PENN ARRAY TELECON

06jun03

ATTENDANCE

Penn:  Mark Devlin (late), Simon Dicker, Mark Supanich
GB: John Ford, Brian Mason, Roger Norrod

Agenda
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1) Discuss Simon's list of issues

   -Cryostat design/mounting
   -New Helper with electronics at Penn (Mat Cohn)
   -cold head power supply mounting questions

2) GB update

   -summarize strategy for software
   -discuss the plan for making progress
	on mechanical interfaces
   -discuss the project meeting
   -where are we WRT CDR?

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-Simon had a number of detailed questions about the dewar.  Penn will
come up with final drawings to the extent possible, and GB will use
this to suggest a mounting strategy including mount points.  Simon
aims to deliver these drawings to GB next week (ending Fri 13jul).  An
updated weight budget will also come at that time, including things
like lenses, PTC, cold head powersupply, etc.

-The new silicon lenses have changed the internal optics somewhat
(principally the optics box) but this doesn't affect the GB/Penn Array
interface.  Penn is working on finalizing this aspect.

-The cold head power supply could possibly be put in the RFI donut
atop the Rx/Rx room roof.  Operating temperature is an issue that
needs to be looked at; heating or cooling may need to be accomadated
in the design in this case.

-Mark S. has about finished the specification of the (non-NIST)
electronics, and has updated the drawing.  GB will review this
drawing, provide info on the cal switch fiber control scheme, and
verify that we have room in an existing RF cabinet on the floor for
the computer and other components that go there.

-The Digital Electronics Box is at princeton, and Penn will be
visiting next week.  Mat will be working to understand the DEB and its
software interfaces, and he will take on the task of documenting what
it does so GB can write the online M&C software.  GB will provide some
templates and guidance as to what we need documentationwise.  

-Mat will start off by documenting the cryogenics controls.

-Penn will bring to a more final state the optics documentation and
send this off for review (probably by Bill Duncan) prior to the CDR.

-We seem to be a couple months from the CDR.  This doesn't seem to be
a problem.  We need at this point to focus on getting the design
squared away (components that can't be final by CDR need serious
scrutiny as to the envelope).  A project meeting (below) was thought
to be a good idea.

-The schedule was discussed.  Two important points were raised.  1) We
should assess the lead time in our (GB) machine shop, eg, "If Penn
delivers drawings on XX Jul, when can we get the dewar delivered?" is
this critically dependent on the value of XX? 2) BLAST filters are
running 8 months late, and this is a possible concern for the Penn
Array-- in both cases the "vendor" is Cardiff.  If a hard look at the
schedule warrants it, we may need to consider a waiver to order the
filters, lenses, and coatings before the CDR, possibly based on a
mini-review.

-We agreed that 2&3 Jul is a good time for a project meeting in
GB. Mark would like to go to the receiver room at this time, and we
will make every effort to accomadate that.  This will be a good chance
to review the design and make sure we are on track for everything to
fit together.