Tensor Optimized Solid Polarized Targets

Transcription

1 Tensor Optimized Solid Polarized Targets Dustin Keller March 12, 2014 Dustin Keller (UVA) Tensor 2014 March 12, / 21

2 Table of contents 1 Introduction Tensor Target Observables Definitions Material 2 Offline Tasks A Few Words on Measurement 3 Online Tasks at Hand Dustin Keller (UVA) Tensor 2014 March 12, / 21

3 Spin-1 Target Observables ρ = a 1 1+a x I x +a y I y +a z +I z +a xy I xy +a xz I xz +a yz I yz +a zz I zz +a 0 I 0 ρ = a 1 +a z I z +a zz I zz Focused target research to extract specific observables: How to define observables (bleeding) How to best optimize target to extract observables Do as much a we can -RF irradiation oriented deuterium nuclei- Dustin Keller (UVA) Tensor 2014 March 12, / 21

4 Spin-1 Polarization Vector Polarization plus and minus Vector Enhanced Tensor Polarization Tensor Enhanced Tensor Polarization Positive: RF-Saturation Negative: Pedestal High Power-RF, DNO, AFP Double Microwave faulty assumptions in the method Dustin Keller (UVA) Tensor 2014 March 12, / 21

5 Vector Enhanced Tensor Polarization Solid Polarized Target (ND 3 ): Standard Polarized Target Standard Field 5T Strength P zz =10% Dustin Keller (UVA) Tensor 2014 March 12, / 21

6 Solid Polarized Tensor Target Same Systems (A) DNP, RF-sat, Microwave, Stronge B-Field (B) Cryogenic System (1.5 K) (C) ND 3 (D) Intermitent NMR (A) DNO using RF, AFP (B) Cryogenic System (0.03 K) (C) Materials Specific to Experiment (D) NMR same as before Dustin Keller (UVA) Tensor 2014 March 12, / 21

7 Target Configured to specific Tensor Asymmetry Evaporation P = n + n n + + n + n 0 ( 1 < P z < 1) P zz = n + 2n 0 + n n + + n + n 0 ( 2 < P zz < 1) N A T c + N P zz + N + Pzz c N ± N N+ Pzz N ± +N Positive and Negative Negative and Unpolarized b 1,..., A zz,... d-dvcs Hall B, Low Q 2 d-rcs, High Mandelstam QE, X>1 Dilution T 20, T 21, T 22, A T d, AT ed,... photodesintigration photoproduction Hall D vector meson production e -disint. A T Positive and Unpolarized Dustin Keller (UVA) Tensor 2014 March 12, / 21

8 Materials Quantify Characteristics Maximum Polarization Dilution Factor Material Performance Spin-Lattic Relaxation m = 0 Cross Relaxation proton-deuteron chemical orintation Initial Materials (A) ND 3 (Irradiated) (B) d-butanol (Irradiated) (B) d-butanol (Doped) (C) d-propanediol (Doped) (D) d-ethanediol (Doped) Dustin Keller (UVA) Tensor 2014 March 12, / 21

9 Tensor Enhanced Tensor Polarization: Postive Solid Polarized Target (ND 3 ): Add RF coil to cup Continual Microwave and RF Reduced frequency of area measurements long period between helicity states Dustin Keller (UVA) Tensor 2014 March 12, / 21

10 Tensor Enhanced Tensor Polarization: Negative Solid Polarized Target (-diol): Add RF coil to cup Initial Microwave and RF DNO Freeze Helicity State AFP to fast flip Dustin Keller (UVA) Tensor 2014 March 12, / 21

11 Offline Tasks At Hand Work in Progress Opt. RF Amplitude: Length, coil wire, Amp Measurement techniques and error Material Prep Fitting (+) TETP Fitting (-) TETP Decay Trend fitting Dustin Keller (UVA) Tensor 2014 March 12, / 21

