Gamma-ray Large Gamma-ray Large Area Space Area Space Telescope Telescope Understanding Understanding SVAC CalMip SVAC CalMip Variables Variables Monica Pepe Stefano Germani INFN Perugia Instrument Analysis Meeting December 16, 2005
Gamma-ray Large Area Space Telescope Understanding SVAC CalMip Variables Monica Pepe Stefano Germani INFN Perugia Instrument Analysis Meeting December.
Dec 16, 2015
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Gamma-ray Large Area Gamma-ray Large Area Space TelescopeSpace Telescope
Understanding Understanding SVAC CalMip VariablesSVAC CalMip Variables
Monica PepeStefano Germani
INFN Perugia
Instrument Analysis MeetingDecember 16, 2005
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 2
OutlookOutlook
• Aim of the work:– First look to the new CalMip variables in the
SVAC ntuple• Consistency check (Monica)• Direction and Correlation with tracks (Stefano)
• Data:– Surface Muons 1M Montecarlo
• SVAC Ntuple/nfs/farm/g/glast/u11/InstrumentAnalysis/MC/EngineeringModel-v5r0703p3/LAT_Surface_Muons/surface_muons_1M_svac.root
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 3
CalMipNumCalMipNum
All Events TkrNumTracks=1 Events
CalMipNum CalMipNum
Why zero Mips?
Why more than one Mip?
CalMipNum Event Fraction
0 42.9 %
1 52.4 %
2 4.6 %
3 0.03 %
4 8E-6
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 4
Why 1 Track and 0 Mip (Why 1 Track and 0 Mip (II) ?) ?
Tkr1NumHits Tkr1NumHits
1 Track and 0 Mip 1 Track and 1 Mip
The Track may not reach the CAL
as seen in next slides
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 5
Why 1 Track and 0 Mip (Why 1 Track and 0 Mip (IIII) ?) ?
Tkr1EndPos 0 Mip
Tkr1EndPos 1 Mip
Tkr1EndPos
No Mip found if track ends on LAT edge
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 6
Why 1 Track and 0 Mip (Why 1 Track and 0 Mip (IIIIII) ?) ?
Tkr1 Extrapolation to Cal: 0 Mip
Tkr1 Extrapolation to Cal: 1 Mip
Tkr1 Extrapolation at CAL entry
No Mip found if track extrapolation do not enter in CAL
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 7
Why 1 Track and >1 Mip ?Why 1 Track and >1 Mip ?
Mip Finder algorithm can find several Mip Track segments due to CAL segmentation and position resolution (Thanks Fred!)
CalMip2Pos(X) vs CalMip1Pos(X)
CalMip2Pos(Z) vs CalMip1Pos(Z)
CalMip2Pos(Y) vs CalMip1Pos(Y)
The two Mip segments belong to the same TRUE Mip (separated along Z: if Mip1 is at High Z Mip2 is at Low Z)
mm
mm
mm
mm
mm
mm
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 8
MIP EnergyMIP Energy
CalMip1Ecor
MeV
MeV
CalMip1Erm CalMip1Erm vs Mip Track Length
mm
MeV
CalMip1Ecor
is the mean vertical-equivalent energy averaging path length corrected energy on layer basis
CalMip1Erm
is the total energy in a cylinder of
1 Moliere radius (35 mm in CsI)
SVAC Instrument Analysis Meeting, December 16, 2005
Stefano Germani & Monica Pepe 9
ConclusionsConclusions
• CalMip Ntuple – variables seems to be correctly filled
• Mip Finder – behaves as expected when the muon track
reaches the CAL
– Multiple Mips associated to the same track are actually segments of the same MIP
• Would it be necessary to improve the algorithm in order to take into account these topologies?
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