GEn Meeting - 10:30am - 12:35pm and 2:00pm - 5:00pm !!

Kees wants milestones by Tuesday! Target, BigBite, Neutron Arm and Software (5 milestones each).

   #BigBite#

   (Brandon)Talked about progress with wire chambers. Working with Igor. 2nd chamber should 
arrive in a week or 2. (Albert) To receive more manpower, specially in summer. Currently 2 
students from Spain on the project. Detector parts have arrived; vertical assembly in
 test lab by May 1. Then install cassettes from JLab and UVa. Still requires some work: 
modify rollers, Aluminum, phototubes. Proposal to put Brandon on the electronics.
   (Bodo) 2nd VDC crate ready. Waiting for SRC to end; shall put all 3 channels in the test lab.
   (Bogdan) Shower detector cosmics going well. 1st scan will be done by the end of this week. 
Preshower waiting for the arrival of phototubes this week, then take about 1 month to finish.
 Install preshower by mid-May.

(Bodo) Distance of the (front face 0f the) first neutron detector from the 
target - 10m; 12m for high momentum setting.

   #Software Update#

(Bodo) - Gave summary of the last software meeting

   #Neutron Detector Update#

(Bogdan) Full design of the Neutron Detector complete. 0.5" steel plate to be put on the floor.
 All parts of the cage have arrived. 3-4 weeks behind in assembling (DAQ, cables);
 accelerator people said they'll do it around the 1st week of May.


-Jaideep:

Talked about the solution to diverging beam spots from the combiner using gaussian beam
 characteristics. Summarized cell production situation at UVa. In short, need to put a
 large focal length(f2) lens after the first lens(f1) such that the distance between the 
lenses L > f1+f2. See his complete talk here: http://www.jlab.org/~singhj/?????.ps

   #Design Aspects#

   (Gordon, Alan, Bogdan, JP) Split machining jobs in more than one institution; release
 target drawings as quickly as possible. Alan has broken down parts by sub-assembly; 
Gordon and Vladimir will discuss with him tomorrow (April-14).
   Issues
   ~with pick-up coils -> It's necessary to have adjustibility/clearance.
   ~with laser beam stop -> tilt the beam stop by about 45 degrees so as to prevent 
the reflection from depolarizing the cell.
   ~in-box real-estate -> need to be able to life the target ladder high enough so as to
 enable frequent measurements of magnetic field direction. Ameya to send Alan compass height.
   ~one or two target ladders ? 3 positions -- helium-3, empty, foils. and then H/N/reference
 cells? Single ladder preferred. C not needed.
   Discussions about the pipe taking hot air to the oven: vent the hot air out through the
 same pipe. maybe, glue the flange to the pipe?
   ~top-of-box real-estate -> how much room do we need? specially with the new 4 meter
 pathlength. Also, JP would like to begin testing in the new laser building ASAP, 
independent of the optics design status.
   ~GC will have a nominally working target system ready between Jun1, and Jul1. Whether to 
keep making more cells will depend on the test results of earlier cells.
   ~Magnet box power supply to be provided by the accelerator group.

   #New laser building#

   Enclosure is small for magnet box with the optic bench on top.
   Would like to start off testing with different optics setup till the final version is
 ready; the optics setup needn't be coupled to the magnet box. Might have to move the 
optics table a little from it's current proposed position.