Download - Sohtaro Kanda - KEK
2016. 10. 13 at J-PARC dsys workshop
1
Instrumentation for experiments with high-intensity pulsed muon beam MuSEUM experiment
Sohtaro Kanda /[email protected]
2016. 10. 13 at J-PARC dsys workshop
Production of Muon 2
■ Proton driver
■ Parity violating pion decay
proton graphite
positive pion
negative pion
pionmuon
4 MeV at pion rest framespin polarized
neutrino
2016. 10. 13 at J-PARC dsys workshop
Decay of Muon 3
■ Parity violating muon decay
muon positronneutrinos
µ+ ! e+ + ⌫e + ⌫µ
Positron energy spectrumPositron energy/52 MeV
Cos
ine
of e
mis
sion
an
gle
to m
uon
spin
Positron angular asymmetryPositron energy (MeV)
2016. 10. 13 at J-PARC dsys workshop
Muon Spin Dynamics 4
■ Decay positron time spectrum
In the presence of B-field, muon spin rotates with Larmor frequency
!µ = � qgµ2mµ
Bmuon
spin
B-field Spin relaxation occurs due to the B-field distribution
■ Muon spin rotation and relaxation
G. Bennett, et al., PRD 73 (2006)
Muon is a powerful probe for local magnetic field
thanks to its spin dynamics and self-analyzing feature
2016. 10. 13 at J-PARC dsys workshop
Pulsed and Continuous Muon Beam 5
■ Pulsed beam : J-PARC, RAL
■ Continuous (DC) beam : PSI, TRIUMF, MuSIC
timerandom timing
■ Higher event rate■ Higher S/N■ Limited timing resolution■ Pulse synchronized trigger■ Ensemble average
■ Less event rate■ Less S/N■ High timing resolution■ Necessity of trigger counter■ Event-by-event analysis
40 ms
time
100 ns
600 ns
...
periodic timing
2016. 10. 13 at J-PARC dsys workshop
Muon Precision Physics 6
■ Measured muon properties
Method Beam Precision Stat. Syst. Ref.
Mass Muonium HFS spectroscopy
DC (Chopped) 120 ppb 117 ppb 38 ppb Liu
1999
Mean lifetime
Decay positron counting
DC (Accumulated)
1 ppm 0.96 ppm 0.32 ppm Tishchenko 2013
g-2
Decay positron
tracking in storage ring
Pulse 540 ppb 463 ppb 283 ppb Bennet 2007
2016. 10. 13 at J-PARC dsys workshop
Muon Precision Physics 7
■ Muon as a probe for new physics search
Method Beam Limit Exp.
μ+->e+γ 52.8 MeV e+ and γ back to back DC Br<4.2x10-13 PSI MEG
2016
μ-N->e-N 105 MeV e- DC Br<7x10-13 PSI SINDRUM-II
2006μ->eee e- tracking DC Br<1.0x10-12 PSI
SINDRUM-I 1988
g-2 μ+ in storage ring Pulse Δaμ(Exp.-Th.)=289(80)x10-11 BNL E821 2006
EDM μ+ in storage ring Pulse dμ<1.9 x 10-19 e cm BNL E821 2009
Lorentz Violation
μ+e- spectroscopy DC 2x10-23 GeV LAMPF
1999μ+e- - μ-e+ conversion e+ e- annihilation DC P<8.3x10-11 PSI
1999
2016. 10. 13 at J-PARC dsys workshop
Towards Higher Precision 8
■ Precision muon physics with continuous muon beam has been limited by statistical uncertainty.
■ When statistical precision is improved severalfold, systematic uncertainty limits the measurement precision
■ To explore the new frontier of precision muon physics with high-intensity pulsed muon beam, both ■ High-rate capable detector ■ Precision control and monitoring of environment ■ are of importance
■ In this talk, as an example of new generation of muon precision measurement, MuSEUM experiment is introduced.
