sPHENIX EMCal discussion

["Sickles, Anne M" <sickles AT illinois.edu>]

Hi John,

I agree your questions are good ones, but I was wondering what the timescale for hearing back on the EMCal options considered in the cost reduction exercise document.  There were a lot of big changes to the EMCal considered, but I don’t know which of them we will need to do.  Has there been any feedback?  I don’t think the EMCal group itself can provide an answer to your first question:

- Do we even test an eta=1 calorimeter?  No need to test it if we're not 
going to build it.

without that input.

Best,

Anne

On Jun 30, 2016, at 11:43 AM, John Haggerty <haggerty AT bnl.gov> wrote:

You probably saw a very similar post to the HCAL list... the questions
for the EMCAL are the same, only harder:

Very soon, we need to agree to changes in the "reference design" of the
calorimeters engendered by the descoping exercise.

In particular, I think the next prototypes we test should be as close to
the final design as possible.   In the case of the EMCAL, there are some
real questions that we need to answer very soon:

- Do we even test an eta=1 calorimeter?  No need to test it if we're not
going to build it.

- Do we test "2x2" towers?  Do we have 4 little light guides with a lot
of corners, or bigger light guides?  I could imagine a single stuby
light guide could result in more uniform light collection, but it's not
at all obvious.

- Do we design preamps that can take 16 SiPM's?  This is a thing that
Steve would have to test before we did it, and it would have to be moved
to the front burner if we want it for January.

- Projectivity.  Enough said.

With the substantial changes to the EMCAL we're talking about, we may
also wish to consider delaying our appointment with the FTBF a month or two.

Since not everyone attends every meeting, I think it's important that we
discuss this with a wide audience on the lists.  So fire away.

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
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Anne Sickles

Assistant Professor, Department of Physics

University of Illinois at Urbana-Champaign

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