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%TCIDATA{Created=Thu Dec 19 13:42:42 1996}
%TCIDATA{LastRevised=Mon Sep 08 14:46:00 1997}
%TCIDATA{Language=American English}
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{\Large Minutes of the Coordinating Committee of Hall A, August 28, 1997\\[%
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}
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\medskip
The Hall A Coordinating Committee (CC)\ meeting was held in Room A110, CEBAF
Center, at 2:00 PM. In attendance were Pierre Bertin, George Chang, Kees de\
Jager, Marty Epstein, Mike Finn, Jeff Templon, and Pascal Vernin. This was a
joint meeting of outgoing and incoming board members.
\medskip
\section{Results of the CC Election}
Pierre Bertin and Jeff Templon have been elected to replace outgoing
committee members Marty Epstein and George Chang. The CC\ would like to
thank Marty and George for the exceptional leadership they have provided to
the collaboration in the past two years.
The new committee has elected Mike Finn to serve as chair for the next year.
Jeff Templon was elected to act as its secretary.
\section{Hall A Status}
As the first item of business, Kees de Jager presented an overview of the
current status of the Hall. A synopsis of his report follows:
\subsection{Commissioning experiments}
Two commissioning experiments on $^{16}O$ using a waterfall target have been
completed.
E89-003 performed measurements of the $(e,e^{\prime }p)$ reaction in
quasifree kinematics. A missing energy resolution of about 1 MeV was
achieved. Systematic errors were controlled to the level needed to perform a
separation of the longitudinal and transverse response functions.
E89-033 performed the first observation of the polarization transfer
observables in the $(\overrightarrow{e},e^{\prime }\overrightarrow{p})$
reaction in a complex nucleus with $A\geq 2$. Running the polarized beam was
a steep learning curve from which other experiments will benefit. The M\o
ller polarimeter was partially commissioned during this experiment, but is
not yet fully operational.
\subsection{Scheduling for 1997-1998}
We are now in the end-of-summer shutdown. The primary activity during the
shutdown will be the installation of the cryotarget, which is needed to
carry out the remainder of the EXPINT program. The Hall A schedule for the
fall of 1997 begins with commissioning of the cryotarget. This will be
followed by the elastic deuteron form factor measurements of the $A$ and $B$
structure functions. At the end of the year, a one week dress rehearsal run
for the parity experiment will be undertaken.
The decision of the laboratory to run only 2 of the 3 Halls at a time for
the immediate future has had an impact on the schedule for next year. Halls
B and C will run in February of next year, extending the planned January
shutdown for Hall A. In March, the virtual Compton scattering experiment
will run. The first parity production run will occur next. This will be
followed in the summer by the $G_{Ep}$ measurements using the FPP. The
reordering of the Parity and $G_{Ep}$ measurements was necessary due to the
fixed schedule for installing the polarized deuterium target in Hall C. The $%
G_{Ep}$ experiment can run simultaneously with this Hall C experiment, but
the parity experiment requirements are not compatible with the
high--polarization source that will be used by the other two experiments.
Installation of the polarized deuterium target in Hall C will occur from
April to July. On July 1, the strained GaAs crystal will become available.
This crystal will allow higher beam polarizations but at the expense of
limited current. Four months of running with this crystal is foreseen.
The running of the $G_{Ep}$ experiment will complete the planned initial
experimental program proposed by the EXPINT committee. At this time the
schedule is not fixed beyond the summer of 1998. Kees indicated, however,
that measurement of the low $Q^{2}$ evolution of the extended DHG sum rule
using the polarized $^{3}He$ target would likely run in the fall. This
experiment has the highest PAC rating of the remaining approved experimental
program and can benefit from the use of the strained photocathode. (This
experiment was originally expected to run in the summer months). Finally,
the second parity production run would likely be scheduled to run about six
months after the first run.
\subsection{Commissioning of major pieces of equipment}
\begin{enumerate}
\item The Hall A Cryotarget installation has begun. All components are
ready. The fast raster system, required for use with the cryotarget, is
installed but not yet tested. Target boiling tests will be undertaken at the
beginning of October.
