2014/08/19

1045	With G1=152 mbar, G2=156 mbar, P1=16 ubar and mixing chamber temperature of 194.5 mK, attempt to reduce mixing chamber temperature and better understand what issues are affecting the fridge.
1050	After reducing V6 to 75%, mixing chamber temperature stabilizes to roughly 194.5 mK.
1057	After reducing V6 to 50%, mixing chamber temperature stabilizes to roughly 194.5 mK.
1105	After reducing V6 to 25%, P1 has risen to 90 mbar, G1=77.3 mbar adn G2=82.2 mbar, and mixing chamber temperature has risen to 500 mK and is increasing.
1110	G1=52.5 mbar, G2=58.6 mbar, P1=1000+mbar and mixing chamber has a temperature of 600 mK and rising. Raise V6 to 40%.
1118	G1=272 mbar, G2=230 mbar, P1=.3 mbar, mixing chamber temperature at 382 mK and rising.
1123	G1=224 mbar, G2=230 mbar, P1=.3 mbar, mixing chamber temperature at 408 mK and slowly falling.
1150	G1=149 mbar, G2=153 mbar, P1=.22 mbar, mixing chamber temperature at 199 mK and oscillating. Changing V6 to 35%.
1155	G1=147 mbar, G2=150, P1=.32 mbar, mixing chamber temperature at 205 mK and dropping slightly.
1205	G1=152 mbar, G2=154 mbar, P1=.3 mbar, mixing chamber temperature at 224 and dropping.
1210	G1=155 mbar, G2=157 mbar, P1=.32 mbar, mixing chamber temperature at 212 and dropping. Change V6 to 45%. Fill LN2 cold trap full.
1216	G1=159 mbar, G2=158 mbar, P1=.2 mbar, mixing chamber temperature at 217 and rising.
1221	G1=158 mbar, G2=160 mbar, P1=.19 mbar, mixing chamber temperature at 276 and dropping.
1234	G1=153 mbar, G2=156 mbar, P1=.2 mbar, mixing chamber temperature at 197 and has started rising.
1237	Results of tests suggest restricting flow to still line either increased or does not affect mixing chamber temperature. Commence pumping to dump and stop 1 K Pot.
1555	Commence LHe transfer (27.9%).
1644	Finish LHe transfer (60.4%).
1805	G1=0.8 mbar, G2=733.8 mbar, P1=15 ubar. Close gate valve and condenser speedivalve. Close V6.
1811	Commence cryocleaning through coldtrap 1.Fill LN2 coldtrap full.