[Halld-tagger] [EXTERNAL] Re: microscope pictures with green / blue laser

[zihlmann]

Hi Hovanes,
with my naive plugin looking at tagger time minus RF time I see a sigma 
of about 400ps.
nothing sophisticated to optimize the result.
I see similar sigmas for the PS tiles times where I use the PS coarse 
counters as time reference.
Also, the PS tiles do not have TDCs only fADCs.

cheers,
Beni

On 10/16/25 19:02, Hovanes Egiyan wrote:
> Hi Beni,
>
> Thanks for the nice pictures.
>
> GlueX NIM paper quotes 230ps for the timing resolution for TAGM.
>
> Best,
>     Hovanes.
>
> On Thu, Oct 16, 2025 at 4:06 PM zihlmann via Halld-tagger 
> <halld-tagger at jlab.org> wrote:
>
>
>     Hi All,
>
>     I added several more pictures and "movies" to the photo album of
>     the tagger microscope:
>     https://photos.app.goo.gl/Q9To4SutT7854mmV6
>     I highlighted a few points with three picked out pictures (see
>     attached pdf file)
>     With the green laser shining into the front face of the
>     scintillator one can nicely see
>     where the "losses" are in the fiber front face, in the fused
>     section and along the light guide.
>
>     In addition, I looked at the timing resolution of the pair
>     spectrometer tiles and I find in
>     my quick and dirty approach very similar timing resolutions as for
>     tagger microscope
>     of order 300ps.
>
>     cheers,
>     Beni
>
>
>
>
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