1. Cross-talk Shahab Khan

2. Procedure 1 Replace the six cell on the perimeter of the array with three transparent unconnected cells, in order to support the center cell in place. Secure the array and measure current To PMT

3. Procedure 2 Replace the connected cells to their original positions Secure the array Position the source in the same location as in procedure 1 Take the mean of 500 measurements To PMT

4. Results

5. Analysis Average cross-talk for white cells is 5.72% Average cross-talk for black cells is 1.20% Average light output for all the white cells is 568 nA Average light output for all the black cells is 469 nA

6. A future project Need automated procedure for painting cells that will precisely apply the desired amount of paint on the surface Determine light output and cross-talk as a function of thickness of paint Choose thickness that optimizes light output, and at the same time is below the maximum cross-talk allowable

7. Short term Received new case on Thursday afternoon, will proceed with improved scan in x Search for new stepping motor and base for xyz controls Perform uniformity of PMT input test as follows:

8. Uniformity of PMT input Keeping all other experimental conditions the same, the active fiber optic ferrule will be moved to all 16 locations, while measuring the current at each location

9. Accuracy of repetitive measurements One may wonder why measurements vary so much trial after trial if the subject being measured is the same I tried to change a few parameters to analyze this