Accelerator Physics group meeting, Feb. 22, 2001

Present: Jie Wei, Sang ho Kim, Marc Doleans, Slava Danilov, 
Jeff Holmes, Eugene Tanke, Paul Chu, Dong O Jeon, John Galambos,
Sasha Aleksandrov, Weishi Wan, Tom Shea, Sarah Cousineau

Jie mentioned that Thom Mason is the new SNS director. Nuria Catalan-
Laheras  will be here next week. This will be an opportunity to specify 
the beam loss terms to give to the activation analysis people. 

There was a discussion on the transmital to the AP group to calculate the 
effect on the accelerator from moving the CUB closer to the accelerator. In 
particular the vibrations induced by the machinercy in this building are a 
concern. Calculating the transmission of vibrations through the ground is a 
time-consuming uncertain business. So the approach is to specify the 
requirements on isolation mechanisms to minimize the vibration source  
leveles at the CUB to tolerable levels. LANL has already started doing this 
work. There needs to be additional work to specify the accecptable levels 
due to microphonic concerns. 


There was a discussion on the concern voiced by Don Rej on the effect on LLRF 
performenace from the reduced temperature control requirement. Tom Shea will 
look into this.

Weishi Wan has picked up the magnet database work Smita Sathe was doing, as 
she has departed. We need to identify a way to get the data into the database 
and also how to give fiducial information to surveyors which accounts for 
errors in the magnet manufacturing.

Eugene Tanke and Dan O Jeon spent last week at LANL. They discussed potential 
commssioning techniques, compared different linac models, and obtained the 
latest versions of parmila and the ,atest input files for SNS.

At the commissioning workshop, the experiments for MEBT and DTL turn on were 
discussed. Planned experiments include RF phase setting, pencil beam aperture 
scans, emittance and profile measurements. Included in the plans was a 
discussion on manpower requirements from the various labs.

Tom Shea reiterated the need for more detailed diagnostic requirements from 
theapplication programming needs.