[Hallc] Pion-LT update

[Garth Huber]

Dear Collaborator:

We are writing to give another update on the Pion-LT experiment (E12-19-006)
"Study of the L-T separated cross section at 11 GeV and measurement of the
charged pion form factor to high Q^2", and seek your continued support in
helping to fill shifts to run the experiment.  This is an important experiment
that has motivated the 5.50 degree capability of the SHMS, and has been
identified as an "early high impact experiment" by the JLab PAC.

We have successfully completed the first three parts of the fall 2021 run plan,
with 9172, 5984 and 9878 MeV beam energies.  The run has gone quite well so
far, and two important Hall C technical milestones were successfully met,
including the first data taken with the SHMS at 5.495 deg, and the first data
taken with the minimum SHMS+HMS opening angle of 18.00 deg.  Last Wednesday,
Nov 24, we transitioned to our final beam energy, 7937 MeV.  A webpage of our
data taking progress, including plots from the initial physics replays of all
data acquired to date, is available on the Hall C wiki at:
https://hallcweb.jlab.org/wiki/index.php/PionLT_2021_Physics_Status

JLab released a revised 2022 beam schedule last week.  After stopping beam for
the holiday break on Dec 20, we will now resume 7937 MeV data taking on Jan 16
and continue the experiment until the morning of Feb 8, 2022.  Phase 3 of the
E12-19-006 data taking, primarily for the high epsilon parts of our many
physics settings, is now scheduled for Oct 1-Dec 3, 2022.

The experiment still has a lot of shifts to fill between now and Feb 8.  The
shift requirement for co-authorship is 15.  While our preference is for
co-authors to take 10 shifts in this 2021-22 run, followed by another 5 shifts
in the fall 2022 run, we understand this is not always possible.  If you prefer
to take all of your shifts in either 2021-22 or fall 2022, just please let us
know, so we can include this in our experiment planning.

The shift schedule can be found here:
https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?experimentRu
nId=HALLC-PIONLT

Thanks and Regards,
Garth, Tanja and Dave

-- 
Dr. Garth Huber, Dept. of Physics, Univ. of Regina, Regina, SK S4S0A2, Canada.
tel: 1-306-585-4240. fax: 1-306-585-5659.