RB45 - provoked quench at 9.5 kA• Quench provoked in B17R4• 4 magnets quenched after quench propagation• Sequence of events:

Magnet t quench [s] I quench [kA] E [MJ]B17R4 0 9.5 4.4A17R4 0.14 9.5 4.4C17R4 33.094 6.866 2.3C16R4 235.021 1.887 0.2

Total 11.3

RB45 - provoked quench at 9.5 kATemperature profiles:

RB45 - provoked quench at 9.5 kAQuench Detection

RB45 - provoked quench at 9.5 kA Quench Detection

• Quench detection performed very well

RB45 - provoked quench at 9.5 kA Magnet Protection

• All quench heaters were fired correctly

RB45 - provoked quench at 9.5 kA

RB45 - provoked quench at 9.5 kA

RB45 – first training quench at 9789 A• Natural quench in C27L5• 3 magnets quenched (2 after quench propagation)• Sequence of events:

Magnet t quench [s] I quench [kA] E [MJ]C27L5 0 9.789 4.7B27L5 102.396 5.219 1.3A27L5 103.106 5.18 1.3

Total 7.3

First training quench in RB45Current decay

First training quench in RB45 Quench Detection

Current decay

First training quench in RB45 Temperatures:

First training quench in RB45 Temperatures:

First training quench in RB45 Pressure build-up:

First training quench in RB45 Pressure discharge:

First training quench in RB45

Trying to recover….

3180 1 2 

I (A) 8753 12006B (T) 6.19 8.44

Aper. D1 D2Pole L U

3392 1 2 3 4 

I (A) 8430 11460 12262 12777B (T) 5.96 8.06 8.60 8.95

Aper. D2 D2 D2 D1Pole U U U U

1217 1 2 3

 I (A) 12208 12369 12623B (T) 8.57 8.68 8.85Aper. D1 D2 D1Pole U U U

First training quench in RB45

RB45 – second training quench at 9859 A• Natural quench in A22R4• 3 magnets quenched (2 after quench propagation)• Sequence of events:

Magnet t quench [s] I quench [kA] E [MJ]A22R4 0 9.859 4.8B22R4 49.732 6.012 1.8C22R4 92.585 3.829 0.7C21R4 381.511 2.644 0.3

Total 7.3

~ 4m 51s

RB45 – second training quench at 9859 A

20 ms to reach voltage threshold

>1 s to reach voltage threshold700 ms to reach voltage threshold

230 ms to reach voltage threshold

RB45 – second training quench at 9859 A

3176 1 2

 I (A) 11800 12094B (T) 8.30 8.50Aper. D1 D1

Pole U U

2212 1 2 3

I (A) 11884 12560 12850B (T) 8.34 8.81 9.00

Aper. D1 D1Pole U L

3210 1 2

 I (A) 12315 12397B (T) 8.64 8.70Aper. D2 D2

Pole L U

3220 1 2 3 4 5 6 7 8 9 

I (A) 9870 10707 12177 12245 12357 12368 12397 12460 12547B (T) 6.96 7.54 8.55 8.60 8.67 8.68 8.70 8.74 8.80Aper. D2 D2 D2 D2 D1 D2 D1 D2 D1Pole U L L L U U L U U

10 11 12 13 14

11474 12024 12294 12407 125888.08 8.46 8.63 8.71 8.83D2 D2 D2 D1 D2

U U U U L

RB45 – second training quench at 9859 A

First conclusions

• During the first three high current quenches performed in RB45 all individual systems performed very well.

• During the first two quenches (9500 A and 9789 A) the quench propagation between “A” and “B” magnets was observed to be unexpectedly fast.

• During the last high current quench (9859 A) a “good” magnet quenched. Is this worrying? We’ll see with the next one……