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UM lab activity

UM lab activity. Status report Dec . 7. Hardware progress. We have managed to connect both DRS4 boards to the panel. 4 RO channels and 4 HV channels at the same time. A 4X4 array of pixels is available for measurements – a 2D detector. Same connectors as last week. . Set-Up. C HV =2pf.

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UM lab activity

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  1. UM lab activity Status report Dec. 7 Yiftah Silver, Dan Levin

  2. Hardware progress • We have managed to connect both DRS4 boards to the panel. • 4 RO channels and 4 HV channels at the same time. • A 4X4 array of pixels is available for measurements – a 2D detector. • Same connectors as last week.

  3. Set-Up CHV=2pf Rq=22MOhm HV SnO2 Ni Rout=100[Ohm] Attenuators: For HV line:20dB &inverter For RO line 20dB+20dB Discrimination threshold: For RO lines: -0.5V DRS4 trigger Common trigger – OR on all RO channels 2 DRS4 boards Yiftah Silver, Dan Levin

  4. Bkg measurements • A measurement of hit rate over time was made on one pixel (12X30) with the LabView program and the scope. • The measurement is of RO line 12 after a (10X attenuator). • 24 consecutive hit rate measurements were made, each 15 min long – total of 6 hours.

  5. Hit rate over time (12X30)

  6. From the same measurement: Rise time distribution is obtained by subtracting the time of the point 10% of the peak from 90% of the peak, without any fits.

  7. Few hits were at -20V

  8. Measurements on 4X4 array • A set of measurements were made with the DRS4 boards. • 3 min measurement of bkg • Followed by a measurement when the collimated Sr90 is above the 4 center pixels. • Pulse height distributions were made for each pixel separately at each of the conditions. • “Lego” plots were made for visualization.

  9. Measurements on 4X4 array PV1 99%Ar- 1%CF4 700 Torr , 850V

  10. Subtraction of the bkg from the source The source is clearly seen in the center of the array of pixels

  11. Pulse height distribution 4x4 bkg X axis – mV (this is after 2 attenuators X10 each) Shown here are pixels (10,11)X(29,30)

  12. Pulse height distribution 4x4 bkg X axis – mV (this is after 2 attenuators X10 each) Shown here are pixels (12,13)X(29,30)

  13. Pulse height distribution 4x4 bkg X axis – mV (this is after 2 attenuators X10 each) Shown here are pixels (10,11)X(31,32)

  14. Pulse height distribution 4x4 bkg X axis – mV (this is after 2 attenuators X10 each) Shown here are pixels (12,13)X(31,32)

  15. Pulse height distribution 4 center pixel under source X axis – mV (this is after 2 attenuators X10 each) Shown here are pixels (12,13)X(31,32)

  16. Bkg hit measurement on 4X4 array • We used the common trigger for counting the rate on the 16 pixels. • 60 consecutive measurements were made, each of 15 min (as before) total of 15hours. • Measurement started at Sat. Dec.3 at 6PM • Connected pixels: RO lines: 10-13 HV lines: 29-32 • As before: 850V

  17. Rate over time (16 pixels) A few hours later, no pulses were seen at 850V at all. When voltage was raized to ~870 a fast rate was observed but coming only from one pixel (10X32) The signal itself was different – lower &slower. The beginning of the measurement shows the same behavior as the measurement of one pixel, But, Clearly something happened after ~7 hours

  18. A few hours later and @870 V

  19. Summery • Background needs to be further investigated, after a suck n’ bake we shall replace the current Gas with a new one (still Ar-CF4 at the same pressure and percents) and will try to repeat the hit rate over time experiment. • it seems that both the pulse height and rise time distributions are very narrow but a better examination is needed because of unexpected peaks.

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