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User name Jixie
Log entry time 14:31:26 on April 6,2012
Entry number 370771
keyword=Beam slip the target cup but HRS can not tellHere is the example that the beam really hit the target cup if look at the spot_3 but the HRS spot results can not tell this situation.
Figures attached here is for the C12 dilution run for 1.729.
Run # 3794, 22817, 40872|40873
Figure 1 is for the 3rd arm spot. Fitgure 2 id for left and right HRS.
The bean is at the locked position. But it scratch the C12 target cup and seen bt the 3rd arm. The reason that HRS can not see that i simply because HRS have very small momentum and angle acceptance. Those electron scattered by the top left cup need to go through the whole cup to reach LHRS or need to have much larger angle to get into right HRS.
FIGURE 1
FIGURE 2
