11/28/03 Beam Studies

Day (8:00 - 16:00)

- HallA Energy measurements. No beam to HallC.

Swing (16:00 - 24:00)

- Hall A Energy Measurement. No beam to HallC.

11/29/03 Owl (00:00 - 08:00)

- Called in at around 23:00. Consulted with Lia earlier and agreed to look at the orthogonality/damping at a lower beam current (higher transmission). In previous beam studies, it was seen that the orthogonality did not improve with higher transmission. But these were injector studies with no beam to Hall (thus there was no information about the damping to hall).
- Tried beam currents of:

Beam Current:    Transmission:  Angle at 0i02A:  Xdamping:  Ydamping:
10uA		 100%		-72.4 deg.	 125	    4.4
10uA upright phasespace	 100%	-85.9 deg.	 38	    4.1
20uA		 100%		-72.1 deg.	 221	    4.5	 
30uA		 91%		-72.2 deg.	 51	    5.3
40uA		 75%		-71.5 deg.	 23	    4.8

1. We see that the X damping is significantly improved with improved transmission. The damping factors for 100% seem to above the theoretical limit for the 20uA run, but that maybe an artifact of the where the BPMs lie on the betafunction.
2. When the phasespace is rotated at 1i06 for it to be "upright", the transmission in X drops significantly.
3. The Y damping does not seem to improve at all with increased transmission. When one looks at the phasespace, we see that most of the orthogonality breakdown is dominated by rotations in the PZTY signal. It seems to me that there is still significant transverse coupling that is spoiling both the orthogonality in the injector as well as the damping in PZTY.