Inventory Update on RD-50 Silicon Sensors Jeff Wiseman

Sets of Sensors 37 Total Boxes Last year –23 Boxes (22 at SU, 1 at FNAL) –All boxes at SU had IV tests –19 of 22 boxes at SU had CV tests This year –14 New Boxes –7 N on N Boxes (No IV tests done yet) –7 N on P Boxes (5 Boxes of IV tests done) A completed box in this case will be a box that has had the IV test done on it, all new boxes have not had CV test done on them

Inventory by Growth Method FZ (15 Total) –12 Boxes Complete –2 Boxes Incomplete –1 Box at FNAL FZN (1 Total) –1 Box Complete MCZ (21 Total) –16 Boxes Complete –5 Boxes Incomplete

Inventory by Doping Type P-Type (28 Total) –18 Boxes Complete –9 Boxes Incomplete –1 Box at FNAL N-Type (9 Total) –9 Boxes Complete

Inventory by Boxes 2551 (6 Total) –5 Boxes Complete –1 at FNAL 2552 (12 Total) –7 Boxes Complete –5 Boxes Incomplete 2553 (4 Total) –4 Boxes Complete 2535 (6 Total) –6 Boxes Complete 2615 (2 Total) –2 Boxes Complete 2684 (5 Total) –3 Boxes Complete –2 Boxes Incomplete 2446 (2 Total) –0 Boxes Complete –2 Boxes Incomplete

IV Measurements Placement of the high voltage probe is on the bias ring Placement of the low voltage probe is on the rubber pad Guard RingBias Ring Circuit #1 V bias Ground

Old IV Curve

More Recent IV Curve

Depletion Voltages Depletion voltages are taken from the CV measurements Not all of the boxes have been tested Following slides will have histograms of the depletion voltages split up by box, silicon method, and doping –All are scaled to the same voltages, so the comparison between everything can be seen

Plans Continue testing new sensors with both IV and later CV Investigate odd readings by testing sensors with and without rubber pad Start RD-50 Sensor Report, research information as needed