[Frost] Tagger correction analysis

[Michael Dugger]

That is confusing :(

Thanks for the information.

-Michael

On Tue, 12 Oct 2010, Eugene Pasyuk wrote:

> Mike, this tracking phi is not azimuthal but polar angle. This phi is
> the same as theta in usual convention.
>
> -Eugene
>
>
> Michael Dugger wrote, On 10/12/10 17:56:
>>
>> Hi,
>>
>> The only azimuthal asymmetry (downstream of z=-2.6 cm) in the target
>> blueprints, is the wave guide, and that should be directly beneath the
>> Butanol target.
>>
>> I don't have the blueprints for the start counter. Where can I find them?
>>
>> -Michael
>>
>> On Tue, 12 Oct 2010, Eugene Pasyuk wrote:
>>
>>> Hi Brian,
>>>
>>> Interesting results. I thing it gives us some clues. Particularly those
>>> depletions in phi distributions. The dip for CH2 at ~1.6 radians (close
>>> to 90 degrees) is probably coming from the fact that when particle is
>>> emitted perpendicualrly to the beam it passes through the significant
>>> amount of material. On average equal to the radius of the target which
>>> is 7.5 mm. The is seen only for pions because protons just dont go at
>>> these large angles. Now we need to look in the geometry and find what
>>> corresponds to 0.6 radian from the center of butanol and 0.4 radians
>>> from the CH2. It must be some thick material along this direction or
>>> some corner of volume.
>>>
>>> Brian M. and Mike: could you take a look at this? You figured out all
>>> the geometry. It also may be related to the start counter. We need to
>>> check if the ST offset is correct.
>>>
>>> -Eugene
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 10/12/10 3:28 PM, Brian Vernarsky wrote:
>>>> Greetings FROST list,
>>>>
>>>> I have been continuing to work on the discrepancy between the targets
>>>> in the tagger correction and to that end have looked into the proton
>>>> momentum and the energy loss calculations. I have put together a
>>>> document presenting all that I've looked into which is linked below.
>>>> I present a few questions or discrepancies I wouldn't expect, but
>>>> there may be valid reasons for them to exist, so please let me know if
>>>> you see anything that has an obvious answer or reason. Please let me
>>>> know if you have any questions. The document can be found at:
>>>>
>>>> http://www.andrew.cmu.edu/user/bvernars/FROST_tagger_update_10_12_2010.pdf
>>>>
>>>>
>>>> Brian
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