Previous: Using the 75 litre dewar
Up: Cryostat description
Previous Page: Using the 75 litre dewar
Next Page: Filters for use with the CCD cameras on La Palma

Further notes

If the cryostat does warm up, it is possible to refill it and use it although the vacuum will ultimately degrade and repumping will be necessary in time. There is no practical way of monitoring nitrogen level in the cryostats and so routine personal checking is necessary. The temperature monitor is not a sufficient indicator and could only show the situation afterwards.