Checked Re-timing Signal with L1A

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User name V. Sulkosky

Log entry time 13:29:40 on November 17, 2008

Entry number 249383

This entry is a followup to: 249192

keyword=Checked Re-timing Signal with L1A

During the controlled access today, I checked the re-timing signal
with respect to the L1A signal before going into the re-timing module in
the left HRS TS.

And the results compared to last week are ...

"Nothing Changed!"

Well actually the timing for T1 changed by about 10 ns compared to last
week, but I assume that has to have something to do with re-timing on the
BigBite side.

A few notes:

1) The re-timing signal arrives about 50 ns after L1A for T3's (cosmics).
This is comparable to what we measured last week.

2) The re-timing signal arrives about 20 ns after L1A for T5's (EDTM).
Also comparable to what we measured last week.

3) The re-timing signal arrives about 12-16 ns after L1A for T1's.
Last week this was also about 20 ns.

Unless we have a huge change with the beam, it appears the re-timing
is working as expected.

So the question still remains, why do we see a shift in the left HRS
timing spectra since last Thursday?

A copy of this log entry has been emailed to: rom,camsonne,kalyan,xqian,jiang