[Bteam] From Isochronous to ‘M56‘ Injector Optics - Jay's plan

[Alex Bogacz]

Jay et al,

     I used OptiM to look into Jay's plan of switching from the present 
isochronous to non zero M56 injector optics. I modeled Jay's procedure 
as follows: the same front end as for the isochronous optics (0L01-05 
quads), replacing chicane quads  (0R01-07) with the new values for 'M56 
Optics' (drastically different) and then invoking 0L06-10 quads to match 
to the desired Twiss values at the end of the chicane (end of 0R04 
dipole) - exactly the procedure that the multi harp matching tool would 
do. I got a very reasonable solution (see the appended slide) where the 
new quad values do not differ by much (max 25%). Looks like multi harp 
should find the solution this time; in general we should not rely on 
matching tools to 'redesign' optics; we have better tools to do it...
     Anyway, you may consider my result as the  'design' Optics.
     Thanks.

         Alex

On 1/22/2012 2:40 PM, Arne Freyberger wrote:
> I've found my old  studies on non-zero M56 chicane optics.   See 
> attachment: slides that were presented to Bteam, Feb. 2010?
> Arne
>
> On 01/21/2012 11:48 AM, yves roblin wrote:
>> On 1/20/2012 2:53 PM, Jay Benesch wrote:
>>> FYI, just in case you get called about this.
>>
>> Jay,
>>     Talked to Arne yesterday.  We can discuss what we want to do 
>> regarding the M56 monday morning after the 8'o clock.
>> I asked Alex to come as well since he's done it before.  From your 
>> elog/email, I do not see anything wrong with your
>>  settings.     Regarding the scraping, I would probably do to M56 
>> first if we decide to go ahead with it, then reassess the injector
>> since we will have to make sure it can do 180.  At that point, we 
>> will see if we are still scraping.
>>
>> Yves
>>
>>
>>>
>>> M56 optics Monday?  Hand phase all the cavities Monday?  Both?
>>>
>>> http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1660807
>>>
>>> http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1660807
>>>
>>> -------- Original Message --------
>>> Subject:     Beam: Scraping indeed
>>> Date:     Fri, 20 Jan 2012 14:25:52 -0500
>>> From:     Hall C Electronic Logbook <cdaq-noreturn at jlab.org>
>>> To: benesch at jlab.org
>>>
>>>
>>>
>>> Link: http://hallcweb.jlab.org/hclog/1201_archive/120120142552.html
>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>>
>>>         User name dalton
>>>
>>>
>>>         Log entry time 14:25:52 on January 20, 2012
>>>
>>>
>>>         Entry number 249121
>>>
>>> keyword=Beam: Scraping indeed
>>>
>>> I agree that it looks like we're scraping the low energy of the beam 
>>> off
>>> somewhere. If I compare the attached figure to previous vertical scans
>>> (links below) then it's the high energy side that looks reasonable
>>> (width and shape) and the low energy side cut off.
>>>
>>> https://cebaf.jlab.org/elog/entry/1622774
>>> https://cebaf.jlab.org/elog/entry/1650911
>>> https://cebaf.jlab.org/elog/entry/1614427
>>>
>>>
>>>
>>> A copy of this log entry has been emailed to: benesch
>>>
>>>
>>>
>>> Figure 1
>>>
>>>
>
>
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