot heaters to initiate the quench. TQs Heater Delay & Detection Time • Heater delay time: t ~ 10 ms close to quench plateau;t < 15 ms at I = 62% Issl • Detection time: 3 - 11 ms during TQS01c training • Flux jumps up to 600 mV with MJR cable TQC01 msec TQS01c LQ Quench Protection – G. Ambrosio

  4. MIITs Limit • During TQC01 test, one QI vs. T measurement I: 5000 A , QI: 9.05 MIITs, Peak Temp: 340 K • Impact on quench performance of high-MIITs quenches (TQS01c) • + 4% after 8 MIITs • - 2.9% after 8.1 MIITs • - 7.4% after 8.7 MIITs • - 18.4 after 9.5 MIITs • Small bumps at 7.5 MIITs LQ Quench Protection – G. Ambrosio

  5. MIITs and Voltage at quench current Dump = 60 mWDetection time = 5 ms Heater delay time = 12 ms High MIITs at 1.9K Voltages OK LQ Quench Protection – G. Ambrosio

  6. Needs for LQ QP • Four independent circuits for protection heaters • Change dump resistance at 1.9K? • Easily changeable detection threshold • Develop smart quench detection to avoid spikes with low threshold? • Time • Voltage slope • Spike recognition • Current depending threshold • … LQ Quench Protection – G. Ambrosio

  7. Spikes in TQS02 LQ Quench Protection – G. Ambrosio

  8. 4.5 – 1.9 K LQ Quench Protection – G. Ambrosio

  9. Threshold profile LQ Quench Protection – G. Ambrosio

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