1 Tracking Tests of DHC Tower Update - 10/01/2003 Kurt Francis - Northern Illinois University

2 PMT 2 TOP x55 1 x247 PMT 1 BOTTOM x x Array 11 Array 12 Array 4 Array 9 Array 3 Array 6 Array 2 Array 7 Array 8 Array 10 Array 5 Array MIP Layer 1 Layer 2 Layer 3 Layer 4 Dynode Paddle1 Paddle2

3 Current Status 63/4601 = 1.6% events have all 32 channels active, even the channels not connected to cells, looks like bad data but I have no explanation yet. –Could be PMT –Could be QDC –Could be triggering system generating extra long trigger

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14 Next Steps Track down source of 32 channel events Try to use dynode-12 signal from second PMT to create 4-way coincidence trigger or to replace one of the Paddles Still want to do more tests with Light Yield and S.P.E.