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ATLAS Muon Spectrometer Calibrations. Jason Hindes Dan Levin . Muon Spectrometer: Why? . Answer 1: Muons are weakly interacting: Answer 2: One Visible signal is H->2Z-> 4l the cleanest is 4 μ (lowest background). What we need: muon energy and momentum. How?.

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Atlas muon spectrometer calibrations

ATLAS Muon Spectrometer Calibrations

Jason Hindes

Dan Levin


Muon spectrometer why
Muon Spectrometer: Why?

  • Answer 1: Muons are weakly interacting:

  • Answer 2: One Visible signal is H->2Z-> 4l the cleanest is 4 μ (lowest background).

  • What we need: muon energy and momentum


How?

  • JJ Thompsommeasurement of e/m by bending electrons in a magnetic field.

  • More complicated, but same principle: Curved path is function of momentum

  • If we can measure the curvature, we can measure the momentum.


The story drift tubes and rts
The Story: Drift Tubes and RTs

Drift Tubes permeate the entire spectrometer. Design: 1-6m length, high voltage anode wire, grounded aluminum outer wall, and gas (93Ar 7CO2)

Our Stop Watch: External Trigger, Time of Pulse

RT from some autocalibration procedure converts drift times into drift radii.

Connect the drift radii from different tubes to determine track.


Current work
Current Work

  • Autocalibration procedure that we like to use outputs RTs under standard conditions

  • Correct this function for local chamber conditions: temperature, B-Field, wire sag

  • Without corrections, determination of a muon’s track can’t be accurately determined => 7kiloton piece of junk.

  • How we solve this is pretty cool, but I’ll tell you about it next time!


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