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magnet operations vs. HBD

magnet operations vs. HBD. HBD Meeting – 03/20/2007 Manuel Proissl. First assumption in February verified : there is a direct correlation between magnet operation and trips in the HBD Quick Reminder: |> 02/08/07 [+-] :: duration of ~3:30h

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magnet operations vs. HBD

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  1. magnet operations vs. HBD HBD Meeting – 03/20/2007 Manuel Proissl

  2. First assumption in February verified: there is a direct correlation between magnet operation and trips in the HBD • Quick Reminder: |> 02/08/07 [+-] :: duration of ~3:30h • 14 trips in West (8 in ramp up / 0 during operation / 6 in ramp down) • 31 trips in East (15 in ramp up / 5 during operation / 11 in ramp down) |> 02/09/07 [++] :: duration of ~1:30h • 3 trips in West (1 in ramp up / 2 during operation / 0 in ramp down) • 24 trips in East (11 in ramp up / 6 during operation / 7 in ramp down) |> 03/14/07 [+-] :: duration of ~2:00h / 28 West trips, 6 East trips • 1 dI change in West (1 in ramp down) • 7 dI change in East (6 during operation / 1 in ramp down) 1

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  4. **WN5 has been turned off after 3 trips in a row, when ramped back up to 3100V around 17:00 :: +0.4 -> +0.8 ***WS3 has been disabled on 02/07 3

  5. **@15:00 ES4 returned :: 0.0 -> +0.6 4

  6. All modules whose dI have been changed 5

  7. All modules whose dI have been changed 6

  8. Our reaction: Turning off HV during ramps (up/down) RESULTS ARE VERY PROMISING 7

  9. ** WN1 returned during operation :: +0.5 -> +0.3 ***ES2 has been disabled on 03/17 ~17:00 8

  10. comment: everything looks pretty stable!! 9

  11. *substract 2 :: these have been induced by ES2!! comment: everything looks pretty stable!! 10

  12. CONCLUSION • Overall comparison: HBD looks much more stable now! • Less trips than before. Trip/magnet correlation seemed to be vanished… NO trips after ramp up. • NO changes in the dI so far! • If CMs trip during the run, we should follow this procedure and turn the HV during ramps off. 11

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