Read out data analysis of the mvd demonstrator
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Read out & data analysis of the MVD demonstrator. S. Amar-Youcef , M. Deveaux, I. Fröhlich, J. Michel, C. Müntz, C. Schrader, S. Seddiki, T. Tischler, and J. Stroth. Outline. Goals Read out & data analysis software First measurements Test of data consistency

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Read out & data analysis of the MVD demonstrator

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Read out data analysis of the mvd demonstrator

Read out & data analysis of the MVD demonstrator

S. Amar-Youcef, M. Deveaux, I. Fröhlich, J. Michel, C. Müntz, C. Schrader, S. Seddiki, T. Tischler, and J. Stroth


Outline

Outline

  • Goals

  • Read out & data analysis software

  • First measurements

    • Test of data consistency

    • Quality of the analog readout chain

  • Summary

13th CBM Collaboration Meeting


Goals of the software

Goals of the software

  • Validation of the demonstrator

  • Build C++ platform to test data sparsification algorithms and to compare with FPGA-implementation.

  • Interfacing the demonstrator with CBM-Root and the Strasbourg pixel telescope

  • Option to interface this algorithm with the CBMRoot digitizer to test it in simulation

13th CBM Collaboration Meeting


Data acquisition demonstrator analysis software das

GEANT+

MVD Digitizer

AD conversion

Strasbourg pixel

beam telescope

Raw data transfer

(Mode 0)

FPGA data sparsification

(Mode 1)

Digitizer data

sparsification

HDD

Reader +

Offline data sparsification

Reader

Reader

Analog/Digital cluster finder

Dedicated analysis,

validation, radhardness, …

CBMRoot interface

MVD-clusters or MVD-hits

Data acquisition & Demonstrator Analysis Software (DAS)

MIMOSA - chip

HDD

13th CBM Collaboration Meeting


Status

GEANT+

MVD Digitizer

Strasbourg pixel

beam telescope

FPGA data sparsification

(Mode 1)

Digitizer data

sparsification

Reader

Reader

CBMRoot interface

MVD-clusters or MVD-hits

Status

MIMOSA - chip

AD conversion

Raw data transfer

(Mode 0)

HDD

HDD

Reader +

Offline data sparsification

Analogcluster finder

Analog/Digital cluster finder

Dedicated analysis,

validation, radhardness, …

13th CBM Collaboration Meeting


First usecase of the das

MAPS add-on board

Demo-AUX

analogue output

sync. signals

Mi20 board

(Previously tested with Strasbourg reference system)

Trb2

(TRBnet)‏

or

data transfer: I/O-card

data transfer: OP-link

monitoring

Test-setup

File Server

First usecase of the DAS

Validation of analog readout chain of the demonstrator

13th CBM Collaboration Meeting


Test of data consistency

Test of data consistency

  • Constant pixel sequence in frames,

    Since data is rearranged

Frame 0

Frame 1

Signal (ADC units)

Signal (ADC units)

column

row

column

row

Any shift in pixel order reflect the dynamic range!

If correctly arranged: CDS eliminates the dynamic range.

13th CBM Collaboration Meeting


Performing cds

Performing CDS

Frame 0

Frame 1

CDS

Signal (ADC units)

Tested for several 1000

consecutive frames

=> OK

column

row

13th CBM Collaboration Meeting


Test of data consistency1

Test of data consistency

  • Hit distribution reproduces illumination spot by 55Fe-source

Picture of the collimator of the Fe55-source

Order of pixels seems to be OK!

13th CBM Collaboration Meeting


Quality of the analog readout chain

Quality of the analog readout chain

  • Significant parameters

    • Particle detection ability

    • Gain

    • Noise

13th CBM Collaboration Meeting


Particle detection ability

Particle detection ability

Cluster-building for charge spectrum (55Fe-source)

  • Significant hits (amplitude > 5*noise) → seed candidate

  • Test seed candidates: no adjacent pixel with larger amplitude

  • Seed found: take all adjacent pixels to build cluster

Diode Hits

Entries

Margin Hits

Hit-Cluster

As expected from reference system => OK

CDS-Signal (ADC)

13th CBM Collaboration Meeting


Gain test

Gain test

  • Using photons from 55Fe-source for ADC calibration

Gain = 6e/ADC

Small, irrelevant variation

with respect to reference system

(Expected K-Peaks at 400ADC)

=> OK

Entries

Margin Hits

CDS-Signal (ADC)

13th CBM Collaboration Meeting


Noise measurement

Noise measurement

Noise: RMS of the fluctuations of the pixels over time

F0-F1

RMS of

Individual pixels

Signal (ADC units)

row

column

Mean noise = 33e => Expected 25e

Origin of additional noise was identified (preliminary analog cable).

Building an dedicated cable is in progress, expect results within two weeks.

13th CBM Collaboration Meeting


Summary

Summary

  • The Demonstrator Analysis Software (DAS) is a software to analyse the data of the MVD-demonstrator within CBMRoot.

  • It will allow to test the same data sparsification algorithms with real data and simulated data.

  • It will interface the MVD + the Strasbourg pixel telescope with CBMRoot

  • DAS was used to validate the FPGA-board of the MVD-demonstrator using a tested MIMOSA-20 chip.

  • The data consistency of the FPGA-board was confirmed.

  • The hit finding ability of the FPGA-board was confirmed.

  • The source of a small additional noise with respect to the slower reference system was identified and will be fixed within the next weeks.

  • The tests performed confirm the validity of the design of the FPGA-Board

13th CBM Collaboration Meeting


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