Accelerator Physics Group Meeting 05/24/2001

Attendance: J. Wei, M. Doleans, S. Assadi, P. Chu, S. Cousineau, S. Danilov, 
            J. Galambos, J. Holmes, S. Kim, W. Wan, S. Aleksandrov,  E. Tanke,

General issues and information:

J. Wei discussed the upcoming PAC, USPAS, space charge workshop and Snomass meetings. 
At the space charge workshop, there will be 2.5 days of meetings, with the goal
of obtaining a set of conclusions. To this end, there will be session chairs
and people acting as secretaries for each of the three main sessions. We should
take the opportunity to collaborate with people attending the workshop, and learn 
more about their simulation tools. At PAC and Snomass, we should take the opportunities to
discuss the accelerator physics issues raised at the DOE review.


Sahsha Aleksandrov will look at the loss measurement ideas coming from the LEDA 
experiments at LANL

John Galambos noted that the application programming effort also needs attantion (in addition
to the accelerator physics recommendations). Especially in light of the increased emphasis
on commisioning. In order to better coordinate the BNL and ORNL AP efforts,
we should try and ioncorporate the Trace-3D code in the UAL framework. Discussions 
with Nikolay need to be initiated.

Marc Doleans presented the cavity misalignment work. It was agreed that an analytic
benchmark would be appropriate, in addition to the numerical simulations.

Euhgene Tanke discussed simulation comparison results between linac tracking codes. 
Result differences are attributed to different treatments of the E-field approximation 
in the SCL cavity end cells.  







Muriel Tate, the new secreatary  was introduced.

John Galambos described the upcoming DOE review dry runs, explaing also the 
increased presence of ORNL staff. He also described the new computer 
equipment (CD R/W and scanner setup), urging people to use this for archive 
purposes, as oppossed to the alice cluster  hard drives.  Stuart Henderson 
will be visiting and everyone is invited to get together for the evening.

Paul mentioned the progress running a model server, using cdev and a 
standaloe C++ driver. There was a general discussion on application 
programing and the ideal general architecture consisting of thin clients 
useing middle layer servers, which may possibly cdev servers.

Jeff noted that the space charge model with wall boundary conditions is 
complete and initial benchmarks look reasonable. 

Slava Danilov is working on a full 3-D space charge model to be used in 
conjunction with the impedance module. This will also be coupled with Jeff's 
boundary condition methods.

Sarah Cousinae has completed the collimator model in ORBIT. This model is 
geared towards the low energy range applicable for SNS, and is the first 
collimation model to be directly  coupled to beam dynamics. 

Sang ho noted that JLab has hired Haipeng Wang for HOM analysis. He has 
finished the initial HOM analysis. Also JLab is  starting HOM measurements of 
the beta = 0.61 and beta = 0.81 cavities.