MEG IIúõ÷<*PZ4/+Z<\ßn!í½
PU\ÐI\Q'Æ¢ÚæpMEG II positron timing counter- construction, calibration, and performance evaluation byusing high intensity muon beamµdÅÒÈÏÌ ÃÅªÓÐÃÅ öÈÏ;Z<\ ¸ÈÏ` u
JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page:1/39

ÇÜxl ůź&ƌįØ ƏǐygZ{ey~`~&Ű7
Ø MEG IIêǘÈÏÙ¯l êŁƔØ ǊǐãU?o{ID@{U~Ø êŁƔ®óí½­¾òÇ»ßnl ĮǅƱńĨŊ&ǄŦ
Ø y~N~ƱńŊØ oOAxƱńŊl ßĂÿot~Ɓãc~p:ŠċƍƠ: Pilot Run 2016
Ø SWZ=WgØ ĮǅƱń&ƽŠØ Įǅ²ƚƍ&ƠPU\ÐI\Q'Æ¢Úæp

Pilot Run 2016Öël ƆƨØ ć&ƦǕ#ôĵØ -#/JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page:2/39

ÈÏÙ¯®óí½­¾
òÇ

»ßn

PU\ÐI\Q'Æ¢Úæp

Pilot Run 2016

ÈÏÙ¯

JPS Autumn Meeting 2017 (14aS36-7)

ÖëMitsutaka Nakao  Page:

3/39Û÷XMAZKX\F\É%Ⅰ

ⅡQuarkdsu

Ⅲbc

Charged Lepton
MEG

e ûμ

Charged Lepton Flavour Violation, CLFVl ǅŐÉ', ƏǐygZ{SHU~%
!&.ķŦƗ.

tl ]t~Zw_ę½:Ì/!0²õŇ'ǒü%ñ.

B factoryûτNeutrinoνeνμντ

T2K, MINOS, OPERA, etc

l ŀŖŝƨ:Ƭ 6Þ&ŝƨ"', ƘœÇƍ$²õŇ
O(10-12)O(10-14)

ƛ7!6:ƏǐygZ{ey~`~&Ű7&ŦƗ = ħŚŝ&ƟĖ!!
JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page:

4/39

μ→eγÃÅS@Wo
SUSY-Seesaw JHEP11(2006)090

¹łª Nucl. Phys. B 906 (2016) 561	

✓13 ⇠ 9	SUSY-GUT Phys. Rev. D 88, 075005(2013)l Þ&ħŚŝrYx
²õŇ:ď.

Ƙœ"6yix&l 2016þ, MEGêǘ'ĲƄƆļ:ŦƑ:
4.2×10-13(90% C.L.)
l MEG IIêǘ'4×10-14:ŨĘ!Ŗ¨.	

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page:

5/39

MEG II ú: Å
SIGNALBACKGROUND

+accidental γ

Radiative Muon Decay

normal muon decayl ÊĮ%ÅîĨË(θeγ=180°,Tγ=Te)l B^xG~'Á²
(Eγ,Ee=52.8MeV)áêl ø Ġǀŧl accidental γ&ÄÑ',
1.Annihilation in Flightl ƸƇŧ}ßĂÿot~C{c~pl ǙB^xG~}Ɖ}Įǅ²ƚƍ:0l Ǚy~ZŞÚ"ƺŠ" 6Ľ±Ï

or

2.RMD

Ľ±Ï

→ MEG/MEG IIêǘ @ m~x}OAv~ůźĒ(Q?Q)
JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page:

6/39

MEG I"MEG IIAt Paul Scherrer Institutin Switzerlandl MEGêǘ%36·ǈ: 10 £ġÎ6,

Đÿ 4 x 10-14 "CLFV(μ+→e+γ) :Ěƃ
l c~pĂÿ 2 £γe+μ+l ­!&Ľ±Ï&Ŗ¨l ­!&²ƚƍ: 2 £ġÎ
JPS Autumn Meeting 2017 (14aS36-7)

