1. M. Alexeev on behalf of Torino TIGER Test Group
Testing the TIGER
M. Alexeev
on behalf of Torino TIGER Test Group

2. Global testing line Laboratory test electrical tests.
Confirmation of the main expected functional properties.
Coupling of the prototype to a real detector.
Rewind
Extraction of the physical signal using the prototype.
If needed production of an updated version.
7/21/2017

3. Historical note Laboratory testing is considered satisfying.mV
Laboratory testing is considered satisfying.
Gain of the FE
Internal Noise
Noise check with a capacitor
Gain uniformity mV
Coupling to the real detector and extraction of a physical signal.
Ongoing with preliminary results ch
7/21/2017

4. Noise troubles + 3M advertisement
We are very sensitive to the grounding & HV screening, neighboring strips need to be very well grounded.
7/21/2017

5. Changes to the HV distribution
The anode HV is the ref. of the detector and of the FEs.
The anode is connected to the return circuit and the power network ground.
No filtering used on the GEM foils.
Optimization to be done with the final HV distribution.
Presently we ca run at a threshold close to 3fC on the majority of the channels. ( )
Really?( )
7/21/2017
Yes, but not on ( )

6. The working horse
We decided to use the planar chamber as a tool with which we could directly compare the APV and the TIGER.
Additional advantage comes from the simplicity of a trigger installation on the chamber.
The induction gap of the planar chamber is 5mm as the final configuration of the CGEM as opposed to 3mm of the CGEM prototype.
Data can be take with Fe55, Sr90 or cosmics taking advantage of a good HV stability of the chamber.
7/21/2017

7. Noise level LSB = 6,6mV/dig
7,4fC
3,8fC
LSB = 6,6mV/dig
Noise sigma = 6 mV (0,6fC)
Effectively noise level acceptable for the test DAQ = 4 -4,5 fC
During the first successful test we had the threshold that was set above expected values of fC.
7/21/2017

8. Some feeling of the data, TOT Fe55
330V V
strips X
340V
One important remark is the use of TOT method for the charge estimation. We still have to show the QDC on similar data.
350V
360V

9. Strontium source cluster size = 1, TOT
360V
It’s moving!
390V
This is not a triggered data set.
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10. Taking data with cosmics
360V
Some difficulty to preselect the data.
370V
More precise analysis is needed to extract the time distribution.
380V
390V
clk

11. Comment on the clusters, TOT
The present clustering algorithm is very simple, too simple maybe…
A cluster in time is defined as a group of hits within a 5ns time window
The in each cluster in time the continuity of strips is checked.
For the present data quality I expect to have reconstruction artifacts.
7/21/2017

12. Current work
Go down to expected noise levels and look into the data(charge reconstruction) in more details.
Compare the data between TIGER, APV and an standalone amplifier to match the charge reconstruction.
Acquire the data on the cylinder reducing the noise.
Check the performance with the new layer1.
7/21/2017

13. Reducing the noise to 2.5fC – 3fC on the planar chamber
Additional ground connection helped for the missing fC.
Is it a good configuration?
7/21/2017

14. Reducing the noise to 2.5fC – 3fC on the planar chamber, RESULTS
LSB = 1.8 mV/dig
Noise sigma = 2.3 mV (0,2fC)
Effective threshold used in the data tacking = 2.5 fC
2,4fC
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15. Temperature variation and the TIGER
31C
33C
Two new aspects of the TIGER operation with low threshold settings:
Data rate
We are still sensitive to the temperature at this level of sensibility.
The reading of temperature sensor itself created pick-up on the channels.
Ch. num
“time”
7/21/2017

16. Where the cylinder stands
V strips
7,4fC
3,8fC
2,4fC
X strips
Effective threshold used in the data tacking = 3.0 fC on V and 4 – 4.5fC on X strips.
3,8fC
Strong noise increase with HV on, to be understood.
7/21/2017

17. Next steps
Comparison of the TIGER (TOT, QDC) with the APV on the planar chamber.
Cylinder with the HV. We need to understand the noise source.
Check the charge reconstruction on the cylinder.
7/21/2017