Minimum Bias Trigger Scintillators

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Presentation transcript:

Minimum Bias Trigger Scintillators Rachel Hyneman UM-CERN-REU 2014

The MBTS – An Overview One of the triggers available on ATLAS detector Comprised of a set of scintillating panels located near end-caps of the detector, perpendicular to the beam line Provided the lowest bias trigger for low-luminosity Run 1 events Minimum bias = loose kinematic requirements to trigger A diagram of one side of the MBTS used in Run 1 Performance of the Minimum Bias Trigger in p-p Collisions at √s = 900 GeV ATLAS-CONF-2010-025

The MBTS Within the ATLAS Detector Two Sides, labeled “A” and “C” In-situ Calibration of MBTS with 900 GeV and 7 TeV Data Eric Feng, Sept 2013

Overview of MBTS Electronics Scintillating Plate (MBTS Counter) PMT (via Optical Fiber) TileCal Patch Panel (TCPP) (Part of Tile Calorimeter Electronics) MBTS Adapter Boar Discriminator Central Trigger Processor (CTP)

ATLAS Minimum Bias Trigger Scintillator Upgrade for LHC RunII Changes to MBTS for Run 2 Using fewer channels for read out 12 on each side (previously 16) Outer ring: 8 panels → 4 panels New scintillator layout shown in pink outline Discriminators: leading edge → constant fraction ATLAS Minimum Bias Trigger Scintillator Upgrade for LHC RunII Antonio Sidoti

Status Already completed: Combine outer scintillating plates Reroute outputs through different TileCal drawers and PMT’s Use directly injected charge pulse to confirm correct installation All of side C and outer ring of Side A correctly installed (with a few anomalies) To Be Completed: Use laser to check PMT functionality Calibrate outputs Replace leading-edge discriminators with constant-fraction discriminators Software trigger work (starting in July)

Flaming Crepe in Paris!

More Info ATLAS Conference Notes ATLAS-CONF-2010-068, “Performance of the Minimum Bias Trigger in p-p Collisions at √s = 7 TeV” ATLAS-CONF-2010-025, “Performance of the Minimum Bias Trigger in p-p Collisions at √s = 900 GeV”