Subject:
Re: Run IIb L1Cal meeting this Thursday
From:
"Alan L. Stone" <alstone@fnal.gov>
Date:
Thu, 06 May 2004 03:43:24 -0500
To:
Hal Evans <evans@nevis.columbia.edu>
CC:
D0 Run2b L1Cal Trigger <D0-L1Cal2b@fnal.gov>

Hi,

I got started last week on understanding what is needed for the BLS to ADF
transition.  Thanks to Dan, I got nudged in the right direction.

I spoke with Johnny Green about ordering some parts and pieces for testing
and prototyping.  After going over most of the details, Johnny recommended
involving John Anderson.  John, Johnny and I met for a half hour last
Thursday morning.  I said I would like to have the patch panel/bulkheads
designed and built and sitting on the sidewalk by the end of the summer,
and they felt this was a reasonable goal.  Same for the extension cables
connecting the BLS to the ADF.

John prepared a work request form.  Johnny summarized the open questions
of which I was not certain of an answer, and I forwarded them to Dan.
Meanwhile, Johnny made up the requisition for 300 feet of the Madison
cable that Dan spec'd out for use as the extension cables.  We can study
the affects on the signal as it transitions from the existing blue BLS
cable to the new ADF extension cable.  This can go on in parallel to the
design of the patch panel/bulkhead.  If a problem is found with the cable,
this will impact the design.

I queried Terry Erickson about when we could expect the cable.  It is
a stock item, and we requested May 10 as a "need by" date.  One minor
but unfortunate hurdle was figuring out who could sign for the project
number.  That cost us two days.

For now, we are assuming that we can use FIVE full racks for mounting
patch panels/bulkheads which receive the existing BLS blue cables from the
front and the yet to be made ADF extension cables from the rear.  We may
only need FOUR.  Also, we are assuming that each ADF crate will get a rack
all to itself.  If anyone at anytime can think of why this would be a
problem, please let me know.  Such a layout will let us make shorter ADF
extension cables too.  Still need to figure out the maximum length...

I'll continue to log our progress on this web page:

http://www-d0.fnal.gov/~alstone/D0Work/L1CAL/l1cal.html

Alan