Nitrogen release from the TT2A cryogenic solenoid systems

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Presentation transcript:

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

LN2 circuit (old) Old scenario 100 % exhaust to surface/atmosphere P.Titus, MIT videoconference, 3rd May 2005 A.Fabich, CERN

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 videoconference, 3rd May 2005 A.Fabich, CERN

LN2 circuit (new) Additional line to TT10 Activated LN2 to TT10 Other to surface videoconference, 3rd May 2005 A.Fabich, CERN

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? videoconference, 3rd May 2005 A.Fabich, CERN

surface at access shaft to TT2 4 nToF11 Access pit Control room TT10 Ventilation shaft 2 1 videoconference, 3rd May 2005 A.Fabich, CERN

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) 4 ~85 m TT10 2 1 p-beam 3 videoconference, 3rd May 2005 A.Fabich, CERN

Ventilation line 4 1 ~85 m TT10 CERN staff is investigating best line feed hole drilling (also for optics) Long path in TT10 Avoid cold pipe installation Heater might be required install temporarily some fans to push nitrogen gas through TT10 towards ventilation shaft ~85 m TT10 1 videoconference, 3rd May 2005 A.Fabich, CERN

Ventilation performance Extraction at building 806 Additionally pushing at BA2 (in SPS) Ventilation for TT10 and a SPS sector Max. debit 27000 m3/h Per cycle up to 200 liter LN2 needed 200 liter LN2 = 160 m3 nitrogen gas ventilated within seconds = simultaneous to release Flow in TT10: 0.5 - 1 m/s average Contact TS/Cooling&Ventilation: D.Burgales, … Next steps: contact with safety/cryogenics confirm safe operation of 100 % release to TT10 videoconference, 3rd May 2005 A.Fabich, CERN