Mini Tower Preliminary Results
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![Page 1: Mini Tower Preliminary Results](https://reader036.fdocuments.in/reader036/viewer/2022062721/56813698550346895d9e2a0c/html5/thumbnails/1.jpg)
Mini Tower Preliminary Results
Xin Chen and Eduardo do Couto e Silva
July 14 , 2003
Ground Software Workshop
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Minitower Test
• All results are PRELIMINARY
• These data are not intended for MC validation but to debug the data analysis chain and to study the experimental set-up
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The Minitower GeometryLAT-TD-00582-02
Maintained by X. Chen
3% W
There are 8 layers instrumented with Front-End Electronics (MCMs) but only 6 layers instrumented with silicon detectors
Y3X3
X2Y2
Y1X1
X0Y0
no silicon detectors
V3V3
V3V3
V3V3
V5V5
no silicon detectors
FG
GG
FF
GTFE Si layer GTRC
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Data Taking Configurations
minitower
min
itower 17.6 MeV
Cosmic Rays Cosmic Rays
Vertical position Expected CR trigger rate 13 Hz
Horizontal position Expected CR trigger rate ~ 4 HzExpected trigger rate ~ 0.02 Hz
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The Experimental Setup
Cosmic raytelescope
minitower
BGO crystals
VDG beam pipe
EGSE(VME crate)
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The Coordinate System
Y
X
Z
Based on position of disabled or
dead channels in every layer, this region (~1/8 of
minitower active area) is expected
to have the highest trigger
efficiency
Position VDG pipe at negative X and Y coordinates
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Event rates – TKR trigger
Run ID Run type DATA
Trigger rate
(Hz)
MC
Trigger rate
(Hz)
DATA
Reconstructed rate
(Hz)
MC Reconstructed
rate
(Hz)
030613022805 Muons with vertical tracker
~ 0.94 ~ 0.83 ~0.88 ~ 0.74
030604013515 Muons with horizontal
tracker
~ 0.42 ~ 0.38 ~ 0.36 ~ 0.33
There is reasonable agreement between MC and DATA since we assume about 20% uncertainty in the MC rates due to the knowledge of the flux.
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Strip MapY layers X layers
This layer with about 300 “live” strips, strongly
constraints the parameter space available for triggering
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Muons with vertical tracker – TKR trigger only
Hit Multiplicity
MC
DATA
Normalized rates in Hz
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MC
DATA
Muons with vertical tracker – TKR trigger onlyTOT in each layer Normalized rates in Hz
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Muons with vertical tracker – TKR trigger only
Track multiplicityNormalized rates in Hz
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MC DATA
X
Y
Z
X
Y
Z
Muons with vertical trackerReconstructed direction
Dead Channel list from DATA is used
as input for MC
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MC DATA
X
Y
Z
X
Y
Z
Muons with vertical trackerReconstructed direction
Dead Channel list from DATA is used
as input for MC
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Muons with horizontal trackerMC DATA
X
Y
Z
X
Y
Z
Reconstructed direction
Dead Channel list from DATA is used
as input for MC
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MC DATA
X
Y
Z
X
Y
Z
Muons with horizontal trackerReconstructed Position
Dead Channel list from DATA is used
as input for MC
X
Z
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x
z proton
P + Li ---> Be ---> Be + gamma ( 66% 17.6 MeV, 33% 14.6 MeV )
Pb shield
Li target
Mini tower
VDG DATA Taking Mode
photons
MC Simulation
Experiment
Only the Pb shield is implemented in the simulation
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MC (photons only) DATA (photons + muons)
X
Y
Z
X
Y
Z
Photons + Muons with horizontal trackerReconstructed Direction
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X
Y
Z
X
Y
Z
MC (photons only) DATA (photons + muons)
Photons + Muons with horizontal trackerReconstructed Position
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VDG CalibrationMinitower : ebf0306040204959 46002 events 8158 s Rate 5.6 HzBGO crystals : VG13.dat 46907 events 6160 s Rate 7.6 Hz
calculated spectrum
measured spectrum with BGO crystals
Energy (MeV)
Used the BGO and estimate the photon rate in
the minitower to be 5.7 Hz ± 30%
(preliminary)
cosmics
G. Godfrey
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Signal + Background (1)
VDG signal + C.R. background
Cosmic ray background
~ 2 hours of data taking Trigger rate
VDG + C.R. ~ 5.6 Hz
C.R. ~ 0.5 Hz
58% of triggered signal + background events were reconstructed81% of triggered cosmic ray background events were reconstructed
The VDG provides valuable DATA to study reconstruction efficiencies of photons
We understand the coordinate system of our set-up since both X and Y reconstructed positions are negative
(mm) (mm)
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VDG signal + C.R. background
Cosmic ray background
Y
Z
Photons impinging on top face of minitower
cos()
Signal + Background (2)
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Reconstructed photon direction
Top of minitower
Top of minitower
Y Z View
X Z View
Photon candidate
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Plans
• Continue to look at these data until the next hardware (TKR+CAL) is delivered (mid to end of August)– Analyzing the TKR data at different detector
thresholds – Studying possible time effects
• The focus now is to develop all the online and offline infrastructure necessary for the next mini tower tests