Anna Kotynia.  8 stations  fully based on micro-strip detectors Tracking detector: -low-mass detector -full azimuthal angle coverage -polar angle coverage:from.

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Presentation transcript:

Anna Kotynia

 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

-> 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 high Different z-position of each sensor;

7,5° front stereo angle & -7,5° back stereo angle

Hit Finding Efficiency

Hit density Strip occupancy

all — all tracks, that are in acceptance. 8 sens — there were no gap and no overlap. 7 sens — there was 1 gap 6 sens — 2 gaps 9 sens — 1 overlap 10 sens — 2 overlaps 1 gap, 1 overlap — it is easy to understand

 Signal  Signal:  80e-/  m  (24000e- for 300  m silicon)  Noise  Noise:  0.8 pF/cm in cables  ~1.5 pF/cm in sensors n-XYTER n-XYTER: fast: 26.9e/pF+200e slow: 12.7e/pF+233e EXAMPLE EXAMPLE: 2cm sensor+30cm cable=>926e/576e 16cm sensor+ 3cm cable=>911e/569e ADC signal on front strips ADC signal on back strips

Cluster width all 1 channel 2 channels 3 channels 4 channels 5 channels >5 channels Signal peak height [a.u.~1ke-] Gaus Noise 8

Distance from the y-axis to the outer regions of station Θ distribution in Au+Au central 25AGeV

Software download source:  svn co  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