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CMS Area Working Group Meeting

CMS Area Working Group Meeting. Emergency (AUG) stops systems in CMS underground areas. Goal: To have 2 separate AUG networks UXC55 USC55 (no exception for LHC or Magnet areas) Avoid fast discharge of Magnet Implications:

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CMS Area Working Group Meeting

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  1. CMS Area Working Group Meeting martin.gastal@cern.ch

  2. Emergency (AUG) stops systems in CMS underground areas • Goal: To have 2 separate AUG networks • UXC55 • USC55 (no exception for LHC or Magnet areas) • Avoid fast discharge of Magnet • Implications: • Emergency stops in UXC55 must cut power on equipment located in the UXC55 even if the power comes from the USC55 • A list of such devices has been drafted but needs to be completed: • Coil racks in X4Near balcony • Magnet diffusion pumps on YB0 • All types of AI, He return heaters • Vacuum sensors, combined gauges(>1000V) • Related issue • The grounding scheme of the experiment might be compromised if unfiltered power is used on devices located on YB0 (ie pumps) • G Perinic & B Cure are to send their grounding schemes to S Lusin martin.gastal@cern.ch

  3. UXC55 Racks: X2 Near Side 2 coil racks will be powered on the LV network martin.gastal@cern.ch

  4. Emergency (AUG) stops systems in CMS underground areas • Suggestions by TS-EL: • Do not cut UPS power networks by AUG (red strips to be applies) • Use equipment stops (or similar means) on racks no connected to AUG • Install AULs in the laser room that is considered as a separate building. Activating these devices will not generate an alarm and call the fire brigade • Install a hardware switch at substation level to shut down the whole underground area (from CMS CR) • Use the LV network to power devices in UXC55 when appropriate • Filtered power (grounding issue addressed) • Network cut by AUGs in UXC55 • Ok for coil racks- need to be connect to 230V contactors • For other devices such as diffusion pumps, sensors, R Lassausaie proposed scheme has been endorsed (see his presentation) martin.gastal@cern.ch

  5. IT racks in USC55 to be protected by AUL • How it should be martin.gastal@cern.ch

  6. Présentation des installations de contrôle et de sécurité de l’aimant CMS (by N Bourgeois) martin.gastal@cern.ch

  7. Emergency (AUG) stops systems in CMS underground areas • Actions to take to be ready for a general test on 15/02/2008: • Issue a document synthesising the position of AUGs in USC55 and UXC55 (R Lassausaie) • Review of document by Safety coordinator (M Arnaud), and GLIMOS (C Schaefer) • Execute work (INEO) • Organise reception & tests (G Cumer) martin.gastal@cern.ch

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