User name R. Michaels
Log entry time 04:44:47 on April29,2007
Entry number 200462
This entry is a followup to: 200461
keyword=raster repair (but for how long ?)
We swapped linear driver #6 out and put #8 in. We did not
swap the 24V supply.
There is some confusion about notation. MCC calls this the
"vertical" raster, presumably because the magnetic field is
vertical. Historically I called it the horizontal (deflection).
I'll go with MCC notation for the following.
We noticed that driver #5 was deployed for horizontal.
Meanwhile, driver #7 is presently in the radcon staging area
shelving inside the Hall. We put driver#6 near those shelves
too, on the floor.
Regarding the history, the latest 2 breakages were vertical
(MCC notation), the one before that was horiz, and the one
before that is unknown at this time. Therefore it seems to be not
the same circuit each time, which is relevant to the diagnosis.
Regarding 24V supplies, there's one in my office near my desk
and one in cabinet CRA_CAB4 in the back room of counting room.
I'll order more Monday (expedited). Company is www.astrodyne.com.
Yes, we need to fix this design with a beefier PS.
I believe the max current is 30A and the experiment has been
using 17A typically. I am unfortunately mystified why they break