Big helium venting nozzles closed
Yesterday 8 June the big helium venting nozzles were closed by telecommand from ESOC. Successful closure of the valves was immediately confirmed by an increase of the temperatures of the phase separator, the level 1 and the external vent line as well as the pressure in the external vent line. The cryostat behaviour is nominal.
This was the last planned activity on the helium system, from now on the cryostat will be in passive control.
[P. Garcia-Lario from HSC ESAC, posted 11 June 2009]