2018 %èMitsutaka Nakao  Page:

7/39

At Paul Scherrer Institutin Switzerland

MEG II ¹yÀk1;EZ0ZO×¹y
-13aU33-3 (Čš)-13aU33-7 (ëÖ)-13aU33-9 (ñ÷)-13aU33-10 (ĺŗ)γ-13aU33-1 (ó)-13aU33-2 (æƗ)-14aS36-7 (ó)î¹ye+µ+

BVKA=,ZF\-14pS35-8 (ëÖ)

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page:

8/39

´ÈÏ7\Wĸůź&îƩl ǊǐãU?o{ID@{U~Ø Ǌǐã&Įǅ:ǙƂÿ%œé6.
→Ɩ$`WHIv@{["6§ŦƩ:ő4/%ǁƖ.

´ÈÏ7\Wl MEG I&TC:2£ġÎ6Įǅ²ƚƍ: 35 ps:Ƽđ6#.
&/%l êŁ:Ɣ,l ĮǅƱńĨŊ:ǄŦ,l MEG IIêǘ#ÊŞÚ"ßĂÿot~Ɓãc~p:Š!ċƍƠ.

修士論文

ĸƨĦ&U?Zx:

MEG II 実験陽電子タイミングカウンターのJPS Autumn Meeting 2017 (14aS36-7)

製作および較正と大強度ミュー粒子ビームによる性能評価
MEG II positron timing counter

Mitsutaka Nakao  Page:

9/39ÈÏÙ¯®óí½­¾òÇ»ßnPU\ÐI\Q'Æ¢Úæp

Pilot Run 2016»ßnJPS Autumn Meeting 2017 (14aS36-7)

ÖëMitsutaka Nakao  Page: 10/39

Å: à¬H>AKey Concept

φ&Ǌǐã:Þǁœé6#"Įǅ²ƚƍ:Ë6.
l OI\xǊǐã'ýÓ!9¢&dHSx%bWZ6 (MC).

512pixels
53 MeV e+Stopping
Target(helical trajectory)

0.12

Probability

l 1z

Mean: 9

0.1

0.08

0.06

0.04

0.02

μ+ beaml bWZĤN"&Įǅ²ƚƍ'~ 35 ps:Ƽđ6.

02

4681012141618

Number of hit pixels

20"ġÎ, 9bWZ%î!Įǅ²ƚƍ
Stochastic term

Nhit

Intrinsic resolution:
7080 psJPS Autumn Meeting 2017 (14aS36-7)

Nhit

Constant term

Multiple scattering:~4 ps at 9 hits

Mitsutaka Nakao  Page: 11/39

J3;W(1)l Ō¦(256¢)+Ō¦(256¢)=512¢&dHSx"ľđ76.
l ǙƷgvQVWHO{Vy~U(BC422, 40(50)x12x5 mm3)l

ż%SiPMs(AdvanSiD, ASD-NUV3S-P High-Gain):6.±(ÉƜ6144¢).

ěŬ, ũ´ěƇ"ƥl dHSxǅ&ĮǅƱńƂÿ: 30 psŌ

256dHSx

JPS Autumn Meeting 2017 (14aS36-7)

Ō

256dHSx
Mitsutaka Nakao  Page: 12/39

J3;W(2)l Ō¦(256¢)+Ō¦(256¢)=512¢&dHSx"ľđ76.
l ǙƷgvQVWHO{Vy~U(BC422, 40(50)x12x5 mm3)l

ż%SiPMs(AdvanSiD, ASD-NUV3S-P High-Gain):6.±(ÉƜ6144¢).

