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