Re: tagger field map

[Richard Jones <richard.t.jones@uconn.edu>]

Sascha,

Could you shift the magnets and the map in the gxtwist geometry to agree 
with the new positions?  The map is placed using the Regions tag in the 
hdds geometry document.  The hardware and the map should be shifted 
together.

Richard Jones


Alexander Somov wrote:
>
> 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.