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1 磁力計に関して Rb NMOR - 理研吉見彰洋 011//3 中性子制御デバイスとその応用 京大原子炉

2 EDM measurement = 0 0 E= 0 E // ω + E // ω δd = 1 8 e 4dE ν = h cm = = [ ecm] [ Vcm ] [ s ] 1[ nh] Frequens shift of 1 nh [ evs] δ= 1 pg= 0.1 ft 1 9 = 1 nh s 31 ears ν + +E ω + t µ + de = h ν = E ω t µ de h δφ δν = πt δφ= 1 mrad (0.06 ), T = 1,000 s δν =160 nh Phase measurement: Repeating measurements ν ν average δν i δν i month = 5,90 ksec: 1 3 n δν total δνi δν total = n δνi 160 nh = = = 1 nh n 590

3 Nuclear Spin Maser with Polaried 19 Xe at low field Artificial feedback through the optical spin detection Singnal (V) Maser signal 0 mg Probe laser beam Feedback coil Phase shifter Time (s) Nuclear spin Pumping laser beam Photo diode Lock-in detection Operation at low magnetic field Small field fluctuation High-sensitive magnetometer Long intrinsic T Frequenc precision is ~ nh for ^4 s, but

4 Dual noble gas spin maser / separated cell - Michigan Univ. - Rosenberr and Chupp, PRL (001) 19Xe precession : locked with reference oscillator No drift 0 = 3.0G δν locked Xe 0 nh 000 s - Run Feedback to solenoid current δ 17 pg Pump bulb Measuring 3He maser frequenc EDM signal T [Rb].0 P maser Rb maser = 10 C / cm 3 µh Maser bulb Long term instabilit δν µh ng free He T maser = 40 C [Rb] 5. P Rb maser < / cm 3

5 Frequenc instabilit in Dual noble gas spin maser Sources of frequenc drift Drift of the applied magnetic field 0 Magnetic field generated from polaried atoms Other species: Longitudinal (7mH, 8. mh) Transverse (58 ph, -81 ph) Same species: Longitudinal (3mH,.5 mh) Transverse (-18mH, -5.5mH) From Rb atoms (40 nh, µh) sol et atoms µ Xe Maser Position : (30mH) T Cavit pulling: (0µH) F T atoms Field gradient (0nH, 36nH) T grad Maser posi. Laser properties Temperature Environmental field Shield drift, noise Mechanical instabilit Cavit pul

6 Spin maser at low magnetic field Low magnetic field : 3 G 30 mg 3 mg? 3 kh 30 H 3 H?,000 s maser run = 3.0G Suppression of δ solenoid and gradient Separation between δ solenoid and δ atoms High sensitivit magnetometer can be used 3He is not introduced If possible, comagnetometer = 30mG Xe Cell 1cell cell T [Rb] 6.7 P maser Rb maser = 70 C / cm 3 T 1K up [Rb] % up ν = 0.1mH T maser = 70 C [Rb] 6.7 P Rb maser δν Xe 1[ mh] / cm 3 T maser = 40 C [Rb] 5. P Rb maser δν < 1.5 < Xe µ [ H] / cm 3 δt maser = 1 mk δν Xe < 0.15 [ nh] (cell ) δν Xe 11[ µh] (1cell )

7 中性子と 199Hg のスピンスピン歳差歳差の同時測定 ν n だけの測定値 0.5 mh ν Hg の値を使って補正 0.5μG 199Hg 磁力計 : 0.6μH = 0.8 ng の精度 電場を反転した際の d meas d <.9 n -6 ecm

8 High sensitivit magnetometers θ φ Incident laser beam ε // ε ε ' Atomic alignment Transmitted laser beam 1 µg

9 Magnetometer for Low freq-spin maser EDM eperiment (1) High sensitivit magnetometers () Rb comagnetometer (3) 3He comagnetometer Rb Xe Magnetometer probe Rb Xe Rb Xe He Rb Maser probe Not comagnetometer Rb magnetometer near maser cell Onl Xe and Rb (small, and not pol) δ = 11 G/ H 0 s run ( if constant ): δ = 1 G Comagnetometer of Rb Onl Xe and Rb (small, and not pol) Probrem of Rb Xe interaction? ( Low densit Xe gas? ) Polariabilit problem δ =? G/ H Comagnetometer of 3He ad S/N for He precession for laser probing? but possible

