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