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Calorimetry Summary

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Title: Calorimetry Summary


1
Calorimetry Summary
  • Dhiman Chakraborty, NIU
  • Linear Collider Workshop
  • UC Santa Cruz, 29-june-2002

2
The calorimetry WG of ALCPG
  • Coordinates RD between univ/lab research groups,
    funding agencies, consortia.
  • A forum for discussion and sharing results. Meets
    biweekly mon, 330-500 pm, CST. Video/phone
    conferencing available.
  • Status, plans, docs, meeting info, archives
    www.slac.stanford.edu/xorg/lcd/calorimeter/
  • To join, contact WG leaders (see above url).
  • Mailing list (listserv) lcd-cal_at_fnal.gov

3
Goals for this meeting
  • Learn from experts about important issues, past
    experience, guiding principles.
  • Progress reports, plans from groups that have
    started RD already.
  • Expressions of interest from those planning to
    join soon.
  • Lots of discussions exchange ideas about
    technologies, algorithms, funding requests,

4
A few statistics
  • 5-hr session (stretched from 3) yesterday.
  • 17 talks (from 17 speakers).
  • At least as many more listeners (who didnt give
    a talk).
  • No one slept, no one got hurt, physically or
    emotionally, despite violent agreement on some
    issues.
  • The level of participation is most encouraging.

5
Results of this meeting
  • A list of RD topics being covered has been
    prepared (soon on our web page).
  • Includes groups involved, their contact summary,
    status/plans, funding requests etc.
  • Each group will maintain its own web page.
  • Also a prioritized list of all RD needed.
  • Together, help new participants decide what they
    want to do, who to work with.
  • Figuring out how to write proposals.

6
Physics requirements (Turcot)
  • Need unprecedented energy and direction
    resolution for jets, photons, invisibles.
  • 30/sqrt(E) for jets to separate W Z.
  • Precise and accurate missing energy resolution
    for SM as well as new physics.
  • Must be able to find non-pointing photons a
    tell-tale signature of GMSB.
  • New algorithms required to meet E resolution
    goal.
  • Hermeticity crucial for missing energy
    measurement.

7
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8
Design constraints
  • Min inner radius of barrel limited by tracking
    resolution requirement, 1.5 m.
  • Max outer radius limited by budget and desire for
    5T B field in entire cal, 2.5 m.
  • Similarly for length 3-5 m.
  • Fineness of lateral and radial segmentation
    limited by budget, technical challenges 0.25
    cm2 (ECal), 1-10 (25?) cm2 (HCal),

9
The Energy Flow Paradigm (Graf, Maciel, Bower)
  • Hadron calorimeter has the poorest E resolution
    up to 100 GeV. Dont use it any more than you
    have to.
  • Use precision tracker to measure momenta of all
    charged tracks in a hadronic jet
  • (0.6 E), and ECal for photons (0.25 E).
  • This leaves only long-lived neutral hadrons
    (lt0.15 E) to be measured by the HCal.

10

Energy flow algorithms
  • Must have the ability to separate charged
    clusters from neutrals.
  • Requires a tracking calorimeter with fine 3D
    granularity many layers of cells of small
    lateral dimensions.
  • The baseline SD design has gt30M cal channels.
  • Accurate cell-by-cell energy measurement may be
    less important save cost by reducing dynamic
    range digital HCal?
  • dE/Elt0.3E/sqrt(E) may be achievable.

11
HCal technology choices 1. Scintillators
(Zutshi for NIU)
  • Proven technology, ample experience.
  • No fluids, HV, I, T-sensitivity in detector.
  • Stable, robust.
  • Flexible dynamic range.
  • Tough challenge to route fibers without
    compromising hermeticity.
  • Too expensive? How small is small enough for
    lateral segmentation?

12
HCal technology choices 2. RPCs (Magill for ANL)
  • Relatively inexpensive.
  • On-board digitization eases readout.
  • Initial tests w/ glass are encouraging good
    eff.
  • HV required.
  • Robustness, stability over time, noise?

13
HCal technology choices 3. GEMs (White for UTA)
  • Relatively inexpensive.
  • On-board digitization eases readout.
  • New technology, never tried for Cal.
  • Robustness, stability over time, noise?

14
ECal technology choices 1. Si-W (Breidenbach
for SLACOregon)
  • Proven technology, ample expertise.
  • Superb 3D segmentation, resolution.
  • Perfect for energy flow algorithms.
  • Too expensive?
  • Some electro-mechanical challenges are new.

15
ECal technology choices 2. Crystal (Zhu for
Caltech)
  • Proven technology, ample expertise.
  • Good energy and position resolution.
  • Excellent hermeticity.
  • Electro-machanically sound.
  • Relatively inexpensive.
  • Very limited longitudinal segmentation.
  • Will it compromize E-flow?

16
Simulation efforts
  • Joint undertaking between SLAC, NIU others. Much
    in progress
  • transition to GEANT4,
  • more flexible geometries,
  • prototype simulation,
  • Parametrized fast detector simulation.
  • Great need across the board.
  • Exciting opportunities for everybody.

17
Summary
  • Many expressions of interest.
  • Several efforts are already underway.
  • Many more are imminent.
  • Most, but not all high-priority tasks are
    receiving attention.
  • Collaboration forming, smooth so far.
  • Need funding for continuation of RD.
  • Most of all, we need your participation.
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