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MBHSP02 Quench Protection Study

MBHSP02 Quench Protection Study. April 16, 2013 FERMILAB. MBHSP02 voltage tap locations. MBHSP02 instrumentation. 2 protection heaters on the outer coil surface ~ 1100 mm long, 0.025 mm thick ( 21.5 mm wide in the mid-plane and 26 mm – in the pole area) stainless steel strips

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MBHSP02 Quench Protection Study

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  1. MBHSP02 Quench Protection Study April 16, 2013 FERMILAB

  2. MBHSP02 voltage tap locations

  3. MBHSP02 instrumentation • 2 protection heaters on the outer coil surface • ~1100 mm long, 0.025 mm thick (21.5 mm wide in the mid-plane and 26 mm – in the pole area) stainless steel strips • Heater to coil insulation consists of one layer of Kapton (114 µm) plus ~250 µm of glass 26 mm 21.5 mm

  4. PH in MBHSP02 • 2 protection heaters on the same coil side connected in parallel to the same Heater Firing Unit (HFU) • HFU voltage of 400 V provides ~ 65 W/cm2 peak power density in MBHSP02 heaters

  5. Quench protection study: definitions • Manual trip at different currents • Dumpdelay 1000 ms • Operation with one or two PH per coil Current decay HFU discharge

  6. Quench protection study • Minimum required PH peak power density to quench the magnet 50-55 W/cm2

  7. PH delay in MBHSP01/02 • 50 W/cm2peak power density in MBHSP02 and 25 W/cm2 in MBHSP01

  8. PH delay in the inner and outer coil layers • 50 W/cm2 peak power density in MBHSP02

  9. Protection heater delay in the outer coil layer • Two PH (HFU1/2) vs. one PH (HFU2)

  10. Protection heater delay in the inner coil layer • Two PH (HFU1/2) vs. one PH (HFU2)

  11. Quench protection study • Quench propagation from OL to IL

  12. Quench integral study: One PH only • Peak power density in PH was 50 W/cm2 at 4.5 K and 55 W/cm2 at 1.9 K

  13. Quench integral study: two PH • Peak power density in PH was 50 W/cm2 at 4.5 K and 55 W/cm2 at 1.9 K

  14. More PH delay study

  15. Guram Chlachidze, CERN-Fermilab internal review Backup Slides

  16. MBHSP01 vs. MBHSP02

  17. MBHSP02 Quench Training 4.5 K 1.9 K 4.5 K

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