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Energy
TeV
Fundamental
CP phases
QCD
gluon
self-couplings
Muon EDM
nuclear
eN couplings
Neutron
EDM ( )
EDMs of nuclei
and ions
(deuteron, etc)
atomic
EDMs of paramagnetic
molecules
(YbF, PbO, HfF + )
Atoms in traps (Tl,Rb,Cs)
EDMs of diamagnetic
atoms (Hg,Xe,Ra,Rn)
Pospelov Ritz, Ann Phys 318 (05) 119

!
"
s,b
s,b
W + d ~ ! 0
~
d
d
d
u
c,t
W-
c,t
d
d
u
d
d
u
d
d
u

!
"
s,b
s,b
~
d
W + d ~ ! 0
d
d
u
c,t
W-
c,t
d
d
u
d
d
u
d
d
u
(Baker et al., PRL97 (2006) 131801)

(Baker et al., PRL97 (2006) 131801)

d n = (+0.2 ± 1.5(stat) ± 0.7(syst)) × 10 −26 e · cm
ω ±
2π
=3× 101
B
1µT ± 5 × 10−8 d n
10 −26 e · cm
E
10kV/cm

"#$$%&'(&)*+ %,-%$./%&'(0'(122(11
+#D/%'07(?D=9.%7B=
Mu-metal
34(.&
? @
A.%7B(5

Effect Shift at ILL at PSI at J-P ARC
(storage volume 1000 cm 3 )
a Door cavity dip ole -5.6 2.0 0.10 0.036
b Other dip ole fields 0.0 6.0 0.40 0.144
c Quadrupole difference -1.3 2.0 0.60 0.216
d Uncomp ensated B drift 0.0 2.4 0.90 0.324
e Leakage curren ts 0.0 0.1 0.10 0.036
f v E (translational) 0.0 0.03 0.03 0.03
g v E (rotational) 0.0 1.00 0.10 0.10
h Second-order v E 0.0 0.02 0.02 0.02
i Hg light shift (geo phase) 3.5 0.8 0.40 0.20
j Hg light shift (direct) 0.0 0.2 0.20 0.072
k Hg atom EDM -0.4 0.3 0.06 0.06
l Electric forces 0.0 0.4 0.40 0.14
m ac fields 0.0 0.01 0.01 0.01
Total -3.8 7.2 1.31 0.67
Table 1: Summary of systematic errors (10 -27
e·cm).

µ
n
n
n
n

≤

≤

2m 3
vacuum
UCN
storage
30 liters, 5K
solid D 2
p-beam
1.3 MW
1% duty cycle
3.6 m 2
D 2 O

2m 3
vacuum
UCN
storage
30 liters, 5K
solid D 2
p-beam
1.3 MW
1% duty cycle
3.6 m 2
D 2 O

2m 3
vacuum
UCN
storage
30 liters, 5K
solid D 2
p-beam
1.3 MW
1% duty cycle
3.6 m 2
D 2 O

Table 4.2: Estimation of required size of the radiation shield.
beam power of 20 kW.
Under these assumptions, the minimum radiation shield is 117m 3 (916 tons) of iron
and 147m 3 (324 tons) of concrete as shown in Fig. 4.10. The rectangular hexahedron
tangential to the minimum column is 150m 3 (1150 ton) of iron and 169m 3 (373 ton) of
concrete.
Figure 4.10: Configuration and outer dimension of the 20 kW UCN source with the
neutron production target, moderator, reflector, converter and radiation shield with the
surface dose rate of 1µSv/h. In this example, the radiation shield on the left rear is

Specification of J-PARC Linac
Proton Energy 400MeV(at 2013?)
Pulse width
Repetition
Peak Proton Current
Average Current
Peak Power
Average Power
0.5 ms
25 Hz
50 mA
0.625 mA
20 MW
250 kW
Moderation
~1.4ms