ěŬ, ũ´ěƇ"ƥl dHSxǅ&ĮǅƱńƂÿ: 30 ps

120 mm

6 SiPMs

…

40 mm

…

120 mm

6SiPMs

50 mm

ÅïĹ(ESR2)

y~N~Š&e<?`~JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 13/39

ä¶­¾
Waveform
Analysisl ŋĄ&Įǅ(t1, t2): L{QU{Zev
HOu{%3!Ɯſ.
OI\x&Įǅ
30% in Pilot
RunHitReconstruction●l bWZĮǅ(thit): 2Vs{^x&ýÓClustering

Positron
Reconstruction

thit =t1 + t 2
2

l bWZdHSx&ƉĎØ#ĮǅĎØ:!HvQU~: 6.
* HitsPositron Timing
by Timing Counter

JPS Autumn Meeting 2017 (14aS36-7)

cluster
Mitsutaka Nakao  Page: 14/39

»ßn ①Couple scintillators and arrays w/
optical cement

SiPMs on PCB& Scintillators

BC600l ÈŅǋ", SiPM, SiPM Array, O{Vy~U&¢µơǘ:Ɛ.
Wrap pixel withreflector

Pixel
Test

Hole
makingShielding

ESR2

Finish!!

Tedlar®

l 500 dHSx:Ɣ&ơǘè.
JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 15/39

»ßn ②
*Z:A\W

J3;W¢Úæp
90Srƈŕ:Š!­!&dHSx&Įl

MEG I TC(31Oct., 2006)

ǅ²ƚƍ:œé.

t1 +t22tRC"Įǅ:Ɯſ, RC&Įǅ²ƚƍ:ùā!dHSx&Įǅ²ƚƍ:ſ±.

MEG II TC(21Nov., 2016)

countsMass Test

50

4cm
5cm
L-shapeMix

4cm
Entries
Mean
RMS

405cm
249 Entries
72.1 Mean
3.06 RMS

M
30

205
80.69
5.126
LEntries
Mean
RMS

48
73.03
3.129

90

100

Entries
Mean
RMS

29
73.45
2.264

20

10050

60

7080

l dHSx&Įǅ²ƚƍ:70 ps

110
120
Resolution[ps]480 psJPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 16/39

ÈÏÙ¯®óí½­¾òÇ»ßnPU\ÐI\Q'Æ¢Úæp

Pilot Run 2016®óí½­¾òÇ

JPS Autumn Meeting 2017 (14aS36-7)

ÖëMitsutaka Nakao  Page: 17/39

®óí½ºál 512¢&dHSx'Įǅ&CeSWZ:0! 5, 30 ps&Ƃÿ"Įǅ:É96ĉƖ 6.
l dHSxǅ&ĮǅƱń&/%, oOAxƱńŊ#y~N~ƱńŊ#2&ŪƓŧ$ĨŊ:ǄŦ.
l E{nƈĽ±Ï#&ĮǅÉ9'ot~C{ƲïöÜ(μ→eγνν):Š!Ɛ.
oOAxƱńŊ

y~N~ƱńŊ

q?{&BG"6, oOAxöÜ(μ→eνν)&Ǌǐã:Š6.

Ê«ŕ 4dHSx%y~N~:řï6.

5

ÙĒä

$

Good!

ǃ

ĉƖ$Įǅ

Ů

Good!

Ƃÿ24 ps

Good! 11 ps

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 18/39

X\8\í½¾ ①: ºáLaserController

Sync. pulseLASERModeScramblerLong Fiber10m}}}

Lightswitchl×8ch

LightSplitter

LightSplitter
1×8×8chy~N~ŕ#!PICOSECOND LIGHT
PULSER PLP-10(ōĺkZ]HQų):Š6.

Waveform
Digitizer
photodiodeLight
Splitter
1×8

Fiber 2.5m×8ch

U~KWZ%ƳdHSx:ǉ
432dHSx%y~N~:¬76ƞƜ.

l À²$«ǂ:ű 6/Light Switch%3!³5ı , 1Ð%64dHSx Ʊń:Ɛ.
l y~N~ÊĶaxQ&Įǅ:×Ŗ%!È
dHSx&ĮǅCeSWZ:ň/6.

