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

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

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

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

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. (03.07.17) Really?(05.07.17) 7/21/2017 Yes, but not on 03.07.17. (13.07.17)

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

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 3 - 2.5fC. 7/21/2017

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

Strontium source cluster size = 1, TOT 360V It’s moving! 390V This is not a triggered data set. 7/21/2017

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

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

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

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

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 7/21/2017

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

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

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