Faculty of Physics, University of Belgrade

ToF readout meeting11th of April, 2013

ToF-L/R redout upgrade (4)

Jovan Puzović,Faculty of Physics, Belgrade

Faculty of Physics, University of Belgrade

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Amplitude

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TRB3 Time• TRB3 time is composed from 2 information

• Coarse time (CT) (11 bits, granularity 5ns, range ~10us, system clock 200MHz)

• Fine time (FT) (10 bits, granularity ~15ps, range 5ns, needs to be calibrated!)

• Time=(CT+FT*NormFactor)*5ns

• EPOCH counter, time > 10us

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Fine time distribution

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Coarse time distribution

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Fine time distribution

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Coarse time distribution

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Pulse width distribution

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Pulse width distribution

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Current status

• TRB3 testing in Belgrade wasn’t successful due to the problems with pulse shape and Padiwa

• Falling edge of pulse is more problematic than the rising one

• According to already recorded data, it seems that we essentially needs Q2T (or QDC) information, not pulse width

• Otherwise, we will be very vulnerable to pulse shape fluctuations - QDC is needed for amplitude walk correction (leading edge timing!)

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Conclusion

• TRB3 still very promising• In my opinion, this is normal problems which

we facing during testing the new equipments which is cutting edge of tehnology

• We underestimate problems and time needed for evaluation!

• Waiting for data recorded in CERN!

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THE END

Faculty of Physics, University of Belgrade

ToF readout meeting, 11.04.2013.Page 13 out of 11Jovan Puzović, Belgrade SHINE team

New test system

Scint + PMT~1 m

22pF betweensignal and ground

~0.0 m

~0.2 m

Padiwa

Ch0Ch1Ch2Ch3

Monitor outputto be connected to DRS4

Needs changes in Padiwa FPGA, has to be check with Michael is it possible