User name Moffit
Log entry time 22:14:39 on June11,2004
Entry number 125400
keyword=Right Arm Sync Resolved
Looked at the difference between the Right Arm gate and the Counting House gate. It was 4.12us. Subtracted the time for transmission (1.72us ) we get 2.4us (same as what the sync monitor was saying).
Perplexed... Kent and I looked at the MPS that's sent to the Right Arm. Turns out IT was delayed (before going to the patch panel) by 2.4us... and had a reflection.
We tracked this down to a cable used by Compton to readout MPS. This cable was moved from the P/S Level Translator to a Lecroy Fanout. After moving this cable, MPS no longer looks to have any reflections going down to the Right Arm. David Lhuillier ran Compton (compton run #8277)... and said MPS on his end looks all right.
Ran the HAPPEX DAQ (run #2037).. and it looks like the sync problem has been resolved.