12 RF Modulation Deuteron RF Modulation First Run 1 Secondary Coil ( 2 mt/a 30 mw) 2 Quick Near Sat. (just to test) 3 Bounced back Quick with µ 4 Several min. without µ Dustin Keller (UVA) Tensor 2014 March 12, / 21

13 RF Modulation Modulating Center Frequency Setup studies 1 Amplitude, Power Control 2 Cable, Wire type, Amp 3 Material Prep Dustin Keller (UVA) Tensor 2014 March 12, / 21

14 Using RF Saturated Signal For Positive TETP Measure Area and Fit Signal (keep error down) RF Peak and Pedestal Hold on µ and RF Measure based on saturation assumptions with new I Calculate portion contributing to P zz (error) Lose NMR and capacity to monitor area con. Dustin Keller (UVA) Tensor 2014 March 12, / 21

15 Using RF Saturated Signal For Negative TETP Measure much easier C(h + h ), fitting ok Error much smaller DNO, AFP DNO: Lattice properties, Arrangement of protons, Modulation properties, Materials How to make matterials that best tensor polarized Test radiation decay, doping, P zz mag. Not for b1,...etc as its is proposed Dustin Keller (UVA) Tensor 2014 March 12, / 21

16 Spin-1 Polarization P = n + n n + +n +n 0 Measurement from Ratio P = (r 2 1)/(r 2 +r +1) Assume Boltzmann Distribution E 0 E 1, E + = E 0 E 1, I + E 1 E 0, E = E 1 E 0, I r 2 = I + /I = n + /n r n 0 /n Dustin Keller (UVA) Tensor 2014 March 12, / 21

17 Tensor Polarization Measurement P = n + n n + +n +n 0 Measurement from Fits P = (r 2 1)/(r 2 +r +1) Assume Boltzmann Distribution E 0 E 1, E + = E 0 E 1, I + E 1 E 0, E = E 1 E 0, I r = I + /I = n + /n r n 0 /n Dustin Keller (UVA) Tensor 2014 March 12, / 21

18 Tensor Polarization Measurement P P zz = n + 2n 0 +n n + +n +n 0 Measurement from Fits P = (r 2 1)/(r 2 +r +1) P zz = (r 2 2r+1)/(r 2 +r+1) δp δp zz r r 9 Uncertainties For r = 2.5 (P = 50%) same for fixed δr δp zz /P zz 7.5% Vector Enhanced 4% δp zz /P zz 12% Tensor Enhanced r 9 Dustin Keller (UVA) Tensor 2014 March 12, / 21

19 RF Modulation H = ω 0s S z +2ω 1s S x cosωt+ω 2s S z kf(φ,t) P zz = n+ 2n0+n n ++n +n 0 Measurement Capacity 1 Material Dependent 2 Enhancement Technique 3 Limitations with NMR 4 Error Propagation Dustin Keller (UVA) Tensor 2014 March 12, / 21

20 Enhanced Tensor Polarization Measurement Enhancement Method 1 P zz = (r 2 2r + 1)/(r 2 + r + 1) 2 P zz = ni ± +dn 0 2(ni 0 dn 0 ) N = P i zz + f(ai,a f,r) 3 P zz = IP I + +I ν rf δa 4 P zz = 1 3 n 0 N = C(I + I ) Error Estimates (a) Natural distribution (4%) (b) RF Saturation (9-12%) (c) Proton RF (4-6%) Dustin Keller (UVA) Tensor 2014 March 12, / 21

21 Work To Come with Cooldown Tensor Polarized Target (a) Measuring Fitting real tensor enhanced signal with error (b) Establish 30%+ with positive TETP with RF saturation <10% error (c) Establish any negative polarization (d) Try listed materials (e) Alignment Relaxation Parameters for ND 3 (f) Study mod-f/steps, Waveform, Pol. Efficiency Dustin Keller (UVA) Tensor 2014 March 12, / 21