A Fourth Detector Concept (no name, yet)
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Transcript of A Fourth Detector Concept (no name, yet)
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A Fourth Detector Concept (no name, yet)
• Silicon Vertex: 3-4 layers, conventional
• Tracking TPC: 1 atm, moderate B field
• Calorimeter: measure all main fluctuations, obtain excellent energy resolution. Spatial (fine fibers), EM fraction (Cerenkov and scintillation), binding energy losses/neutrons (time readout, third fiber)
• Muon system: RPCs, CMS-like
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People, Contacts and Website
• John Hauptman, contact and MDI, ISU, [email protected]
• Richard Wigmans, R&D contact, TTU, [email protected]
• Aldo Penzo, INFN, Trieste
• Hans Paar, UC San Diego
• Nural Akchurin, Ken Carroll, Heejong Kim, TTU
• Oleksiy Atramentov, Jerry Lamsa, Sehwook Lee, ISU
• Website: www.phys.ttu.edu/dream
• Contains proposals, papers, talks, all data figures, and pictures.
• Clearly, we welcome collaborators
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Present Status: ± 2 years wrt others
• Calorimeter completely orthogonal to GLD, LDC, and SiD. Only similarity is use of word “calorimeter”.
• 10 million triggers in test beam; present test module DREAM is very well understood, measures hadrons and “jets” to nearly 20%/√E
• Measures e to 20%/√E, and tags µ.
• Robust, easy. Calibration, cost OK.
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R&D: present year
• “Dual-Readout Calorimetry for the ILC” – objective is to optimize an electromagnetic section, and to devise a more robust readout.
• “Ultimate Hadron Calorimetry” – attempt to measure fluctuations in BE (binding energy losses, mostly MeV neutrons) with a third fiber, a time readout, etc.
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R&D: next year(s)
• Build a second beam test module, wider and not as deep: 0.5m x 0.5m x 1.2m (brass, W) with triple readout, time history readout, and test dual-readout EM section in front.
• Time history readout with ATWD (S. Kleinfelder)
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Dual-Readout Module (DREAM)
“Unit cell”
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Fibers
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PMT readout box in H4 beam
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H4 beam – looking upstream
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H4 beam
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Cerenkov vs. Scintillation
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Correct event-by-event for EM fraction
σ/E = 2.65% at 100 GeV
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“interaction jets” – 0.1 λ lucite
200 GeV pions
σ/E = 2.15%
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Energy resolution of π’s and “jets”
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Energy resolution of electrons
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Muons into DREAM
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µ ionization and radiative energy losses
Average energy loss
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From a module to a 4π detector
• Only important point - the fiber densities must be constant throughout the volume
• Several possible solutions…this is RD1
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This dual-readout calorimeter can measure all the partons of the SM with comparable precision:
e, µ, q, γ, and therefore all W and Z decays
Mjj (GeV/c2)
Pythia processes 22 and 25, DREAM resolutions, jet cone reconstruction
e+e- WW & ZZ
W jj and Z jj
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Summary
These are new, and working, ideas in calorimetry: to make multiple measurements of each shower, and thereby reduce the fluctuations (spatial, EM fraction, BE losses) that dominate hadronic calorimetry.
We are a small group and would be most happy for a large group or groups to join.