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Hi Sascha:<br>
<br>
we had a discussion yesterday during our Calorimetry Working Group
meeting about the equipment that would be needed for a BCAL beam test in
Hall B (in the event that we manage to pull this off before shutdown).
Someone mentioned that you had looked into the issue of electronics and
that enough flash250 boards, etc, should be available and that a second
DAQ could be set up, in the event that the FCAL is still taking data.<br>
<br>
I would like to get this discussion rolling since we need to plan ahead
of time to get everything in place.<br>
<br>
We are thinking of fully instrumenting the BCAL Mini Cal, with 80 SiPMs
plus their electronics. I am not sure if cooling is possible in Hall B
(Elton and Tim may answer this). We plan to add a few 5 -10(?)
scintillators as triggers, using PMTs (we need to check stray fields in
alcove -- floor should be ok). I am assuming that Fernando and Tim will
provide us with a setup including the summing (into towers) boards, to
mimic the eventual experiment. In that case, we know the number of ADC
and TDC channels we need, although for this test I would like us to
instrument the outer layers with the F1TDCs. Ditto for discriminators, I
hope. We, will of course, need the crates for these, trigger module,
etc all the way to the online software. <br>
<br>
It is not clear to me who will do all this. We at Regina will do all
the offline software for analysis, and we will have people down for
setup and data taking. We need to discuss all these things starting
next Tuesday morning during the readout meeting.<br>
<br>
John says that the updated schedule in Hall B will have some small
installation time in early March. If this is the case, we should
discuss how to take advantage of this. One scenario has us use that
time to at least get cables and electronics in place, even if the SiPMs
are not ready. Once the Mini Cal is ready (everything can be mounted on
it, say, in the ESB and then moved as one piece into the hall and
quickly cabled. Such a scenario might require access to the hall for a
few hours (1-2 if all else is in place), to position and cable it.<br>
<br>
The starting point could be the alcove, as the FCAL should be out on the
floor by then. If we have 5 pass beam, at 5% in the alcove we'll get ~
275MeV e- in the Mini Cal. On the floor at 5 pass we'll get 1.8 GeV at
the 30% location. If we have time we can consider going further up in
energy.<br>
<br>
All these things need to be discussed.<br>
<br>
Finally, but most importantly, we need to get a proposal done to be
submitted by Eugene to Volker. I will work on this. Fortunately, much
of the hard work has been done be Indiana and their proposal will be
used as a reference. And I know there is other paperwork as well: TOSP,
ESAD, RSAD, but we can probably just tweak the <a href="https://halldweb1.jlab.org/wiki/index.php/Beam_Test_Run_Plan#Safety">2006
ones</a> to reflect the tagger alcove and floor (as opposed to the beam
dump area alcove in 2006).<br>
<br>
There is much more, but I better stop here. I'll have this item on the
Feb 7 BCAL Readout meeting. I am hoping for a good attendance.<br>
<br>
Cheers, Zisis...<br>
<br>
P.S. The Wiki page for all this is at:
<a href="https://halldweb1.jlab.org/wiki/index.php/BCAL_Beam_Tests_2012">https://halldweb1.jlab.org/wiki/index.php/BCAL_Beam_Tests_2012</a><br>
<br>
<div class="moz-signature">-- <br>Prof. Zisis Papandreou, Ph.D.,
P.Phys.<br>
Department of Physics | tel.: (306) 585-5379<br>
University of Regina | fax.: (306) 585-5659<br>
Regina, SK S4S 0A2 | email: <a href="mailto:zisis@uregina.ca">zisis@uregina.ca</a><br>
Web: <a href="http://web.me.com/zisis/professional/">http://web.me.com/zisis/professional/</a></div>
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