1. J. Rutherfoord & P. Schacht 17 May 2004
ATLAS Liquid Argon CBT-EC2 “crack studies” Goals and Run Plan – Early version
J. Rutherfoord & P. Schacht
17 May 2004

2. CBT-EC2 Goals – Summary Liquid Argon TDR - 1996
Study transition at |h| = 3.2 for
ETmiss determination
rms of resolution function
Tails of resolution function
What is probability that jet ET of 300 GeV will be mis-measured with less than 150 GeV? < 1  10,000 ?
Jet tagging efficiency
How low in ET can we still identify jets?
17 May 2004
J. Rutherfoord

3. CBT-EC2 Run Plan - Input FCal community from conference calls
Peter Schacht representing MPI discussions
Everyone is invited to help iterate towards the next version
Further iterations, even during the run, are expected
Run coordinators will implement the plans
17 May 2004
J. Rutherfoord

4. CBT-EC2 Run Plan - Overview
Technical run – All systems working
Tune, calibrate, and detect problems
Scan through the ‘crack’ region with electrons and hadrons *****
Interleave stability checks
Special tests
17 May 2004
J. Rutherfoord

5. CBT-EC2 Run Plan - Technical Run
Without beam, check out …
Modules, cold electronics, HV, and cabling 
Warm electronics, trigger, BPCs, etc.
DAQ. Write dummy data.
Exercise offline and monitoring software
Write diagnostics
17 May 2004
J. Rutherfoord

6. CBT-EC2 Run Plan – Calibrate detector
Set up up beam line and tune beam
Calibrate separately in EMEC/HEC and FCal
High(?) statistics, all(?) energies
Full transverse acceptance in each of the two systems
Electrons, m’s, and pions (ID p’s or veto p’s?)
16 time samples, dual gain or autogain (?)
Transverse scan – look for and correct problems
17 May 2004
J. Rutherfoord

7. CBT-EC2 Run Plan– Scan the “crack”
Vertical scan (Primary goal of CBT-EC2)
2 or 3 vertical lines, 2 energies, e’s, p’s, and m’s
~1 Million triggers at each point on central scan line at one energy
16 time samples, autogain
Narrow and wide beam
Horizontal scan
In crack region at |h| = 3.2
17 May 2004
J. Rutherfoord

8. CBT-EC2 Run Plan- Stability Checks
At subset of ‘standard grid’
Every 24 to 48 hours
High energy electrons
Every 2nd check include pion run
Modest statistics
17 May 2004
J. Rutherfoord

9. CBT-EC2 Run Plan– Special Tests
Timing studies
Narrow beam, high energy, e’s and p’s
Calibration data over full DAC range
Non-linearities?
32 time samples to understand signal shapes
Dual gains to set autogain thresholds
Alignment with muons
Switch between + and – beam
Proton data
17 May 2004
J. Rutherfoord

10. CBT-EC2 – Yet to do Better specify each of the tasks
Flesh out details of each of the tasks
Better organize and time-order the tasks
Add to and subtract from the various tasks
Prioritize the tasks
Which are absolutely necessary at all costs?
Which can be dropped if we run out of time?
17 May 2004
J. Rutherfoord