Test of the MAPS add-on board S. Amar-Youcef, M. Deveaux, D. Doering, C. Müntz, S. Seddiki, P....
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Transcript of Test of the MAPS add-on board S. Amar-Youcef, M. Deveaux, D. Doering, C. Müntz, S. Seddiki, P....
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
CBM Collaboration meeting Split 2009 2 / 16
Test setupTest setupOnly acquisition board changed in contrast to reference systemOnly acquisition board changed in contrast to reference system
Mimosa20 (2008)
Auxiliary board, power supply, signal processing, data transfer
HADES-DAQ compatible, no dead time, big RAM space for data storage or buffering, 50MHz readout clock;Data processing:digitalization, sparsification
Analysis
Sensor
Frontend board (PCB)
MAPS add-on boardon TRB2 (TRBnet)
PC
Data transfer:I/O card or OP-link
Monitoring
Analog signals Sync. signals
CBM Collaboration meeting Split 2009 3 / 16
Mimosa 20 - SensorMimosa20 (2008):Mimosa20 (2008):
•Differential analog output •2 banks•10 submatrices•Multiplexed onto 2 outputs•50 MHz •200 kPixels•30 µm pixel-pitch•SB pixels
30 µm
Cparasitic
Recharge diode
Collecting diode
Output
CBM Collaboration meeting Split 2009 4 / 16
Properties SB-pixel
Cparasitic
Recharge diode
Collecting diode
OutputIrecharge
Ileakage
Potential at output:
Equilibrium: Irecharge =Ileakage
CDS (Correlated Double Sampling):
Noise
CBM Collaboration meeting Split 2009
Potentiometer
5 / 16
Chip slow controlChip slow control
• JTAG interface for chip settings•Working point of source follower•Level marker pixels•Level of signals•Amplification•Analog buffer•Differential output buffer
CBM Collaboration meeting Split 2009 6 / 16
Clusterfinding
Noise
Hit-signal(Pixels over threshold)
Data analysis softwareData analysis softwareData taken and stored!
Import
CDS
Demultiplexing
DataDataData
CBM Collaboration meeting Split 2009 7 / 16
Noise in one Pixel
Noise [ADC]
Charge spectrum of 55-Fe source
Key observables:Key observables:
Noise [ADC]
Calibration [e-/ADC]
GainKα (55Fe )
Noise [e-]
CBM Collaboration meeting Split 2009
Noise Histogramm
Pixel to pixel dispersion of Noise
8 / 16
Status on last collaboration meetingStatus on last collaboration meeting
• We could start running this setup for a first time– Readoutchain working properly– But performance of analoge electronics not clarified
Goal: Goal: •Validate the board designValidate the board design•Check whether we can reach aspired performance Check whether we can reach aspired performance •Maximize sensitivity ↔ minimize noise Maximize sensitivity ↔ minimize noise •Understand MAPS add-on board in detailUnderstand MAPS add-on board in detail
Approach: Approach: •Systematic measurementsSystematic measurements•Optimize settingsOptimize settings
CBM Collaboration meeting Split 2009 9 / 16
ResultsResultsCalibration: gain (@ f=50MHz)
Each data point measured with ‚optimal‘ settings!
Discharge of Kα signal, due to higher recharge current at higher temperatures!
CBM Collaboration meeting Split 2009 10 / 16
SB-Pixel:SB-Pixel:
Potential at output with hit:
Irecharge > Ileakage
Irecharge = Ileakage
Irecharge < Ileakage + ISignal
CDS:
Hit-signal
At higher leakage current:Pixel recharge faster Hit signal smaller
CBM Collaboration meeting Split 2009 11 / 16
Calibration: gain (@ f=50MHz)
Expected saturation value:Expected saturation value:408 ADC = 1640 e408 ADC = 1640 e-
CBM Collaboration meeting Split 2009 12 / 16
Noise w.r.t. chip temperature:
CBM Collaboration meeting Split 2009 13 / 16
Noise w.r.t. readout frequency:
Conclusion: properties are comparable to reference system The MAPS add-on board is working well!
CBM Collaboration meeting Split 2009 14 / 16
Status nowStatus 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
CBM Collaboration meeting Split 2009 15 / 16
Summary
• 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
Thank you!CBM Collaboration meeting Split 2009 16 / 16
Backup slides
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∆ dig
ital
val
ue
10008507005504003002702402101801501209060300
IN P U T-V oltage[m V ]
deflection
m esured value 100kH z
m easured value 1M H z
m easured value 10M H z
m easured value 30M H z
CBM Collaboration meeting Split 2009 17 / 16
CBM Collaboration meeting Split 2009
U-I – characteristics of diode:
Non-linear behaviour
18 / 16