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ATLAS Liquid Argon CBT-EC2 “crack studies” Goals and Run Plan – Early version

ATLAS Liquid Argon CBT-EC2 “crack studies” Goals and Run Plan – Early version. J. Rutherfoord & P. Schacht 17 May 2004. CBT-EC2 Goals – Summary Liquid Argon TDR - 1996. Study transition at | h | = 3.2 for E T miss determination rms of resolution function Tails of resolution function

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ATLAS Liquid Argon CBT-EC2 “crack studies” Goals and Run Plan – Early version

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

  2. CBT-EC2 Goals – SummaryLiquid 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? 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 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 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 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 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 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 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 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? J. Rutherfoord

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