1 CALICE simulation results G.Villani 06 Cell size: 50 x 50  m 2 21 hits simulated, 5  m pitch 121 extrapolated hits / pixel 961 extrapolated hits /

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1 CALICE simulation results G.Villani 06 Cell size: 50 x 50  m 2 21 hits simulated, 5  m pitch 121 extrapolated hits / pixel 961 extrapolated hits / cell Pixel layout Cell  m 3.5x3.5  m 2 0.9x0.9  m 2 Simulated cell layout

2 CALICE simulation results G.Villani 06 Σ diodes Collected charge vs (x,y) 0V 1.5 V 3.3 V Bias Diode : 1.5V fixed Nwell: 3.3V Pwell: 0V Subs: float Epitaxial thickness: 12  m

3 1/S Central cell Q coll (x,y) sample CALICE simulation results G.Villani 06 Error in pixel coverage e-e- Comparator’s threshold: 50 e - Comparator’s threshold: 75 e - Comparator’s threshold: 100 e - Comparator’s threshold: 125 e - Comparator’s threshold: 150 e - Comparator’s threshold: 175 e - Comparator’s threshold: 200 e - e - threshold Pixel coverage (e - threshold)  e -

4 Charge collected by central Nwell CALICE simulation results G.Villani 06 t ≈38 ns≈25 ns ≈3 ns ≈300 ns  Charge lost by central N Well around 620 e - 0.1*

5 Diode charge collection time CALICE simulation results G.Villani QT(s)  Collection time  300 ns for pixel coverage  Reduction of collection time for ‘smaller’ pixels: 350 ns300 ns 250 ns

6 Minimum Σ charge signal ≈ 100 e - Optimal threshold ≈ 140 e- Collection time ≈ 300 ns for pixel coverage Conclusions CALICE simulation results G.Villani 06 Increase in minimum collected charge requires to increase the collecting surface:  Increase diode size ( 1.8  m in progress)  Increase the number of diodes Ultimately, the S/N for both approaches dictates the optimum solution Collection time can be decreased by reducing inter diodes distances: probably more effective with increase number of diodes rather than surfaces Likelihood of consecutive hits on the same pixel Optimal coverage examples