1. MQY as Q5 in the HL LHC era
Glyn Kirby
MQY 001 bat 927

2. Overview MQY parameter list Proposed change to LHC circuit
High Energy in test station comparison
Test station modification
PSU’s set up, current leads 3 or 4, protection.
Test plan
Typical out of balance powering

3. MQY parameters Operating Temp 4.5 K 1.9 K Nom Gradient 160 T/m 200 T/m
Nom Current A A
Inductance 74 mH/aperture
Twin aperture clear 70mm diameter
Overall length 3.64 m
Mass 4.3 tones

6. Proposed change to LHC circuit and operation

7. Comparing Quench Energy’s
MQXC KA, 688 kJ
HQ KA, kJ
MQY 4.5 K , kA, 482 kJ/ap kJ T/m
MQY 1.9 K , ultime performance 110% of nominal gradient, 5.0 kA and 220 T/m, kJ /Ap kJ

8. Operating Area 5000 A, 5000A 2000 kJ 1.9K 958 kJ 4.5K 4500 A, 2250 A
936 kJ 50% diff
HQ 750 kJ
934 kJ
90 % diff field measurement ?
3600 A
5030 A

9. HQ test

10. Standard Circuit in LHC
Std PSU in LHC is limited to I2=50% I1

11. SM18 Test set up ? Ideal set up 4 current leads Two dumps Two switches
QPS set up ?
PSU A
PSU A
Or use quench heaters to protect magnet

12. Test cycles 50% A1/A2 MAX A1-A2 90% A1/A2
Example of the type of cycle we will need.
Slow ramp rates 3.8 A/s ~ 20 mins ramp.
Staircase with field measurement every 500 A in both apertures
1 hr flat top at max field / current configuration
Check joints, may need to open up part of the joint box to get V-taps in?
Three machine cycles!

13. MQY Test project
MQY ?
Mount current lead-box on magnet, for independent powering?
Electrical testing
Quench heaters (insulation , discharge)
Magnet Ground insulation
Field Measurements ?
Cold testing.

14. Cold testing Set up rotating field probes in both apertures?
Std. electrical checks.
Cool down 4.3 tonnes larger than MQ. 3 days?
Set up QPS
Test field measurement. 1 day, may be more?
Training 1.9 K, 4 quenches a day ? 2 days
50% and 90% A1/A2 at 4.5 kA 2.25 kA & ?/?
Field measurement with 50% diff. 2 days
QLIQ test , reconfigure onto one PSU. ? Simulation needed!
Warm up, thermal cycle ?.
Total 12 to 15days

15. Conclusions / Comments
Two power supplies, control set up needed
High energy , carful pre testing to predict pressure and limit it!
Field measurement two rotating probes, or only measure one aperture, or thermal cycle to be abler to measure both apertures at all currents.
Two to three week testing >>>>>>>>>>>>>>>>
Joint tests after siting in air for 7 to 10 year’s? open joint box and have a look!
Should we also test MQM?