E614 Collaboration Meeting
       April 24-25, 1998
       TRIUMF Auditorium.
NOTE - Decisions are marked by #  #

 A. Results of Monte Carlo analysis.
    Dennis described Monte Carlo results for studies of possible DME
buffer zones, the question of Field wires/no field wires, his 464
proposal, resolution in a non-uniform B field and a summary of past
results re muon tracking.
    Anuj described his recent work on muon ID and muon tracking (spin
optimization) and the need for a special detector for the latter.


 #1. The 464 proposal decision ==> construct the chamber array with
this type of arrangement. Consider going to a modified version as
follows;

    Pair  Following  Gap distance   Gap distance
           Gap Size  to pair N+2    to pair N+4
            (cm)        (cm)           (cm)
     1      4.0         10.4           20.0
     2      6.4         10.0           20.4
     3      3.6          9.6           20.8
     4      6.0         10.4           21.2
     5      4.4         11.2
     6      6.8         10.8
     7      4.0
     8
 Availability of glass spacers must be assured. Monte Carlo of this type
of arrangement should be done.#

 #2. Muon tracking detector decision ==> It is necessary! Continue the
design studies.#

 B. A trigger scheme.
    Jean-Michel described a new trigger scheme in which he proposed a
scintillator to replace the SiLi. He also proposed a gas volume to
replace the absorber. The gas mixture would be varied to change the
effective thickness of this degrader.
    Jean-Michel also described how stopping pions in these
scintillators would be sources (upstream and downstream) of 70MeV/c
positrons that would traverse the entire chamber array for calibration
purposes. Dave suggested that the "surface" muons from these pions
would stop in the stopping target where they could provide an
unpolarized decay spectrum (equal numbers from both directions.

 #3. Scintillator scheme decision ==> Great idea, adopt after testing
done.#

 #4. Monte Carlo gas degrader, pion stopping calibration scheme and
pion stopping as source of unpolarized spectrum.#

 C. Results from chamber test Data Analysis.
    Maher described his analysis work of the chamber test data,
including the use of Garfield for dtr calibrations, an initial
tracking scheme, wire mapping, chamber efficiencies, and the influence
of having no field wires.

    Grant commented on what he had been able to achieve re the test
stack noise problems. 

 #5. Field wires/no field wires decision ==> All information are
favorable to chambers with No field wires, therefore chambers will be
constructed without field wires.#

 D. Mechanical Design considerations.
    Pierre discussed plans for motherboards to support the preamps,
arrangements for DME gas containment, helium gas containment, and for
lamel manufacture in multiple pieces. He also described a scheme for
signal extraction to the preamps, to the postamp/discriminators and
then to the TDC/ADC's

 List of decisions;
        Subject           Decision
     Stack alignment       Hmm        New idea emerging
#6.  Lamel split           Yes
#7.  Anode signal          Yes        Soft-K cable.
      extraction                       = Kapton with strips.
     DME containment       Hmm        RTV vs DME test to come.
#8.  DME injection         Yes        Straw mounted from G10 support.
#9.  Motherboard design    Yes
#10. Motherboard support   Yes
     Signal extraction     Hmm        Cabling route & costs?
       from preamps
#11. Helium containment    Yes
#12. HV configuration      Yes        Anodes at voltage.
#13. Test pulse system     Yes        fire middle cathode plane.#


 E. Gas System
    Robert discussed the helium diffusion tests and the required flow
rates for DME and helium. These results 
    Robert also described a scheme for monitoring of the temperature
and pressure of the gases. He also discussed a plan for recycling the
gases to reduce costs.
 #14. DME buffer zones decision ==> no buffer zones are required to
prevent helium diffusion into the chamber gases. More Garfield studies
are to be completed re the maintenance of flatness of the cathode
foils.#

 #15. Design of gas system ==> The design work is proceeding well,
it should continue.#

 F. Electronics
    John S. discussed how the conclusion was reached that the VTX &
KIAE combination was our 1st choice.

 #16. VTX & KIAE decision ==> The collaboration agreed that this
combination was our 1st choice and that we continue to pursue the
"free" VTX and finalize the KIAE design work.#

 G. Chambers Construction program.
    Vladimir reiterated his earlier estimate that it will take two
years to manufacture the complete chamber array. The present goal is
to begin this manufacture in earnest in October.
    Vladimir also discussed the question of Central PCs vs no PC's at
the target. A decision on this issue involves several issues, one
being the possibility of changing the target. He described a scheme
for accomplishing this with the PC's in place.

 #17. Target changing scheme with PC's in place ==> rejected because
it introduces too much material. There remains a need for a scheme for
changing targets in either case PCs or no PC's.#

    Vladimir also discussed the number of outer PC's which provide the
first guess on time zero for positrons. He requested that the number
of planes be increased to four.

