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MC of CBM Silicon Tracker Status Report. Valeri Saveliev Obninsk State University, Russia 10.05.2004 GSI, Darmstadt. CBM Spectrometer and Silicon Tracker (STS). STS: Station z Rmin Rmax [cm] [cm] [cm] 1 5 0.5 2.5 2 10 0.5 5.0 3 20 1.0 10.0 4 30 1.5 15.0 5 40 2.0 20.0

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Mc of cbm silicon tracker status report

MC of CBM Silicon TrackerStatus Report

Valeri Saveliev

Obninsk State University, Russia

10.05.2004

GSI, Darmstadt

V.Saveliev


CBM Spectrometer and Silicon Tracker (STS)

STS:

Station z Rmin Rmax

[cm] [cm] [cm]

1 5 0.5 2.5

2 10 0.5 5.0

3 20 1.0 10.0

4 30 1.5 15.0

5 40 2.0 20.0

6 80 4.0 40.0

7 100 5.0 50.0

Run Conditions: BX 10 MHz

  • STS:

  • Momentum measurement (Mag. Field);

  • Primary Vertex Reconstruction;

  • Secondary Vertex Recionstruction;

V.Saveliev


MC of CBM Si Tracker

Moscow State University – Si Technology and Production,

Moscow Engineering and Physics Institute (University): Front-End Electronics;

Obninsk State University: MC and Analysis;

St. Petersburg KRI, SKBM: Support Design and Construction.

Monte Carlo:

Obninsk State University:

V.Saveliev, PhD student D.Rizjikov, A.Golovin, Student O.Stotski

St. Petersburg :

V.Kondratiev

V.Saveliev


Monte Carlo of CBM Silicon Tracker

  • VMC CBM Simulation Framework – is Good Step for Starting.

  • Simulation Environment for STS:

  • Accounts and Connections to GSI is established from Obninsk and St. Petersburg;

  • Local Version of CBM VMC has been installed in Obninsk Uni on Linux Cluster ( CPU time is ~10 Min for full simulation of Au+Au event 25 AGeV );

V.Saveliev


Mc of cbm
MC of CBM

G4 version of VMC CBM

Central Au+Au at 25 AGeV

V.Saveliev


Mc of sts cbm
MC of STS CBM

Event 1,

Proj. (197,79), Targ (179,79), E= 25 GeV/u,

Track 1641 / 1641

STS detector sts_station_1: 505 Hits

STS detector sts_station_2: 677 Hits

STS detector sts_station_3: 706 Hits

STS detector sts_station_4: 721 Hits

STS detector sts_station_5: 720 Hits

STS detector sts_station_6: 706 Hits

STS detector sts_station_7: 699 Hits

V.Saveliev


Si strip sensors with stereo angles
Si-Strip Sensors with Stereo Angles

Simplest solution for technology:

Double Side Si Strip Detectors with

Stereo angles on single wafer

Implemented in G4 CBM Geometry

V.Saveliev


STS Sensors versions: Rf

Implemented in G4 CBM Geometry

V.Saveliev


STS Sensors versions LL

Long Ladder Si Strip Detectors (Si LC Project)

V.Saveliev


Occupancy of Silicon Tracker

Hits density (central Au+Au at 25 AGeV) in STS

V.Saveliev


Segmentation of Silicon Strip Tracker

Occupancy 1%; 5%

-------------------------------------------------------------

Strip Pitch 25 mm; 12.5 mm

-------------------------------------------------------------

Strip Length 0.4 mm 4 mm

Analysis in progress

Hits density of Station1 of STS

(central Au+Au at 25 AGeV)

V.Saveliev


Thickness of Si-Strip Tracker Sensors

Multiple Scattering is limitations:

Study is in progress:

Thickness of Si Sensors is in the range 100 – 300 mkm

V.Saveliev



Radiation Environment ?

GaAs:Cr for HEP - radiation testsYu Arestov (IHEP)

IHEP, Protvino

NCPHEP, Minsk

SIPT, Tomsk

ICBP, Puschino

V.Saveliev


Doping gaas by chromium the 5 year practice of a new technology in tomsk
Doping GaAs by Chromiumthe 5-year practice of a new technology in Tomsk

  • World studies of GaAs irradiation tolerance related mainly to GaAs structures of the previous generation.

  • A new unique production technology of GaAs:Cr (doped by Chromium) belongs to Tomsk.

  • As was earlier shown by estimates and by the first measurements (Protvino, RAL), GaAs:Cr radiation hardness can be higher than that of Si by a factor of 10 or larger.

V.Saveliev


More Detailed Analysis of STS Station3:

St Petersburg V.Kondratiev

V.Saveliev


More Detailed Analysis of Station3:

St Petersburg V.Kondratiev

V.Saveliev


Next Steps:

The Tool for Monte Carlo Simulation is exist

  • Position Resolution of Si Strip Detectors and Segmentation fits to CBM Requirements.

  • Geometrical Layout of Si-Strip Stations of STS.

  • Support Design and Implementation.

  • Radiation Environment Analysis.

  • Hits Structure,

  • Digitalization,

  • Connection to the Reconstruction Chain,

  • Optimization of Si-Strip Station of STS for the physics of CBM Open Charm and Low Mass Vector Mesons.

V.Saveliev


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