2016. 10. 13 at J-PARC dsys workshop
Muonium Energy Levels 9
0 0.5 1 1.5 2 2.5 310−
8−
6−
4−
2−
0
2
4
6
8
10
([0]*0.25+0.5*[1]*x)*[2]([0]*0.25+0.5*[1]*x)*[2]
Magnetic field (T)
Ener
gy L
evel
/HFS
muon electronB-Field
RF
⌫12 � ⌫34 / µµ/µp
■ Direct measurement at zero magnetic field (δν) ■ Indirect measurement under a high magnetic field (ν12 and ν34) ■ Our goal is x10 improvement for both experiments
Muonium HFS δν=4.463 GHz
⌫12 = 1.906 GHz
⌫34 = 2.556 GHz
�⌫ = (16
3↵2R1cgeg
0µ)(1 +me/mµ)
�3(1 + �QED)or
⌫12 + ⌫34 = �⌫
2016. 10. 13 at J-PARC dsys workshop
MuSEUM Experiment 10
Online Beam Monitor 2D cross-configured
fiber hodoscope
Positron Counter Segmented
scintillation counter
Upstream Counter
decay e+
polarized muon beam RF Tuning Bar
RF Cavity
Kr Gas Chamber
Experimental Procedure
1. Muonium formation 2. RF spin flip 3. Positron asymmetry
“Zero” or High B-Field
Muonium
2016. 10. 13 at J-PARC dsys workshop
MuSEUM Instruments 11
■ Positron counter
‣ Fiber hodoscope‣Beam monitoring‣Minimum amount of
material is required
‣Segmented scintillator+SiPM‣Positron counting‣High rate capability
is required
‣ IIF+CCD beam imager‣ 3D muon stopping
distribution‣Beam tuning
‣ Lq. scint.+WFD‣Neutron/Gamma/
Positron discrimination‣Self trigger
■ Online beam profile monitor
■ Offline beam profile monitor ■ Background monitor
2016. 10. 13 at J-PARC dsys workshop
DAQ Overview 12
Beam Sync. Pulse
Online Beam Profile Monitor
Positron Counter
Event Builder
Online Monitor
RF Power
B-Field Gas Pressure
Temperature
Data Writing
25 HzPeak Holding ADC
Multi Hit TDC
Environmental Monitors
Common Start
Hold
Time Stamp
2016. 10. 13 at J-PARC dsys workshop
Positron Counter 13
■ Scintillator pixel+SiPM+Kalliope (ASD+multi-hit TDC)
■ Two layers of segmented scintillation counter ■ 10 mm×10 mm× 3 mmt unit cell , 240 mm × 240 mm detection area ■ High rate capability and tolerance to a high magnetic field
240
mm
576 ch/layer x 2 layers Hamamatsu MPPC 1.3 mm x 1.3 mm active area
50 μm pixel pitch
10 mm
3 mmt
S. Kanda, PoS(PhotoDet2015) 039 (2016)
2016. 10. 13 at J-PARC dsys workshop
Frontend Electronics 14
M. M. Tanaka, K. M. Kojima, T. Murakami, S. Kanda, C de la Taille and A. Koda,“MPPC frontend module for muon spin resonance spectrometer” (to be published)
Fast
■ Kalliope: KEK Advanced Linear and Logic-board Integrated Optical detectors for Positrons and Electrons
ASIC FPGA
MPPC input
Trigger input
Ethernet
Power supply
HV input is on the other side
■ 32ch inputs for MPPC■ ASIC implemented amplifier, shaper, discriminator■ FPGA programmed multi-hit TDC (common start)■ SiTCP data transfer
2016. 10. 13 at J-PARC dsys workshop
MPPC on PCB 15
■ Eight layered PCB for MPPC mount
Micro strip line impedance was adjusted to 50 Ohm
Circuit Design
PCB with mounted MPPCs
2016. 10. 13 at J-PARC dsys workshop
White Paper Mask 16
■ White paper mask for light diffused and position marker
