Minutes of Hall A Group Meeting June 30, 2009
1)
Bert
Manzlak:
a)
Things
are looking nice in the Hall
b)
Work
observations are being done routinely
i)
Anyone
who would like to tag along is welcome (a different perspective could be
useful)
c)
Protocol
for undergraduates at the lab:
i)
For
the 1st 90 days:
(1)
Get
all needed training
(2)
Must
always have a trained escort when in the Hall
(3)
After
90 days will be reevaluated and the escort requirement may be lifted.
d)
Sirish,
having collaborators coming in who will need to work with lead, asks what
training is needed/available. Bert says there is
training. Contact Bert to schedule it.
2)
Sirish
Nanda:
a)
Compton
Polarimeter:
i)
Spoke
with Brian Quinn last week re the photon detector
(1)
Going
to enlarge the beam pipe
(2)
Brian
talked to the designers
(3)
Hope
to get it done during the down
ii)
Cavity:
(1)
Dismantled
the cavity last week for ultrasonic cleaning
(2)
Reassembling
this week
(3)
Getting
ready to make plans to install it. Talking with Al re the installation design
iii)
Introduces
ODU post-doc helping with the Compton.
3)
Javier
Gomez:
a)
Ed
is trying to cooldown the Møller magnet again
b)
All
parts for the Møller target holder are in the machine shop, test fits underway
c)
Møller
target thicknesses fixed:
i)
Two:
1 micron
ii)
One:
5 microns
iii)
One:
10 microns
4)
Doug
Higinbotham
a)
Thanks
to Vince for getting things cleaned up in the Hall
b)
Working
on installation plans for 2012
5)
Alexandre
Camsonne:
a)
Working
with Michel Brossard:
i)
Checked
the Trigger logic
ii)
Efficiency
is low at the logic level, tested with an oscilloscope.
iii)
Doing
more tests with a source
6)
J-P
Chen:
a)
Transversity
and Coulomb Sum Rule analyses are making progress
b)
Most
things taken down in the Hall
c)
Review
paper on Spin for Progress in Particle and Nuclear Physics is ready
d)
10-year
chapter on spin is finished
e)
Working
on Proceedings for Intersections
7)
Ole
Hansen:
a)
Counting
house computers were upgraded to Giga-bit this morning
b)
Getting
bug reports re the analyzer
i)
Encourages
all users of the Analyzer to report bug info to Ole
8)
Bogdan
Wojtsekhowski
a)
Preparation
of VDC6 continues
i)
Chamber
is working
ii)
Debugging
gas leakage
(1)
Mostly
from thin windows
(2)
Refining
gluing technique and repairing
b)
Starting
to repair VDC5
c)
S1m
was constructed a few months ago. Now we need to design a frame for it. There's
a student working on that.
d)
SBS:
CERN making good progress on GEM technology. Have manufactured 1 x
0.4 m2 foils and have plans to make 2 x 0.4 m2
foils
e)
Introduces
Delano Wilson, U. Va. Student working on SBS layout.
i)
Delano
shows assorted 3-D views of SBS magnet, target chamber, and detectors as
assembled in his 3-D model.
9)
John
LeRose
a)
Looking
at ways to get larger acceptance out of HRS without going to the extreme of
moving Q1/Q2 or the low momentum limit it imposes
i)
Adding
a quad in front of Q1(suggested by Doug) gives an increase in
acceptance with less loss of maximum momentum (3.7 GeV/c and 23% increase
in acceptance)
ii)
Simply
retuning HRS works almost as well (~3.2 GeV/c and ~18% more
acceptance)
b)
Looking
at 3-D magneto statics for SBS magnet and the problem of bending the primary
beam due to field caused by the combination of the field clamp and holes in the
clamp and yoke. Last week managed to make it worse. So, hopefully have a handle
on making it better.
-JJL