Production Rate
• Cold Neutron Flux
Φ boltzmann = 6.2 x 10^11 n/cm2/pulse
• Production Rate1.0x10 -8 Φ boltzmann
– ρ UCN = 6200 UCN/cm 3 /pulse (Boltzmann)
Heat load
• Heat load on D 2 cell is 3W/pulse.
It correspond to 152mK/pulse
20MWDC1300K

not different from continuous UCNs ...
Peak proton power = 20MW
Average proton power = 250kW

e-shaping to sharp pulse
take in pulsed UCN
while door is open
the door closes,
UCNs broaden
in the bottle
take in next pulsed UCN.
some UCNs overflow,
the others stay.
the door closes,
the density increases
by the pulse

Rebuncher reshapes UCNs into sharp pulse.
x
door position
Rebuncher
fast UCN
slow UCN
UCN production
at converter
Rebuncer decelerates the UCNs according to the velocity,
t

Rebuncher reshapes UCNs into sharp pulse.
x
door position
Rebuncher
fast UCN
slow UCN
UCN production
at converter
Rebuncer decelerates the UCNs according to the velocity,
t

0
-100
1000 1200 1400
C:\LANL\NEDM\FILPA0A.AF 6-10-2010 0:23:28
100
100
0
C:\LANL\NEDM\FILPA33A.AF 6-10-2010 0:55:30
1200 1400
1000
-100
1000 1200 1400
0
C:\LANL\NEDM\FILPA33A.AF 6-10-2010 0:55:30
100
C:\LANL\NEDM\FILPA0A.AF 6-10-2010 0:23:28
1000 1200 1400
-100
0
100

K 2 = ω Larmor
ω B
=
γ n B 2 1
v n (∂B/∂z) ≥ 6.5 (v n ≤ 7.2m/s)

K 2 = ω Larmor
ω B
=
γ n B 2 1
v n (∂B/∂z) ≥ 6.5 (v n ≤ 7.2m/s)

K 2 = ω Larmor
ω B
=
γ n B 2 1
v n (∂B/∂z) ≥ 6.5 (v n ≤ 7.2m/s)

K 2 = ω Larmor
ω B
=
γ n B 2 1
v n (∂B/∂z) ≥ 6.5 (v n ≤ 7.2m/s)

1100
High voltage lead
Mercury
polarizing cell
14 CHAPTER 3. MEASUREMENT OF NEUTRON EDM
Magnetic field coil
Electrodes
UCN shutter
Storage cell
Vacuum chamber
160
120
270
1200
1900
UCN shutter
Rotary UCN shutter
Multi layer
magnetic sheild
UCN detectors
1 m
Figure 3.3: EDM measurement system.

R&D setup @ RIKEN
!"#$%&'("$&)*+,-"./
!"#$%&'(#)*++
08(7(&%"(%#
$"4#,1&=($,1"2#1
0($,1"2,3(4&&
5(%6$,7(1
:,.#1&.;.7#<
5,94#3'&.8"#$%&
,.!"
,-!"
,.!"
/-#012

R&D setup @ RIKEN
!"#$%&'("$&)*+,-"./
!"#$%&'(#)*++
08(7(&%"(%#
$"4#,1&=($,1"2#1
0($,1"2,3(4&&
5(%6$,7(1
5,94#3'&.8"#$%&
:,.#1&.;.7#<
,-!"
,.!"
,.!"
/-#012

phase.
Figure 1.1: Statistical and systematic errors extrapolated from the result of the ILL
experiment [11] as a function of the radius of the cylindrical storage cell . The reflectivity
of the inner surface is assumed to be optimized for the precession time of 130 s.

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2012 2013 2014 2015 2016 2017
2018
10 -20 10 -20
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Mirror
Lab
Neutron

Mirror
Lab
Neutron

Mirror
Lab
Neutron

Mirror
Lab
Neutron

Mirror
Lab
Neutron

Mirror
Lab
Neutron

Mirror
Ni mirror on Si(0.3mm)

Mirror
Ni mirror on Si(0.3mm)

Mirror
Ni mirror on Si(0.3mm)