Calibration Of The MINOS Detectors

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Calibration Of The MINOS Detectors

• Detectors
• Calibration
• Light Injection
• Muons

Ryan Nichol
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MINOS Detectors

• 3 Detectors
• Far Detector
• Soudan Mine
• Near Detector
• Fermilab
• Calibration Detector
• CERN
• Iron-Scintillator Calorimeters.

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Why Calibration Is Important

• Neutrino Oscillations
• Difference Between Far/Near Event Rate And
  Characteristics
• To Measure Mixing Parameters Require
• Relative Calibration
• 2
• Absolute Calibration
• 5

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Calibration Overview

• Main Factors In Calibration
• Cosmic Ray Muons.
• Strip-Strip Calibration Within Each Detector
• Relative Calibration Between Detectors
• Light Injection System
• Accounts For PMT/Electronics Gain Drift.
• Also Linearizes Response Of PMT/Electronics.
• Calibration Detector
• Absolute Energy Scale.

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Light Injection System

• Bright Blue LEDs Illuminate The WLS At The End Of
  Scintillator Modules.
• PIN Diodes Are Used To Measure The Light Level

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Light Injection Results
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Muon Calibration (Strip-Strip)

• Accounts For
• Scintillator Yield
• Wavelength Shifting Fibres
• Optical Cables Connections
• Characterise Strip By Muon Light Output.

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Muon Calibration At CalDet
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Currently Working On

• Muon Path Length Correction.
• Muon de/dx.
• Installation At Soudan Mine

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Why I Cant Wait To Go Back To Tower
Month Avg. Low Avg. High Record Low Record High
January -24oC -10oC -49oC 11oC
February -21oC -6oC -51oC 21oC
March -13oC 2oC -41oC 24oC