dmitri ossetski obninsk state university department of applied mathematics e-mail:...
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Dmitri OssetskiObninsk State UniversityDepartment of Applied Mathematicse-mail: [email protected]
D. Ossetski, Obninsk State University
Compressed Baryonic Matter
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The Setup Consist of:
•Target & Beam,•Superconducting Dipole Magnet,•Silicon Tracking System (STS),•Rich Imaging Cherenkov Detector (RICH),•Transition Radiation Detectors (TRD),•Resistive Plate Chamber (RPC),•Electromagnetic Calorimeter (ECAL),•HADES spectrometer.
Sketch of the planned CBM experiment
D. Ossetski, Obninsk State University
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The layout of the Si-Strip STS4 and STS6 Planes
Feature Value/Quantity
Angular coverage 50 to 500 mrad
Number of super layers
4
Detector modules per plane
28-60
Detector thickness ≤ 100-150 µm
Sensitive detector area
20x20 cm2 to 50x50 cm2
Operational temperature
≤40°C
Strip pitch 25 µm
Summary of Si-Strip STS
Si-Strip sensors are oriented radially.
D. Ossetski, Obninsk State University
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)1( nnN fake n - number of real hits
real hitsfake hits
Total
Points
Fake Hits
2nNNN fakerealall
Real Hits
D. Ossetski, Obninsk State University
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12s
x
p
)(12
8.02
tg
psy
sp - pitch of Si-Strip sensors
- stereo angle
mps 25
15my 46
mx 2.7
xy
CBM
x
y
yx
D. Ossetski, Obninsk State University
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Principal idea
Getting Hits. 3D "projection" of MCPoint on Si-Strip grid.
D. Ossetski, Obninsk State University
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Find hits (real and fake)
corresponding to active intersecting
strips
Find all strips activated by points
for every event
real hitsfake hits
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FOR EACH EVENT
WITH ARRAY OF ACTIVE STRIPS 1. Find place of intersection of pair of Strips 2. Generate Hit on that place 3. Save Hit info fX, fY, fDx, fDy
FOR EACH POINT 1. If it belongs to Si-Strip STS 2. Find current Si-Strip plate 3. Find current wafer 4. Find nearest to the Point vertical & inclined strips 5. Save active strips info to Array
Find Strips
Find Hits
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Point distribution for 1 event at 4 Si-Strip STS super layers
cm cm
cm cm
cm
cm
cm
cm
Z=40 cm Z=60 cm
Z=80 cm Z=100 cm
Simulation based on GEANT4 within the CBM virtual Monte Carlo framework were performed in order to optimize the layout of the Si-Strip tracker.
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Hit distribution for 1 event at 4 Si-Strip STS super layers
Z=40 cm Z=60 cm
Z=80 cm Z=100 cm
cm cm
cm cm
cm
cm
cm
cm
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Charged particles occupancy in Si-Strip STS central region 20 x 20 cm, 4 stations, 100 events
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1 cm of central parts along X
Charged particles occupancy in the four Si-Strip planes as function of the horizontal distance from the beam centre
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1 cm of central parts along X
Charged particles occupancy in the Si-Strip STS4 and STS7 as function of the horizontal distance from the beam centre
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DeltaX, DeltaY between points & real heats in STS4 inner wafer
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DeltaX, DeltaY between points & real heats in STS4 inner wafer
D. Ossetski, Obninsk State University
1. Continue working on Si-Strip STS tracker
2. Going to install CBM VMC software at Obninsk University