sts simulations
Post on 02-Jan-2016
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STS SIMULATIONSAnna Kotynia
STS DETECTOR
8 stations fully based
on micro-strip detectors
Tracking detector:-low-mass detector-full azimuthal angle coverage-polar angle coverage:from 2.5°to 25°-high track density in the inner-most region-high collision rate-vertical magnetic field
SECTORS & MODULES
-> Outer regions covered by larger sensors, or even chained sensors (1÷3 sensors in one sector), to minimize number of channels -> Small sensors in the inner region to reduce the occupancy;
Sensors:● 300μm thick,● 6cm wide ,● 2÷6 cm highDifferent z-position of each sensor;
STRIPS
7,5° front stereo angle& -7,5° back stereo angle
RESULTS
Hit Finding Efficiency
RESULTS C.D.
Hit densityStrip occupancy
all — all tracks, that are in acceptance.8 sens — there were no gap and no overlap.7 sens — there was 1 gap6 sens — 2 gaps9 sens — 1 overlap10 sens — 2 overlaps1 gap, 1 overlap — it is easy to understand
NOISE CALCULATIONS
Signal: 80e-/mm
(24000e- for 300mm silicon)
Noise: 0.8 pF/cm in cables ~1.5 pF/cm in sensors
n-XYTER:fast: 26.9e/pF+200eslow: 12.7e/pF+233e
EXAMPLE:2cm sensor+30cm cable=>926e/576e
16cm sensor+ 3cm cable=>911e/569e
ADC signal on front stripsADC signal on back strips
DETECTOR RESPONCE Cluster widthall1 channel2 channels3 channels4 channels5 channels>5 channels
Signal peak height [a.u.~1ke-]
Gaus NoiseThreshold @ 8
Distance from the y-axis to the outer regions of station
RESULTS Θ distribution in Au+Au central
collision @ 25AGeV
STS SOFTWARE STATUS
Software download source: svn co
https://subversions.gsi.de/fairroot/cbmroot/trunk Ideal reconstruction: sts_reco.C Real reconstruction: sts_reco_real.C
Geometry file: sts_Standard_s3055AAFK5.SecD.geo
Parameters file: sts_Standard_s3055AAFK5.SecD.digi.par
sts_Standard_s3055AAFK5.SecD.7vs7.digi.par
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