Minutes of Hall A Group Meeting November 16, 2010
1)	General Announcements: (Kees de Jager)
a)	Mont has agreed to put the beam schedule through 
May of next year on the web.
i)	Larry is working on the accompanying memo
ii)	Schedule is unchanged from what was 
previously distributed, but it assumes the 
final budget for next year is not much lower 
than what we are getting from the present 
continuing resolution
iii)	When it comes out please read the 
accompanying memo carefully
iv)	The schedule for Hall A after the 6-month 
down is very tentative
(1)	We won't know for some time if there 
will be enough time to transition between g2p 
and Hypernuclear
b)	2nd floor of the counting house is being upgraded. 
Get your stuff out. Pay attention to plans as 
they develop.
2)	Run Report: Jixie Zhang (DVCS)
a)	For full report see: 
http://hallaweb.jlab.org/news/minutes/RC_Summarie
s/RC_Report-11-16-10.pdf
b)	Reviews current configuration
c)	Week at a glance:
i)	Mostly Production Data, flipping between LD2 
and LH2 once per day
d)	Problems:
i)	Y-position fluctuations, 0.2 mm
ii)	Deadtime
iii)	Target is stable but cryo-flow fluctuates.
(1)	TO's should watch and adjust JT's to 
keep heaters at >30 Watts
e)	Plans for next week:
i)	Change polarity, Weds, 11/17
ii)	Elastic calibration, Weds and Thurs, 11/17-
11/18
iii)	Fill big Dewar and cool Møller magnet, Thurs 
and Fri, 11/18-11/19
iv)	Switch polarity, Fri, 11/19
v)	Change Beam energy, Mon, 11/22
vi)	Spin dance with Hall C, Mon or Tues, 11/22 or 
11/23
f)	Ole comments re deadtime and use of adaql2, 
dvcsdaq is a top of the line new machine and 
should be much faster.
i)	Alex says he's testing dvcsdaq
ii)	Carlos is concerned about changing DAQ 
computers in the middle of the experiment
3)	Al Gavalya
a)	g2p:
i)	beam dump design is well along but on hold 
pending approval of beam position monitoring 
scheme
ii)	Susan is starting design drawings for the 
thin upstream window
iii)	Whit is testing the failure modes of the 
window
(1)	Also working on the Møller cryo-can
b)	Joyce is working on the Møller drawings. Expect 
them to be ready by the end of November, reviewed 
in December, and out for bids by January
4)	Sirish Nanda is reviewing Compton upgrade plans
5)	Doug Higinbotham
a)	SRC: 
i)	collaboration meeting is scheduled for December 
7
ii)	All needed things are designed except for the 
targets
6)	Alexandre Camsonne
a)	Latest firmware from the electronics group is in
b)	Deadtime problems
c)	Calorimeter trigger
d)	Ole suggests connecting adaql1 disks to adaql2 
for faster service. Alex agrees.
7)	Kalyan Allada
a)	Working on Transversity analysis for the 
collaboration meeting on Saturday (11/20)
b)	Hopeful, the n results will be declared final
8)	Ole Hansen 
a)	Analysis workshop is scheduled for December 8. 
He's putting together the agenda. Contributions 
are invited.
b)	Working on BigBite and SBS simulations
9)	Bogdan Wojtsekhowski
a)	Working on SBS and new proposals
i)	Evaluating the use of a Cerenkov detector in an 
open geometry configuration
ii)	Working on BigBite and SBS simulations
iii)	Gen with recoil Polarimeter
b)	FPP front chamber:
i)	Started repairs
ii)	Gives details of repairs done and still 
needed
10)	Arun Saha
a)	Letter on Oxygen is going out
b)	Working on 3He
11)	John LeRose
a)	Helping Bogdan with SBS
b)	Working on migrating SNAKE and other optics codes 
to newer machine (Jlabs2 is going away soon)
12)	Doug Higinbotham adds that pi0 has nice results on 
ATL, i.e. the azimuthal asymmetry from the polarized 
beam.
13)	Kees adds that it's time to get busy with 
contributions to the Hall A annual report
-JJL