(ōĺkZ]HQųHP35)-Wavelength 405 nm-Wavelength FWHM < 10 nm-Pulse duration typ. (max) 60 (100) ps

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 19/39

X\8\í½¾ ②: K(*F\Scintillator

1.0 mm
1.9 mmFiber

The tip of the fiber(Ceramic,1.8 mm)

Fiber(0.9mm)

2.5 mm7 mm

Screw

1.5 mmJPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 20/39

P9,Wí½¾ ①: ºá

2=œéĮǅ

ƜſĮǅ

Tij(T0i +T OFij + Tj )NXevent Nhit ⇣Xij⌘2dHSx%ÒĴ&ĮǅCeSWZ:7 ŭ5l (CDCH:Š!)°ľđǗƮ 4TOF:Ɯſ.
l r{XDxz 4TOF&¤:Ɯſ6.
l ǗƮ%3!, ÈdHSx 3ŷǖ&TOF&¤:ė #é.
→pattern A, B and C (3patternx128pixels=384ŷǖ&TOF)
l χ2 :­bWZ, ­?i{Z%î6œéĮǅ#ƜſĮǅ&ù#!éƊ
6(Ā).
l χ2 :Ĳñ¿63$dHSx%ÒĴ&ĮǅCeSWZ: ΔTj :ň/6.
(Millepede II:Š)

Millepede II www.desy.de/~kleinwrt/MP2

A software provided by DESY to solve the linear
squares problems, such as detector alignment andcalibration based on track fits.
JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 21/39

P9,Wí½¾ ①: ºá2=œéĮǅƜſĮǅ

Tij(T0i +T OFij + Tj )NXevent Nhit ⇣Xij

⌘2dHSx%ÒĴ&ĮǅCeSWZ:7 ŭ5l (CDCH:Š!)°ľđǗƮ 4TOF:Ɯſ.
l r{XDxz 4TOF&¤:Ɯſ6.
l ǗƮ%3!, ÈdHSx 3ŷǖ&TOF&¤:ė #é.
→pattern A, B and C (3patternx128pixels=384ŷǖ&TOF)
l χ2 :­bWZ, ­?i{Z%î6œéĮǅ#ƜſĮǅ&ù#!éƊ
6(Ā).
l χ2 :Ĳñ¿63$dHSx%ÒĴ&ĮǅCeSWZ:ΔTj :ň/6.
(Millepede II:Š)

Millepede II www.desy.de/~kleinwrt/MP2

A software provided by DESY to solve the linear
squares problems, such as detector alignment andcalibration based on track fits.
JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 22/39

P9,Wí½¾ ①: SZ?/WY;>A)>M
llll

ĮǅCeSWZ:N(0 ns, (5 ns)2)"şđ(ńƚ).
oOAxƱńŊ:Š!ĮǅCeSWZ:Ɯſ.
ƜſƆļ&ńƚ 4&7:gzWZ.
TOF&¤#!2aU~{Ƌ .
Ǒ: 384ŷǖ, ƫ: ?i{Zņ%Monte Carlo truth(ŝďŧ$ÙÉ)[ps]Monte Carlol Based on Geant4.
l Generate μ+ beams, which stop attarget.
l e+ from normal muon decay hits theTC.
l Detector: 1/4TC and No CDCH.
→ the same as Pilot Run 2016

Calculated time-offset – true time-offset

phi dependenceσ: 10.8ps
σ: 1.8ps

100 psZ dependence

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 23/39

P9,Wí½¾ ②: SZ?/WY;>A)>M
llll

ĮǅCeSWZ:N(0 ns, (5 ns)2)"şđ(ńƚ).
oOAxƱńŊ:Š!ĮǅCeSWZ:Ɯſ.
ƜſƆļ&ńƚ 4&7:gzWZ.
TOF&¤#!2aU~{Ƌ .
Ǒ: 384ŷǖ, ƫ: ?i{Zņ%Monte Carlo truth(ŝďŧ$ÙÉ)[ps]

Calculated time-offset – true time-offset

σ: 10.8ps

phi dependence

σ: 1.8ps
100 psZ dependence
Ö·l ­&(4l z/φ`?=Q(ŀŖ¥ù)', 10.8 ps
Ɨ47. →TOF&ƗŹ05%ä(ƫ"'Ŏ).

