Present status of Mu HFS experiment at J-PARC

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Presentation transcript:

Present status of Mu HFS experiment at J-PARC K.Shimomura (KEK) Koichiro.shimomura@kek.jp 2019/1/2 Lepton moments 2014

K.Shimomura (KEK) Koichiro.shimomura@kek.jp Present status of MuSEUM at J-PARC MuSEUM (Muon Spectroscopy Experiment Using Microwave ) K.Shimomura (KEK) Koichiro.shimomura@kek.jp 2019/1/2 Lepton moments 2014

Mu ground state e- m+ e- m+ 4463 MHz DEHFS: Mu Hyperfine Structure Zeeman Splitting e- m+ 4463 MHz e- m+ Pure letron = M point partcile n12+n34=DEHFS n12-n34 ∝ mm/mp 2019/1/2 Lepton moments 2014

Muonium ground state hyperfine interval measurement is related to ・Precise check of bound QED ・ Basic input parameter for muon g-2 experiment ・Test of CPT and Lorentz Invariance 2019/1/2 Lepton moments 2014

Recent Summary of exp. and th. (by D.Nomura) nHFS(exp) 4463.302 765(53) MHz [12 ppb] The. nHFS(theory) 4463.302 891 (272) [63 ppb] nHFS(QED) 4463.302 720 (253)(98)(3) (mm/me)(QED)(a) nHFS(weak) -65 nHFS(had v.p) 232(1) nHFS(had. h.o) 5 QED calculation →10 Hz accuracy within a few years. (by Eides) 2019/1/2 Lepton moments 2014

Ratio of gyromagnetic moment mm/me mm/mp, am, mp/mB 206.7682670(55) [27 ppb] Mu 1S-2S mSR in Br2 MuHFS Breit Rabi MuHFS Dn(theory) Muon mass (CODATA2010) determiend by MuHFS(LAMPF1999) 2019/1/2 Lepton moments 2014

Why Muonium HFS measurement is so important？ g-2 E821(BNL) 0.5ppm 3s deviation -measurement of the deviation of muon spin direction(ws) and muon momentum direction(wc) wa∝(g-2)/2=am　　 -The ratio to proton NMR frequency is important! 　mm/mp accuracy from direct measurement 120ppb　 W. Liu et al., Phys. Rev. Lett. 82, 711 (1999). q am an independent precise muon mass measurement is required ⇒ From g-2 strage ring From Muonium HFS 2019/1/2 Lepton moments 2014

Test of CPT and Lorentz Invariance CPT broken Theory⇒Lorentz symmetry is broken O.W.Greenberg PRL89(2002)231602 CPT violation search Ex., Muon difference gm+　/gm- 10-8 gm-2/MuHFS precise measurement Lorentz symmetry violating term in STE Lagrangian b Corresponding MuHFS Dn12/34 These value might change in sidereal time (23h56m) b3m/p=-dDn12=dDn34 ~ LAMPF Exp.　Figure of Merit Plank scale sensitivity mm/MP～10-20 2019/1/2 Lepton moments 2014

Method 2019/1/2 Lepton moments 2014

Improvement of statistics 107 ppb Statistics Magnetic field 56 ppb Kr Density/Pressure 11 ppb RF power 9.6 ppb d(mm/mp) Muon stopping 13 ppb d(Dn) 10.9 ppb Statistics 4.4 ppb Kr Density/Pressure 1.0 ppb RF power 0.96 ppb Muon stopping LAMPF exp. x200 LAMPF DC 107 /s total 1013 J-PARC/MUSE Pulse 1x108 /s H-Line total 2x1015 2019/1/2 Lepton moments 2014

Systematic error LAMPF d(mm/mp) J-PARC MUSE x200 Statistics 107 ppb Intense pulsed beam DC 107/s total 1013 Pulse 108/s total 2x1015 Uniform Field (<1 ppm) + Stability Magnetic field 56 ppb Beam profile moniter (accuracy～1 mm) Muon stopping 13 ppb accuracy 5 mm Kr Density/Pressure 11 ppb Long RF cavity （～300 mm) Cavity length 159.73mm RF power 9.6 ppb RF Input：Coaxial cable 2019/1/2 Lepton moments 2014

Key Component Intense Muon Beam Line MuHFS S.C.Magnet RF cavity Kr chamber Positron Detector Profile Monitor Systematic Error Study Kawamura ,Toyoda Sasaki,Mizutani,Ueno,Higashi Tanaka,Matsuda Tanaka,Torii,Strasser Knada,Fukao,Mibe Tajima,Toyoda,Ito Tanaka, Knada,Ishida 2019/1/2 Lepton moments 2014

Material and Life Science J-PARC Facility (KEK/JAEA) Kawamura,Toyoda, LINAC 3 GeV Synchrotron Neutrino Beam To Kamioka Material and Life Science Facility Main Ring (30 GeV  50 GeV) Hadron Hall Bird’s eye photo in Feb. 2008 2019/1/2 Lepton moments 2014

