Polarized He-3 Target Progress Polarized He-3 Target Progress Chiranjib Dutta (UKY) Joe Katich (W&M) Xiaohui Zhan (MIT) Yi Qiang (DUKE) HALL A Collaboration.

Polarized He-3 Target ProgressPolarized He-3 Target Progress

Chiranjib Dutta (UKY)

Joe Katich (W&M) Xiaohui Zhan (MIT) Yi Qiang (DUKE)

HALL A Collaboration Meeting

Thursday, June 21st 2007

OUTLINE (Work in our target lab.)

Oven/Support structureOven TestLaser UpdateOther related stuffOpticsSoftwareThe real tests

Oven / Support structure

Installed the new oven earlier.Installed the new heaters and RTDsUNFORTUNATELY, the structure was BROKEN near the bottom of the air flow tubeGOOD NEWS===the oven is still safe and fineThe new structure is being designedWaiting on it !!( supposed to be delivered now)

Many thanks to Al and Susan

Few snaps ::::

The GEn Tube

The new oven

Earlier broken portion

Oven Test

Currently the old GEn air inlet and outlet pipe is being usedThe GEn air flow system installedTrying to heated up the oven.Successfully heat up to 240 deg. CMore tests to be carried out next week to optimize

Laser Update

6 single FAP and 2 Duo FAPAll tested and recalibratedOne needs to be repaired and will be sent shortlyGOOD NEWS ::::

COHERENT decided to resume production

Other Aspects

New pick up coils/stands ready Vertical coil support design completed and deliveredMoving fixture design completed and deliveredBB Field clamp design completed and orderedExit beam line design mostly completed6 hybrid cells already produced and on track with one in every couple of weeks

Optics

New 5 to 1 combiners tested (qty=3)

New 75 meter fibers (qty=10) testedALL LOOK GOODAll of them to be installed in the Hall in summerThe Optics line design to be worked on shortly

3 optics line:: Longitudinal,Transverse,Vertical Simulation is being done for the optics lines

SoftwareCombine the spin-flip lab view code with NMR signal analysis and EPR measurement.

1. NMR frequency sweep signal can be extracted and fitted after every spin-flip. Provide quick & continuous cell polarization monitoring.

2. EPR measurement can be controlled automatically by spin-flip program during every spin-flip, also can be controlled manually without affecting the main program.

3. Add counter connected to FG to monitor the frequency sweep process which is crucial to spin-flip.

Spin polarization status(+/-) can be monitored continuously by a TTL output signal of the FG together with ADC and scalar. The record of Labview can communicate with EPICS as a complementary method to check the spin status.All of the software programs will be fully tested after the installation.

Real Tests on list in next 3 months

The oven is being testedLaser alignmentNMR/EPR/SPIN FLIP to be testedAll the new related softwares to be tested accordinglyWater field and frequency sweep to be triedNew vertical coil to be tested in the new labBB field mapping with the new shielding before moved to HALL C

With 1. All instruments we need 2. All softwares ready 3. Oven working good 4. 3 students and 1 post doc working 5. All experts/experienced people around

We will definitely be able to meet the deadline already set before and

WE WILL BE READY by January 1st 2008 for installation

Towards all four He-3 Experiments starting with TRANSVERSITY

Wolfgang Korsch Jian Ping Chen

Todd Averett Jaideep Singh Aidan Kelleher

Ameya Kolarkar

Acknowledgement :::::::