→CDCH&ZvWF{I:Š6ĲƄŧ$oOAxƱńŊ"'`?=Q'ñ$6#Ƌ
476(Physics Run+Ë!&ƦǕ).

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 24/39

ÈÏÙ¯®óí½­¾òÇ»ßnßĂÿot~Ɓãc~p:ŠċƍƠ

Pilot Run 2016

JPS Autumn Meeting 2017 (14aS36-7)

PU\ÐI\Q'Æ¢Úæp

Pilot Run 2016
Öë

Mitsutaka Nakao  Page: 25/39

Pilot Run 2016
l ¼ TC %6128 dHSx :?{QZ~x.
l c~pU?p: 3ƹǅ
l MEG II ÊĂÿ&μ+c~p(Stopping Rate: 7.0x107Hz).
Number of Proton

Integrated Proton× 1021
12Accelerator Delivered10

Used for Plot Run 2016

864

Shutdown due toaccelerator problem

2012/06

19/06

3 weeks

26/06

time(date/month)

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 26/39

DAQ & Trigger
MEG IIF+Zu{k & DAQ[2npszfD,.
AV0\l Pilot Run 2016"'
wE~:ơ.

&Z

Ø Track-likeØ Multiplicity
Ø OR
Ø LaserØ Pedestal

DAQ: WaveDREAM2l PSI"ǄŦ7ÞŁƍ&DAQl~[. &Łƍ:ė .
Ø SiPM biasing (~ 240 V)
Ø Amplifier (no pre amplifier)Ø Pole-zero cancellation
Ø Waveform digitization at gigasampling (DRS*4 chip)Ø First level trigger*DRS = Domino Ring Sampler

WaveDAQ crate (= 16 WaveDREAM2 boards = 256 channels)

Trigger Concentrator Board
JPS Autumn Meeting 2017 (14aS36-7)

WaveDREAM2 board = 16 channels

Mitsutaka Nakao  Page: 27/39

X\8\í½9:?Q;>A)>M
l y~N~ƱńOQXp:128dHSx,40dHSx%?{QZ~x. (êǌ%y~N~Y~U:ÆĈ&'37dHSx)

Laser
40 pixels(5 splitters)
Event Display

JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 28/39

2®óí½­¾'ðÆ①Êè(Ūîŧ$)ĮǅCeSWZ&① Pilot Run% 6(Įǅŧ$)çéċ.
② ÙĒ#&(4.

→ƱńĨŊ&0&&çéċ.
→­&Įǅ²ƚƍ%ąǔ6.

y~N~ƱńŊ#oOAxƱńŊ&ù:Ƌ
(Įǅ&×Ŗ'ID=0&dHSx)

JPS Autumn Meeting 2017 (14aS36-7)

6.

Mitsutaka Nakao  Page: 29/39

2®óí½­¾'ðÆ②2 &ƱńĨŊ%36ĮǅCeSWZ&ù&bQZw~'/&Įǅ"&¤:Æ5±

('/&dHSx:×Ŗ%Ūî¤)Splitter250

ch2_ID:1
ch4_ID:3

ch5_ID:4

ch6_ID:5

ch7_ID:6

ch8_ID:7

100

150

200

250

300

350

50

ch2_ID:9
ch4_ID:11

ch5_ID:12

ch6_ID:13

ch7_ID:14

ch8_ID:15

100

150

50

ch1_ID:16

ch2_ID:17

ch3_ID:18
ch5_ID:20

ch4_ID:19
ch6_ID:21

ch7_ID:22

ch8_ID:23

100

150

200

250

300

350

200
150

200

250

300

350

400[hours]
450

Splitter4

10050[ps][ps]Splitter3Toffset(MC-LC)
ch1_ID:8
ch3_ID:10[ps]

