WBS 3 Scintillator Plane Assembly

Oct. 3, 2005 Design/Cost Review 2

**[Overall Comments:]{.underline}**

[C. Keppel & M. E. Christy]{.underline}

Jeff presented a nice review of the design, assembly, time, and cost of
this large subsystem. The final design of the nuclear targets will have
a large impact on this and is still being studied.

[N. Grossman]{.underline}

Jeff clearly understands the process for assembling scintillator planes
well. He needs to get the MSP schedule to correctly reflect the assembly
steps to be taken at HU and W&M which are presently simply mirror copies
in the MSP schedule.

**[Specific Comments/Recommendations:]{.underline}**

[K. McFarland]{.underline}

1.  I would like to see on a short timescale some engineering concept
    drawings representing these parts so we can begin to look for
    conflicts and evaluate our conclusions from the fiber routing
    workshop on spacing requirements. Suggested route: Jeff communicates
    to Bob Flight; Bob comes back with questions/comments; Bob
    communicates out to this group with preliminary results; Jeff signs
    off formally on drawings. It sounds like this has already started.

2.  Document the cost effective argument for HU and W&M labor
    (base+indirect)

3.  Costing should be done based on the current "base" scenario used for
    all the other systems (as far as I know), which is 196 planes of
    scintillator, 49 narrow frames, 59 wide frames. If there is a
    decision at the collaboration meeting that says otherwise, then is
    the time to switch to that.

4.  The project seems to not have the older prototyping tasks in. We
    need, I think, to be able to track previous expenditures well.

5.  May we have the project a week in advance of the next review?

[C. Keppel & M. E. Christy]{.underline}

1.  The question of the impact of thick nuclear targets on neutral pion
    reconstruction has not been addressed. Monte Carlo studies are in
    progress.

2.  The thickness of skin/scintillator wrap epoxy has an impact on
    calorimetry/ranging. A couple of ideas for addressing this were
    mentioned, including tracking of the amount of epoxy used in the
    construction of each plane.

3.  At the time of the review it was not clear in what quantities and
    with what time sequencing the shipping of the scintillator to the
    factory institutions would be performed. Jeff stated that there is
    not adequate staging space at W&M.for a large shipment. Cynthia
    stated that it would not be possible to store the scintillator at
    Jefferson Lab. It is likely, though, that Hampton will have
    substantial space in a new facility and this will be investigated.

4.  Studies to produce an estimate of the time required for cutting and
    folding the scintillator wrap, web, and skins need to be performed
    by Hampton before the end of October 2005.

5.  It was questioned whether indirect rates for technicians (46.5%) can
    be negotiated with Hampton and the answer is no. This is basically
    the only indirect costs that are being charged by Hampton, which
    does not charge indirect for student workers or equipment.
    Additionally, HU is dedicating construction space with a loading
    dock in a new building (currently under construction) for this
    effort.

[N. Grossman]{.underline}

1.  Fire test of Lexan, Canex and Intelefoam need to be performed. Need
    to get in contact with Mike Andrews (<mandrews@fnal.gov>) and give
    him what data you have on these substances and samples to test.

2.  Need to similarly fire test scintillator or see if it has already
    been done at FNAL or CERN (Anna & Mike A.)

3.  Need to decide on nuclear targets design and put the cost in MSP
    (design done outside WBS 3).

4.  Determine how large a shipments of scintillator can be sent, to
    where and on what time intervals and time scale (and put in MSP)

5.  Do a time and motion study for fiber gluing to more accurately
    estimate the labor cost (lower costs & contingency hopefully) since
    it is a very labor intensive task.