Message-ID: <47CD7F19.7000505@lnf.infn.it>
Date: Tue, 04 Mar 2008 17:55:53 +0100
From: Susanna Guiducci <susanna.guiducci@lnf.infn.it>
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To: "Mark A. Palmer" <map36@cornell.edu>
CC: ilcdr@lbl.gov
Subject: Re: This Week's Damping Ring Discussions at the Sendai GDE Meeting
References: <47CB6B12.5040200@cornell.edu> <47CD13B2.9000609@cornell.edu>
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Hi Mark, Andy and Junji

I mainly agree with ranking reported in the lattice evaluation document; 
below just a few comments:

*1) * Lattice design and dynamical problems

I think that the optimal value of the momentum compaction for RF and 
bunch length is around 2 e-4 and therefore the choice is between *FODO5* 
and *DCO*, which are centered on this value.

*FODO4* has a satisfactory dynamic aperture at ac=2e-4. This is the 
result of an accurate optimization work  and  shows that FODO lattice  
has a large flexibility  ( 4-fold   and 8-fold symmetry, ac=6 e-4 -  1.7 
e-4) and  it can achieve a satisfactory  dynamic aperture.

*DCO* has a dynamic aperture satisfying the minimum design requirements 
for ac=2.8e-4 and 1.7e-4. I'm confident that it can be improved with 
dedicated work.

*2) *Conventional facilities and services

For the EDR phase the choice of the layout is crucial since it is 
strictly connected to the choices of the CFS.
The racetrak layout of the *DCO *lattice with 2 long straights, where 
the major components are clustered in alcoves within a few hundred 
meters from the access shafts, seems to me the optimal solution for 
costs reduction and operational efficiency.

Therefore I agree with the choice of the *DCO* lattice for the EDR.

I think that the choice of the arc cell is less critical than the layout 
choice; more or less all the lattices can achieve the design parameters 
but it is important to fix one and  to concentrate all the efforts on 
dynamic aperture optimization, evaluation of low emittance tuning and  
collective effects and on cost/benefits optimization.

Thank you for the exhaustive work done for the comparison,

Susanna

Mark A. Palmer wrote:
> Hi All,
>
> The attached note summarizes today's lattice evaluation session at the 
> Sendai meeting.  The relative ratings among the lattices is quite 
> close demonstrating the amount of effort that went into each design.  
> At this point, we would appreciate comments from all interested 
> parties on the ratings that were applied.  Please use "Reply All" when 
> responding to ensure that everyone is able to view your responses.  
> Also, please submit your comments within the next 24 hours since this 
> evaluation needs to be presented to the Project Managers before the 
> end of the workshop on Thursday.
>
> At this point we would like to thank all of those who participated in 
> the lattice design effort for all of their hard work.
>
> Thanks,
> Mark, Andy and Junji
>
> Mark A. Palmer wrote:
>> Hi All,
>>
>> The damping rings sessions at this week's Sendai GDE meeting will all 
>> be accessible via WebEx.  The agenda is available from the TILC08 
>> web-site (follow the
>> Program link from the homepage): 
>>
>> http://www.awa.tohoku.ac.jp/TILC08/index.html
>>
>> In particular, we would like to point out that Tuesday morning's 
>> discussion will focus on the selection of a baseline DR lattice.  
>> Everyone is strongly encouraged to participate in this discussion. 
>>
>> WebEx connection details for Tuesday and Wednesday in Sendai will be 
>> forwarded in two subsequent emails.
>>
>> Please join us,
>> Mark Palmer & Junji Urakawa
>>
>> Tuesday DR Sessions:
>>> Junji Urakawa invites you to attend this online meeting.
>>>
>>> Topic: Sendai-GDE-DR
>>> Date: Tuesday, March 4, 2008
>>> Time: 8:00 am, Japan Standard Time (GMT +09:00, Tokyo )
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>>>
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>>>
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>>
>> _____________________________________________________________________
>> Mark A. Palmer                    LEPP Accelerator Group
>> E-Mail: map36@cornell.edu         US Mail: 222 R.R. Wilson Laboratory
>> Voice : (607)255-4240                      Cornell University
>> FAX   : (607)255-8062                      Ithaca, NY  14853-8001 
>>
>>
>>
>>
>>
>>
>>
>>   
>
> -- 
> _____________________________________________________________________
> Mark A. Palmer                    LEPP Accelerator Group
> E-Mail: map36@cornell.edu         US Mail: 222 R.R. Wilson Laboratory
> Voice : (607)255-4240                      Cornell University
> FAX   : (607)255-8062                      Ithaca, NY  14853-8001 
>
>
>
>
>
>
>
>