Full list of devices of May09 Wafer sensor n 15 2E1 08132 2E2 06142 2E3 06151 2E4 09131 3E5 09141 3E7 06152 3E9 10132 3E11 07152 4E6 10141 4E8 03141 WAFER SENSOR N 11    2E1    10142 2E17    08152 2E3     03142 2E4     04152 3E5      04141 3E7      05151 3E9      04142 3E11     05152 4E6      05082 4E8     09071 In red the ones we loaded (see next) Wafer 11 characterized by having few pixels working randomly distributed. Wafer15 characterized by low breakdown voltage. Is it useful to load more, at least from wafer 15?

Loaded devices Device Wafer sensore IV Test Status comments 3E5 09141 15 Vbd at 10V FE does not work properly 3E7    06152 Tuned/calibrated -> Testbeam 3E9    10132 3E11   07152 Not tuned yet 3E5      04141 11 Normal Few pixel working 3E7      05151 3E9      04142 To be tested to be done None yet

IV curves for three devices of wafer 15. Vbd is ~10V. Some more tests on the three devices of wafer 15 that we still have in Genova: Repeat IV scan Noise vs HV Monleak scan Xtalk (done but not understood yet) Noise, monleak and Xtalk only for two devices as one as the FE not working. IV curves for three devices of wafer 15. Vbd is ~10V.

Wafer15: 3e11_07152 Noise vs HV Monleak

20 V The noise becomes higher, especially when two neighbouring pixels are injected at the same time. Increasing the voltage, the noisy area increases. 12 V At 10V the leakage voltage starts raising, few pixels starts becoming very noisy 10 V 8 V

Noise distributions vs HV

Monleak@8V 2D Noise map

Monleak@10V Three pixels show an higher leakage current and their noise starts increasing (also for few neighbours)

Monleak@16V The areas of noise increase around the noisy “pixel seeds’

Wafer15: 3E9_10132 Noise vs HV Monleak

Noise map vs HV 18 V 12 V 10 V 8 V Two areas are visible where the noise increases 10 V 8 V Many pixels are noisy already at low voltages

Noise distributions vs HV

Monleak@8V

Monleak@18V

Outlook Wafer 15 have a low breakdown voltage. This seems correlated to few pixels that start drawing more current. It does not look as a coherent effect or due to cut problem. Debug the FE not working Load more? Is it useful to get more evidence? Understand better the Xtalk results (not shown)