Design of a Hybrid 3 He Polarizer: Measurement Techniques and Construction. Karen Mooney University of Virginia March 25, 2008
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1 Design of a Hybrid 3 He Polarizer: Measurement Techniques and Construction Karen University of Virginia March 25, 2008
2 Polarizer Basics
3 New Polarizer Advancements More Gas 3.0L/day Vs 1.0L/day Higher 60% Vs 40% Rb-K Hybrid Cell Narrowed Diode Lasers Enhanced Diagnostics AFP NMR w/ EPR calibration Vs Pulse NMR w/ Water calibration
4 Measuring Nuclear Magnetic Resonance (NMR) Polarized 3 He nuclei are aligned with an external magnetic field He Nuclear Spins are flipped by applying a transverse RF Faraday Induction signal detected in mutually perpendicular coils Signal detected is proportional to 3 He polarization Holding H Helium Spin
5 Measuring Nuclear Magnetic Resonance (NMR) Polarized 3 He nuclei are aligned with an external magnetic field He Nuclear Spins are flipped by applying a transverse RF Faraday Induction signal detected in mutually perpendicular coils Signal detected is proportional to 3 He polarization RF H 1 Holding H Helium Spin
6 Measuring Adiabatic Fast Passage RF H 1 Holding H Helium Spin
7 Measuring Adiabatic Fast Passage RF H 1 Holding H Helium Spin
8 Measuring AFP RF H 1 Holding H Helium Spin
9 Measuring AFP RF H 1 Holding H Helium Spin
10 Measuring AFP RF H 1 Holding H Helium Spin
11 Measuring AFP RF H 1 Holding H Helium Spin
12 Measuring AFP RF H 1 Holding H Helium Spin
13 Measuring AFP Helium Spin RF H 1 Holding H
14 Measuring AFP RF H 1 Holding H Helium Spin
15 Measuring AFP RF H 1 Holding H Helium Spin
16 Measuring AFP RF H 1 Holding H Helium Spin
17 Measuring AFP RF H 1 Holding H Helium Spin
18 Measuring AFP RF H 1 Holding H Helium Spin
19 Measuring AFP RF H 1 Holding H Helium Spin
20 Measuring AFP Adiabatic- is swept slowly so that the spin can follow it Fast- The is swept quickly enough so that the spins do not relax in the low field region. Holding H Helium Spin
21 Measuring AFP Schematic -Holding (H) -RF H 1 (ω) - - Pick Up Coils x z y -EPR Coil EPR Photo Diode
22 Measuring AFP Schematic -Holding (H) -RF H 1 (ω) - - Pick Up Coils x z y -EPR Coil EPR Photo Diode
23 Measuring AFP Schematic -Holding (H) -RF H 1 (ω) - - Pick Up Coils x z y -EPR Coil EPR Photo Diode
24 Measuring AFP Signal Lock-In Signal A Spin Up Fit Sample NMR Signal Sample Spin Up Taken 01/2008
25 Measuring Electron Paramagnetic Resonance
26 Measuring EPR- Measuring Frequency Shift
27 Measuring EPR- Measuring Frequency Shift
28 Measuring EPR- Measuring Frequency Shift
29 Measuring EPR- Monitoring Frequency
30 Measuring EPR- Reversing 3 He RF H 1 Holding H Helium Spin
31 Measuring EPR Schematic -Holding (H) -RF H 1 (ω) - - Pick Up Coils x z y -EPR Coil EPR Photo Diode
32 Measuring EPR Schematic -Holding (H) -RF H 1 (ω) - - Pick Up Coils x z y -EPR Coil EPR Photo Diode
33 Measuring Main Optical Pumping Oven
34 Measuring Main Optical Pumping Oven
35 Measuring Main Optical Pumping Oven
36 Measuring Main Optical Pumping Oven
37 Measuring Main Optical Pumping Oven
38 Measuring Calculating Calibration Procedure Take NMR Do EPR Take NMR Calculate P He Average NMR Signals Get %/mv Calibration
39 Measuring Calibrated Data Calibration usually performed once per cell installation Changes with cell movement, coil movement, gain adjustments, etc. Recommended every few months for new Hybrid Polarizer.
40 Construction Initial Proposal: 07/07
41 Construction Initial Proposal: 07/07
42 Construction Initial Proposal: 07/07
43 Construction Initial Proposal: 07/07
44 Construction Initial Proposal: 07/07
45 Construction Cart Constructed: 12/07
46 Construction Laser Comparison: 11/07 FAP COMET
47 Construction Lower Gas System: 02/08 Lasers
48 Construction Lower Gas System: 02/08 Lasers
49 Construction Lower Gas System: 02/08 Lasers Reduces Pressure from 3000 psi to 150 psi
50 Construction Lower Gas System: 02/08 Lasers
51 Construction Lower Gas System: 02/08 Lasers
52 Construction Lower Gas System: 02/08 Lasers
53 Construction Lower Gas System: 03/08
54 Construction Upper Gas System: 02/08 Laser 3 He fill N 2 / Vacuum
55 Construction Upper Gas System: 02/08 Laser 3 He fill N 2 / Vacuum
56 Construction Upper Gas System: 02/08 Laser 3 He fill N 2 / Vacuum
57 Construction Upper Gas System: 02/08 Laser To Bag 3 He fill N 2 / Vacuum
58 Implementation Operational Target: 04/2008
59 Acknowledgements Gordon Cates Peter Dolph Wilson Miller Vladimir Nelyubin Scott Rohrbaugh Jaideep Singh Al Tobias
60 Polarizing Spin Exchange Optical Pumping (SEOP) Collisional Mixing Rb 3 He 5P1 2 m J = 1 2 m J = Nonradiative Quenching D 1 Light σ + N N 3 He Rb 5S1 2 m J = 1 2 m J = Spin Exchange diagram Source: Singh, 2004 Spin Relaxation Rubidium energy level diagram which details optical pumping. Source: Singh, 2004
61 Simone- Previous Performance Cell Performance Maximum 60% 55% 50% 45% 40% Al Anna Barbara Dolly Edna Eva Gloria Simone 35% 30% Predicted [K]/[Rb]
62 EPR Finding the Transition Frequency
63 AFP NMR Electronic Block Diagram (Oven Control) control control control LabVIew Computer DAQ DAQ DAQ (Oven Temp) in khz FG out sync in khz Amplifier out in Tuned RF Coils in Amp/Phase out in in Oscilloscope Pickup Coils out in Pre Amp out in in ref Lockin Amp out in Holding FG out in DC Power Supply out SHUNT in Holding Coils in Multimeter out
64 EPR EPR Electronic Block Diagram control control LabVIew Computer DAQ DAQ DAQ in Mod in EPR FG (MHz) out sync in MHz Amplifier out in EPR Coils in Universal Counter out Photo Diode out in ref Lockin Amp out in Mod in Feedback Chassis out in Modulation FG HI out Lo out in Oscilloscope (same as NMR)
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