1j. gu cern csc meeting july 2008 daqmb/febs readiness for first beam jianui gu the ohio state...
DESCRIPTION
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)TRANSCRIPT
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1J. Gu CERN CSC Meeting July 2008
DAQMB/FEBs Readiness for First Beam
Jianui GuThe Ohio State University
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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
![Page 3: 1J. Gu CERN CSC Meeting July 2008 DAQMB/FEBs Readiness for First Beam Jianui Gu The Ohio State University](https://reader035.vdocuments.net/reader035/viewer/2022062413/5a4d1b577f8b9ab0599a9db4/html5/thumbnails/3.jpg)
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)
~5nsecdominated by electron drift
Cathode Pulse Peak Time (avg 6 planes)
![Page 4: 1J. Gu CERN CSC Meeting July 2008 DAQMB/FEBs Readiness for First Beam Jianui Gu The Ohio State University](https://reader035.vdocuments.net/reader035/viewer/2022062413/5a4d1b577f8b9ab0599a9db4/html5/thumbnails/4.jpg)
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 electronicsbefore first beam
On Chamber Problems:
12 CFEBs (kill 1/5 chamber each) 9 ALCTs (kill full chamber each)
Enter run with 97% Chamber Live