1. Bias routing of short strip on large area detectors G. Casse, University of Liverpool

2. Sensor sizes in 150 mm wafer n.b. 124.68 mm implies 3cm strips; 103.39 implies 2.4cm strips (assuming 4 rows on each sensor)

3. Guard rings Bias rail + resistors gap Schematic 1: 3 “bias-resistor gaps” Schematic 2: 2 “bias-resistor gaps” It must be noticed though that the two external resistor areas are next to the guards (‘inactive’) region. Only one bias line (implant + metal) crosses the detector in the middle. One less resistor region. Two bias lines (implant + metal) cross the detector in the active region. Bias rail + resistors Strip gap The strip gaps shouldn’t be in-active, gap should be in the order of strip pitch

4. Laser study of a resistor area: VELO detector, laser injection, non-irradiated case

5. 300 µm 45 µm Reference Points Resistor area Inner strips Outer strips 0 µm

6. 45 µm Resistor area Inner strips Outer strips Injection points

7. Scan across the resistor area (inner strips firing)

8. Scan towards the resistor area (outer strips firing)

9. CONCLUSIONS Study of possible signal deficit in the resistor region performed with 1060nm laser. Laser spot width 7  m FWHM Signal in the resistor area same size as reference Signal loss approaching the bias line compatible with the laser light shading from the metal bias-line (therefore region with signal deficit should be less than 45  m wide) Possible widening of the inactive area below the bias line after irradiation (larger voltage drop over resistor)?

10. Implications of sensor size 12cmx6cm-6chips 10cmx10cm-10chips

11. Strip sensor parameters DRAFT Gap between strip ends might be sensitive as it is as same as between strips