Accelerator Physics Group Meeting
March 15, 2001

Present: Jie Wei, John Galambos, Weishie Wan, Marc Doleans, 
Sang ho Kim, Slava Danilov, Sasha Aleksandrov, Dong O Jeon, 
Eugene Tanke, Saeed Assadi

Jie mentions that a PCR would be done to fix the energy at 1 GeV. 
We need to stay within the present baseline hardware limits (i.e.
power supply capability). We will assume success in the e-polishing of
the cavities - namely higher gradients.We need to look at different
configurations, and their merits such as stability considerations. A pencil
beam is being considered with 10-20% of the nominal emittance for 
linac commisioning. This would operate at a reduced duty factor, with 
something like a 100 micro-sec pulse. Also a linac power 
supply budget needs to be constructed including effects such as 
Lorentz detuning, micro-phonics, missing cavity operation, reference
line temperature changes, etc.

The ring PCRs had some confusion, but $2.4 M remain unapproved.

We should write notes on our work.

The loss source term work on the linac was discussed. The gas stripping
term dominates at low energy.

Slava noted that we may be near the threshld of the longitudinal 
instability regarding the injection foil assembly, but the very high Q 
used in the estimate is likely unrealistic. However the transverse 
stability is still likely a problem.

Jeff reported on the beta beat studies in the ring, from non-systematic 
errors in the large bore quads. about a 0.4% error produces a 10% beta beat.