[Sane-analysis] Follow-up on tracking through the reversed target field

[Whitney R. Armstrong]

Here is the link instead...

http://quarks.temple.edu/~whit/SANE/talks/CrossHair_72613_wPhoto.png

On Sat, Apr 16, 2011 at 1:47 PM, Whitney R. Armstrong <whit at temple.edu>wrote:

>
> If the beam were coming in at an angle like in Oscar's plots, you'd
>> also think we'd see something in the cross-hair plots.  Here's an
>> attempt to show what I mean:
>> http://twist.phys.virginia.edu/~jdm2z/sane/cross-hair.png
>>
>> I haven't taken a close look at this, but here are a couple slow
>> raster plots from the 72700's super-imposed upon a picture of the
>> cross-hairs.  Neither of these show the cross-hairs shifted.
>> http://www.jlab.org/~sanetarget/sane%20pictures/target388.html<http://www.jlab.org/%7Esanetarget/sane%20pictures/target388.html>
>> http://www.jlab.org/~sanetarget/sane%20pictures/target389.html<http://www.jlab.org/%7Esanetarget/sane%20pictures/target389.html>
>>
>
> Here is the crosshairs for run 72613, which is in my tech-note. I have put
> two lines of equal length on the graph. They highlight the apparent
> asymmetric cup/crosshair geometry.
>
> It appears from the image that the crosshairs were not in the middle, but
> they were, as the photo shows.
> Also, the radiation damage to the bottom of the cup is consistent with this
> cross hair image showing the beam hitting something at the bottom.
> This could be due to the magnetic field being reversed.
>
> Cheers,
> Whit
>
>
>
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