Re: tagger field map

[Tim Whitlatch <whitey@jlab.org>]

This means that we move the radiator, Quad and tagger downstream 19.6 cm?

Tim

Guangliang Yang wrote:
> Dear Sascha,
>
>     I got the same result, dz=19.6cm.
>
> Cheers
>
> Yang
>
>
>
> ----- Original Message ----- From: "Alexander Somov" <somov@jlab.org>
> To: "Elke-Caroline Aschenauer" <elke@jlab.org>
> Cc: "Tim Whitlatch" <whitey@jlab.org>; "Guangliang Yang" 
> <y.guangliang@physics.gla.ac.uk>; <halld-tagger@jlab.org>
> Sent: Monday, January 12, 2009 2:50 PM
> Subject: Re: tagger field map
>
>
>> Hello Elke,
>>
>> Ok, thanks, I also think that it's the simplest dicision.
>>
>> Yang, could you double check the shift (just to be consistent);
>> I estimated it to be dz = ~19.6 cm.
>>
>> Cheers,
>>        Sascha
>>
>>
>>
>>
>> On Mon, 12 Jan 2009, Elke-Caroline Aschenauer wrote:
>>
>>> On Mon, 12 Jan 2009, Alexander Somov wrote:
>>>
>>> Dear Sascha,
>>>
>>> as Tim already pointed out, we shift our things.
>>> the tagger magnet and if needed also the quad. This is easiest 
>>> because it
>>> does not involve any other parties like the machine group. And there is
>>> enough space in the tagger hall to do that, so please take this mail 
>>> as a
>>> decission.
>>>
>>> thanks elke
>>>
>>>
>>>
>>>> Date: Mon, 12 Jan 2009 09:24:57 -0500 (EST)
>>>> From: Alexander Somov <somov@jlab.org>
>>>> To: Tim Whitlatch <whitey@jlab.org>
>>>> Cc: Guangliang Yang <y.guangliang@physics.gla.ac.uk>, 
>>>> halld-tagger@jlab.org
>>>> Subject: Re: tagger field map
>>>>
>>>>
>>>> Good morning,
>>>>
>>>> Yang thanks for the information.
>>>>
>>>> The question is should we shift the magnets or the
>>>> electron beam pipe which goes to the dump (downstream
>>>> by 19.6 cm)?
>>>>
>>>> Should we shift the quadrupole magnet as well (or one can
>>>> simply change the quadrupole's field) ?
>>>>
>>>> Cheers,
>>>>         Sascha
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Mon, 12 Jan 2009, Tim Whitlatch wrote:
>>>>
>>>>> Good morning all,
>>>>>
>>>>> We do not wish to change the Tagger hall. Is there an exact number 
>>>>> that we
>>>>> should shift the magnet by? Or is 20cm fine?
>>>>>
>>>>> Thanks,
>>>>>
>>>>>      Tim
>>>>>
>>>>> Guangliang Yang wrote:
>>>>>> Dear Sascha,
>>>>>>
>>>>>>    The number in table 4.2 was calculated for the two dipole 
>>>>>> tagger. It is
>>>>>> not correct for the single magnet tagger.  If we don't want to 
>>>>>> change the
>>>>>> tagger hall design, we should shift the tagger downstream by ~20 cm.
>>>>>>
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>> Yang
>>>>>>
>>>>>>
>>>>>>
>>>>>> ----- Original Message ----- From: "Alexander Somov" 
>>>>>> <somov@jlab.org>
>>>>>> To: "Richard Jones" <richard.t.jones@uconn.edu>
>>>>>> Cc: <halld-tagger@jlab.org>
>>>>>> Sent: Friday, January 09, 2009 3:53 PM
>>>>>> Subject: tagger field map
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> Hello Richard,
>>>>>>>
>>>>>>> The magnetic field map in the tagger hall seems
>>>>>>> to be shifted by a few cm in the MC.
>>>>>>>
>>>>>>> According to the table 4.2 in the technical design
>>>>>>> report (updated for the review), the position of
>>>>>>> 12 GeV electrons at z=26.301 m should be x = -4.7576 m.
>>>>>>> However, I get x = -4.803 m, see the plot attached.
>>>>>>> Are the numbers in the table 4.2 correct ?
>>>>>>>
>>>>>>> I used the same reconstruction code as before but just
>>>>>>> replaced the magnetic field map (do I need to shift the
>>>>>>> map ?)
>>>>>>>
>>>>>>> Could you please check. I want to finish with updating
>>>>>>> geometry asap.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>        Sascha
>>>>>>>
>>>>>>> P.S. The full-energy deflection angle in the magnet is
>>>>>>> correct, 13.4 deg.
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>
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>>
>>
>
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