1. First Look at the CEDAR Optics Richard Head (Univ of Bristol)

2. OPTICAL OPTIONS AND DETERMINING CONSTRANTS. TECHNOLOGY CHOICE OF PHOTO MULTIPIERS WILL DETERMINE ARRAY AREA REQUIRING ILLUMINATION. THE VARIOUS OPTIONS FOR MANIPULATION OF THE LIGHT BEAM ARE ALL MIRROR COMPONENTS, MIRROR/ TRANSMISSION COMPONENT COMBINATIONS, LIGHTGUIDES/FIBRE OPTICS OR A COMBINATION OF THESE. THE STYLE AND COMPLEXITY OF THE NON DIRECT TO PMT FACE LIGHT COLLECTION DEVICE IS DEPENDENT ON THE ARRAY ILLUMINATION CHARACTERISTICS.

3. LIGHTBEAM MANIPULATION BY SELECTING AN APPROPRIATE MIRROR SHAPE THE LIGHTBEAM CAN BE REFLECTED THROUGH 90° WHILE MAINTAINING ORIGINAL DIVERGENT CHARACTERISTICS, INCREASE DIVERGENCE, DECREASE DIVERGENCE, MAKE PARALLEL, OR CONVERGENT. THE X:Y RATIO OF THE CROSS SECTION OF THE LIGHT BEAM CAN BE ALTERED BY THE USE OF CYLINDRICAL OPTICAL COMPONENTS

4. ILLUMINATION OF PMT TWO APPROACHES IF ONLY A FEW PMTs –DIRECT ILLUMINATION OF PMT –LIGHT CATCHMENT ASSISTANCE APPROACH MORE PRACTICAL FOR MANY MIRRORS NUMBER AND PACKING DENSITY OF PMTs WILL DETERMINE OPTIONS.

5. ILLUMINATION OF PMT DIRECT ILLUMINATION OF PMT –PRO: EASY TO PROCURE HIGH QUALTY OPTICAL COMPONENTS –CONS: ADDED COMPLICATIONS WITH ALIGNMENT AND CHANGING CONDITIONS LIGHT CATCHMENT ASSISTANCE –PRO: EASY MECHANCAL INSTALLATION –CONS: BESPOKED SOLUTION - COST

6. DIVERGENT BEAM WITH 2 WAY WEDGE MIRROR THE WHITE REPRESENTS A BEAM OF LIGHT WITH A CROSS SECTION OF 30mm X 10mm AT THE BOTTOM RIGHT OF PICTURE DIVERGING AT 15mrad OVER A DISTANCE OF 600mm BEFORE BEING DIVIDED BY A 45°X45° MIRROR SHOWN IN BLUE. DIRECT ILLUMINATION

7. DIVERGENT BEAM WITH 4 FLAT MIRRORS IN ECHLON THIS REPRESENTS THE SAME BEAM AS IN PREVIOUS SLIDE WITH LIGHT REFLECTED TO A SINGLE PMT ARRAY DIRECT ILLUMINATION

8. DIVERGENT BEAM WITH 4 WAY WEDGE MIRROR SAME BEAM AGAIN TO INDICATE WIDE RANGE OF OPTIONS.FOR TARGETTED LIGHT. DIRECT ILLUMINATION

9. DRAWING OF AN ARRAY OF 6 LIGHT COLLECTION DEVICES LIGHT CATCHMENT

10. AN ARRAY OF 6 LIGHT COLLECTION DEVICES QUALITY OF REFLECTIVE SURFACE WOULD BE DEPENDENT ON REQUIREMENT TO HANDLE DIRECT OR STRAY LIGHT.

11. CONCLUSION NEED BETTER UNDERSTANDING OF LIGHT BEAM CRITERIA –STABILITY & REPRODUCIBILITY NEED BETTER UNDERSTANDING OF ENVIRONMENT –EG TEMPERATURE VARIATIONS ETC NEED BETTER UNDERSTANDING OF COST IMPLCATION OF BESPOKED SOLUTION