[Halld-tagger] [EXTERNAL] Re: Beamline meeting today 10am

[Richard T. Jones]

Beni and all,

I just looked back in our records, and verified that the NIM article is
correct, the material we are using in the TAGM is:

   1. BCF-20 green scintillator for the scintillator fibers
   2. BCF-98 clear fiber for the light guides

I was mistaken in my claim that we were using BCF-92 for the scintillating
fibers.

That makes it more mysterious to me why the fibers have shown such a marked
decline in light yield with radiation dose, as compared with blue
scintillator that should be more sensitive to radiation damage. I have to
look further into this.

-Richard


On Thu, Oct 23, 2025 at 6:49 AM zihlmann via Halld-tagger <
halld-tagger at jlab.org> wrote:

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> Hi All,
>
> We will have a beamline meeting this morning at 10 am to continue our
> discussion of the tagger microscope status and plans and most importantly
> take decisions in preparation for the next run period.
> A wiki page can be found at
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__nam10.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Fhalldweb.jlab.org-252Fwiki-252Findex.php-252FBLTWG-5FMeeting-5F10-252F23-252F2025-26data-3D05-257C02-257Crichard.t.jones-2540uconn.edu-257C3a260bd98eae4331b05e08de1221d301-257C17f1a87e2a254eaab9df9d439034b080-257C0-257C0-257C638968133658451066-257CUnknown-257CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ-253D-253D-257C0-257C-257C-257C-26sdata-3DjKt-252Fqdtd2S9eTNdvSkv0L1ItxM71-252ByuqvJl4E2GBEiY-253D-26reserved-3D0&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=-MwMW0sKroUIjy-Lh9rb3KzmWIgdcbbr9_jez8RLmto&m=BJtBuntB7A5xb0d04tdMIPm3r_leWN0Pj8Uczk1xpSU-f-8XYjdJ_dllf4rKMyNj&s=9Ajaswm6jicH75ihUZayqohZ_YX9FBpAXpoXr94vgjI&e= 
> and we’ll meet in F326 for those at JLab.
>
>
> cheers,
> Beni
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