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Gamma-ray Large Area Space Telescope

Gamma-ray Large Area Space Telescope. Associating CalMip and Track Variables. Stefano Germani Monica Pepe INFN Perugia. Instrument Analysis Meeting December 16, 2005. Outlook. The second part of the study concerns Mip reconstructed directions consistency check

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Gamma-ray Large Area Space Telescope

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  1. Gamma-ray Large Area Space Telescope Associating CalMip and Track Variables Stefano Germani Monica Pepe INFN Perugia Instrument Analysis Meeting December 16, 2005

  2. Outlook • The second part of the study concerns Mip reconstructed directions • consistency check • correlation with the Mip segment length • comparison to the Track directions All plots refer to following cuts • TkrNumTracks = 1 • CalMipNum > 0

  3. CalMip Position TkrNumTracks=1 CalMipNum > 0 On Axis Events VtxZDir<-0.9 (25.8 deg) All 1 Track Events CalMip1Pos(Y) CalMip1Pos(Y) CalMip1Pos(X) CalMip1Pos(X) On Axis events have more homogeneous CalMip1Pos distribution

  4. Mip direction and segment length CalMip1Dir(Z) TkrNumTracks=1 CalMipNum > 0 Try to understand the meaning of second peak in the next slides CalMip1ArcLen Cal thickness ~160 mm (8×1Layer = 8×20 mm) CAL thickness At least 3 layers mm

  5. CalMip1Dir(Z) vs CalMip1ArcLen(I) TkrNumTracks=1 CalMipNum > 0 • Mip Finder requires: • XtalEnergy > 8 MeV • NLayers >= 3 CalMip1Dir(Z) CalMip1ArcLen(mm) The plot structure reflects the number of CAL layers crossed by the MIP (see next slide)

  6. CalMip1Dir(Z) vs CalMip1ArcLen(II) TkrNumTracks=1 CalMipNum > 0 Energy deposition > 8 MeV in 8 Layers MIP • Mip Finder requires: • XtalEnergy > 8 MeV • NLayers >= 3 mm MIP Energy deposition > 8 MeV in only 6 Layers mm

  7. Investigating long Mip segments TkrNumTracks=1 CalMipNum > 0 Energy deposition > 8 MeV in Layers 07 All Events CalMip1Dir(z) -.88 <CalMip1Dir/z) <- .78 28° 39° CalMip1Dir(z) > -.78 Selected Region CalMip1ArcLen (mm) All Events CalMip1ArcLen (mm) 0° 28° 39° We understand correlation between Mip direction and arc length but Why so many “green” MIPs? CalMip1Dir(z)

  8. Look at MIP segment direction TkrNumTracks=1 CalMipNum > 0 CalMip1Dir(X) CalMip1Dir(Y) vs CalMip1Dir(X) CalMip1Dir(Y) On Axis Tracks CalMip1Dir(Z) second peak Fred please cross check!

  9. Correlating CAL and Track CAL: CalMip1Dir(X,Y,Z) Track: Vtx(X,Y,Z)Dir TkrNumTracks=1 CalMipNum > 0 X Dir Z Dir CAL CAL Track Y Dir Track CAL MIP finder well correlated to reconstructed track but………. Track

  10. VtxZDir Tkr1EndDir(2) CalMip1Dir vs Tkr1EndDir CAL: CalMip1Dir(X,Y,Z) Track: Tkr1EndDir(X,Y,Z) X Dir CAL Track Z Dir CAL Beware of different orientation for initial (Vtx) and final (Tkr) Track direction Track

  11. Conclusions • Mip direction is well correlated to Track direction as expected • We have still to understand better the peaks in the Mip Direction distributions (X,Y,Z) • maybe they reflect the Cal Layer geometry ?

  12. Summary of CalMip SVAC variables We are waiting for real data!! • Analyzed • CalMipNum • CalMipnPos(3) n=1,2 • CalMipnDir(3) • CalMipnChi2 • CalMipnArcLen • CalMipnEcor • CalMipnErm • Not yet checked • CalMipnD2edge • CalMipnEcorRms Thanks Frederic for useful explanations !!

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