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

[Hovanes Egiyan]

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://urldefense.proofpoint.com/v2/url?u=https-3A__photos.app.goo.gl_Q9To4SutT7854mmV6&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=-MwMW0sKroUIjy-Lh9rb3KzmWIgdcbbr9_jez8RLmto&m=NkMwwaoaUBgWwxZsMl8bZrVpWI2--3cseCUiSRuvp3jemr2BhLhci6l_yqd8WeTT&s=9kD-iPlHU_3sreIlCIgihFRcXV3-Cc4uIV0ibXDjLvw&e= 
> 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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