\item A solution for the higher power needed by the $^{3,4}He$ cryotargets
has not been finalized. Power is limited by the capacity of the end station
refrigerator. Replacement of the refrigerator with a more powerful one is
two years away. The choices are to either delay running experiments
requiring the higher capacity or to impose impacts on other competing
demands for cryogenic fluids. Moreover, $^{3}He$ gas is now on the strategic
list making acquisition difficult. The local DOE office is assisting with
the latter matter.
\item The $(e,p)$ energy measurement encountered problems with its trigger
electronics in its first test run. This should be fixed by October. They
expect to achieve $10^{-4}$ accuracy by early 1998.
\item To minimize the radiation load in the Hall, additional ion chambers
will be instrumented along the beam line. The operators will steer the beam
to avoid tripping the chambers (which will be incorporated in the machine
protection system).
\item The Compton polarimeter will be installed during the Jan-Feb 98
shutdown. The cavity needed to enhance the gain will be installed in fall 98.
\end{enumerate}
\subsection{Angle changing methods}
Improvement of the methods used to determine the spectrometer angles and
pointing accuracy are underway. The full vertical and horizontal alignment
systems will be installed during the January 98 shutdown. The elastic $%
d(e,e^{\prime })$ measurements scheduled for this fall do not have stringent
angle requirements. An intermediate solution based on the circularity of the
scattering chamber has been developed for this experiment.
\subsection{Arc magnets}
Pascal Vernin brought us up to date on the status of the arc method for
measuring the beam energy. New measurements of all eight arc dipole magnets
are needed if the goal of achieving a energy measurement of $2\times 10^{-4}$
accuracy is to be realized. Discussions are underway with the accelerator
division to see if time for a magnet calibration can be fit into the
schedule. No decision has yet been reached. In answer to a question as to
whether the $(e,p)$ measurement technique by itself would suffice, Kees de
Jager indicated that two independent measurements of the energy are required
to have full confidence in the result. {\it The CC reiterates its belief
that measurement of the beam energy to a accuracy of }$2\times 10^{-4}$ {\it %
is needed to carry out the experimental program in Hall A.}
\subsection{Staffing}
Kees de Jager announced that the recent job search has resulted in the
hiring of two new Hall A staff members, Eugene Chudakov and Olaf Hansen. A
new postdoc, Michael Kuss, has also recently been hired.
\section{Update on Graduate Student Thesis Projects}
George Chang reported on students assigned to thesis projects in Hall A.
Students committed to scheduled experiments include:
\begin{itemize}
\item E89-003: Brian Diederich(ODU), Juncai Gao(MIT), Nilange Liyanaga(MIT)
\item E89-033: Sergey Malov (Rutgers), Krishni Wijesooriya(W\&M)
\item E91-010: Bill Kahl(Syracuse), Johann Jardillier(Saclay), Wilson
Miller(Princeton), Gary Rutledge(W\&M)
\item E91-026: Cathy McCormick(ODU), Riad Suleiman(Kent State),
\item E93-027: Gilles Quemener(W\&M), Dan Zanea(Regina)
\item E93-050: Natalie Degrande(Gent), Stephanie Jaminion(Clermont),
Christophe Jutier(ODU), Geraud Lavessiere(Clermont), Luminita Todor(ODU)
\end{itemize}
A compete list of all collaboration students and their contributions to the
Hall is being prepared by Kees de Jager.
\section{Proposed New Collaboration Members}
Ph.D. Dissertation students who 1)\ have been accepted by the experimental
spokesperson for a dissertation project in Hall A, and 2) have made an
arrangement with the Hall A manager formalizing their contribution to the
Hall are automatically members of the Hall A collaboration. The students
listed above, with the exception of Degrande, Jardillier, and Jutier, have
met these two criteria. Students and their advisors that have not yet
formalized their laboratory commitments should meet with Kees de Jager as
soon as possible.
The CC plans to nominate several post docs for membership at the next
collaboration meeting. These include Rob van der Meer, Marios Kagarlis,
Michael Kuss, and Dave Prout. Van der Meer and Kagarlis of U. Regina are
working on the silica aerogel Cerenkov detectors and plan to work on the
HARP detector when it is shipped to JLab. Prout is the senior postdoc from
Kent State committed to E91-026 and is also working on the cryotarget. Kuss
is being nominated by virtue of his joining the Hall A staff.
