j-parc koto実験
TRANSCRIPT
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506
5
layer
10kHz 1kHz
1 1
0.1 SiTCP
2,3
2013 11
6
2013 2020
SciCRT 3
SciCRT
6
SciBar
SciBar SciBooNE Fermi
FNAL
INAOE
SciCRT
[1] K.Nitta, et al., Nucl. Instr. and Meth. in Phys.
Res. A, 2004, 535: 147-151.
[2] , 2004,
[3] , 2002,
[4] K.Niita, et al., JAEA-Data/Code 2010-022
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Conf., Beijing 2011.
[6] S.Shibata, J.Geophysical R., 1994, 99: 6651-
6665.
500
J-PARC KOTO
[email protected] [email protected]
[email protected] [email protected]
2013 ( 25) 8 19
1 J-PARC E14 KOTO1 K
KL 01) CPKL CP+CP2) 3 10113) 1 Z0 2%CPKEK E391a
t
W
Z0
s
d
1: K
1K0 at TOkai
2.6 108 (90% CL) [1]BNL 787/949KK+ + 7 [2]KL 0 1.5 109 Grossman-Nir Limit[3]SUSY[4]lit-
tlest Higgs[5, 6]4 [7, 8]Grossman-Nir LimitKOTOKL 0 20062009 9
(Stage 2)2013
2 2.1 KL 00
2KOTO
83
-
501
2: KOTOKL (CsI calorimeter) 1.9 m veto (MB)5.5 m (Membrane)BHPV(Beam Hole Photon Veto)
vetoKOTO J-PARC
MR 30 GeV 26 2KOTO KL 16 2 ( 4.5 m 5 m) sweeping 21 m 10 cm [9] 2 KOTO
(CsI calorimeter)FBMB vetoKOTO KEK E391a3 CV vetoCC Collar Counter
2 (T1)
3MB
BH(Beam Hole)105 Pa0.1 PaKEK E391aKEK E391a KOTO
() ()
2.2 4KOTO
(4
84
-
501
2: KOTOKL (CsI calorimeter) 1.9 m veto (MB)5.5 m (Membrane)BHPV(Beam Hole Photon Veto)
vetoKOTO J-PARC
MR 30 GeV 26 2KOTO KL 16 2 ( 4.5 m 5 m) sweeping 21 m 10 cm [9] 2 KOTO
(CsI calorimeter)FBMB vetoKOTO KEK E391a3 CV vetoCC Collar Counter
2 (T1)
3MB
BH(Beam Hole)105 Pa0.1 PaKEK E391aKEK E391a KOTO
() ()
2.2 4KOTO
(4
502
) KL 0.11 GeVveto 1 MeVKOTO undoped CsI
KTeV25 mm50 mm 2 500 mm27X0KEK E391a70 mm 300 mm16X0 (PMT)KTeVCockcroft-Walton1 MeV2008CsI
KTeV2700 PMT 1 1 9Cs 144 12 12 100800 MeV
EE
(%) =1.3E 0.1
E 0.8 (0) (1)
t(ns) =0.12E 0.10 (2)
EGeV2010 5 J-PARC
-CsICsI 200 m 27165( 3)2011 2 34 mm3
52010 6 9
3: CsI 1.2 m25 mm 50 mm
CFRP2012 2 1 KL 30 4KL 30 6 6
4: KL 30
85
-
503
5: KL 30
5KL 498 MeV/c21%KL6 61
E/p0 0.5 1 1.5
# of
eve
nts
0
20
40
310Before calibration
After calibration
6: KL 30
KL 30 KL 30
62012KOTO
2.3 CV
(Charged Veto) CV (+p 0+n
) 0CV 100 keV100 keV 10 photo-electron(p.e.)KEK E391a CV
0KOTO CV 7 CV 25cm
2 8
7: () CV()
16 0.8 mm (CFRP) 3 mm (BC408) ( 0.4 g/cm2) 8 6070 mm 10 mm 1 mm (Y11(350)) 4
86
-
503
5: KL 30
5KL 498 MeV/c21%KL6 61
E/p0 0.5 1 1.5
# of
eve
nts
0
20
40
310Before calibration
After calibration
6: KL 30
KL 30 KL 30
62012KOTO
2.3 CV
(Charged Veto) CV (+p 0+n
) 0CV 100 keV100 keV 10 photo-electron(p.e.)KEK E391a CV
0KOTO CV 7 CV 25cm
2 8
7: () CV()
16 0.8 mm (CFRP) 3 mm (BC408) ( 0.4 g/cm2) 8 6070 mm 10 mm 1 mm (Y11(350)) 4
504
8: CV CFRP 1
7 7 3 mm MPPC(Multi-PixelPhoton Counter) PMT 3MPPCMPPC10C 1 p.e. 200 kHzMPPC8 10550 1 p.e.CV 2012 62.2
9850 mm100 keV 1323 p.e. 19 p.e.(3 mmMIP 90 p.e.)