20 40 60 80 100 1200
5
10
15
20
25
(adc[25]-787.5)/20.0 {adc[30]>850&&adc[28]>850}
h25peEntries 710
Mean 62.48
RMS 23.25
Integral 324
(adc[25]-787.5)/20.0 {adc[30]>850&&adc[28]>850}
20 40 60 80 100 1200
2
4
6
8
10
12
14
16
18
20
22
(adc[23]-782.5)/20.0 {adc[30]>850&&adc[28]>850}
h23peEntries 710
Mean 67.67
RMS 25.29
Integral 332
(adc[23]-782.5)/20.0 {adc[30]>850&&adc[28]>850}
White paper# of photon # of photon
Black paper
20 40 60 80 100 1200
10
20
30
40
50
60
70
(adc[25]-787.5)/20.0 {adc[30]>850&&adc[28]>850}
h25peEntries 1260
Mean 35.78
RMS 21.73
Integral 681
(adc[25]-787.5)/20.0 {adc[30]>850&&adc[28]>850}
20 40 60 80 100 1200
10
20
30
40
50
(adc[23]-782.5)/20.0 {adc[30]>850&&adc[28]>850}
h23peEntries 1260
Mean 52.24
RMS 24.55
Integral 641
(adc[23]-782.5)/20.0 {adc[30]>850&&adc[28]>850}
Photo detection comparison between black and white paper mask
White paper mask on a PCB as position marker and reflector
2016. 10. 13 at J-PARC dsys workshop
Reflector Film 17
■ Thin polymer film with folding for light reflection
Laser cut ESR ESR ribbons to be inserted
Folded film bands are inserted between sides of scintillators
N. Inadama et al., IEEE Transactions on Nuclear Science, 51, 1 (2004)
2016. 10. 13 at J-PARC dsys workshop
Positron Detector Assembly 18
2016. 10. 13 at J-PARC dsys workshop
Assembled Positron Detector 19
Top cover was placed for scintillator protection
240 mm
ESR top coverFully assembled scintillator segments
2016. 10. 13 at J-PARC dsys workshop
Installation 20
Kr Gas Chamber (RF Cavity inside)
Three layers of magnetic shield
Positron Counter w/Al AbsorberFiber Beam Profile Monitor
Muon Beam
200 mm
2016. 10. 13 at J-PARC dsys workshop
Hit Map on the Detector Plane 21
horizontal position (cm)vertical position (cm)
2016. 10. 13 at J-PARC dsys workshop
Time Spectrum 22
Time spectrum of coincidence hitInstantenious event rate was 10 MHz at maximum
30 coincidence hit per pulse
2016. 10. 13 at J-PARC dsys workshop
High-Rate Capability 23
time (ns)
Cou
nt -
Fit /
Fit
0 2000 4000 6000 8000 100001−
0.8−
0.6−
0.4−
0.2−
0
0.2
0.4
0.6
0.8
1
0 2000 4000 6000 8000 100001−
0.8−
0.6−
0.4−
0.2−
0
0.2
0.4
0.6
0.8
1
0 2000 4000 6000 8000 100001−
0.8−
0.6−
0.4−
0.2−
0
0.2
0.4
0.6
0.8
1
0 2000 4000 6000 8000 100001−
0.8−
0.6−
0.4−
0.2−
0
0.2
0.4
0.6
0.8
1
0 2000 4000 6000 8000 100001−
0.8−
0.6−
0.4−
0.2−
0
0.2
0.4
0.6
0.8
1
0 2000 4000 6000 8000 100000.2−
0.15−
0.1−
0.05−
0
0.05
0.1
0.15
0.2
5% of pileup loss at the highest event rateSystematic uncertainty due to the pileup loss is negligible
2016. 10. 13 at J-PARC dsys workshop
24Fiber Beam Profile Monitor
100
mm
MPPC inside
fiber array
■ Cross-configured fiber hodoscope with SiPM readout ■ To be placed in front of the target chamber ■ Online monitoring of beam profile and intensity ■ Minimum amount of material is required
S. Kanda, RIKEN Accelerator Progress Report Vo. 48 (2015)
