1J. Gu CERN CSC Meeting July 2008 DAQMB/FEBs Readiness for First Beam Jianui Gu The Ohio State...
-
Upload
jayson-atkins -
Category
Documents
-
view
216 -
download
0
description
Transcript of 1J. Gu CERN CSC Meeting July 2008 DAQMB/FEBs Readiness for First Beam Jianui Gu The Ohio State...
1J. Gu CERN CSC Meeting July 2008
DAQMB/FEBs Readiness for First Beam
Jianui GuThe Ohio State University
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
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)
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