Friday, June 2nd

Chamber Response Group:

I've scheduled the first phone meeting of the Chamber Response Group for
this coming Monday, June 5th, from 1-2 pm CDT (11 am in Vancouver), and the
second for Monday, June 12th, at the same time.  This coming Monday, we will
go over and flesh out the list of topics we need to consider that I e-mailed
a few weeks ago (see below).

I've talked to the Telecommunications Office on campus and learned how to
arrange a "Meet Me" conference call, in which each of you calls into a
common phone port from wherever you are.  Thus, you will be responsible for
your own long-distance charges, while Texas A&M will pick up the
conferencing cost.

Everyone (except me) needs to call 1-979-847-9185.  You will hear a sound
that was described to me as "bong-bong", after which you should be
connected.  The phone port can handle a total of eight separate lines.
Since we have precisely eight group members, it isn't essential for the
TRIUMF participants to use one of the conference phones, though you may
choose to for cost and/or convenience reasons.

Please let me know if you will be unable to participate this coming Monday.
That way, we'll know when everyone has called in and we can start the
discussion.

Carl



Here is a cut-and-paste from my May 15th e-mail:


Our initial assignment is to figure out what aspects of the chamber response
need to be determined and how we are going to do so.  I take that to mean:
   a)  what measurements (with and/or without beam) do we need to make?
   b)  do these measurements require any "special" hardware?
   c)  what on-line software do we need to be certain the measurements we
       make are what we need?
   d)  what off-line software do we need to convert the measurements into
       the physics results we need?
We need to worry about both the information needed to analyse data and that
needed to insure that our Monte Carlo is as realistic as possible.  We need
to develop answers to these questions for both the November engineering run
and the Spring, 2001, physics run.  Then we'll need to move on to making
certain the necessary on-line and off-line software (and possibly hardware)
is ready by the appropriate run time.  In fact, I received an e-mail from
Maher today indicating that the software group would like an initial interim
report from us on our needs as soon as possible.

To get things going, we need a list of topics to consider.  A quick start is:

1.  Distance vs. time (and angle).  We will need to determine the d vs. t
relationship with the magnet on in order to do any tracking.  However, we
will certainly need to determine it with the magnet off, too, as a service
to the alignment working group.  We will also need to understand how the
drift distance resolution depends upon distance and angle, again both with
and without the magnetic field.

2.  What cross talk exists for muon hits?  For positron hits?  Is the cross
talk a function of the number of real hits on a given
preamp/amp-discriminator/plane?

3.  What inefficiencies occur for muon hits?  For positron hits?  What
inefficiencies occur for the positron tracks due to the previous muon hits?

4.  What random noise is present in the system?

Unlike item 1, I think we can get away with determining items 2,3,4 only
with the magnet on.  However, if any of you can think of a reason why we
need these with the magnet off, please send it to the chamber response
mailing list.  Furthermore, when you think of additional items to add to the
list, send them to the chamber response mailing list, too.

I think we are going to need preliminary determinations of all of these
items during the November run, so our analysis codes can be exercised with
realisitic Monte Carlo simulations prior to the physics run next Spring.
Unfortunately, we are only going to have drift chambers in the beam this
November, so we won't be able to investigate the response of the MWPC's
experimentally until next Spring.  C'est la vie....

+-----------------------------------------------------------------+
| Carl A. Gagliardi                                               |
| Cyclotron Institute              Phone:   (979)  845-1411       |
| Texas A&M University             FAX:     (979)  845-1899       |
| College Station, Texas  77843    E-mail:  cggroup@comp.tamu.edu |
|                                                                 |
| NOTE:  New 979 area code effective Feb. 19, 2000                |
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