1 / 10

Performance studies of the CBM Silicon Tracking System

Performance studies of the CBM Silicon Tracking System. Anna Kotynia Hic for Fair, F rankfurt U niversity. Silicon Tracking System in CBM experiment. The CBM experiment at FAIR will investigate the QCD phase diagram at high baryon densities

martena-galloway
Download Presentation

Performance studies of the CBM Silicon Tracking System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Performance studies of the CBM Silicon Tracking System Anna Kotynia Hic for Fair, Frankfurt University Anna Kotynia - Silicon Tracking System in CBM experiment

  2. Silicon Tracking System in CBM experiment The CBM experiment at FAIR will investigate the QCD phase diagram at high baryon densities The Silicon Tracking System is the central detector for track and momentumdetermination Dipol magnet Target MVD & STS Anna Kotynia - Silicon Tracking System in CBM experiment

  3. Silicon Tracking System • Chellanges: • 10 MHzinteractionrate • Up to 1000 chargedparticles per one Au+Au central collisionat 25 A GeV • Trackdensitiesup to 30 per cm2 • Conditions: • Highlygranular , low-mass and radiationharddetector system • Fast data acquisition system for onlineeventselection • Efficientchargedparticletracking and high momentum resolution Anna Kotynia - Silicon Tracking System in CBM experiment

  4. STS layout • 1024 strips per sensor; • 15° stereo angle; • 60 µm pitch strip. Outer regions covered by larger sensors, or even chained sensors (1-3 sensors in one module), to minimize number of channels Total area, 8 stations: 3.2 m2 Number of sensors: >1000 Number of r/o channels: 1.5M Number of FE chips: >12k • Sensors: • 300 µm thick; • 6 cm wide; • 2-6 cm high. Anna Kotynia - Silicon Tracking System in CBM experiment

  5. STS Digitizer • |B| = 1T • Holes: • = 1.5° Dx = 8mm Electrons • = 7.5° Dx = 40mm Complete chain of physical processes caused by charged particle traversing the detector Magnetic field influances collection of the charge on the strips Anna Kotynia - Silicon Tracking System in CBM experiment

  6. STS Digitizer Particle position in the sensor is obtain by using Center Of Gravity algorithm: • Random noiseisadded to the charge signal, according to a Gaussiandistributionwith standard deviationas an equivalentnoise charge of thedetector system Anna Kotynia - Silicon Tracking System in CBM experiment

  7. Hit FindingEfficiency Center Of Gravity method results in a strong dependence of the hit finding efficiency on the particle crossing angle Hit finding efficiency: 54-99% ~92% Anna Kotynia - Silicon Tracking System in CBM experiment

  8. Channel inefficiencies Single channel inefficiencies as a result of thereadoutelectronic’sdead time Dependence of channel dead time on pulse amplitude • Preliminary STS simulations results • Max channel occupancy is 14 times per 100 mbias events • Mostly it is 9~8 times per 100 mbias events • -> less then 1,25 us time distance between hits in one channel Anna Kotynia - Silicon Tracking System in CBM experiment

  9. Channel inefficiencies For minimum bias Au+Au collision at 25AGeV channel occupancy: Anna Kotynia - Silicon Tracking System in CBM experiment

  10. Summary • CBM requirements for the Silicon Tracking Systemcall for a highly granular, low-mass and radiation hard detector system; • The performance of the Silicon Tracking System has been evaluated with realistic detector responce functions inplemented; • As a result of implementation of all realistic functions, hit finding efficiency drops down by 2% for particles with incident angle below 20°. • Next Steps • Detailed studies of influence of noise level, ADC resolution and channel inefficiencies on full particles reconstruction; • Improvement of STS geometry in order to achieve more then 90% of particles with incident angle below 20°; • Comparision of simulations results with real date obtain from test experiments. Anna Kotynia - Silicon Tracking System in CBM experiment

More Related