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TT Alignment. A. Chukanov, Yu. Gornushkin, S. Zemskova. LNGS, 27 th of April 2007. Dubna’s group activity. Muon track reconstruction ( TT alignment, brick finding) TT alignment Measurement of TT efficiency Study of PMT pedestals stability

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Tt alignment

TT Alignment

A. Chukanov, Yu. Gornushkin,

S. Zemskova

LNGS, 27th of April 2007


Dubna s group activity
Dubna’s group activity

  • Muon track reconstruction (TT alignment, brick finding)

  • TT alignment

  • Measurement of TT efficiency

  • Study of PMT pedestals stability

  • TODO study of PMT signals stability (gains)


Tt alignment with the help of muon tracks
TT Alignment with the help of muon tracks

3D Muon track

Distances

Hits

Main goal – minimization of all distances for all tracks

distances

D vs Y


3 dimension transformation
3 dimension transformation

  • 3 angles – around X, Y and Z axises

  • Shifting along Z-axis (beam line)

  • Shifting along X-axis

  • Non-linearity along strips

X

Z (beam)

Y (strip)


Hits corrections in module
Hits corrections in module

  • Reweghting of muon angle distribution

  • Reweghting of X and Y muon hits distribution

XZ angle

YZ angle


Rotation around beam line
Rotation around beam line

beam

Strips

dXa, cm


Rotation around strip line
Rotation around strip line

Strip

dZa, cm

beam



Strips non linearity
Strips non-linearity

Strip

h, cm

beam


Strips non linearity1
Strips non-linearity

dYv, cm

Strip

beam


Strips non linearity2
Strips non-linearity

Strip

dZ, cm

beam



Conclusion
Conclusion

  • Preliminary TT alignment has been made

  • Relative parameters was obtained

  • Cross-checks and tests are needed

  • Absolute measurements are needed (bricks and TT position)

  • Necessary to measure relative position of TT, DT and RPC


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