10 NMOR 実験 setup Photo elastic Modulator (PEM) 4-laer magnetic shield eam splitter Linear polarier- Photo diode 3-ais coil Linear Polarier-1 Eternal Cavit Diode Laser Rb cell Rb reference cell Wavemeter PEM driver&controller Lock-in amplifier Oscilloscope Photo diode Reference(50kH) Signal

11

12 NMOR 測定実験 Wide-field scan = 0.44G Fitting function: gfµ / γ ϕ = gfµ / 1+ γ l l 0 + a + b 回転角度 (mrad) Magnetic field (G) Narrow-field scan Magnetic field(mg) Coherence effect g F fitting Transit effect µ / = 1.146± 0.04 γ 1 = = [s ] 1 ( γ π) [ ms] / 1 Rb coherence time : ~ 8 ms 1/400 の狭い共鳴幅を持つ NMOR スペクトラム しかしまだ試作段階 改善していく

13 ノイズと磁場感度 Rotation angle (mrad) 現在の best spectrum dφ 4.8 d [ rad/g] Lock-in 検波 signal (V) ν = ノイズスペクトラム S( ) Noise floor X T ( ν) Sampling 5 H に smoothing δv T [ V/ H] Field (mg) Frequenc (H) δφ = 3.0 = / 5[ mrad/ H] [ mrad/ H] 感度の見積もり δ = = 8.8 [ G / H] 90 ng / H

14 NMOR signal 幅 幅が以前より狭くなっている ( 半分程度 ); 同じ Rb セル Triad 社 φ5 Triad 社 φ5 Horion 社 φ30 = 1.5 mg 原因は? 光学系 : 関係無し 残留磁場 ( 横成分 ) 消磁前 = + 95 µg = µg = µg 消磁 実験時近辺 = + 3 µg = µg = µg Triad 社 φ5 Horion 社 φ30 = 0.75 mg = 0.47 mg ( γ / π) 1 = 16.[ ms] ( γ / π) 1 = 6.6[ ms] 5 日後 = + 98 µg = + 9 µg = µg

15 残留磁場 有効な消磁の仕方の模索中 文献等も調べる必要 磁気シールドメーカーより : スライダックで手動で 60A 0A にもっていく スライダックで手動消磁 波形発生器 +amp で電流制御 今のところ 電流減衰をゆっくり (~1 分くらい ) 周波数は 0-50 H (60A) より ~300 H (7A) = 180 µg = 114 µg = 49 µg = 35 µg = 37 µg = 13 µg = 00 ~ 50 µg = 90 ~ 1 µg = 60 ~ 0 µg = 84 µg = + 4 µg = 45 µg

16 光学回転検出系 今まで : simple な polarier analer 法 0 θ LP PD Analer 透過強度 : sample E P= E E ( cosθ+ sinθ) = ( 1+ sin θ) ( 1 θ) 正しくは ( 準備中 ): balanced polarimeter 法 0 PD#1 sample PD# 準備中 ±45 方向の偏光成分を観測 各成分の強度差 : E0 E P PD1 PPD = = 回転成分のみのみ検出検出できる 0 ( 1+ sin θ) ( 1 sin θ) E sin θ 0

17 セル作製 作製法を伝えて業者に依頼 研究室で自作準備中

18 新たなたなコーティングコーティング剤について Alken-based コーティング (Alpha Olefin Fraction C0-4) Polariation life time ~ 60 s (for Rb atom) Alken C n H n (n>=) オレフィン系 エチレン系炭化水素 Alkane C n H n+ メタン系 パラフィン系炭化水素 これまでの究極磁場感度 1 pg/ H をさらに 桁向上できる

19 90 ng/ H (30 ng/ H) 3 pg/ H まで ^4 セル内壁緩和 : 0 ms 1 s ( 50) 検出系 : (?) シールド改善 ( 横磁場 磁気ノイズ ): ( >) レーザー周波数 電気ノイズ

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