Attendees: Ameya Kolarkar, Bogdan Wojtsekhowski, Brandon Craver, Igor Rachek, Gordon Cates, Albert Shahinyan, Doug Higginbotham, Sharon Beck, Aidan Kelleher, Xin Qian, Sergey Abrahamyan, Eugene Chudakov, John LeRose, Al Gavalya, Rick Holmes

Electron Arm:

Igor presents the status of the shower/pre-shower.  There is a discussion of the difficulties with the ADC readout.

Brandon presents the results of recent cosmics data taken with the first two wire chambers.

Igor believes it will be possible to fully instrument and supply power to chamber 3 before tearing down the equipment in mid-November.

Neutron Arm:

Eugene discusses the problem with oscillations.  Igor has devised a possible solution.  Eugene shows his analysis of cosmics data.

Rick presents his N-20 analysis.

DAQ:

Brad discusses the status of the DAQ.  Data will soon be moved to a work disk.  Xin will begin using the shower class.

Bogdan tells that commissioning begins now.  Half of the work to be done is with the pedestals.  Scripts to analyze the pedestals should be done very early.  Results should be plotted graphically for array detectors in addition to a database.  He reviews his plans for calibration:

Check that the wire chambers withstand the luminosity.

Next, check the shower counters using H(e, ep) elastics.  Find a hit block using threshold > 1 GeV in order to limit events to 1 hit.

Check the back chamber positioned within ~ 10 cm of this block.  From wire number x,y position is determined.  It is then possible to check a small region of expected events in each of the front two chambers.

Next, analyze drift time and reconstruct the vertex.  The expected width due to multiple scattering is ~ 5 mm.

Now, the chamber stack will be moved back ~ .5 meters in order to verify that it is possible to reconstruct the change in distance.

Next, include the neutron arm.

Calibrate the shower counters.

Now turn on the magnet.  Protons are still going to the same position, although the electrons have shifted position.  Reconstruct first a straight line (path of infinit momentum.)  Then check the front two chambers for hits.  Once the track is obtained, calculate drift time.  It is possible to reconstruct the momentum of the electron, its z-position, as well as the polar and azimuthal angles.

Target:

Gordon :

1. 4+4 cells. To be ready with 12 "in spec" cells at the time of the
experiment.

2. DuoFAP tested again at UVa. Tested over-pres. cell Dexter (small chamber).
30+ hours of pumping. 45% pol. at 235 C. Try higher temperatures to get higher
Rb density. Pol. approaching 50%. Testing existing  ells.

3. Want to try something different with the Rb:K mixture. Currently 95% K, 5%
Rb in vapor phase. What is the optimal ratio?

4. DuoFAP will be returned one week from coming Monday.

5. NMR - new noise reduction circuit. Noise reduced to 10microV; 2-3microV at
the preAmplifier input. Describes details. This new gadget helps Field Sweep
NMR. Frequency Sweep might face problems. EPR capability should not be hampered
by it.

Alan:

1. Drawings for ladder ready to go out this week. Final support tube ready.

2. Waiting for guidance for the laser work bench and access and compass
platform. Single access bench for optics (above the compass platform) proposed.

3. (+ Ameya) Temperature rise of combiner, issues and solution discussed. More
study being undertaken.

4. (+ Ameya) Positioning of interlocked box for connectors to connect the 75m
fibers to the legs of the 5-1 combiner (or pentopus) discussed. Box to be
placed within 5m from the optics box input.

5. (+ Bogdan) For the compass mount inside the magnet box, access is needed to
go inside. Either open door, or enter from under the box. Need detachable
reference cell to get enough vertical space for the compass.  Ameya to check
how field direction changes when door is opened. Also to begin sketching
compass platform construction design immediately (both inside and outside the
box).