Overview of Onsite Progress
Jian-ping Chen
g2p /Gep Collabroation Meeting
REGION1
REGION 2
REGION 3
REG 4
REGION5
Slow Raster
FZ1
FixedStand
FZ2 TelescopingStand
DUMP
TARGET
•Polarized Solid NH3 Target (Hall C/UVa target)
Target material irradiation
•Beamline (Similar to Hall C)
Magnetic Chicane/Beamline modifications.
Low beam current BCM/BPMs
Slow Raster
•Hall A Engineering/Design
Local Beam Dump
Hall Infra-structure
Scattering Chamber/ Target/magnet mount
Septum Magnets
•Simulations/Optics/Spectrometer/Detectors/QAD…
BPMs
Use existing equipments
Hall C beamline/target
Keep change minimum
modify the existing PREX septa
use simple local beam dump
Major equipments for g2p/GEp experiments
Septa/HRS
•Significant Progress in Beam Line System (T. Michalski, B. Dillon-Townes)
• Overview conceptual design completed
• Region 1 and Region 2 design drawings completed
• Region 3 main items identified and detail design on-going
• Existing hardware items (magnets, raster, power supplies) located
• New items (BPM electronics, Harps, BCM, BD magnets, …)
•Target Progress (C. Keith/ D. Crabb)
• Conceptual design
• Rotating seal
• Pumps ordered
• New fridge at UVa tested (along with existing target materials and other systems)
• need to manufacture one fridge at JLab
• Target material irriadiation: will do it at NIST
• Magnet is being shipped from Oxford back to JLab?
•Hall A infrastructure, Beam dump, Septum (A. Gavalya, R. Wines)
• Setup at the pivot area for the target
• Beam dump
• Septum
• Scattering chamber/ layout/ interferences
•3rd Arm for polarization monitoring
•Simulations
Overview of Progress
3.3 GeV, 12.5 deg
2.2 GeV, 15 deg
3.3 GeV, 6 deg
2.2 GeV, 6 deg
1.6 GeV, 6 deg
1.1 GeV, 6 deg
Polarized beam: 50-130 nA
up to 5 uA? for optics, 30 uA ? for Compton
Polarized NH3 target
Slow Raster 25 mm diameter
Gep configuration is now basically
g2p at the elastic setting
Two configurations: with septa (6 degree) (target at 87 cm upstream)
and without septa (12.5 and 15 degrees) (target at original pivot)
g2p needs target at 90 degrees for all and 0 degree for 3.3 GeV
GEp needs target at 80 degree
Kinematic Settings (Last Meeting)
3.3 GeV, 12.5 deg
2.2 GeV, 12.5 deg
3.3 GeV, 6 deg
2.2 GeV, 6 deg
1.6 GeV, 6 deg
1.1 GeV, 6 deg
Polarized beam: 50-130 nA
up to 1 uA for optics, (also for Compton?)
Polarized NH3 target
Slow Raster 20-25 mm diameter
Gep configuration is basically
g2p at the elastic setting
Two configurations: with septa (6 degree) (target at 87 cm upstream)
and without septa (12.5 and 15 degrees) (target at original pivot)
G2p : target at 90 degrees for all and 0 degree for 3.3 GeV
GEp : target at 20 degree?
Kinematic Settings (Now)
• Cost, mostly consistent with initial estimation, some increase due to new items
A) Beam line procurement: 14 BMP electronics
harps (can not use the existing French harps)
Beam line manpower: the two items above + software group
B) Target group estimation, procurement increased from 80 K to 140K.
• FY11, continuing resolution
addition funding from DOE (promised) not here yet.
• User pledged contribution to procurement : $ 80K
to Engineering/Installation: ?
Total: $140K
Will need user to honor the pledges.
• Manpower cost will be supplied from within JLab.
Need help from user manpower
Budget and User Contributions
Questions and Issues
• Should we do Compton with 1 uA, straight-through, how many times?
• How should we do optcis study-? What optics target(s) should we have?
• How to do the polarization monitoring (3rd arm)?
• Should we do a field map at EEL?
Should we add some iron plates to study the effect?
Should we and how to measure field direction?
Should we do a field map in Hall A (combining target/septa)?
•…?
Onsite User/Hall A People Power
• PhD Students:
Pengjia Zhu (USTC, advisor: Yunxiu Ye), 3rd year, onsite, (beamline, target)
Min Huang (Duke, Haiyan Gao), 3rd year, onsite, (simulation, optics)
Chai Gu (UVa, Nilanga Liyanaga), 2nd year, onsite from 2/2011
Melissa Cummings (W&M, Todd Averett), 2nd year, onsite from 5/2011
A student from Temple (Zein-Eddine Meziani), 2nd year, onsite from 5/2011?
Name? (New Hampshire, Karl Slifer), 1st year, onsite from?
?
• Postdocs:
Kalyan Allada (Hall A), beamline, 3rd arm
Jixie Zhang (Hall A): simulation, optics
Xiaohui Zhan (Argonne) (onsite from 2/2011), target?
Narbe Kalantarians(UVa): target
Hovhannes Baghdasaryan (UVa) ?
Sarah Philips (New Hampshire) ?
?
• Physicists:
Jian-ping Chen (Hall A): Project manager, overall coordination
Alexandre Camsonne (Hall A): Beam line, DAQ, …
Karl Slifer (New Hampershire): Overall consideration, run plan, …
Doug Higinbotham (Hall A) (will be more available after SRC experiments?)
Guy Ron (LBNL)?
?