2016. 10. 13 at J-PARC dsys workshop
Scintillation Fiber Array 25
100 m
m
100 um
Resin 25 μFiber 100 μPolyimide 25 μ
40 fibers are bundled for a ch. and connected
to MPPCFiber array layer structure
2016. 10. 13 at J-PARC dsys workshop
Fiber Thickness Uniformity 26
layer thickness (um)
3% of Uniformity Total thickness including fibers, resin, and substrate
2016. 10. 13 at J-PARC dsys workshop
Assembled Fiber Monitor 27
2016. 10. 13 at J-PARC dsys workshop
Installation 28
Kr Gas Chamber (RF Cavity inside)
Three layers of magnetic shield
Positron Counter w/Al AbsorberFiber Beam Profile Monitor
Muon Beam
200 mm
2016. 10. 13 at J-PARC dsys workshop
Measured Beam Profile 29
■ Muon beam profile was measured by fiber beam profile monitor
■ Correction for light attenuation is to be applied
Horizontal projection Vertical projection
Horizontal position (mm)40− 20− 0 20 40
Sum
mat
ion
of A
DC
cou
nts
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000 / ndf 2χ 345 / 11
Prob 0
Height 42.21± 4339
Mean 0.1463±0.7426 −
Sigma 0.3196± 19.17
Floor 43.15± 1544
/ ndf 2χ 345 / 11
Prob 0
Height 42.21± 4339
Mean 0.1463±0.7426 −
Sigma 0.3196± 19.17
Floor 43.15± 1544
Vertical position (mm)40− 20− 0 20 40
Sum
mat
ion
of A
DC
cou
nts
1500
2000
2500
3000
3500
4000
4500
/ ndf 2χ 154.1 / 12
Prob 27− 8.469e
Height 132.2± 3537
Mean 0.186± 0.1341
Sigma 1.005± 27.37
Floor 143.1± 915.7
/ ndf 2χ 154.1 / 12
Prob 27− 8.469e
Height 132.2± 3537
Mean 0.186± 0.1341
Sigma 1.005± 27.37
Floor 143.1± 915.7
σx=19.17 mm σy=27.37 mm
2016. 10. 13 at J-PARC dsys workshop
Beam Intensity Stability 30
Trigger (25 Hz)
ADC
sum
.
Detailed analysis is in progress
2016. 10. 13 at J-PARC dsys workshop
Summary 31
■ Precision muon physics with continuous muon beam has been limited by statistical uncertainty.
■ Experiment with high-intensity pulsed beam has great potential to improve precision muon physics.
■ To explore a new frontier of precision physics with high-intensity pulsed muon beam, ■ High-rate capable detector and ■ Precision control and monitoring of environment ■ are essential.
■ MuSEUM has got underway as a new generation of precision measurement with the highest intensity pulsed muon beam.
Supplements
32
2016. 10. 13 at J-PARC dsys workshop
Environment Monitors 33
Object Instrument
Static B-Field Fluxgate probe
RF Power Thermal power sensor
Gas Pressure Capatitance gauge
Gas Purity Q-Mass
Temperature Thermocouple
2016. 10. 13 at J-PARC dsys workshop
Hydrogen Atom Spectroscopy 34
■ 1913: Bohr model
■ 1916: Fine structure (FS)
■ 1928: Dirac eq.
■ 1935: Hyperfine structure (HFS)
■ 1947: Lamb shift (QED)
Lamb Shift
1S-HFS
FS2S1/2
F=1
F=0
F=1
F=0
2P3/2
2P1/2
1S1/2
F=1F=1
F=0
F=2
2S-HFS
■ The progress of hydrogen atom spectroscopy had brought evolution of quantum mechanics
2016. 10. 13 at J-PARC dsys workshop
Positron Detector 35
2016. 10. 13 at J-PARC dsys workshop
MPPC on PCB 36