Download - RB45 - provoked quench at 9.5 kA
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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
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RB45 - provoked quench at 9.5 kATemperature profiles:
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RB45 - provoked quench at 9.5 kAQuench Detection
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RB45 - provoked quench at 9.5 kA Quench Detection
• Quench detection performed very well
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RB45 - provoked quench at 9.5 kA Magnet Protection
• All quench heaters were fired correctly
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RB45 - provoked quench at 9.5 kA
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RB45 - provoked quench at 9.5 kA
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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
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First training quench in RB45Current decay
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First training quench in RB45 Quench Detection
Current decay
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First training quench in RB45 Temperatures:
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First training quench in RB45 Temperatures:
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First training quench in RB45 Pressure build-up:
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First training quench in RB45 Pressure discharge:
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First training quench in RB45
Trying to recover….
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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
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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
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~ 4m 51s
RB45 – second training quench at 9859 A
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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
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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
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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……