User name J. Singh
Log entry time 07:18:07 on July25,2004
Entry number 129615
keyword=TECHS: Magnet Cryolevels Status + Problem found!fig 1 top is the left HRS magnet levels stripchart
fig 1 bot is the right HRS magnet levels stripchart
i have plotted only the LN2 levels over the last 24 hrs. on both plots, the following color conventions are used:
orange = Q1
purple = Q2
red = Dipole
yellow = Q3
the left septum hit empty @ 0539, but the coils temps have been rock steady.
At about 0620, Mark Stapleton (Cryo Guy) came into the Counting House and gave us an update. He found an "EV" (electrical valve) with a broken motor. This motor controls the valve. It is not responding. For now, he will open the valve up manually. One of the TECHs should come in and fix/replace/deal with this valve. The valve in question is CEV6751A. Mark says that the LN2flow into hall A is now higher than before (~25 grams per sec????).
Mark mentioned that Gary should come in and fix this in the morning. This could mean one of two things:
(1) Mark has called Gary. Gary knows he is supposed to come in.
(2) I have to page the hall A TECH-ON-CALL (Heidi). Then, she will coordinate the valve fixing procedure that may or may not include Gary.
I will get a hold of Mark again and clear up this confusion on my part.
at 0705, we noticed that the LQ2 and RQ2 levels have started to recover! incidentally, they were also the first ones to empty.
fig 2: elog 1226478 Hall A LN2 Problems by Mark Stapleton
FIGURE 1
FIGURE 2
