1. The study of GEM detector based on APV25 at CIAE
Shouyang Hu(胡守扬),Xiaomei Li,Siyu Jian,Jing Zhou,Xinglong Li
China Institute of Atomic Energy
(中国原子能科学研究院)
5 August 2015
Duke Kunshan 1

2. outline The GEM detector. The electric system Test results & our plans2

3. GEM detector The test of GEM detector 10cm*10cm 3 GEM foils Cathode
readout
3mm
2mm 3

4. GEM detector The progress in the test of GEM detector 10cm*10cm
3 GEM foils
Argon:CO2=70% : 30%;
256 channels per dimension, 512 channels in total ;
400um
Cathode
GEM1
GEM2
GEM3
readout
3mm
2mm 4

5. The test system 5

6. Spatial resolution and energy resolution.
When:
Slit(um): 20;
Ar: CO2=70: 30;
HV: 3600V;
Cathode
GEM1
GEM2
GEM3
readout
3mm
2mm
2mm
2mm 6

7. Spatial resolution and energy resolution.
Spatial resolution≈76um(sigma) x
counts
Pic.1 x 7
Pic. 2
Pic. 3

8. ε=19.6% cut the baseline from the raw signal integral of the x axis
Spatial resolution and energy resolution.
cut the baseline from the raw signal
integral of the x axis
ε=19.6% 8

9. 256 channels for each dimension( 512 channel in total);
CIAE imaging @ about 1k sample rate
X ray Energy: 10KeV;
256 channels for each dimension( 512 channel in total);
4 APV FECs were used (2 for each dimension) 9

10. CIAE imaging @ about 1k sample rate
The maximum sample rate is several KHz. The sample rate is not high.
APV: 277KHz*141(1 frame)*12bit(12bit ADC)=60MB/s
V2718: 70MB/s (v2718 manual)
VME crate:
80Mb/s(VME64)
improve Firmware;
Data compression;
The connection between APV and detector is not very reliable.
More reliable connector should be introduced in. 10 10

11. The upgrade for the next step
The upgrade of Lab
Lead box
X-ray generator
3D GEM test platform 11

12. The Plans and future experiments in our group
further test of the spatial resolution, energy resolution;
X-imaging;
further test of the unity of GEM detector and APV25 readout electronics;
A GEM detector with 10B transfer layer was ready for neutron imaging; 12

13. Thank you ！ 13