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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
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 PARAMETERSCurrent (kA) 16.5 / 17.5 /18.5 /20 /22
Lenght (m) 16.8Dump resistor (mΩ) 48.6 / 45.5 / 43.2 / 40.0 / 36.0
Voltage threshold (V) 0.1Validation Time (ms) 10
HF-IL PH delay time (ms) 18 / 15.5 / 13 / 7.5 / 5LF-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 / 11.5LF-OL PH delay time (ms) 23 / 22.5 / 21 / 18 / 16.5
Dynamic effects on inductance no
Q1 and Q3 in series
Conservative assumption
Impact of Cu/NonCu on Quench Protection 3
Hot Spot Temp. vs Cu/NonCu
0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2260270280290300310320330340350360
MQXF Hot Spot Temperature16.5 kA17.5 kA18.5 kA
Cu/NCu
Tem
pera
ture
[K]
Impact of Cu/NonCu on Quench Protection 4
Extreme Case
After 16 independent heater circuits are lost
Impact of Cu/NonCu on Quench Protection 5
Test of Q2 at I > 16.5 kA
PROTECTION PARAMETERSCurrent (kA) 18.5 /20
Lenght (m) 7.15Dump resistor (mΩ) 50
Voltage threshold (V) 0.1Validation 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 / 14LF-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 / 9LF-OL PH delay time (ms) - optimistic 14 / 12.5
Dynamic effects on inductance yes
Three heaters have been deactivated in one coil
Validation + switch at VMTF: 1 ms
Impact of Cu/NonCu on Quench Protection 6
Test of Q2 at I > 16.5 kA
Impact of Cu/NonCu on Quench Protection 7
Test of Q2 at I > 16.5 kAat Test Facility
PROTECTION PARAMETERSCurrent (kA) 18.5 /20
Lenght (m) 7.15Dump resistor (mΩ) 50
Voltage threshold (V) 0.1Validation 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 / 14LF-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 / 9LF-OL PH delay time (ms) - optimistic 14 / 12.5
Dynamic effects on inductance yes
Validation time for test facility: 2 msNote: not possible in the LHC tunnel
Three heaters have been deactivated in one coil
Impact of Cu/NonCu on Quench Protection 8
Validation time for test facility: 2 msNote: not possible in the LHC tunnel
Impact of Cu/NonCu on Quench Protection 9
LARP Magnets
