Nick Lumb, IPN-Lyon 24 April 2009 Lyon CO2 blow system Nick Lumb, IPN-Lyon 24 April 2009

(Very) preliminary test Stop CO2 flow Increase CO2 Flow rate Adjust ΔP Do nothing 0.45 → 0.67 g/s Heat @ 13W Heat @ 54W Start CO2 flow Heat @ 13W Heat @ 50W

Some remarks Low pressure side @ 23.5 bar according to manometer → should correspond to -15°C Single temp sensor used → not properly calibrated Will soon have 7 (carefully calibrated) sensors in fridge + 7 outside Fridge was at -20°C (range is unfortunately limited between -24 and -17) I was changing parameters often! System may need more time to stabilize… Basic message: system is built (no leaks @ 57 bar!), fine tuning to follow