[MAP] Meeting on Charge Separation - July 7, 14:00 CDT

[Roljohn at aol.com]

Hi All,
    I believe the discussion of charge separation is a  diversion from what 
the muon cooling team should be addressing.  I still  maintain that if the 
issue is feasibility, then charge separation is  irrelevant.  Suppose, for 
example, that a $1B cooling channel or part of  one had to be duplicated for 
a muon collider because we couldn't figure out how  to separate charges.  An 
extra $1B for a $10B project is still only a 10%  effect, which is in the 
noise compared to the other uncertainties in a MC  design.
 
    There are more pressing issues and straightforward  ways to address 
them by experiment and calculation.
    We have to come to grips with the comparisons of  techniques, not only 
for the assumptions in the simulations but the  implied hardware 
capabilities.     
    The proponents of cooling channels should be asked  to prepare their 
end-to-end simulation input files so that an unbiased but  knowledgeable 
accelerator scientist could duplicate the  calculations. 
    Understanding the maximum charge that an RF bucket can  hold for a 
given frequency and phase angle will have very large  implications for any 
design that has an end to end  cooling/acceleration/collision plan.  
    Likewise, the maximum RF gradient, breakdown  sensitivity, and 
sensitivity to external magnetic fields for vacuum and  pressurized cavities are 
important inputs to any comparisons.   Identifying critical experiments will be 
helpful to get priority to do them  and a very important role the muon 
cooling team could play.
    Engineering questions related to superconducting  magnets and energy 
absorbers can limit the performance of the cooling  channels.  Understanding 
and pushing the state of the art and developing  prototypes should also be 
encouraged by the muon cooling team.
    Rol
Dr. Rolland  Johnson
President, Muons, Inc.
(757) 870-6943 (cell)
(757) 930-1463  (home office)  

 
In a message dated 6/30/2010 4:02:19 P.M. Eastern Daylight Time,  
tjrob at fnal.gov writes:

As  discussed last week, we will have a meeting to discuss charge 
separation in  
the context of muon cooling. This is part of the ongoing series of  
meetings and 
discussions on comparing and assessing cooling  techniques.

Date:   July 7, 2010
Time:   14:00 CDT
Room:   Rec Room  (WH4NW)
Bridge: 510-665-5437, ID 0002
URL:     http://indico.fnal.gov/conferenceDisplay.py?confId=3456

Bob Palmer,  Rick Fernow, and Dave Neuffer will talk about their ideas and 
results. If  you also have something to present on this topic, send email 
to Tom  
Roberts  (tjrob at fnal.gov).
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