[Frost] Tagger correction analysis

[Michael Dugger]

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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