1. Sketch and rough estimation of a colder trap for AdV central area
Size: external diameter= 1.5m , height=1m
Speed >=5000l/s (N2)
Daily consumption LN2<50liters (<100 watt) Lhe<25 liters (<1 watt)
AL shields, no superinsulation. 1 face exposed to a grid cooled at 77K
Port on a 1000mm flange 15keur , 1valve keur, trap 120keur = 170keur?
Running costs: LN2<300eur/mese (0.2eur/lt) LH2<5000eur/mese (6eur/lt)
Capacity LN2 ?liters , LHe<250liters, autonomy >1 week
Refill period: weekly. Helium is not recovered!?
Refill means: portable dewars. 200liters of Lhe possible?
Alternatives: Neon + recondenser+zeolites, (LH2 ?) . 20K ?
400mm port on a 1000mm flange. 500/650?
20cm, LN2
70cm, LHe
30-4K

2. comments
Lhe not recovered -> work at 20K, to use latent + sensible heat?
Remote condenser (15m) for Neon. Should work, more complex because the compressor
@ 30K PsatN2=10^-3mbar PsatO2=10^-4 mbar. Zeolites/Ac. carbon
Rem:He more dangerous for people (burning)
More difficult for cool down; regenerations are more long
Motivations: Air too would be ‘sticky’ and not quickly removable from well baked tube walls