chandra.romel@LIGO.ORG - posted 15:13, Tuesday 24 April 2018 - last comment - 17:31, Tuesday 24 April 2018(41644)
CP4 regen heater system
This morning Kyle valved back in the pressure build circuit on CP4 Dewar by opening the valve 1/4 turn CCW. The head pressure is now 17 psig and flow is between 50-60 scfhx100. The GN2 temperature dropped as a result to below 150C, so I increased the variac from 56% to 58%.
Increased variac to 60%. GN2 temps 150-160C. Leaving as-is overnight.