MINERvA CalorimetryCalibration with infinite detector

Jaewon Park

University of Rochester

Jupiter/MINERvA Group Meeting, Nov 15, 2006

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Infinite ID gap dependence

Angle: 0deg (perpendicular to detector) Gap difference gives ~1% contribution

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Infinite DS-HCAL

No gapsProton beam energy: 1, 1.5, … 5GeVAngle: 0, 10, … 60deg

0deg means perpendicular to DS-HCAL

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Infinite DS-HCAL

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Infinite OD

With gapsIron width: 3, 5, 7, 10cmProton beam energy: 1, 1.5, … 5GeVAngle: 30, 40, … 80deg

90deg means perpendicular to OD

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Infinite OD (3cm iron)

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Infinite OD (5cm iron)

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Infinite OD (7cm iron)

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Infinite OD (10cm iron)

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Infinite OD (summary)

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Summary Calibration constants are calculated for ID, DS-HCA

L, OD ID

Gap dependence Average over beam energy

DS-HCAL Average over beam energy and angle(0 to 50deg)

OD Iron width dependence Average over beam energy and angle(30 to 80deg)

Next step is to test those calibration constants with composite detectors (ID+DSHCAL and ID+OD)

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ID + infinite DS-HCAL

No gaps in ID and DS-HCAL Angle: 0deg (perpendicular to detector) Proton beam energy: 1, 1.5, … 5GeV ID track length: 476, 376, 276, 176, 76, 26cm

~2% deviation from beam energy

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ID + infinite OD

With gaps in ID and OD4 types of ID+OD: iron width=3, 5, 7, 10cmProton beam energy: 1, 1.5, … 5GeVAngle = 50deg

This is middle point of previous calibration(30 to 80deg)

ID track length: -100, -80, -40, 0, 40, 80, 100cm from center

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ID+Infinite OD

Iron width: 3cm

Iron width: 5cm

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ID+Infinite OD

Iron width: 7cm

Iron width: 10cm

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ID+Infinite OD (summary)

Calibration doesn’t work very well

~5-10% lesser than beam energy

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Calibration without back-scattered particles

When ID track length=0, it should be 1 Back-scattered particle can’t contribute DS-HCAL for composi

te detector

When ID track length is large, it’s ID only geometry

Two end point should be 1 With new calibration for DS-HCAL

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Calibration without back-scattered particles

It doesn’t help very much for OD

With new calibration for OD

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Next try

I don’t want change ID calibration Relative OD calibration doesn’t help It would be best to make flat in the central region a

nd to scale (ID+OD)

5cm OD

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Another try

First of all, I used different OD calibrations for 5, 7, 10cm OD to make close to 3cm OD curve

Then, scale (ID+OD) to make it near 1 Scale factor was 1.03 I hope to use same ID calibration for DS-HCAL and OD

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Summary

Individual calibration didn’t work very well for ID+OD.

It seems best to calibrating with combined detector which requires constant total energy over different ID track length.

Next step is leakage study