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Nitrogen release from the TT2A cryogenic solenoid systems

Nitrogen release from the TT2A cryogenic solenoid systems. A.Fabich CERN AB-ATB, Switzerland Videoconference, 3 rd May 2005. LN2 circuit (old). Old scenario 100 % exhaust to surface/atmosphere. P.Titus, MIT. Restrictions to nitrogen release.

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Nitrogen release from the TT2A cryogenic solenoid systems

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  1. Nitrogen release from the TT2A cryogenic solenoid systems A.Fabich CERN AB-ATB, Switzerland Videoconference, 3rd May 2005 A.Fabich, CERN

  2. LN2 circuit (old) Old scenario • 100 % exhaust to surface/atmosphere P.Titus, MIT A.Fabich, CERN

  3. Restrictions to nitrogen release • NO release of activated LN2 directly to atmosphere • Release of activated nitrogen to TT10 • See memo • Minimize activated LN2 • Remove LN2 previous to beam extraction • <1 liter remaining in cryostat Memo available: at homepage A.Fabich, CERN

  4. LN2 circuit (new) • Additional line to TT10 • Activated LN2 to TT10 • Other to surface A.Fabich, CERN

  5. LN2 circuit (new) Minimum LN2 rests in cryostat • < 1 liter • Activated by proton beam • Not vaporized by solenoid • Mixes with new cooling cycle • Release of ALL LN2 to TT10 • ODH? A.Fabich, CERN

  6. 1 2 4 surface at access shaft to TT2 • nToF11 • Access pit • Control room • TT10 Ventilation shaft A.Fabich, CERN

  7. 1 3 2 4 underground  surface (2) beige/orange = = surface black/blue = = underground • nToF11 • Access pit • Control room • Ventilation shaft Distance 1 to 4 nToF11 to ventilation ~ 120 m (85 m within TT10) ~85 m TT10 p-beam A.Fabich, CERN

  8. 1 4 Ventilation line CERN staff is investigating • best line feed • hole drilling (also for optics) Long path in TT10 • Avoid cold pipe installation • install temporarily some fans to push nitrogen gas through TT10 towards ventilation shaft ~85 m TT10 A.Fabich, CERN

  9. Ventilation performance • Extraction at building 806 • Additionally pushing at BA2 (in SPS) • Ventilation for TT10 and a SPS sector • Max. debit 27000 m3/h • 150 liter LN2 = 1000 m3 • ventilated within 2 minutes = simultaneous to release • Flow in TT10: 0.5 - 1 m/s • Next steps: • contact with safety/cryogenics • confirm safe operation of 100 % release to TT10 A.Fabich, CERN

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