Polarized 3 He Target System Overview Design Vertical Polarization Spin-Flip Oven/Ladder/Enclosure/Access Laser/Optics/Cells Polarimetry Safety/Documents Installation/Switch-over Milestone, Manpower and Responsibilities

3He Target Overview

Design Progress Progress: (Estimated >90 person-weeks 3 months ago) Completed items: Layout for all four experiments New vertical Helmholtz coils and support New RF coils for vertical polarization New oven system Oven support in the target lab Target collimators Replacement support for horizontal Helmholtz coils New cells (with side pull-offs) Extended magnetic shielding on BigBite fringing field Conceptual design on laser optics lines Conceptual design on vertical Compass

Oven System

Oven being assembled in the target lab

Target Cell

Laser Optics

Remaining Items for Design Remaining design items: (total < 20 person-weeks) Main support Structure Supports for Target drive, Target Collimator, new RF coils, Ref. cell Target enclosure and windows Target ladder and pick-up coils Laser optics lines (including EPR, spectra-analyzer) and support Personnel access Safety interlock Compass mounts

Progress in the target lab Spin-flip test (mostly complete) RF sweep NMR on 3 He works EPR works New support for horizontal Helmholtz coils installed New oven and support arrived, being assembled Two new cells manufactured and to be tested Cell characterization (density and window) setup ready Optical fibers and combiners ordered 5-to-1 combiners delivered, tested and problems found

Spin-Flip Test

RF sweep NMR on 3 He

EPR

Planned tests in the target lab Install new oven, test Test new cells Characterizing new cells Test new components Test new optics RF sweep water calibration Combine polarization measurements with spin-flip Spin-flip signal to DAQ LabView communication with EPICS

Other Components Compass (Kentucky): Conceptual design complete complete design, manufacturing and test Vertical coils (order placed, delivery next month): setup in new target lab, align and field mapping then move to EEL target lab, integrate with horizontal coils Lasers: 9 in hand, 2 spare diodes; new vender: narrow lasers Cells: new contracts with Princeton/Mike Souza medium size (3”) pumping chamber, production started, two in hand, plan to produce 1 cell every two weeks W&M and UVa groups

Vertical Compass Conceptual Design

Safety and documents There are a number of safety aspects for the target: Laser safety: eye, skin, fire hazard, LSOP enclosure, alignment, eyewear, training High pressure glass cells: explosion, radiation, OSP/RWP enclosure, windows, loop around pivot area cell handling: face mask, eye and hearing protection Reference cell system: high pressure, hydrogen Hot Surface/fire hazard from heating Electrical from power supplies Magnetic field All documents will be updated

Manpower Designer: A. Gavalya, S. Esp (and help from others) Students: C. Dutta (KY), J. Katich (W&M), X. Zhan (MIT), Physicists: T. Averett (W&M, part-time), W. Korsch (KY, short-term visit), and J. P. Chen (JLab). Postdocs: from W&M, Duke Help from past students/postdocs. Off-site Cell production/testing at W&M, UVa. Compass design/testing at Kentucky.

Responsibilities Overall: J. P. Chen Design: A. Gavalya/ J. P. Chen Vertical coils, holding field, oven system, ladder, support, cell characterization, reference cell, NMR: J. Katich/T. Averett Spin-flip, EPR: C. Dutta/W. Korsch Optics: C. Dutta/J. P. Chen Software/Labview, communication with EPICS: X. Zhan/B. Moffit Compass: A. Kolarkar/W. Korsch Fringe field: P. Brindza Safety, documents: J. P. Chen

Installation, commissioning, switchover Coordinate with Ed Folts for installation: 4-6 week for the target Move to the hall, survey Move to pivot, survey, install components, Install optical line support, instrumentation, power cables Checkout magnets, measure field direction/survey Install ladder, cells, survey Install reference cell system, cooling jets Water calibration Laser safety inspection, switch to 3 He, laser alignment Pumping up, check out spectra-analyzer, EPR Commissioning: elastic 3 He asymmetry (T and L) Switchover: change cell, water calibration change optical line and check alignment, pump-up EPR, temperature test

Milestones for Polarized 3 He Spin-Flip test: done NMR/EPR system working: done, keep improvement New oven ready for cell testing/characterization: April 1 Vertical coils test: June 1 Cell production: 10 by July 1, 20 by Dec. 1 New target structure: Sept. 1 Compass: Sept. 1 Laser optics line: Oct. 1 NMR FM water (optional): Oct. 1 Complete system test: Nov. 1 Ready for installation: Jan. 1, 2008