X (mm)-1000 -500 0 500 1000
Y (m
m)
-1000
-500
0
500
1000
8
10
12
14
16
18
20
22
24
26
9: 100 keV (p.e.)
2.4 NCC (Neutron Collar
Counter) KLKL2NCC vetoNCC
0-KEK E391aKOTO (38 cm) (1.9 cm) undoped CsI0 0 1 MeVNCC
KLNCCCsI () 10NCC48 6.6 cm 6.8 cm
87
-
505
10: NCC () ()
8 5 45 cmCsIPMT7NCC6.6 cm 3 1 mm 45 cm ( 11) 1 mm 40 283 ( veto) 124 3()
11: NCC
1 MeV 12CsI (PMP 5000ppm) PMT 484.5 p.e./MeV 30%10 MeV
7KEK E391aKTeV
12: NCC (PMP5000)CsIPMT
0.45 p.e./MeV 1%2012 12 J-PARC
13 (
13: 5 MeV0100 MeV (100 MeV)
KL )
88
-
505
10: NCC () ()
8 5 45 cmCsIPMT7NCC6.6 cm 3 1 mm 45 cm ( 11) 1 mm 40 283 ( veto) 124 3()
11: NCC
1 MeV 12CsI (PMP 5000ppm) PMT 484.5 p.e./MeV 30%10 MeV
7KEK E391aKTeV
12: NCC (PMP5000)CsIPMT
0.45 p.e./MeV 1%2012 12 J-PARC
13 (
13: 5 MeV0100 MeV (100 MeV)
KL )
506
2.5 KOTO 14 KOTO
KOTOADC [10, 11]
ADC
Lv1 trigger system
Detector
Opticallink
1Gbps Ethernet link
Lv1 trigger
Signal Lv2 Triggersystem
Level 1 Trigger
Level 2Trigger
Level 3Trigger
Data Data Data
Hit/ Energy
Waveform Digitization
14: KOTO
Category 6 EthernetADC Lv13 3
2.5.1 ADC
KOTO 14 bit 125 MHz12 bit 500 MHz2 ADCKOTO[12, 13] 125 MHz ADC (BHCVBHPV) 500 MHz ADC125 MHz ADCCsI ( 15)
15: CsIPMT () 10 ADC ()
8 ns (=125 MHz 1)ADCLv2 64 (512 ns)
2.5.2
3 ADCLv1ADC
8 nsADC ()CVMBNCC (veto) Lv1KLCVMBNCC veto 2013 5Lv1 28k events/spill ( 14 kHz)8Lv2ADC
1
86 2 1 spill
89
-
507
ADC Lv2missingKL 0 KL 30Lv2Lv2 1 Gbps Ethernet Lv3 PC2013 5 Lv2 8k events/spill ( 4 kHz)Lv3 PC Lv2
1Lv31 3 11 130 KB 1 600 GB1 ( 1
1)KEK(KEKCC) 2.7 Gbps
3 16KOTO
KOTO 2010 52012 3 () CV()2012 KOTO
(MB,FB)NCCKOTO3KOTO2012
201010-11
CV()() ()
20122
(kW)
20126
20121220131
201332013420135
1 3
6 10
15 20
24
16:
12 ( 17)10 mm1 2012 12
17:
2013 1 21
90
-
507
ADC Lv2missingKL 0 KL 30Lv2Lv2 1 Gbps Ethernet Lv3 PC2013 5 Lv2 8k events/spill ( 4 kHz)Lv3 PC Lv2
1Lv31 3 11 130 KB 1 600 GB1 ( 1
1)KEK(KEKCC) 2.7 Gbps
3 16KOTO
KOTO 2010 52012 3 () CV()2012 KOTO
(MB,FB)NCCKOTO3KOTO2012
201010-11
CV()() ()
20122
(kW)
20126
20121220131
201332013420135
1 3
6 10
15 20
24
16:
12 ( 17)10 mm1 2012 12
17:
2013 1 21
508
KOTO 2013 3 3 KEK E391a9435
5Grossman-Nir limit5 17 20 kW5 18
23.8 kW veto23.8 kW KL (KL) KEK E391a 12 10 1J-PARC 5 231018 POT(Protons On Target )800 1016 POT 1601016 POT
9MR
10 http://j-parc.jp/HDAccident/HDAccident-j.html
18: POT
5 1
4 1 51 KL 30KL 00,
KL 2 KL 1 3 19KL 306 KL
]2mass [MeV/c400 500 600
2#
of e
vent
s/ 2
MeV
/c
10
510 Data000LK
p [MeV/c]0 5000 10000
# of
eve
nts/
100
MeV
10
510Data
000LK
19: KL 30 6 ()KL ()
91
-
509
3KL%5
Grossman-Nir limitKEK E391aKOTO 2KEK E391aKL 0 veto
5 KOTO
2013 5 KEK E391a112014Grossman-Nir Limit50 kW100 kWKOTOKL 0 O(1011)
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11MB Inner MB
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