User name paschke
Log entry time 14:40:27 on May13,2003
Entry number 101687
keyword=injector transmission studiedBriefly took some time with Mike Tiefenbach to check out injector transmission.
We investigated the effect of the master slit (rather than A1 and A2) using
corrector 0I03 vertical. This should have greatest effect on the Hall A
beam, correcting its position on the chopper.
Slits were closed down to match the 3 uA running conditions. The charge
asymmetry in the 1I region was fairly constant, with a width under
100 ppm (!) and a separation between asymmetric peaks of approx. 250 ppm.
It was found that a change in 0I03V of -3 G-cm improved transmission and
reduced both jitter and peak separation.
Figure 1 shows the 0L region measurement of Charge asymmetry for Run 2984
(matching running conditions) and Figure 2 shows the same, for the new
suggested corrector value (Run 2988)
This new corrector setpoint may affect Hall B beam, so MCC may back out of it.
Run Note Aq RMS Aq separation
Run 2982 (slits wide open) 1000 1300
Run 2984 (slits closed, nominal correctors) 2000 2600
Run 2985 (0I03V +1 G-cm) 3000 4500
Run 2986 (0I03V -1 G-cm) 1300 1600
Run 2987 (0I03V -2 G-cm) 700 1100
Run 2988 (0I03V -3 G-cm) 900 250
FIGURE 1
FIGURE 2
