From: Frank Geurts (geurts_at_rice.edu)
Date: Tue Mar 18 2003 - 18:13:36 EST
Zhangbu,
i hope you made it back safely from foggy N.C.
Could you use tomorrow's access to check some issues we have w/ the TCD.
You're on the tofp-list so you probably saw all the messages about the
alleged TOF-hangs-STARdaq problem. By now, more and more circumstantial
evidence points again at the TCD or the translator unit we use to
convert the TCD signals for the BiRa.
I would like to do a simple test during tomorrows access: we ask Tonko
to run a pedAsPhys with TPC+TOF and once the system hangs you can check
on the platform where and how that busy is generated. If you look at
John's diagram the busy is an OR of three inputs. I claim that the TOFp
DAQ Busy (Jorway41 J11) is cleared. However, I am not sure about the L0
TCD pulse (a direct feed from the TCD front-panel Out-2) or potential
problems with the TOF System Busy Latch (PS794 2-6-1), although the
latter doesn't show up in any standalone test we've done so far ...
Also, it would be nice if you could talk to the trigger folks and get
them to recheck the connections to and from the TOF TCD and maybe
explain a little more what was done during last access (how far is the
TOF TCD located from the FPD TCD???)
If this doesn't work out we'll use next weeks access to diagnose this
further but won't be able to run for the rest of the dAu run.
Comments? Anybody?
cheers,
frank
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