[Halld-offline] [Halld-online] [New Logentry] CDC straw positions shifted in phi

[Richard Jones]

Hello David, Naomi, Curtis

I have attached a view of the CDC straws, as currently defined in hdds. The
red dots label straw #1 in each ring. The cut was taken through the
approximate midplane of the CDC at z=90cm, and the view is taken looking
from the downstream end of the CDC. I don't see how any of these labels can
be off by 5 straws in any layer, unless the numbering was assigned to start
from 1 at the upstream face??? Based on this image, can you tell me how to
shift each layer to get the numbers consistent with the electronics
diagrams?

-Richard Jones


On Fri, Jun 27, 2014 at 5:10 PM, <davidl at jlab.org> wrote:

>    CDC straw positions shifted in phi
> <https://logbooks.jlab.org/entry/3288879>
>
> Lognumber 3288879 <https://logbooks.jlab.org/entry/3288879>. Submitted by
> davidl <https://logbooks.jlab.org/user/davidl> on Fri, 06/27/2014 - 17:08.
>
> Logbooks: HDBCAL <https://logbooks.jlab.org/book/hdbcal> HDCDC
> <https://logbooks.jlab.org/book/hdcdc> HDLOG
> <https://logbooks.jlab.org/book/hdlog>Tags: Analysis
> <https://logbooks.jlab.org/tag/analysis> Detector
> <https://logbooks.jlab.org/tag/detector>References: 3288617 - BCAL, CDC
> cosmic events <https://logbooks.jlab.org/entry/3288617>
>
> The combined BCAL/CDC cosmic run showed small issues with the alignment of
> both the CDC and the BCAL. The BCAL was rotated by 1/2 module w.r.t. what
> was in the software. This has since been fixed and is now corrected in all
> of the pictures below. The CDC stereo straws were also indicating problems
> since many tracks had stereo wires not crossing the track itself. This was
> tracked down by Naomi, Curtis (with some help from Simon) to be straw
> numbering issue where many of the layers had straw 1 in the software
> shifted by ~5 wires.
>
> This was fixed in the XML and the results are shown in the pictures below.
> These show 2 different events with a before and after version. The fix is
> not yet committed to the repository due to changes committed just recently
> (today) relating to the GEANT4 effort. Once those changes have been
> resolved with this fix, that will be checked in and made available as well.
>
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>
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