Last updated on 29-Aug-2001 9:51 AM
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Telescope Installation

UKIRT Installation

This process will require further refinment from what is written here to form a basis from which to work.

 

1.   Assumptions

The assumption is the Michelle Instrument will already have been through the liquid Nitrogen pre cool circuit close to the north pier on the telescope and will probably have been through a health check using normal software i.e. until it is basically cold and fully operational. There is some requirement to minimise the time the system will be disconnected from the coolers so that it does not warm up too much but as the balancing requirements for the telescope will require considerable time anyway perhaps this is not a problem.

First prepare the UKIRT Telescope to accept the instrument by fitting the Z bracket to the flat portion of the mirror cell and the angled tubular mounting to teh angled face of the mirror cell, secure to the appropriate torque and tether the telescope in preperation for fitting Michelle and removing the balance weights.   This operation is likely to take more than one day and so a blank night of observing should be scheduled.   Like wise prepare the instrument for interface into the telescope by ensuring that all the G10 spacers and stainless steel shin plates have been fitted to the top surface of the cryostat and in addition the circular tube that interfaces to the centre rear section of the cryostat all bolts should be taut RM16 torque should be 1.15 Nm.   Power down the array if it has been running using the appropriate procedures from the document written by Derek and remove the Edict warm electronics which will probably be on a table next to the trolley assembly.   Close any vacuum port valves and disconnect any turbo pumps that may still be running.   Now record in the table below all temperatures within teh cryostat before depowering the motor control racks and disconnecting all the motors and temperature sensors and status switches.   Remove any balast weights from teh telescope which are likely to be obscured by the presence of teh instrument this will put the telescope partly out of balance but will make their removal much easier,