 #18. Number of outer PC's ==> Increase outer PC number to 4 planes.#

 H. Magnet
    John M. described the box vs cylinder shield design possibilities
and the latest cost estimates for same.

    Peter discussed the upstream vs downstream opening (for chamber
servicing) of the spectrometer and the various options for
"suspending" the chambers within the magnet, cantilevered vs on
rails. A long debate ensued.

 #19. Upstream vs downstream opening ==> Magnet and shield must remain
aligned to beam line and chambers will therefore be extracted by
moving(or removing) back shield plate.#
 #20. Suspending scheme ==> Rails need more investigation, in
particular the possibility of using a tubular support for rails.#

 I. Software issues.
    Renee stated that at this time MIDAS appears to be the best option
for the data acquisition system.
    Maher discussed the future needs and plans for the analysis
software.
    Dennis described where the Monte Carlo Code needed work and workers.

 #21. Data acquisition for E614 ==> MIDAS will be employed for this
purpose.#

 J. The muon beam.
    Nate described the status of the M13 beamline Monte Carlo. There
are several options to be considered and still a significant amount of
Monte Carlo work to be done.
    Dennis described improvements in the GEANT calculation of pion
production by protons (< 1 GeV) that he is installing. The resulting
angle and energy distributions of the pions are very different than
those generated by GHEISHA.
    Dave discussed the upcoming study of the M11 surface muons. The
initial search/flux measurement will be made in the 2 week period May
20 to June 3.  The polarization vs RF determination will be done in
the early weeks of July, July 1 to July 14.

 K. Physics.
    Dennis described the need to determine the muon depolarization in
helium experimentally. The depolarization in a longitudinal field has
never been measured for fields in the several Tesla region. He
presented an experiment designed to make this measurement but
concluded that it would have to wait until a larger diameter magnet is
available. The E614 magnet would seem to be ideal.
    Dave presented a list of systematic studies that could be
undertaken with the upstream half of the chamber assembly. He argued
that the chamber assembly should be scheduled so that this half of the
array can be put into operation while the downstream half of the
chamber is being completed.

 #22. Chamber construction schedule ==> The upstream half of the
chamber will be assembled as soon as possible. Construction of
chambers for and assembly of the 2nd half will begin when this has
taken place.#

 L. Collaboration Business.
   There is need for a policy on;
      New collaborators(Commitments = Acceptable  %'s)
      Publications - what can be said in conference papers.
      Students - assigning of thesis projects.

 #23. Policy needed decision ==> Spokesmen/Institutional coordinators
will describe a policy.#

 #24. Making decisions between collaboration meetings ==> a conference
call
capability for E614 will be established.#

   A Detector Review panel will be assembled and the meeting for this
purpose will be convened in December (~Dec. 3rd).

 #25. The next collaboration meeting will be held in the 1st two weeks
of October. Documents destined for the detector review submission will
  be discussed at this meeting.#

  A session of team building was then held during which the list of
tasks presented below were undertaken as indicated by the various
institutions involved in E614:

      Subject              Task                     Institution

  Analysis code        Installation of               Regina
                       helix fitting.

                       Garfield inputs               Regina

                       Graphic event display         Valparaiso


  Monte Carlo of       Version 1.0                   TRIUMF
   Spectrometer.       (geometry, digitization etc.)

                       Improve the physics           VPISU
                       content of GEANT

                       Spectrometer design           Texas A&M,
                       questions.                    Valparaiso,
                                                     TRIUMF

                       2nd order                     Kurchatov
                       radiative corrections


  Monte Carlo of       Muon source                   TRIUMF
  muon beamline.

                       Beamline simulations          UofA


  Spectrometer         Detector components           Kurchatov,
  Design and           (design, construction         TRIUMF
  Construction         and testing)

                       Detector electronics          TRIUMF,
                       Front end                     Kurchatov,
                       (design, construction         UofA
                        and testing)

                       Magnet purchase and           TRIUMF,
                       Mounting                      UofA

  Muon beamline        Target, slits, etc.           UofA,
                      (design & construction)        TRIUMF

                       Tests (M13/M11)               UofA,
                       (experiment & analysis)       Texas A&M,
                                                     TRIUMF


**********************************************************************
 If you want or need greater detail about presentations made at the
meeting please peruse the documents submitted to
http://www.phys.ualberta.ca/~e614/Projects/E614MEETINGS/
If you don't find what you want there contact the presenter (see
the mail list http://www.phys.ualberta.ca/~e614/collaboration/).

 Thanks to all who participated and congratulations on the 25 very
important decisions that were made in an atmosphere completely open
and friendly. We must now work hard to be more than ready for the
detector review in December.

       Dave

*************************************************
David R. Gill (drgill@triumf.ca)   (604) 221-3219
TRIUMF                              Fax  222-1074
Vancouver, BC
V6T 2A3

Created for the The Center for Subatomic Research E614 Project Projects Page.

Created by The CoCoBoard.