Overview of Onsite Progress

Jian-ping Chen g2

p /Gep Collabroation Meeting

REGION 1

REGION 2 REGION 3 REG 4 REGION 5

Slow Raster

FZ1FixedStand

FZ2 Telescoping Stand

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/GE

p 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 deg2.2 GeV, 15 deg

3.3 GeV, 6 deg2.2 GeV, 6 deg1.6 GeV, 6 deg1.1 GeV, 6 deg

Polarized beam: 50-130 nA up to 5 uA? for optics, 30 uA ? for

ComptonPolarized 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)g2

p needs target at 90 degrees for all and 0 degree for 3.3 GeVGE

p needs target at 80 degree

Kinematic Settings (Last Meeting)

3.3 GeV, 12.5 deg2.2 GeV, 12.5 deg

3.3 GeV, 6 deg2.2 GeV, 6 deg1.6 GeV, 6 deg1.1 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 g2

p 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)G2

p : target at 90 degrees for all and 0 degree for 3.3 GeVGE

p : target at 20 degree?

Kinematic Settings (Now)

• Cost, mostly consistent with initial estimation, some increase due to new itemsA) 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)? ?