Detector development for the MuSEUM experiment at J-PARC 1 Sohtaro Kanda / for the MuSEUM Collaboration 2014. 11. 21 at J-PARC
MuSEUM Collaboration 2 MuSEUM : Muonium Spectroscopy Experiment Using Microwave M uSEUM 5 Universities, 3 Institutions 39 people 2014. 11. 21 at J-PARC
The System and Motivation 3 H = a − → I · − → − → J · − → − → I · − → � Hamiltonian of H − µ µ J + µ e + RF term B g J B g H µ Muonium Zeeman Splitting HFS Energy/h Δν ∆ E HFS = ah ∆ ν RF J I H muon electron Magnetic Field (T) Muonium: Objectives: ■ Precision test of bound state QED ■ Bound state of μ + and e- ■ Muon mass determination (Less a ff ected by recoil than Ps) ■ Pure leptonic system ■ Muon g-2 (Composite particle free) ■ Test of Lorentz invariance 2014. 11. 21 at J-PARC
Impact of MuSEUM 4 ■ Precision test of the Bound state QED (12 ppb) ∆ E HFS Exp = 4 . 463302765(53) GHz W. Liu et al. , PRL, 82, 711 (1999) (63 ppb) ∆ E HFS Theory = 4 . 463302891(272) GHz D. Nomura and T. Teubner, Nucl. Phys. B 867, 236 (2013) The most precise test of bound state QED R : From storage ring experiment ■ Muon g-2 λ : From Muonium HFS λ = µ µ (B-field is obtained 540 ppb 26 ppb via proton NMR) µ p The possible clue to the beyond standard model physics MuHFS is one-half of the experimental input 2014. 11. 21 at J-PARC
Test of Lorentz Invariance 5 ■ Principle : Sidereal oscillation of transition frequency cited from R. Bluhm’s slide R. Bluhm, V. A. Kosteleck ý , and C. Da Lane, Phys. Rev. Lett. 84, 1098 (2000) ■ The most recent experimental result V.W. Hughes et al., Phys.Rev.Lett.87, 111804 (2001) 2014. 11. 21 at J-PARC
Proton Radius Puzzle 6 ■ The discrepancy between the muonic hydrogen result and the CODATA value remains with the difference being 7 σ • Proton charge radius r p ≡ − 6 dG E dQ 2 | Q 2 =0 • Zemach radius (convolution of charge and magnetic distribution) Helen S. Margolis, Science, 339, 6118, pp. 405-406 ■ Zemach radius can be obtained from muonium HFS and hydrogen HFS Δ QED: QED correction term Δ s: proton structure term Δ R: recoil term E_F: Fermi energy S. J. Brodsly et al ., Phys. Rev. Lett. 94, 022001 2014. 11. 21 at J-PARC
Our Goal of Precision 7 (12 ppb) W. Liu et al. , PRL, 82, 711 (1999) (120 ppb) µ µ /µ p = 3 . 18334513(39) (120pp Error Budget (frequency sweep, μ μ / μ p ) 92% of uncertainty is statistical error Understanding of systematics is limited by measurement time Our goal : 200 times of statistics and minimization of systematic uncertainty 2014. 11. 21 at J-PARC
Approach to Improvement 8 Error Budget (frequency sweep, μ μ / μ p ) and our approach to improvement Coaxial pipe for RF transmission Measurement at low gas density (Use of a longer cavity) Online/Offline beam profile monitor Highly uniform B-field and Precision NMR probes Highest intensity pulsed muon beam at J-PARC The Keys: Calibration runs for well understanding in systematic errors Requirement: High rate capable positron counter 2014. 11. 21 at J-PARC
Overview of the MuSEUM 9 Upstream Counter 1. Muonium formation Experimental 2. RF spin flip Procedure 3. Positron asymmetry Muonium decay e+ poralized muon beam RF Tuning Bar 100% ← RF Cavity Online Beam Monitor Positron Counter 2D cross-configured Segmented Kr Gas Chamber fiber hodoscope scintillation counter 2014. 11. 21 at J-PARC
Detectors for the MuSEUM 10 ■ Downstream positron counter ■ Online beam profile monitor ‣ Spectrometer for ‣ Fiber hodoscope HFS measurement for beam stability ‣ Segmented monitoring scintillator+SiPM ‣ Pulse by pulse ‣ High rate capability measurement of is required profile and intensity ■ Upstream positron counter ■ O ffl ine beam profile monitor ‣ IIF+CCD beam ‣ Spectrometer for imager for HFS measurement ‣ Additional counter muon stopping distribution for ‣ Measurement for asymmetry syst. uncertainty measurement suppression 2014. 11. 21 at J-PARC
Detectors for the MuSEUM 11 ■ Online Beam Profile Monitor : 2D minimum destructive muon monitor 2D beam profile monitor for stability monitoring Online measurement (minimum destructive) Minimum amount of material is required 100 mm Scintillating fiber+SiPM (HPK MPPC) Prototype was developed and tested M. Tajima et al, Japan Phys. Soc. Ann. Meeting (2013) S. Kanda, et al ., J-PARC2014 proceedings ■ Positron Counter : Main detector for positron counting Segmented scintillation counter for spectroscopy High-rate capability is required (~3500 e+/pulse) 300 mm Plastic scintillator + SiPM (HPK MPPC) Prototype was developed and tested S. Kanda, RIKEN APR Vol. 47 (2014) S. Kanda, KEK-MSL Progress Report 2013 (2014) S. Kanda, The 8th g-2/EDM Collaboration Meeting (2014) 2014. 11. 21 at J-PARC
