<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>Minutes are online at <a href="https://halldweb1.jlab.org/wiki/index.php/January_16,_2013_Tracking_CDC/FDC">https://halldweb1.jlab.org/wiki/index.php/January_16,_2013_Tracking_CDC/FDC</a></div><div><br></div><div>Text below</div><div><br></div><div><p>Present: Curtis, Naomi, Beni, Simon, Lubomir, Eugene, Mark
</p>
<ol><li> Collaboration meeting
<ol><li> 3 talks have been reserved for tracking
</li></ol>
</li><li> FDC Update
<ol><li> Last production package (#2) assembled. Gas pressure lower by
10-20% than in the other packages at the same flow, could be due to the
new manifolds since no gas leak was found.
</li><li> Package #4 is being tested at JLab. It held the nominal HV
right from the beginning without any trips. Beni: all the wires and
strips already tested and working fine except 4 strip channels showing
somewhat lower signals.
</li><li> Decided to build 6 spare cells. Will chose 6 wire frames out
of 7 with some of them showing elevated dark current. We have also the
material for 12 cathodes.
</li></ol>
</li><li> CDC Update
<ol><li> CDC construction has been stalled pending the arrival of the
transfer ring (STOP PRESS the shipment of this was authorized this
afternoon - wahoo!)
</li><li> Naomi measured pedestal widths of the HVB & preamp
combinations inside a grounded metal box and found that the pedestal
width of the original HVB and preamp4 was only 2 fADC units, after
altering the HVB to attenuate the input charge to the preamp and later
removing the preamp's terminating resistors to match its range to that
of the fADC we now have a pedestal width of 15 fADC units, before adding
any pickup from the chamber (pickup from the prototype now adds only
1-2 fADC units). The increased pedestal width was not so obvious at the
time because the noise from the prototype was dominated by pickup from
the thermocouples (since removed).
</li><li> Eugene requires an estimate of CDC completion date and costs
to completion. CMU's contract needs to be extended to allow the CDC to
be tested at CMU until Hall D is ready to receive it (probably in
August). Testing was included in the original contract but the original
delivery point is April.
</li></ol>
</li></ol><div><br></div></div><div><br></div><div><br></div><div><br></div></body></html>