Minutes SNS Accelerator Physics Group Mtg.
3/15/02
Present: J. Galambos, S. Henderson, S. Cousineau, J. Holmes, L. Kravchuk,
E. Tanke, S. Aleksandrov, D. Jeon, S. Kim, M. Doleans, P. Chu, A. Shishlo,
 J. Stovall, T. Pelaia, E. Tanke

J. Holmes mentioned trhat a new simulation server is available (ap01.sns.gov).

E. Tanke has prepared a schedule for tank 3 conditioning. 

D. Jeon has looked at possible locations for BSM instruments. One at the end of
tank 1 is not useful. Three are proposed for after the DTL in the CCL. Kravchuck
proposed having one (at least temporarily) at the end of tank 6. To accomodate this,
temporarily removing the transition region quad will be looked into. 

Marc is studying the transverse detuning from the RF cavities.

Sasha is working with V. Aleksandrov preparing MEBT software. A Matlab gui
driven longitudinal setting program is prepared. He is also considering a 
diagnostic for the BIG in the MEBT region.


L. Kravchuk is developng specs for the 402.5 MHz klystron, for a bid for a
second vendor; working with the group on developing a plan for how 
to incorporate ideas to better accomodate working in a a radioactive
machine; an offer for high rad quad  production has been made to BNL; and an analysis
for cavity conditioning shielding is done.

Slava is preparing MAD input for the RTBT to be used in fault studies. He has looked 
at x-y coupling (from the small rotation in the extraction
septum) in the RTBT shows only a small effect. 

Sarah is lloking at comparison of theoretical and simulated choherent 
resonance osciallations, and also looking at collimation issues related to the shape
(round vs. elliptical) of their apertures.

Paul is porting the x-y correlator application to the SN control room environemnt.

Tom is working on a gui interface to the correction application.

Stuart reported on the RTBT flight tube issue near tyhe  target. The present flight tube has a smaller aperture than the RTBT collimator. Efforts are underway to look at increasing this aperture and also decreasing the RTBT aperture somewhat (400 - 350 pi-mm-mrad)

Sang ho is helping Jab with analysis for the medium beta cryo module: there is a desire to
be able to check the field flattness after tuning in tghe cryomodule 
(i.e. operating conditions) using Q measurment information. This appears to not 
be feasible.

Jim Stovall noted the 3-D  E field tracking through the LEBT, and subsequent
tracking through the RFQ and MEBT are proceeding. Billen is working with
Accel on CCL tuning. He noted at the diagnostyic review a concern
was raised about the BCM possibly creating an unacceptable imedance match in the linac.
This will be checked. Also The minimum number of beam pulses needed for SCL commissioning 
is being tabulated. This is needed to address issues realted to the limitations
on the linac dump.