1. Impact of Cu/NonCu on Quench Protection 1 Impact of Cu/NonCu on MQXF Quench Protection G. Ambrosio, V. Marinozzi, E. Todesco Conductor Video Mtg. April 20, 2015

2. Impact of Cu/NonCu on Quench Protection 2 Code and Parameters QLASA simulations by V. Marinozzi MATPRO material properties Methods and Material Properties validated by comparison with LQ and HQ test data PROTECTION PARAMETERS Current (kA)16.5 / 17.5 /18.5 /20 /22 Lenght (m)16.8 Dump resistor (mΩ)48.6 / 45.5 / 43.2 / 40.0 / 36.0 Voltage threshold (V)0.1 Validation Time (ms)10 HF-IL PH delay time (ms)18 / 15.5 / 13 / 7.5 / 5 LF-IL PH delay time (ms)18.5 / 16 / 13.5 / 8 / 5.5 HF-OL PH delay time (ms)19.5 / 18 / 16.5 / 13 / 11.5 LF-OL PH delay time (ms)23 / 22.5 / 21 / 18 / 16.5 Dynamic effects on inductanceno Q1 and Q3 in series Conservative assumption

3. Impact of Cu/NonCu on Quench Protection 3 Hot Spot Temp. vs Cu/NonCu

4. Impact of Cu/NonCu on Quench Protection 4 Extreme Case After 16 independent heater circuits are lost

5. Impact of Cu/NonCu on Quench Protection 5 Test of Q2 at I > 16.5 kA PROTECTION PARAMETERS Current (kA)18.5 /20 Lenght (m)7.15 Dump resistor (mΩ)50 Voltage threshold (V)0.1 Validation Time (ms)10 HF-IL PH delay time (ms) - pessimistic 12 / 8.5 LF-IL PH delay time (ms) - pessimistic 13 / 9.5 HF-OL PH delay time (ms) - pessimistic 16.5 / 14 LF-OL PH delay time (ms) - pessimistic 21 / 18.5 HF-IL PH delay time (ms) - optimistic 7 / 4.5 LF-IL PH delay time (ms) - optimistic 7.5 / 5.5 HF-OL PH delay time (ms) - optimistic 10.5 / 9 LF-OL PH delay time (ms) - optimistic 14 / 12.5 Dynamic effects on inductanceyes Three heaters have been deactivated in one coil Validation + switch at VMTF: 1 ms

6. Impact of Cu/NonCu on Quench Protection 6 Test of Q2 at I > 16.5 kA

7. Impact of Cu/NonCu on Quench Protection 7 Test of Q2 at I > 16.5 kA at Test Facility PROTECTION PARAMETERS Current (kA)18.5 /20 Lenght (m)7.15 Dump resistor (mΩ)50 Voltage threshold (V)0.1 Validation Time (ms)2 HF-IL PH delay time (ms) - pessimistic 12 / 8.5 LF-IL PH delay time (ms) - pessimistic 13 / 9.5 HF-OL PH delay time (ms) - pessimistic 16.5 / 14 LF-OL PH delay time (ms) - pessimistic 21 / 18.5 HF-IL PH delay time (ms) - optimistic 7 / 4.5 LF-IL PH delay time (ms) - optimistic 7.5 / 5.5 HF-OL PH delay time (ms) - optimistic 10.5 / 9 LF-OL PH delay time (ms) - optimistic 14 / 12.5 Dynamic effects on inductanceyes Validation time for test facility: 2 ms Note: not possible in the LHC tunnel Validation time for test facility: 2 ms Note: not possible in the LHC tunnel Three heaters have been deactivated in one coil

8. Impact of Cu/NonCu on Quench Protection 8 Validation time for test facility: 2 ms Note: not possible in the LHC tunnel Validation time for test facility: 2 ms Note: not possible in the LHC tunnel

9. Impact of Cu/NonCu on Quench Protection 9 LARP Magnets