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Analysis of Quench Events in Magnet Apertures: Insights from Current Cycles

This study analyzes various quench events in magnet apertures, focusing on their relationship with current cycles. Key experiments include quenching in B2 and B1 apertures, examining both beam-induced and heater-induced quenches. The research highlights differences in resistive zone development, the speed of normal zone propagation, and the voltage offsets across coils during these events. Findings suggest a variation in mechanisms driving current changes and voltage spikes, providing insights into quenching behavior and the interaction of particles with the coil.

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Analysis of Quench Events in Magnet Apertures: Insights from Current Cycles

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  1. Q6 quench test Events analysis

  2. Channel assignment LTOT = 36 mH LMQM = 15 mH LMQML = 21 mH B2 B1 MQM MQML

  3. Current cycles Experiments with the beam finished by quenching the magnet (B2 aperture).

  4. Current cycles Training quench on B1 aperture

  5. Current cycles Heater induced quench

  6. Quenchino (?) vs. quench PC reaction to decreased current? FPA – PC is switching ON the crowbar Resistive zone appearing in the coil Quench heater firing

  7. Beam induced quench vs. training quench Resistive zone appears earlier and develops faster for the training quench (more current in the magnet) Different aperture initiates the quench

  8. Beam induced quench vs. training quench Differential signal – visible jump resulting from a size difference between apertures Resistive zone starts to develop The quenching aperture is ramping up -> offset in voltage across each coil

  9. Heater induced quench added No inductive and no resistive voltage before the heat from the heaters arrives to the coil As the current is the same for the beam and heater induced quench – the propagation of the normal zone occurs at the same time and develops with the same speed. For the training quench it goes faster.

  10. All signals together…

  11. Longer time scale

  12. Training quench alone

  13. Heater induced quench alone

  14. First event before the training quench

  15. Second event before the training quench This event occurred about 200 ms before the magnet quenched. Nothing special is visible on the current readout in TIMBER.

  16. Quenchino ???

  17. Injection (178 A)

  18. Injection (178 A)

  19. Injection (178 A)

  20. 1000 A

  21. 1500 A

  22. 2000 A This event can be seen in PM files.

  23. 2500 A, quench

  24. PC can really see decreased current

  25. Conclusions • Lost particles really interact with the coil and an electrical signal is visible across it. • Mechanisms that that drive the current change and the voltage spike are not yet explained. • The two effects might have different causes. • After the heater firing all seems to be clear.

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