[Tdis] [EXTERNAL] Fwd: question on C12-15-006

[Dipangkar Dutta]

Hi Everybody,
Here are the questions from the reader. I will start an overleaf
document and start populating the answers.
 We may need to have a meeting on Wednesday to discuss the answers.
Cheers
Dipangkar


---------- Forwarded message ---------
From: Geralyn Zeller <gzeller at fnal.gov>
Date: Mon, Jul 17, 2023 at 8:50 AM
Subject: question on C12-15-006
To: d.dutta at msstate.edu <d.dutta at msstate.edu>
Cc: markus.diehl at desy.de <markus.diehl at desy.de>, mcontalb at fe.infn.it
<mcontalb at fe.infn.it>


Dear Dipangkar,



Thank you for the update to CR-15-006: Measurement of Tagged Deep
Inelastic Scattering. In preparing for PAC51, we are hoping you and
your colleagues on TDIS could also kindly respond to the following
questions:



How has the TDIS collaboration evolved since this experiment was first
proposed to today? Have there been any significant changes to the
number of institutions, staff, or prospective students?



Could you please say more about the needs and plans for the additional
33 days of operations? Specifically:

For the 13 day engineering run, it is understood that the beam
luminosity will be increased in stages. How many days of running are
needed at each stage? How will the optimal luminosity be determined?
For the additional 20 days of running to support pion and kaon SF
measurements, how was the duration of 20 days arrived at? What
improvement in physics measurement capability is expected with 20
additional days of data-taking? Is it possible to couple this
additional 20 days to a quantitative measure of added physics
performance?



The detector redesign and associated prototyping effort that has taken
place since the experiment was first proposed is both impressive and
important. What is the approximate expected timeline for obtaining
results from the two detector prototypes? The first detector prototype
will take data in Hall A at JLAB and at Fermilab this fall: what about
the second prototype? When is it expected to be operated and where?
Could you please comment on roughly when you expect to have results
from this full complement of detector prototypes?



We note that the previous PAC commented that the choice of a 4.7 T
solenoid magnetic field may not be optimal for the lowest momenta
recoil protons. How has this been addressed? Has the performance for
low momenta protons in this B field been studied in simulation?



It is mentioned in the update that new developments in TDIS theory
since 2015 have resulted in an expected increase in the TDIS signal
yield. Could you please give a rough sense of how much larger a signal
rate is expected based on these new developments?



Thank you for providing links to the white and yellow papers, but is
it possible to please elaborate on the ~50 new publications that have
bolstered interest in the TDIS run group of experiments: is it
possible to provide a list of these publications?



Thanks and looking forward to your presentation on the 26th,



Sam Zeller

Senior Scientist

Deputy Project Director for LBNF/DUNE-US Near Detector



LBNF/DUNE-US Division

Fermi National Accelerator Laboratory

(630) 840-6879 office