In considering new members for nomination, the CC looks for specific
commitments being made to the program as a whole, such as the building of
equipment and software contributions, as well as active participation on
specific approved experiments.
\section{Official Membership List}
George Chang announced that the official collaboration membership list is
nearly complete. The list will be posted on the Web after the CC accepts it.
(The membership list is distinct from the Hall A mailing list which includes
all people expressing interest in the Hall.)
\section{New Web pages Planned}
Jeff Templon has offered to post a number of Hall A documents on the Web. In
addition to the membership list, he plans to post the Charter and CC minutes.
\section{Scheduling of Experiments}
The next deadline for beam time requests is September 9, 1997. Kees de Jager
reviewed the procedures the laboratory is using to determine which
experiments to schedule. Experimental spokespersons initiate the process by
submitting a request to schedule beam time. Based on the beam time requests
for their Hall, Hall Leaders make their priorities known at the JLab
Scheduling Committee. A draft recommendation is made by the Committee, which
is circulated for comments. After a 3-week review period the proposed
schedule is presented at the Users Group Meeting. The schedule is then
finalized.
The criteria that Kees de Jager uses for making his recommendations include:
\begin{enumerate}
\item PAC\ rating,
\item Equipment readiness,
\item Graduate student involvement and readiness, and
\item Experimental requirements.
\end{enumerate}
In response to a question regarding user feedback early in the
recommendation process, de Jager said he plans to distribute his proposed
recommendations to the Collaboration before meeting with the Scheduling
Committee.
\section{Publication Issues}
George Chang expressed concern over reports that members are not receiving
drafts of abstracts and other publications for review. The Collaboration
requires that speakers and authors for talks, presentation and papers about
the Hall A program be approved in advance by the CC, which must also review
in advance the content of any such presentation or publication. A loophole
is that ``presentations that are clearly about a specific experiment are
solely the responsibility of the spokespersons for that experiment.''
Spokespersons, however, clearly have the responsibility to consult with
their coauthors and the CC has a responsibility to see that contributors are
fairly acknowledged. {\it Therefore, the CC is asking that spokespersons
arranging for talks, presentations, or papers on Hall A Collaboration
Experiments submit a final draft of the abstract or paper to the CC for
comment in advance of submission. Spokespersons should then allow the CC a
minimum of three full working days to comment before submitting the abstract
or paper. Spokespersons are also reminded that they have a responsibility to
distribute any such communication to all their coauthors. For talks
crediting the ``Hall A Collaboration'' as a whole, notification of the
entire collaboration is also required upon submission. }
\section{Future of the Collaboration}
The Hall A Collaboration was originally created to oversee the design,
construction, and commissioning of the initial complement of equipment for
Hall A. As such, the Charter provides for a sunset clause which will take
effect after the completion of the recommended EXPINT round of experiments.
Kees de Jager, among others on the CC, sees a need for continuing the
collaboration, if only to provide for continuing user support for major
pieces of instrumentation. His vision is that the existing collaboration
evolve from an equipment based collaboration to a physics based one. He
would like it to continue to play a major role in development of new
directions for the Hall as well as development of new instruments for the
future. The CC agreed to begin looking at revisions of the charter needed to
ensure the continuing vitality of the collaboration. Members with
suggestions of how we may best proceed are urged to contact the CC.
Comments, ideas, and concerns are welcomed.
\section{Dates for the Next Collaboration Meeting}
The CC has set Nov 6-7, 1997 as the dates for the next collaboration
meeting. The collaboration meeting will begin at 1:00 PM the afternoon of
the 6$^{th}$. The next CC meeting will occur the morning of the 6$^{th}$.
The tentative agenda includes reports of the recently completed
commissioning experiments and the scheduled EXPINT experiments. The CC
encourages spokespersons considering significant modifications of older,
approved but unscheduled, proposals to present their plans at this meeting.
\medskip Respectfully submitted by J. Michael Finn,
September 5, 1996.
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