Offline Muon Beam Monitor 12 ■ Muon stopping distribution is measured by an o ffl ine muon beam monitor contains IIF+CCD e+ Beam e- μ γ Kr Gas CCD Imaging Intensifier Scintillator Acrylic Block Development : T. U. Ito et al ., NIM A 754 (2014) vertical position (mm) vertical position (mm) vertical position (mm) Upstream Stopping center Downstream horizontal position (mm) horizontal position (mm) horizontal position (mm) Simulated muon stopping distribution 2014. 11. 21 at J-PARC
DAQ Schematic 13 Muon Beam Hold Beam Kicking Online Monitor Profile Monitor Pulse (64ch) Peak Hold ADC or WFD 25 Hz double pulse 100 M μ /s@1 MW Common Start Positron Counter Data Writing (2000ch) Multi Hit TDC Time Stamp NMR Probe Gas Pressure Event Builder RF Power Temperature Environmental Monitoring Variables 2014. 11. 21 at J-PARC
System Components 14 Requirements Current setup Minimum beam destruction Muon Beam scintillation fiber+MPPC (muon energy~4 MeV) Profile Monitor EASIROC+home made DAQ High uniformity (~100 mm) (64ch) (KEK, Tohoku, Osaka) High stability (200 days) High rate capability segmented scintillator+MPPC Positron Counter (4M μ /pulse) Kalliope+DAQ developed by KEK CRC (2000ch) High stability (S. Y. Suzuki) NMR Probe Gas Pressure High precision individual monitors (NMR: 60 ppb, RF power: 0.1%) Lab view based DAQ Combination of several monitors (T. Mizutani) RF Power Temperature DAQ Framework MIDAS based integrated DAQ (under study) 2014. 11. 21 at J-PARC
Development Strategy 15 Prototype development Readout circuit evaluation Monte-Carlo Simulation Event structure Basic characteristics of Analog signal Hit map, Hit rate MPPC+scintillator detector Circuit response Energy deposit Photon yield, event rate Digital signal, DAQ Background Development of realistic simulator for the MuSEUM experiment Feedback to detector designing and upgrade Estimation of systematic uncertainties 2014. 11. 21 at J-PARC
MLF 2013B Beam Test 16 2014. Feb. 24-26 (Halfway stopped due to LINAC trouble) Test experiment for a positron counter prototype Photo credit: H. A. Torii 2014. 11. 21 at J-PARC
MLF 2014A Beam Test 17 2014. Nov. 8-9 Test experiment for an online beam profile monitor prototype and an offline beam profile monitor Photo credit: H. A. Torii and Y. Ueno 2014. 11. 21 at J-PARC
Online Beam Profile Monitor 18 ■ 100 um φ Scintillation fiber+MPPC+EASIROC(ASD+peak hold ADC) Cross-configured fiber hodoscope 100 mm × 100 mm detection area 100 um fiber + resin (total 150 um) 100 mm ■ Stability of beam profile and relative beam intensity are MPPC inside measured pulse by pulse (in high fiber B-field) array ■ Prototype was developed and a beam test was performed in Nov. 2014 ■ Photon yield and stability were evaluated ■ Readout: NIM-EASIROC m u 0 0 1 N. Ishijima et al , Japan Phys. Soc. Autumn. Meeting (2013) Stephane Callier et al ., Physics Procedia Vol. 37, NIM-EASIROC Array of 100 um fiber 1569-1576, Proceedings of the TIPP 2011 (2012) 2014. 11. 21 at J-PARC
100 um Scintillation Fiber Array 19 Prototype of Front Beam Profile Monitor 100 mm 4 channels prototype for light yield measurement One dimensional array of 100 um scintillation fiber Fibers were arrayed on 25 um polyimide film Resin 25 um (175 um this time) Fiber 100 um Polyimide 25 um 2014. 11. 21 at J-PARC
MPPC and Light Connection 20 50 mm MPPCs were mounted on a PCB Bound fiber (0.9 mm φ ) is directly connected to MPPC’s active area MPPC spec: 1.3 mm × 1.3 mm active area, 50 um pitch, 667 pixels 2014. 11. 21 at J-PARC
Profile Monitor Prototype 21 MPPC 1.3 mm × 1.3 mm 100 um scintillation fiber on 25 um polyimide film 100 mm Array of 100 um scintillation fiber 100 mm × 12 mm detection area Prototype of Front Beam Profile Monitor 2014. 11. 21 at J-PARC
Profile Monitor Beam Test 22 ■ Beam test setup and result MPPCs Beam Preliminary Fiber Array Data taking was triggered by Photon number distribution beam sync. pulse Muon beam was detected by the prototype 2014. 11. 21 at J-PARC
Profile Monitor Beam Test 23 ■ Extrapolation to the H-Line intensity D-Line 0.2 MW (3e6 μ /s) H-Line 1 MW (1e8 μ /s) Preliminary 10 um pitch MPPC (16675 pixel) can be the solution for H-Line@1 MW case 2014. 11. 21 at J-PARC
Profile Monitor Beam Test 24 ■ Beam intensity monitoring Preliminary Preliminary Sigma of ADC ~ 1% (summation of four channels) Prototype is sensitive to ~3% beam fluctuation (three sigma) Proton beam current was stable in ~0.4% during measurement 2014. 11. 21 at J-PARC
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