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Test of the MAPS add-on board

Test of the MAPS add-on board. S. Amar-Youcef, M. Deveaux , D. Doering, C. Müntz , S. Seddiki , P. Scharrer, Ch . Schrader, J. Stroth , T. Tischler. Outline. Test setup Mi 20 – Sensor Data analysis Results: Test MAPS add-on board Summary.

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Test of the MAPS add-on board

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  1. Test of the MAPS add-on board S. Amar-Youcef, M. Deveaux, D. Doering, C. Müntz, S. Seddiki, P. Scharrer, Ch. Schrader, J. Stroth, T. Tischler

  2. Outline • Test setup • Mi 20 – Sensor • Data analysis • Results: Test MAPS add-on board • Summary

  3. Test setupOnlyacquisitionboardchanged in contrasttoreferencesystem Mimosa20 (2008) Sensor Auxiliary board, power supply, signal processing, data transfer Frontend board (PCB) Test HADES-DAQ compatible, no dead time, big RAM space for data storage or buffering, 50MHz readout clock; Data processing: digitalization, sparsification Analog signals Sync. signals MAPS add-on board on TRB2 (TRBnet) Data transfer: I/O card or OP-link Monitoring PC Analysis

  4. Mimosa 20 - Sensor • Mimosa20 (2008): • Differential analog output • 2 banks • 10 submatrices • Multiplexed onto 2 outputs • 50 MHz • 200 kPixels • 30 µm pixel-pitch • SB pixels Recharge diode Output 30 µm Cparasitic Collecting diode

  5. Properties SB-pixel Potential at output: Equilibrium: Irecharge =Ileakage Recharge diode Output Irecharge CDS (Correlated Double Sampling): Ileakage Noise Cparasitic Potentiometer Collecting diode

  6. Chip slowcontrol • JTAG interface for chip settings • Working point of source follower • Level marker pixels • Level of signals • Amplification • Analog buffer • Differential output buffer

  7. Data analysissoftware Data taken and stored! Data Data Data Import ROOT Demultiplexing Hit-signal (Pixels overthreshold) Clusterfinding CDS Noise

  8. Key observables: Kα (55Fe ) Gain Noise Histogramm Calibration [e-/ADC] Noise [e-] Noise in one Pixel Entries Pixel to pixel dispersion of Noise Noise [ADC] Charge spectrum of 55-Fe source Noise [ADC]

  9. Status on last collaborationmeeting • Goal: • Validatetheboard design • Check whetherwecanreachaspiredperformance • Maximizesensitivity ↔ minimizenoise • Understand MAPS add-on board in detail • Approach: • Systematicmeasurements • Optimizesettings Bachelor student: P. Scharrer • We could start running this setup for a first time • Readoutchain working properly • But performance of analoge electronics not clarified

  10. ResultsCalibration: gain (@ f=50MHz) Each data point measured with ‚optimal‘ settings! Discharge of Kα signal, due to higher recharge current at higher temperatures!

  11. SB-Pixel: Potential at output with hit: Irecharge < Ileakage + ISignal Irecharge = Ileakage Irecharge > Ileakage CDS: Hit-signal At higher leakage current: Pixel recharge faster Hit signal smaller

  12. Calibration: gain (@ f=50MHz) Expectedsaturationvalue: 408 ADC = 1640 e-

  13. Noise w.r.t. chip temperature:

  14. Noise w.r.t. readout frequency: Resonant regionof MAPS add-on boards Conclusion: properties are comparable to reference system  The MAPS add-on board is working well!

  15. Status now • Full control of the chip • Understand the behaviour by tuning the different parameters • Know how to balance the parameter against each other in order to optimize the noise • Results match the design goals

  16. Summary Thank you! • MAPS add-on board • Working well • Understand how to control the Mi20 with • Ready for beamtime • Further steps: • Prepare setup and software for upcoming beamtime

  17. Backup slides

  18. U-I – characteristics of diode: Non-linear behaviour

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