Feasibility Check / How to test EquipmentsStatusCostDateCommentsContact Polarized 3 He atomsCell for transfer design / LKB, Paris/MainzSspm.e. optical.

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Presentation transcript:

Feasibility Check / How to test EquipmentsStatusCostDateCommentsContact Polarized 3 He atomsCell for transfer design / LKB, Paris/MainzSspm.e. optical pumpingProf. Tastevan Polarized 3 He atomsShimizu Target at RCNPSpin exchange ECR IonizerExists : HIPIS2.45GHz Connection to ECRNeed drawings etc… around ECRMagnet for Holding field Polarimeter for atomsNMR Polarimeter for ionsBeam course / When ? Readout/DAQ/ControlShould be prepared Feasibility test 1Depolarization2003 endBPAC / Possible schedule to install 3He cell etc.. Feasibility test 2Ion collection efficiency with 4He/6Li2003 endBPAC / What should be prepared ? What should be checked experimentally and with simulation (if possible) 1.Depolarization in the ionizer : inject polarized 3He gas supplied by (1) Polarized Target at RCNP or (2) LKB, Paris 2.Ionization efficiency : inject 4He gas / detect 2+ ions 3.Detailed study of ionization mechanism Polarized 3 He ion source / Polarized 6 Li ion source ECR ionizer : Ionization ~ complicated multi-step Polarized 3 He atoms ( Polarization: P i, Intensity: I i ) ( Polarization: P f, Intensity: I f ) Polarized 3 He 2+ ion Polarimeter NMR Feasibility check experiment Theoretical / Simulation evaluation Delivered from Mainz to Sheffield in magnetized spin box -Housing a glass vessel -Relaxation time ~ 50 hours (reproducibly ?)

Critical Field to keep polarization J I F B J I B Weak magnetic field Strong magnetic field Critical field to keep polarization : ν(MHz) Ｂｃ (Gauss) 1 H He Li ECR ion source 2.45 GHz ~ 875 Gauss 10 HGz~ 3571 Gauss Hyper Fine Interaction

1.Ionization process / Electron Capture and FI/HFI (1)3He → 3He + + e-: depolarization with HFI (2)3He + → 3He ++ + e-: no depolarization (3)3He ++ + e- → 3He + : depolarization with HFI (4)3He ++ + e- → 3He +* → 3He + + hν: depolarization due to HF (LS coupling) 2.Spin Flip due to Electron Spin Resonance (ESR) and HFI (1)3He + + μ wave → ESR transition ~ electron spin flip ~ HFI : only ECR resonance zone 3.Others Depolarization Mechanism e 1+ e 2+ ee Ionization = Multi-step Process 3 He 2+ Polarized 3He atomsPolarized 3He ++ Ions ECR Plasma Magnetic Field :B Micro Wave Ion confinement time : t conf Electron Cyclotron Resonance :Electron Spin Resonance : 10 msec at 10 GHz (ANL)

Results on depolarization (1) : full effects High vacuum ~ 5*10 -6 torr Low vacuum ~ 2*10 -5 torr HIPIS Polarized 3He atoms ~ polarization : 50 % Includes depolarization due to : 1.Ionization / capture process 2.Spin flip with ESR and HFI Occurred any place in ECR plasma Can be seen 1.High ECR frequency ~ confinement time ~ long ~ ionization process : many times 2.Low vacuum ~ electron capture ~ low polarization 3.Others Polarization ECR frequency (GHz)

What should be considered carefully 1.Spin flip due to ESR (1)ESR ~ only at ECR resonance field region ~ at B=B 0 =mw ECR /e (2)RF magnetic field : B 1 due to micro wave ~ randomly oriented (3)B 1 max = (2u 0 s/c) 1/2 : s~ pointing vector for microwave RF power (4)B1 ~ very small (5)One Larmor precession of the electron in B1 : (γ J B 1 ) -1 ~ μ sec (6)Time to pass Resonance zone (10 um / 10 5 cm/s ~ 1 ns) (7)Too short to flip the spin of electron (8)Can be neglected 2. Confinement time ~ Depolarization in Ionization Process 3. Polarized He gas transfer from ECR Loss Cone ~ confinement time 4. Others Sextupole magnet Mirror Coil Plasma electron 0 Z (mm) 700 Cyclotron Resonance 875 Gauss B(Z) Micro Wave

Results on depolarization (2) Polarized 3He atoms ~ polarization : 50 % ECR frequency (GHz) High vacuum Low vacuum Polarization Remove ESR effects Include ionization process Recover polarization thanks to ESR effects neglect High ECR frequency ~ long confinement time ~ dominant process = ionization

Results on depolarization (3) Polarized 3He atoms ~ polarization : 50 % ECR frequency (GHz) High vacuum Low vacuum Polarization Comparison 1.Confinement time ~ 1 msec : blue 2.Confinement time ~ 10 msec : red -Without ESR effects -High vacuum Possible to realize high polarization with reduction of confinement time by the adjustment of mirror ratio of ECR ionizer …

Results (3)

What should be done Next 1.Understand the Depolarization mechanism (1)Consider / evaluate each depolarization process carefully (2)Polarization estimation obtained by existing ECR (HIPIS) 2.Idea to Overcome the depolarization (1) Straightforward ~ high polarization 3He atom + short confinement time = high polarization + low intensity (2) Nice Idea ….. ~ should be considered … 3.Preparation to measure the depolarization / feasibility test