S.C. Magnet (MRI magnet) Sasaki,Mizutani,Ueno 0.03 ppm/h 35cm DSV <1ppm Effective bore radius 680mm Multi NMR probe for precise field maeasurement 2019/1/2 Lepton moments 2014

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RF cavity Tuning Tuning Tanaka,Matsuda,Torii 2019/1/2 Lepton moments 2014

Improvement from LAMPF Cavity Length The transition frequency of muonium in gas vary with the gas pressure due to atomic collision between Mu and Kr. ⇒Fitting 0.8 and 1.5 atm data, old quadratic dependence parameter was used (Los Alamos) ⇒We need the data lower pressure for improved fiting 2019/1/2 Lepton moments 2014

RF cavity MWS simulation 3D CAD Test Cavity 2019/1/2 Lepton moments 2014

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Positron Detector Kanda,Mibeuda,Kojima 2019/1/2 Lepton moments 2014

Profile Monitor Tajima,Toyoda Ito@JAEA Kr chamber RF cavity 3rd maimum systemitic error 13 ppb In Los Alamos exp. accuracy 5 mm　→　1 mm TBPM FBPM 　2D monitor (pulse by pulse) 　less than 300 mm thickness in total 　work under a magnetic field 　3D monitor (time by time) 　0-2 atm Kr gas pressure 　size < 200 mm (RF cavity ) 2019/1/2 Lepton moments 2014

FBPM MAPMT Plastic Scintillator 0.15 mmt Challenge 1 Uniform muon beam range uniform thickness MA PMT Challenge 2 MA PMT Enough light transmission light guide or fiber Optical fiber MAPMT 2019/1/2 Lepton moments 2014

FBPM Proto type fiber Sheet plastic scinti. light guide 6 mm width, 0.15 mmt w.Al 0.15 mmt w.o.Al fiber light guide Sheet plastic scinti. 6 mm width, 180 mm length 5m Fiber 5 m Multi anode PM Check List 0.2 mmt w.Al 0.2 mmt w.o Al 0.15 mmt w.Al 0.1 mmt w.o Al Acryl Light guide Effect of Al coating Thickness dependence light guide selection position dependence 2019/1/2 Lepton moments 2014

Beam Profile Measurement at D line 1mm　accuracy is achieved.. 2019/1/2 Lepton moments 2014

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TBPM (IIT muon beam profile monitor) Plastic scintillator EJ-212, f130, t2 Image intensifier (IIT) Black sheet Muon beam Lens CCD camera vacuum Lens Flypast chamber (head) 100ns DG535 Guide (cardboard) Acryl. flange 2019/1/2 Lepton moments 2014

TBPM Setup Scintillator plate Scintillation light lenz ＩＩＴ lenz ＣＣＤ 2019/1/2 Lepton moments 2014

Image of Muon Beam at D line Y X 2019/1/2 Lepton moments 2014

3D Image in Air 2019/1/2 Lepton moments 2014

Systematic Error Tanaka,Kanda,Ishida 2019/1/2 Lepton moments 2014

Systematic Error Accuracy v12 and v34 HFS mm/mp Magnetic Field 60ppb Tanaka,Kanda,Ishida Accuracy v12 and v34 HFS mm/mp Magnetic Field 60ppb 0.0ppb 30ppb RF power 0.10% 10Hz 2.0ppb 20ppb Kr gas temp. 0.1度 < 1Hz 0.2ppb 2ppb Kr gas pressure 0.01hPa 1Hz 0ppb H impurity <50ppm 0.5ppb Quaduratic dependence 5Hz 1.0ppb 5ppb Muonim position(x,y) 1mm 3Hz 0.6ppb 6ppb Muonim position(z) Beam line 10(e-4) Detector pile up 2.5Hz 0.3Hz <0.1ppb 3ppb <1ppb 2019/1/2 Lepton moments 2014

Summary and Next Step Total systematic error is roughly estimated HFS 2.4ppb Magnetic moment 38ppb RF power →　need more study 2019/1/2 Lepton moments 2014

M.Aoki, Y.Fukao, A.Higuchi, Y.Higashi Collaboration List M.Aoki, Y.Fukao, A.Higuchi, Y.Higashi H.Iinima, Y.Ikedo, K.Ishida, M.Iwasaki, R.Kadono, S.Kanda, O.Kamigaito, D.Kawall, N.Kawamura, K.Kojima, A.Koda, K.Kubo, R.Okubo, Y.Matsuda, T.Mibe, Y.Miyake, T. Mizutani, K.Nagamine, K.Nishiyama, T.Ogitsu, P.Strasser N.Saito, K.Sasaki, K.Shimomura, M.Sugano, M.Tajima, K.Tanaka, D.Tomono, A.Toyoda, K.Torii, E.Torikai, K.Ueno, Y.Ueno, M.Yoshida, A.Yamamoto 2019/1/2 Lepton moments 2014

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Close relationship to gm-2 am=(gm-2)/2 Exp. 0.001 165 920 89 (68) [580 ppb] am=R/(l-R) Rexp(gm-2): 500 ppb 3.2 s lexp(MuHFS): 120 ppb The. 0.001 165 918 28 (49) [420 ppb] 2019/1/2 Lepton moments 2014