1. PIXEL SCANS

2. Measuring Data Measure last point before graphs cuts off at 1/10³. Measure last point before graphs cuts off at 1/10³. For spread of data, imagine fitting curve and take point where it would cross X axis. For spread of data, imagine fitting curve and take point where it would cross X axis. For larger spreads of data (see opposite), fit cubic polynomial. For larger spreads of data (see opposite), fit cubic polynomial.

3. Mask Scanning 9 x 9 Mask Scanned 9 x 9 Mask Scanned 3 x 3 Aperture 3 x 3 Aperture 60% Intensity 60% Intensity 50μm step size 50μm step size 1064nm Wavelength 1064nm Wavelength 25Hz Firing Frequency 25Hz Firing Frequency Continuous Firing Continuous Firing Scan Type: mpsAnalysis Threshold 149 Scan Type: mpsAnalysis Threshold 149 Scanned Between 50 and 350 units. Scanned Between 50 and 350 units.

4. Mask Scanning – 3D Data Plotted In 3D for aesthetics. Data Plotted In 3D for aesthetics. Cut Off Point Measured By Eye, defined as when no hits are recorded with more than 1/10³ frequency. Cut Off Point Measured By Eye, defined as when no hits are recorded with more than 1/10³ frequency.

5. Mask Scanning: Histogram Gaussian Fitted Ignoring Saturated Data Points. Gaussian Fitted Ignoring Saturated Data Points. Fitted by eye so may not be optimum Fitted by eye so may not be optimum

6. Mask Scans Other Region Another region was also scanned, 6mm down on sensor. Another region was also scanned, 6mm down on sensor. Prob statistic for green histogram is 0.1688. Prob statistic for green histogram is 0.1688. Mean = 186.7 ± 4.3. Sigma = 32.21 ± 4.11

7. Pedestal Adjustment Pedestals For each Pixel Subtracted And Data Replotted Pedestals For each Pixel Subtracted And Data Replotted

8. Pedestal Adjusted Histogram Gaussian Again Fitted By Eye. Gaussian Again Fitted By Eye. Histogram Does Not Include Saturated Pixels - 72 points. Histogram Does Not Include Saturated Pixels - 72 points.

9. Pedestal Adjustment In Other Region

10. Intensity Automate d Scans of Intensity For Several Pixels Automate d Scans of Intensity For Several Pixels 30-100% Alternatin g Steps of 2% and 3%. 30-100% Alternatin g Steps of 2% and 3%. Scanned between 0 and 500 units. Scanned between 0 and 500 units.

11. Does Turning Laser Off and On Make A Difference? NO SIGNIFICANT DIFFERENCE

12. Alignment Data Scanned In Alternating 5 and 6 micron steps, over whole of Pixel (28,143). Scanned In Alternating 5 and 6 micron steps, over whole of Pixel (28,143). 2 x 2 Aperture 2 x 2 Aperture 1 x 1 Mask over chosen pixel 1 x 1 Mask over chosen pixel 60% Intensity 60% Intensity (All other settings same as for Mask Scanning) (All other settings same as for Mask Scanning) Coordinates arbitrary to allow ROOT plots. Coordinates arbitrary to allow ROOT plots.

13. Alignment Plots Looks As Though Laser Is Out of Focus!!!

14. Focused Alignment Scans Scanned Along X Axis Through Centre of Four Pixels (Separate 1 x 1 Mask for each) Scanned Along X Axis Through Centre of Four Pixels (Separate 1 x 1 Mask for each) 2 μm steps. 2 μm steps. Pixel (29,143) best displayed twin peaks. Pixel (29,143) best displayed twin peaks.

15. Pixel (29,143) Alignment Scanned along Y axis (through maximum point from earlier scan) to find Diode. Scanned along Y axis (through maximum point from earlier scan) to find Diode. Then along X axis, through maximum Point from Y Axis Scan. Then along X axis, through maximum Point from Y Axis Scan.

16. END More data is at SpiderWiki http://hepilc01.pp.rl.ac.uk/spiderwiki