1. Progress of GEM R&D in Lanzhou Univerity
Yi Zhang

2. Time properties of GEM-detector signal R&D of GEM detector
Contents
Time properties of GEM-detector signal
R&D of GEM detector
R&D of GEM-Daq
Future plan
Aug. 11, 2016
Prog. of GEM R&D in LZU

3. Time properties of MPGD signals
Fast raising time
Signal duration depends on the way of energy deposition
Particle identification by cut on time
The maximum duration is independent of incidental energy
Correct the initial position
Aug. 11, 2016
Prog. of GEM R&D in LZU

4. try to reduce the load of DAQ by clustering on hardware level (FPGA)
Goal
reduce the local rates by rejecting γ signals according to the time information
try to reduce the load of DAQ by clustering on hardware level (FPGA)
Aug. 11, 2016
Prog. of GEM R&D in LZU

5. To demonstrate the conclusions, a test was done
Mean=89.4ns
σ= 1.744
Mean=135.7ns
σ= 22.8
SP-ADQ412: 1.8GHz
Aug. 11, 2016
Prog. of GEM R&D in LZU

6. Garfield++ simulation of the double GEM + Mesh
Garfield++ simulation of the double GEM (reference)
Edrift=1kV/cm
EGem=58.33kV/cm
gain=9032
Garfield++ simulation of the double GEM + Mesh
Edrift=1kV/cm
EGem=58.33kV/cm
Eamp=40kV/cm
gain=68930
Aug. 11, 2016
Prog. of GEM R&D in LZU

7. R&D of GEM detector
Aug. 11, 2016
Prog. of GEM R&D in LZU

8. New readout panel To APV25 167 channels in 10 cm PANASONIC 130P
Aug. 11, 2016
Prog. of GEM R&D in LZU

9. New version of triple-layer GEM detector
Aug. 11, 2016
Prog. of GEM R&D in LZU

10. High voltage and trigger
MPD+V1218 HV
drift electrode 5M
10M
6KV
103M
10M
CF8000 discriminator
}GEM I
}GEM II
}GEM III
6KV
103M
15M
Trigger
Aug. 11, 2016
Prog. of GEM R&D in LZU

11. Test result of new detector (55Fe)
σ~127um
σE~19.5%
σ~127um
Aug. 11, 2016
Prog. of GEM R&D in LZU

12. x-ray imaging by new detector and Daq
10 cm
detector & daq system
Aug. 11, 2016
Prog. of GEM R&D in LZU

13. R&D of GEM-Daq
Aug. 11, 2016
Prog. of GEM R&D in LZU

14. coincidence trigger to identify muon and photon
Aug. 11, 2016
Prog. of GEM R&D in LZU

15. Real signals recorded in Daq
55Fe
cosmic μ-
Aug. 11, 2016
Prog. of GEM R&D in LZU

16. comparing signal amplitudes of different particle
x-ray in 1 period
x-ray in
mutil period
muon in 1 period
muon in
mutil period
Aug. 11, 2016
Prog. of GEM R&D in LZU

17. Avalanche electrons collected on by detector (simulation)
Aug. 11, 2016
Prog. of GEM R&D in LZU

18. Steps of online track reconstruction
Divide signals into time slices (1 period for each)
Segmentation in readout plane —— cut on signal amplitude
Combine adjacent segment —— identify clusters of hits
Process multi time slices
Combine adjacent time slices —— distinguish if signal continues
Integrate multi time slices —— identify the start and end of a signal
Aug. 11, 2016
Prog. of GEM R&D in LZU

19. Forming hit clusters in one time slice (simulation)
Aug. 11, 2016
Prog. of GEM R&D in LZU

20. Development board: ARRIA GX FPGA toolkit
EP1AGX60DF780C6N
Aug. 11, 2016
Prog. of GEM R&D in LZU

21. Forming hit clusters in 1 time slice
fake data test (27×27 chns)
Aug. 11, 2016
Prog. of GEM R&D in LZU

22. Processing speed VS signal coverage ratio
Used FPGA periods
Ratio of fired channels in 1 period (%)
Aug. 11, 2016
Prog. of GEM R&D in LZU

23. Resources consumption budget (2048 chs)
from INFN :
reports of our code:
Iterms of resources
Total
Usage of current daq
Usage of out code
Combinational ALUTs
48,080
21,247
(44%)
14,092
(29%)
Dedicated registers
13,382
(28%)
32,224
(67%)
DSP
256
3(1%)
Block Memory Bits
2,528,640
1,808,252
(72%)
73,216
(3%)
Aug. 11, 2016
Prog. of GEM R&D in LZU

24. Combine few time slices, get the complete tracks (simulation)
Aug. 11, 2016
Prog. of GEM R&D in LZU

25. Identify the tracks (simulation)
Aug. 11, 2016
Prog. of GEM R&D in LZU

26. Try to identify signals of different particle (data)
period2/period1
period3/period1
period3/period2
Aug. 11, 2016
Prog. of GEM R&D in LZU

27. γ background in SoLID GEM
5 kHz/mm2
from SoLID PreCDR
Aug. 11, 2016
Prog. of GEM R&D in LZU

28. primary electron-ion couples in triple GEM
Aug. 11, 2016
Prog. of GEM R&D in LZU

29. Signals induced by 1 track
FEE rising time (22ns) included
Aug. 11, 2016
Prog. of GEM R&D in LZU

30. process multi time slices on FPGA test with real beam data?
Future plan
process multi time slices on FPGA
test with real beam data?
communicate with INFN experts
try to merge our code into current firmware
Aug. 11, 2016
Prog. of GEM R&D in LZU

31. Thank you !

32. Aug. 11, 2016
Prog. of GEM R&D in LZU