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User name gwarren
Log entry time 11:59:46 on December 13,2001
Entry number 44814
keyword=ndet position for both Q2
I reviewed all the numbers for the position of the ndet for both Q2 points. I give three numbers: the distance from the target to the front surface of the 3rd plane, the angle of the ndet at the front of the detector, and the angle of the ndet at the back of the detector. The two angles are necessary to allow for the cocking of the ndet with respect to the surveyed lines. I would put uncertainies on the distance of 10 mm and on the angles of 0.07 degrees (that is 5 mm uncertainty in position at 4240 mm from the target).
Q2=0.5,Q2=1.0
position: 4240,6150 mm
front angle: 60.66,53.35 deg
back angle: 60.36,53.27 deg