Initial Tracking Tests of DHC Tower Kurt Francis

Initial Tracking Tests of DHC Tower Kurt Francis, Donna Kubik - Northern Illinois University Update - 09/24/2003 1

Current Status • Very primitive tracking software • Using Visual Basic • PMT #1 (Bottom) is given priority because PMT#1 generates the Dynode 12 signal - used to generate trigger • Layers 1 and 2 are connected to PMT#1 • Treats layers as pairs • Simple logic – For every column ; if either 1 or 2 cells from one column in layers 1 & 2 are hits then start track - counts layers hit – Every column of layer pairs 3 and 4 - count layers hit 2

Paddle 1 MIP PMT 2 TOP 1 3 x x 6 4 5 2 3 2 1 7 7 6 5 4 5 4 PMT 1 BOTTOM Dynode 12 4 3 2 1 7 6 1 5 7 4 3 2 5 4 x x 6 5 5 4 5 4 6 5 1 7 4 5 4 6 7 3 6 7 3 6 7 3 1 2 Array 6 Layer 4 1 2 Array 3 Layer 3 1 2 Array 9 1 2 Array 4 1 2 Array 12 1 2 Array 11 1 2 Array 5 1 2 Array 10 Layer 2 1 2 Array 8 Layer 1 1 2 Array 7 1 2 Array 2 2 3 Paddle 2 3

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Summary • With 10 QDC counts from Pedestal as the threshold only 4% of the events have tracks that pass through all four layers. • All of them are straight through a column • The percentage of 3 layer tracks is a strong function of the threshold 5

Next Steps • Still want to do more tests with Light Yield and S. P. E. • Try to use dynode-12 signal from second PMT to create 4 -way coincidence trigger or to replace one of the Paddles • Improved tracking software • Test different arrays with available PMTs 6