Silicon strip layout
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Silicon strip layout
T.Galatyuk
CBM collaboration meeting, GSI, October 6–8 2004
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Outline
• Design of micro strip silicon planes
• Characteristics of strip layout
• Digitization of the hits in the STS
T.Galatyuk October 6-8 2004 CBM collaboration meeting 2
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Strip length calculation
Occupancy < 1%
Pitch = 50 m
T.Galatyuk October 6-8 2004 CBM collaboration meeting 3
Central Au+Au collision at 25 AGeV
x coordinate distribution in 3-d STS station
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3-d STS station [ 20 cm ]
Region boundary [cm] Strip length [cm]
Phi_nr Phi_nphi R_nr R_nphi Phi_tot R_tot Phi_tot+R_tot Tot N strip
1.1 1.4 0.1 3 1382 60 88 4147 5278 9425 265527
1.4 2.8 0.2 7 1759 280 88 12315 24630 36945 (14000)
2.8 6.0 0.4 8 3519 640 94 28149 60319 88467 {840000}
6.0 10.0 1.0 4 7540 800 126 30159 100531 130690
4-th STS station [ 40 cm ]
2.1 2.8 0.35 2 2639 140 50 5265 7020 12284 303792
2.8 5.6 0.7 4 3519 560 50 14064 28128 42191 (53000)
5.6 12.0 1.6 4 7037 1280 47 28149 60319 88467 {840000}
12.0 20.0 2.0 2 15080 1600 63 60319 100531 160850
5-th STS station [ 60 cm ]
3.1 4.0 0.45 2 3896 180 56 7801 10066 17867 414964
4.0 8.0 1.0 4 5027 800 50 20106 40212 60319
8.0 20.0 2.0 6 10053 2400 63 60319 150796 211115
20.0 30.0 5.0 2 25133 2000 38 50265 75398 125664
6-th STS station [ 80 cm ]
4.1 5.6 1.5 1 5152 300 23 5139 7020 12159 457982
5.6 11.6 2.0 3 7037 1200 36 21112 43731 64842 (500000)
11.6 20.0 4.2 2 14577 1680 30 29142 50245 79388
20.0 40.0 5.0 4 25133 4000 50 100531 201062 301593
7-th STS station [ 100 cm ]
5.1 7.0 1.9 1 6409 380 23 6393 8774 15167 642229
7.0 15.0 4.0 2 8796 1600 24 17593 37699 55292 (782000)
15.0 30.0 5.0 3 18850 3000 38 56549 113097 169646
30.0 50.0 5.0 4 37699 4000 63 150796 251327 402124
Total number of strip in 3 7 STS = 2.084E+06
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First layer of strips Second layer of strips
r
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Occupancy
T.Galatyuk October 6-8 2004 CBM collaboration meeting 6
Occupancy for = 0o
first layer second layer
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T.Galatyuk October 6-8 2004 CBM collaboration meeting 7
Implementation of resolution
1. The total charge per hit is smeared Gaussian-like over the hitted strip and its next and second next neighbors
2. A noise (poissonian with constant mean for each strip) is added
3. Having the charge in each strip, the center of mass is determined as the hit position
Charge per strip
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Resolution
T.Galatyuk October 6-8 2004 CBM collaboration meeting 8
dependence
Dependence ch on noise
ch = 15.24 mch = 15.19 m
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Digitization result
number of zone
num
ber
of h
its
3-d STS 4-th STS 5-th STS
6-th STS 7-th STS
T.Galatyuk October 6-8 2004 CBM collaboration meeting 9
MC hits (points)
reconstructed hits
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Total number of strip
265527 398876
0.1 0.1
0.2 0.14
0.4 0.2
1.0 0.5
Strip length in3-d STS station
[cm]
T.Galatyuk October 6-8 2004 CBM collaboration meeting 10
Possible way to decrease the number of hitsDecrease the strip length
3-d STS