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2015/8/3 MPGD@LZU 2
Contents
• Time properties of MPGD signals
• MPGD studies in Lanzhou university
• future plan
2015/8/3 MPGD@LZU 3
Time properties of MPGD signals
• Fast raising time
– No inductive signals in
drifting
2015/8/3 MPGD@LZU 4
Time properties of MPGD signals
• Fast raising time
• Signal duration depends
on the way of energy
deposition
2015/8/3 MPGD@LZU 5
Time properties of MPGD signals
• Fast raising time
• Signal duration depends
on the way of energy
deposition
– Particle identification by
time cut
2015/8/3 MPGD@LZU 6
Time properties of MPGD signals
• Fast raising time
• Signal duration depends
on the way of energy
deposition
– Particle identification by
time cut
• The maximum duration is
independent of incidental
energy
– Correct the initial position
2015/8/3 MPGD@LZU 10
Got the expected result, but also issues
归一化
Mean=89.4 σ= 1.744
Mean=135.7 σ= 22.8
2015/8/3 MPGD@LZU 12
Garfield++ simulation of the double GEM (as a reference)
Edrift=1kV/cm
EGem=58.33kV/cm
gain=9032
2015/8/3 MPGD@LZU 13
Garfield++ simulation of the double GEM + Mesh
Edrift=1kV/cm
EGem=58.33kV/cm
Eamp=40kV/cm
gain=68930
Schematic view of fast neutron imaging
2015/8/3 MPGD@LZU 14
neutron
collimator
proton
PCB
metallic mesh
polyethylene
2015/8/3 MPGD@LZU 16
Challenge of DAQ for offline analysis (18×10 cm)
8(bit)×50MHz×1700(channel) = 79.162 GB/s
2015/8/3 MPGD@LZU 18
Steps of online track reconstruction
• Divide signals according time —— time slide
– Segmentation in readout plane —— cut on signal amplitude
– Combine adjacent segment —— identify clusters of hits
• Process multi time slides
– Combine adjacent time slides —— distinguish if signal continues
– Integrate multi time slides —— identify the start and end of a
signal
Simulation with Quartus II (FPGA development)
2015/8/3 MPGD@LZU 22
Signal ID
charge
Cluster sum X,Y position
Improved signal/noise ratio
2015/8/3 MPGD@LZU 24
Old panel,
RMS of noise
~16.89
New panel,
RMS of noise
~6.99
Reduced ~60% noise
@ JLab
Future plan
• Detector —— build a hybrid MPGD
– Gain, rising time, spark
• DAQ
– Simulation + test on develop board
– Design of the peripheral circuit
• Way of signal readout
– Position encoding
2015/8/3 MPGD@LZU 28
Future application II
2015/8/3 MPGD@LZU 32
nuclear material thermal neutron
fast neutron
PC
B
poly
eth
yle
ne