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SSD beamtest analysis St éphane Plumeri Institut de Recherches Subatomiques (IReS), Strasbourg. ITS week 20 – 23 October 2003. ALICE collaboration. Outlook. StripTracking software Noise, pedestal and common mode shift Signal and signal to noise ratio Cluster shape Charge matching

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ssd beamtest analysis st phane plumeri institut de recherches subatomiques ires strasbourg

SSD beamtest analysisStéphane Plumeri Institut de Recherches Subatomiques (IReS), Strasbourg

ITS week 20 – 23 October 2003

ALICE collaboration

outlook
Outlook
  • StripTracking software
  • Noise, pedestal and common mode shift
  • Signal and signal to noise ratio
  • Cluster shape
  • Charge matching
  • Conclusion

S.Plumeri (IReS) - ITS week

striptracking software
StripTracking software

Authored by Dirk Meier at CERN (1997)

and modified by J. Baudot, C. Suire and S.Plumeri (IReS)

for STAR and ALICE SSD beamtests.

StripTracking is a C++ program linked with root libraries

StripTracking can:

  • Measure noise and pedestal
  • Find hits
  • Correlate hits on each side

S.Plumeri (IReS) - ITS week

noise
Noise

ITC’s modules:

Module 3: 357 e- P side

573 e- N side

Module 4: 365 e- P side

573 e- N side

Canberra’s modules:

Module 1: 440 e- P side

1458 e- N side

Module 2: 415 e- P side

1369 e- N side

For each module V = 45V

S.Plumeri (IReS) - ITS week

pedestal
Pedestal

Pedestal = mean value of charge over the run

2100 – 2200 ADC counts for all modules

Nearly the same

for N and P side

S.Plumeri (IReS) - ITS week

common mode shift
Common mode shift

Standard deviation of cms distribution over events, with :

Seems to increase with distance from power supply

S.Plumeri (IReS) - ITS week

signal
Signal

Charge in clusters

(threshold: seed strip S/N>5 neighboors S/N>3 )

S.Plumeri (IReS) - ITS week

signal1
Signal

Charge in clusters

(Correlation between two sides and geometrical cut)

S.Plumeri (IReS) - ITS week

signal to noise ratio
Signal to noise ratio

Problem on canberra’s module N side

S.Plumeri (IReS) - ITS week

cluster shape
Cluster shape

Bad results on canberra’s N side

S.Plumeri (IReS) - ITS week

charge matching
Charge matching

Default on ITC’s module: maybe due to noisy strips ?

S.Plumeri (IReS) - ITS week

conclusion
Conclusion

Good modules performances

But:

  • Origin of high cms?
  • Too much noise on N side of canberra’s module

Next step: Tracking

S.Plumeri (IReS) - ITS week

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