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<div class="moz-cite-prefix">Hi, <br>
<br>
I posted brief minutes of the HPS Slow Controls meeting on Monday,
September 16th at<br>
<a class="moz-txt-link-freetext" href="https://confluence.slac.stanford.edu/display/hpsg/2013.09.16+Biweekly">https://confluence.slac.stanford.edu/display/hpsg/2013.09.16+Biweekly</a><br>
<br>
Hovanes. <br>
<br>
<h2>Minutes</h2>
<p>Present at JLab: F.-X., Nerses, Stepan, Hovanes</p>
<p>Present at SLAC: Ryan, Pele, Sho</p>
<p>Hovanes announced that he is trying to find a better time for
the slow controls meetings for the fall semester. He setup<a
href="http://www.doodle.com/z7s2xrgr2vbgs73w"
class="external-link" rel="nofollow">a Doodle-poll to find the
optimal time</a> for the group members.</p>
<p>Ryan described the basic concept of how the low voltages and
the bias voltages for SVT will be controlled.</p>
<ul>
<li>Bias voltages will be directly controlled from MPOD y a soft
IOC running on a Linux server in the counting house.</li>
<li>The low voltages will be controlled both from both MPOD and
an CA-server running within DAQ. The boards on MPOD will set a
master voltage and will be controlled from the softIOC in the
counting house, while within the SVT DAQ system the voltages
will be multiplexed and can be controlled by changing values
of CA channels served by the DAQ.</li>
<li>Sho or Pele will send an e-mail to the group within this
week with a document or slides showing the exact number of
channels and groupings so that it can be discussed at the next
slow controls meeting.</li>
</ul>
<p>Hovanes showed an Excel spreadsheet with IOCs that will be
needed and their location for the HPS slow controls components
described so far. </p>
<ul>
<li>The IOC will be positioned at three locations: Pie Tower and
the Space Frame in Hall B, and the rack-room in the counting
house.</li>
<li>Stepan pointed out that minitorus (Frascati) magnet power
supply will stay on space frame so the only magnet power
supply controlled from the pie-tower will be the pair
spectrometer magnet power supply (main dipole).</li>
<li>Since almost all cables were removed, we will not gain much
by trying to keep the classc8 IOC on the Forward Carriage.</li>
<li>At the end we found that so far we need two VME crates on
the space frame (classc1 and classc3), two VME crates on the
pie tower (classc2 and classc8), and a Linux server in the
counting house for softIOCs (clonioc1).</li>
<li>Stepan suggested that we need to talk to accelerator OPS to
see if the beam-time accounting is going to be similar to
6-GeV accounting in order for us to keep the CLAS BTA setup.</li>
</ul>
<p>Stepan said that there is a big progress with ECAL motherboard
design.</p>
<ul>
<li>ECAL voltage grouping will be available by the end of this
week</li>
<li>DVCS CAEN HV mainframe will eventually need to move to the
pie tower for ECAL. The beamline will need another CAEN
chassis on the space frame. Hall B should have some for CLAS
and CLAS12.</li>
<li>The rack with the DVCS CAEN HV will be moved to the EEL
building where the ECAL is now such that it can be connected
to the network and can be used for the software development. <br>
</li>
</ul>
<br>
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