Status of Target TestingMingyu ChenUniversity of VirginiaJuly 24, 2019Outline:1. PNMR with Lockin and DAQ2. Masing effect and Gradient Coil3. EPR/NMR Calibration4. Characterization of Cell “Savior”5. Convection Speed Test6. Target Lab Remaining Work
Current StatusCompleted Tasks: PNMR with Lockin and DAQ EPR system upgrade with D2 light collection optics Characterize Cell “Savior”Manpower: PhD students: Junhao Chen (W&M, Todd Averett), Mingyu Chen (UVA, XiaochaoZheng), and Melanie Rehfuss (Temple, Zein-Eddine Meziani) Murchhana Roy (U. of Kentucky, Wolfgang Korsch) on-site in July Engineers/Designer: Bert Metzger Supervisor/Coordinator: Jian-Ping Chen
PNMR with Lockin and DAQ(Cell “Protovec-I”)At Transfer TubeAt Target ChamberUpgrade with Lockin and DAQ: Smaller resolution uncertainty (16 bit);Automatically adjust vertical scale(better performance when FID signalbecome smaller)Hot (oven temperature 211 C) spin downmeasurements (every hour). With convection.Calibrate PNMR with NMR with linear fit.3
Masing Effect and Gradient Coil(Cell “Savior”)Field gradient 2.7 mG/cm,Masing threshold for NMRamp 3.1 mV. With gradient coil at 3.0A, fieldgradient is 19 mG/cm, thethreshold increased to 4.9 mV.Non-linear polarization loss (not AFP loss, not relaxation).Principle: coupling of transverse component of 3He spin with NMRpick-up coil. Induced transverse magnetic field will tip away 3Hespin from the main field.Fix: add a gradient coil along direction of main holding field. So fargradient coil at 3.0 A has greatest increase on masing threshold.4
EPR/NMR Calibration(by Melanie Rehfuss)SEOP LaserHelicityC ΔC (mV/kHz)C ΔC (%/mV)EPR-AFP lossper sweep (%)Left0.083 0.0017.117 0.0791.05Right0.133 0.0047.020 0.2201.055
Characterization of Cell “Savior”Maximum Polarization: Masing effect only occur when 3He in highenergy Zeeman state.Using left circularly polarized Laser, withcurrent holding field direction, 3He will bepolarized in low energy Zeeman state.Cell Lifetime: With AFP loss correction, Savior lifetimemeasured to be 28 hours at PC.Life TimeThen the first NMR AFP measurementafter 20 hr SEOP with 91 W laser power Cold withoutwill give Maximum 3He polarization in PCConvection 40%. (by EPR/NMR calibration)AFP Loss3Note: During NMR AFP sweep, the Hespin will change direction and causeCold withoutMasing effect.ConvectionPC(hr)28.52PC(%)0.72TC Upstream(hr)TC Downstream(hr)22.1722.38TC Upstream(%)TC Downstream(%)0.120.136
Convection Speed Test(Cell “Savior”) Need Convection to reduce the 3He polarization gradient between PCand TC.Convection condition is established by adding a convection heater onone of the Transfer Tube.Heater power supply 11.0V, take NMR measurements every 20 sec.(Transfer tube temp gradient: A 40 C; C 70 C)Time difference between NMR amp dip is 1.5 min, center of two pickup coil is apart by 7.35 cm, then convection speed is 4.9 cm/min.Note: Convection speed for “Protovec-1 ” is 5.7 cm/min.7
Target Lab Remaining WorkPolarimetry: Complete water cell calibration Characterize Cell “Fulla”Equipment: Test 4-1 fiber coupling Complete ordering/making required cablesSoftware: Laser control system Epics implementation8
Pulse NMR Polarimetryt pulseAdvantage: Took shorter time to completemeasurement, less depolarizationcompare to AFP-NMR.For future metallic end cells, providelocal polarimetry at transfer tube.Principle: Send a RF pulse at Larmor frequencywhich tips 3He spin away from holding fieldaxis: θ 1 γ H ttip 21 pulseWhen pulse ends, the spin precesses backto its initial state and experience freeinduction decay (FID).FID signal is picked up by the PNMR coil.Measure the transverse component ofmagnetic moment proportional to 3Hepolarization.FID Signal t /T 2S (t ) M z sin (θtip )cos(ω t ϕ0 ) e10
PNMR with Lockin SR844 and DAQ Setup
EPR Measurement(by Melanie Rehfuss)
7 Convection Speed Test (Cell “Savior”) Need Convection to reduce the 3He polarization gradient between PC and TC. Convection condition is established by adding a convection heater on one of the Transfer Tube. Heater power supply 11.0V, take NMR measurements every 20 sec. (Transfer tube temp gradient: A 40 C; C 70 C) Time difference between NMR amp dip is 1.5 min, center of two pick
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