ch1_ID:0
ch3_ID:2050[hours]ch1_ID:24

ch2_ID:25

ch3_ID:26
ch5_ID:28

ch4_ID:27
ch6_ID:29

ch7_ID:30

ch8_ID:31

100

150

− 50
− 100

200

250

300

350

400[hours]
450

MC-LC_History(relative timeoffset)

Splitter5

− 150
− 200
0[ps]

80
60
40200−20−40−60
−80
−1000

100
8060
40200−20−40−60−80−100
400[hours]450080
6040200−20−40−60−80
400 −1004500[ps]

Splitter1[ps]

100
80
60
40
200−20−40−60−80
−1000
80
60
40
200−20−40−60−80−100
1000

other chs have the same level of errorbar as ch2
ch1_ID:32
ch3_ID:34
ch5_ID:36
ch7_ID:38

50

100

σ= 39 ps
51015

20

25

30

35
40
Laser Counter ID

ch2_ID:33
ch4_ID:35
ch6_ID:37
ch8_ID:39

150

200

250

300

350

400
450
[hours]① ĮǅCeSWZ&Ūî¤&ĮǅÝ½', 6 ps"çé!ĥ
Éċ

Æ7!6.

② 2 &ƱńŊ&ù&(4→QgwWU~4, 5 ßØ', 39 ps(4!6.

y~N~: ŒÿÝ¿ß?/QgwWU~5&.e<?`~Òé→Physics Run+Ë!ġÎé.

JPS Autumn Meeting 2017 (14aS36-7)

l Ǉ&ƚĻ"', oOAxƱńŊ&ĩÕ.
Ɔļ:39 ps&Ƃÿ#!Š6.
Mitsutaka Nakao  Page: 30/39

®ózäÚæp ①: Even-Odd ä¶: 6bWZl ƕĤdHSx"&Įǅ²ƚƍ:, “Even-Odd”ƚ
Ļ"Ơ6.
l (áĤŤŨdHSx&ýÓ-§ĤŤŨdHSx&ýÓ)/2:Ɯſ6#", ƕĤbWZ%36²
ƚƍ:Ơ6.
l bWZĤ=2, 4, 6, 8, 10%

!Ɯſ.

T6hits =10dHSx&ƅ:6

JPS Autumn Meeting 2017 (14aS36-7)

Ɖ

T1 +T3 +T5
3

T2 +T4 +T63/2

ť$622ƅ:ƾ*Mitsutaka Nakao  Page: 31/39

®ózäÚæp ②: Ö·Total time resolution vs. number of hits80

χ2 / ndf

8.537 / 3single

92.62 ± 0.6224

const

0 ± 3.032

l ƫƈ'iQZe>WZ:Ƒ:60

40

l σtotal(9) = 31 ps :Ƽđ.

20

l OI\x&bWZĤ"ǁ.Įǅ²ƚƍ', 38 ps".

2

4

6N hit80.12

Probability

Resolution (ps)100l ÈŘ'22ƅ&ƅ.É9&ǁ.
ýÓ:ÆĮǅ²ƚƍ.

10

Mean: 90.1

0.08

Ø 7'MEG I&TC%Ň,!²ƚƍ:2£ġÎ#%Ūă.

0.06

0.04

0.02

024

6

81012

141618

Number of hit pixels

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Pilot Run 2016

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JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 35/39

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JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 38/39

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JPS Autumn Meeting 2017 (14aS36-7)

Mitsutaka Nakao  Page: 39/39