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

[zihlmann]

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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