1. 1J. Gu CERN CSC Meeting July 2008 DAQMB/FEBs Readiness for First Beam Jianui Gu The Ohio State University

2. 2J. Gu CERN CSC Meeting July 2008 Electronics - First Beam Overview This is a Machine Run (for them and us) First Priority is to “Time In” the Electronics Beam Will Advance in Stages: Halo Muons, Low Luminosity Collisions,… Thus timing will advance in stages… Tools: Greg’s Radioactive Triggers(done now) special runs single chambers requires rate Shift timing all chambers take data requires data analysis no special software written Cosmic Ray – Crude Timing random arrival (anytime) random direction (speed of light) Colliding Beams-Precise Timing precise arrival (3 nsec) fixed time of flight Data and Time will be taken for Solely Hardware Purposes

3. 3J. Gu CERN CSC Meeting July 2008 Electronics - First Beam Overview Improved timing should lead to: DAQ Board Readout Efficiency 100% Reduction of Board Readout Errors Beam gives better understanding of timing and synchronization: Test Beam 2003 –time structured beam Time (bunch crossings) Cathode Pulse Peak Time (avg 6 planes) Time (nsec) LHC Beam Structure (initial separation 75 nsec)  ~5nsec dominated by electron drift Cathode Pulse Peak Time (avg 6 planes)

4. 4J. Gu CERN CSC Meeting July 2008 Electronics – Expected Status Live Electronics First Beam by next week all pc crate electronics done bad CFEBs,ALCTs connector, cables … Expect no access to chamber electronics before first beam On Chamber Problems: 12 CFEBs (kill 1/5 chamber each) 9 ALCTs (kill full chamber each) Enter run with 97% Chamber Live