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Silicon strip layout

CBM collaboration meeting, GSI, October 6–8 2004. Silicon strip layout. T.Galatyuk. T.Galatyuk October 6-8 2004 CBM collaboration meeting 2. Outline. Design of micro strip silicon planes Characteristics of strip layout Digitization of the hits in the STS.

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Silicon strip layout

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  1. CBM collaboration meeting, GSI, October 6–8 2004 Silicon strip layout T.Galatyuk

  2. T.Galatyuk October 6-8 2004 CBM collaboration meeting 2 Outline • Design of micro strip silicon planes • Characteristics of strip layout • Digitization of the hits in the STS

  3. T.Galatyuk October 6-8 2004 CBM collaboration meeting 3 Strip length calculation x coordinate distribution in 3-d STS station Central Au+Au collision at 25 AGeV Occupancy < 1% Pitch = 50 mm

  4. Total number of strip in 3 7 STS = 2.084E+06

  5. r First layer of strips Second layer of strips

  6. T.Galatyuk October 6-8 2004 CBM collaboration meeting 6 Occupancy Occupancy for  = 0o first layer second layer

  7. T.Galatyuk October 6-8 2004 CBM collaboration meeting 7 Implementation of resolution Charge per strip • The total charge per hit is smeared Gaussian-like over the hitted strip and its next and second next neighbors • A noise (poissonian with constant mean for each strip) is added • Having the charge in each strip, the center of mass is determined as the hit position

  8. ch = 15.19 mm ch = 15.24 mm T.Galatyuk October 6-8 2004 CBM collaboration meeting 8 Resolution • dependence • Dependence ch on noise

  9. MC hits (points) reconstructed hits T.Galatyuk October 6-8 2004 CBM collaboration meeting 9 Digitization result 3-d STS 5-th STS 4-th STS number of hits 7-th STS 6-th STS number of zone

  10. Total number of strip 265527 398876 T.Galatyuk October 6-8 2004 CBM collaboration meeting 10 • Possible way to decrease the number of hits Decrease the strip length 0.1 0.1 0.2 0.14 0.4 0.2 1.0 0.5 Strip length in 3-d STS station [cm] 3-d STS

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