Accelerator Physics group meeting, Feb. 8, 2001

Present: Jie Wei, Sang ho Kim, Marc Doleans, Slava Danilov, 
Jeff Holmes, Eugene Tanke, Paul Chu, Dong O Jeon, John Galambos,
Sasha Aleksandrov, A. Fedotov, 

Jie discussed the results from the ASAC meeting. Generally the recommendations 
in the initial closeout are favorable from the technical point of view. A 
general theme is to restore cuts to the technical baseline mde in cost 
savings efforts. For example to add back the sextupoles,, R&D cut items and 
pre-op reductions. 

For the next meeting, there is a need to get a better 
basis for the loss curve vs. tune shift. Also, the corresponding real machine 
data needs to be added.The ring working point needs to be finalized in the next months time scale. Also instability analysis will need to be highlighted at 
the next ASAC meeting (including the effect of coupled space-charge and 
impedance effects). There is an ongoing effort to calculate the injection 
box impedance, which will require MAFIA analysis.

There was a discussion on the relationship between the tune shift and the 
primary collimator extent. In particular, the present baseline calls for the 
collimator acceptance to be ~ 1/2 the aperture acceptance. If more aperture 
is alowed for the beam the tune shift will be smaller, at the expense of 
the collimator efficiency.The idea of benchmarking the collimator 
calculations with another code was raised.

Our group needs to be aware of all the work going on at the other labs, in order
to be in a position to take over intellectual ownership of the machine. This work
needs to be documented here also.

Eugene Tankke summarized his work on the linac beam size and phase shift. 
The MEBT is the most critical area with respect to large beam aspect ratio. 
Also the lack  of a current desciption of the accelerator (i.e. docment)
 was raised, but this is a division level task. Finally he mentioned a 
concern on the lack of a MEBT beam stop, and this will be pursued at the 
upcoming commisioning meeting.

Sang-ho Kim has taken over Danny Mangra's vibration measurement duties and is working with the engineers on this. 

Marc Doelans has initial results for multi particle analysis on the cavity 
alignement issue. Initial results appear to indicate a correctable simple 
beam displacement as opposed to emittance growth.

Sarah Cousineau is working on the IUCF space charge data reduction.

Sasha is handing over the MEBT commisioning algorithm work to John Staples.

John Galambos has drafted the application programing requirements, and will 
be contacting others to help with getting more details on the specific 
applications. Also, he is invloved in an ongoing database effort to integrate 
all the databases being used.

Dong O is working  on a MEBT to DTL matching scheme.

Paul Chu is working on implementing trace 3D in a cdev model server. 

Jeff Holmes is working on determining the ring operating working points. 
Existing machine working points will also be put on the tune diagram.