Adding more exchange gas and refilling LN2 seem to help cooldown further to 77K. This means the gauge meter at the turbo pump is showing incorrect values when filling exchange gas.
Pumping out the IVC for more than 24 hrs to lower the leak rate to below 10^-8 mbar L/s where we saw the leak earlier.
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LN2 blowout will complete by end of group meeting time. If we donot see a huge leak (~ 10^-6) the current leak is not getting worse atleast at 77K. We will proceed to 4K.
This is what it looks like slightly after beginning of LN2 blowout.
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