[Clas12tdg] Update on FTOF shield

[Vitaly Baturin]

Hi David,
  please find my comments between lines of your mail

> Date: Thu, 20 Aug 2009 13:35:51
> From: David Kashy <kashy at jlab.org>
> To: Vitaly Baturin <baturin at jlab.org>, clas12tdg at jlab.org,
>     Ralf W. Gothe <gothe at sc.edu>
> Subject: Re: Update on FTOF shield
> 
> Hi Vitaly,
> This is confusing.
> In one place on the slide it says 30gauss in another it says 10 gauss.

 	The previous calculations, shown at slide #3, were done for the 
R9779 shiled 130 mm long in the 30 Gauss field.  This value is too high, 
perhaps(still need to clarify). Therefore I made a new calculations for the 10 Gauss field.
That's what is shown at slide #4. In addition, the shield is shorter,  100 
mm long.

> It also says 200mm long shield the total length of the shield assembly is

Sorry, 200 mm is a mistake. The total length at slide #4 is 100 mm, i.e. 
is equal to the totla length of the R9779 PMT.

> 5.12" so I'm not sure where the 200 comes from.
Both horizonatal and vertical scale is in cm, not in incches.
Bith show the distance from the center od axial symmetric figure, i.e.
  POISSON models show only 1/4 of the total picture. Therore
scale by 2 the  shield  dimensions, shown in cm.

Sorry for confusion
   Vitaly
>
> Thanks
> Dave
>
> Vitaly Baturin wrote:
>> Dear colleagues,
>> I've included the POISSON model of a FTOF shield into the
>> 
>> http://www.jlab.org/~baturin/FTOFVBT.pdf
>> 
>> Please look at slide #4
>>
>>  Regards
>>    Vitaly
>
>
>
>

Vitaly Baturin(Batourine),
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