MBHSP02 Quench Protection Study

MBHSP02 QUENCH PROTECTION STUDY

April 16, 2013FERMILAB

MBHSP02 voltage tap locations

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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

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26 mm

21.5 mm

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

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Quench protection study: definitions

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Manual trip at different currents Dump delay 1000 ms Operation with one or two PH per coil

Current decay

HFU discharge

Quench protection study

Minimum required PH peak power density to quench the magnet

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50-55 W/cm2

PH delay in MBHSP01/02

50 W/cm2 peak power density in MBHSP02 and 25 W/cm2 in MBHSP01

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PH delay in the inner and outer coil layers

50 W/cm2 peak power density in MBHSP02

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Protection heater delay in the outer coil layer

Two PH (HFU1/2) vs. one PH (HFU2)

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Protection heater delay in the inner coil layer

Two PH (HFU1/2) vs. one PH (HFU2)

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Quench protection study

Quench propagation from OL to IL

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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

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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

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More PH delay study

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Backup Slides

Guram Chlachidze, CERN-Fermilab internal review 15

MBHSP01 vs. MBHSP02

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MBHSP02 Quench Training

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4.5 K 1.9 K 4.5 K