<div dir="ltr">Beni and all,<div><br></div><div>Granted 400ps is not great, but I think we can do a lot better using the design we talked about yesterday because:</div><div><ol><li>we will have both a tdc and adc for timing</li><li>we will have 2 channels of wavelength-shifting readout per column instead of 1</li><li>we will also have direct blue light with much faster rise time on readout rows 2-4, albeit with lower photon statistics</li></ol><div>In summing mode all 5 channels will be summed in analog to form the pulse, but the blue light should increase the rise time of the leading edge assuming any of this light reaches the SiPMs.</div></div><div><br></div><div>-Richard</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Oct 17, 2025 at 8:30 AM zihlmann <<a href="mailto:zihlmann@jlab.org">zihlmann@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
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<div><font size="2">Hi Richard,<br>
you can make your own conclusions by looking at the two attached root files.<br>
TAGGER1_ps_test.root for the tagger microscope histogram 2d tagmTmRF<br>
and project any x-channel to the vertical axis and fit the prompt peak. even<br>
for the good columns the resolution is not better than 400ps.<br>
hdroot_PS_run133180 take 2d histogram psDTpsc and project any x-channel<br>
to the vertical axis you get better than 400ps. And remember, the ps tiles<br>
do not have TDCs, the time comes only from the fADCs.<br>
<br>
cheers,<br>
Beni<br>
</font><br>
<div>On 10/17/25 07:31, Richard T. Jones wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Beni,
<div><br>
</div>
<div>Yes we are around 400ps rms in the TAGM now, but as Hovanes says it was closer to 200ps when the device was first installed. This shows the degree to which its light output has now degraded. But I think the PS coarse counters were always at this same level
of 400-500ps.</div>
<div><br>
</div>
<div>-Richard J.</div>
<br>
</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Oct 17, 2025 at 6:48 AM zihlmann via Halld-tagger <<a href="mailto:halld-tagger@jlab.org" target="_blank">halld-tagger@jlab.org</a>> wrote:<br>
</div>
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<div><font size="2">Hi Hovanes,<br>
with my naive plugin looking at tagger time minus RF time I see a sigma of about 400ps.<br>
nothing sophisticated to optimize the result.<br>
I see similar sigmas for the PS tiles times where I use the PS coarse counters as time reference.<br>
Also, the PS tiles do not have TDCs only fADCs.<br>
<br>
cheers,<br>
Beni<br>
</font><br>
<div>On 10/16/25 19:02, Hovanes Egiyan wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi Beni,
<div><br>
</div>
<div>Thanks for the nice pictures. </div>
<div><br>
</div>
<div>GlueX NIM paper quotes 230ps for the timing resolution for TAGM.</div>
<div><br>
</div>
<div>Best, </div>
<div> Hovanes. </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Oct 16, 2025 at 4:06 PM zihlmann via Halld-tagger <<a href="mailto:halld-tagger@jlab.org" target="_blank">halld-tagger@jlab.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div><a style="color:rgb(0,0,0);font-family:"Times New Roman";font-size:medium;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:normal;text-decoration-style:initial;text-decoration-color:initial"> </a><a style="color:rgb(0,0,0);font-family:"Times New Roman";font-size:medium;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:normal;text-decoration-style:initial"> <br>
Hi All,<br>
<br>
I added several more pictures and "movies" to the photo album of the tagger microscope:<br>
https://photos.app.goo.gl/Q9To4SutT7854mmV6<br>
I highlighted a few points with three picked out pictures (see attached pdf file)<br>
With the green laser shining into the front face of the scintillator one can nicely see<br>
where the "losses" are in the fiber front face, in the fused section and along the light guide.<br>
<br>
In addition, I looked at the timing resolution of the pair spectrometer tiles and I find in <br>
my quick and dirty approach very similar timing resolutions as for tagger microscope<br>
of order 300ps.<br>
<br>
cheers,<br>
Beni<br>
<br>
<br>
<br>
<br>
</a></div>
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