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2018/05/13 (Sunday)

Previous Day

Status: Discovered blockage at 77K yesterday. Warming up. Helium in IVC and cryostat vacuum jacket, Still and MC heaters on @ 20 mW
0910 MC(Cernox) = 239.8 K
1110 MC(Cernox) = 248.2 K
warming time constant around 12.4 hours, should hit 273 K around 8pm
1435 MC(Cernox) = 259.5 K
1635 MC(Cernox) = 265.0 K
1910 MC(Cernox) = 270.7 K
2100 MC(Cernox) = 274.1 K
2245 MC(Cernox) = 275.6 K
2249 Open valve to cryostat vacuum jacket. Vacuum manifold reads 1.0 mbar. Turn on scroll pump and start pumping.
2254 Manifold reads 8.6e-2 mbar. Begin turbo pumping, turn off scroll pump. That was quick.
2255 MC(Cernox) = 275.7 K

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