1. UCN at TRIUMF
09:00-09:15 - Welcome
09:15-10:15 - UCN source overview, data, plans and progress on modifications. (Masuda et al)
1 Present UCN source at RCNP
1-1 Proton beamline, spallation target, neutron moderator, reflector and vertical He-II
1-2 UCN storage with valves
2 Next UCN source
2-1 Target moderator reflector geometry
2-2 Horizontal He-II
10:30-12:00 - UCN source implementation at TRIUMF and issues (short reports)
- recap of discussion from yesterday afternoon (Martin)
- experimental area design (UCN experimenters)
- cryogenics design (Sekachev et al)
- schedule (Verma et al)
- costs (Martin)
13:30-14:10 - overview of experiments and data acquired (Matsuta et al)
14:10-14:30 - Xe comagnetometry (Masuda?)
3 EDM measurement
3-1 UCN polarization
3-2 Ramsey resonance
3-3 Buffer gas for GPE and Xe-comagnetometer
14:30-15:00 - prototyping for Xe? e.g. measurements of E-breakdown?
15:00-15:15 - prototyping for magnetic shielding? (both mu-metal and SC?)
15:30-16:00 - discussion of experimental LOI's/proposals (Martin)
16:00-16:30 - other experiments (discussion) (Martin)

2. Superthermal UCN source
Increase n phase space density by phonon scattering
ILL, KEK-RCNP/TRIUMF, LANL, PSI, Munich, SNS, NCSU, PNPI, Indiana
UCN bottle
UCN He-II or SD2
EUCN phonon
form factor
Ein S(Q,ω)
cold n Φn

3. Superthermal UCN source
Increase n phase space density by phonon scattering
ILL, KEK-RCNP/TRIUMF, LANL, PSI, Munich, SNS, NCSU, PNPI, Indiana
UCN bottle
UCN He-II or SD2 Production rate PUCN =
EUCN phonon ∫∫σ(Ein→EUCN)Φn(Ein)NdEindEUCN
form factor d2σ/dQdω =
Ein S(Q,ω)
kf/ki σcoh/4π S(Q,ω)
cold n Φn

4. Superthermal UCN source
Increase n phase space density by phonon scattering
ILL, KEK-RCNP/TRIUMF, LANL, PSI, Munich, SNS, NCSU, PNPI, Indiana
UCN bottle
ρUCN = PUCN×τs×εext×εd
UCN He-II or SD2 Production rate PUCN =
EUCN phonon ∫∫σ(Ein→EUCN)Φn(Ein)NdEindEUCN
form factor d2σ/dQdω =
Ein S(Q,ω)
kf/ki σcoh/4π S(Q,ω)
cold n Φn

5. Our UCN production

6. 17.8 n/p
Neutron
6.7 n/p production
4.4 n/p
RCNP Nucleus
1.3 n/p
n/p
TRIUMF
produced by n
spallation
0.07 n/p
MeV
MeV
MeV
GeV
200
1
400
500
p
beam Target
50 MeV
nucleus
K. Tesch
Proton energy, Ep (MeV) (1985)

7. He-II
World’s new UCN sources
n guide
solid angle
10-3~10-4
Cold
n He-II SD2
source

8. He-II
World’s new UCN sources
n guide
solid angle
10-3~10-4
Cold
n He-II SD2
source
ρUCN = PUCN×τs×εext×εd

9. He-II
World’s new UCN sources
n guide
solid angle
10-3~10-4
Cold
n He-II SD2
source
ρUCN = PUCN×τs×εext×εd
He-II Ours SD2 Los Alamos SD2 PSI
PUCN (UCN/cm3/s) 2×103/20kW D2 4.4×104/76kW 2.9×105/1.2MW
τs (s) 150 24×10-3 → 1.6 24×10-3 → 6
εd 12L → 30L 0.24L → 9.6L 27L → 2000L*
εext 1 0.03* 0.1
Phys.Lett A301(2002)462 Phys.Lett B593(2004)55 Phys.Rev C71(2005)054601
PhysRevLett 89(2002)

10. UCN source improvement at RCNP
ρUCN = production rate P × storage time τs,
P∝ Φn , Φn ∝ Ep×Ip
He-II film 3He, H
Date Ip τs THe-II perimeter contamination
2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He
June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He
November 1 μA 34 s 0.8 K 5 cm Normal 4He
2006
July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He
Pure 4He
April 2008 1 μA 47 s 0.8 K 5 cm fomblin
December Pure 4He
1 μA 61 s 0.8 K 5 cm
2009 alkali

11. UCN source improvement at RCNP
ρUCN = production rate P × storage time τs,
P∝ Φn , Φn ∝ Ep×Ip
He-II film 3He, H
Date Ip τs THe-II perimeter contamination
3He cryostat
2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He
June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He
November 1 μA 34 s 0.8 K 5 cm Normal 4He
2006
July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He
Pure 4He
April 2008 1 μA 47 s 0.8 K 5 cm fomblin
December Pure 4He
1 μA 61 s 0.8 K 5 cm
2009 alkali

12. UCN source improvement at RCNP
ρUCN = production rate P × storage time τs,
P∝ Φn , Φn ∝ Ep×Ip
He-II film 3He, H
Date Ip τs THe-II perimeter contamination
2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He
Suppress
June 2006 1He-II film flow
μA 29 s 0.9 K 8.5 cm Normal 4He
November 1 μA 34 s 0.8 K 5 cm Normal 4He
2006
July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He
Pure 4He
April 2008 1 μA 47 s 0.8 K 5 cm fomblin
December Pure 4He
1 μA 61 s 0.8 K 5 cm
2009 alkali

13. UCN source improvement at RCNP
ρUCN = production rate P × storage time τs,
P∝ Φn , Φn ∝ Ep×Ip
He-II film 3He, H
Date Ip τs THe-II perimeter contamination
2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He
June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He
Remove 3He
November 1 μA 34 s 0.8 K 5 cm Normal 4He
2006
July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He
Pure 4He
April 2008 1 μA 47 s 0.8 K 5 cm fomblin
December Pure 4He
1 μA 61 s 0.8 K 5 cm
2009 alkali

14. UCN source improvement at RCNP
ρUCN = production rate P × storage time τs,
P∝ Φn , Φn ∝ Ep×Ip
He-II film 3He, H
Date Ip τs THe-II perimeter contamination
2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He
June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He
November 1 μA 34 s 0.8 K 5 cm Normal 4He
2006
July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He
Remove
Hydrogen Pure 4He
April 2008 1 μA 47 s 0.8 K 5 cm fomblin
December Pure 4He
1 μA 61 s 0.8 K 5 cm
2009 alkali

15. UCN source improvement at RCNP
ρUCN = production rate P × storage time τs,
P∝ Φn , Φn ∝ Ep×Ip
He-II film 3He, H
Date Ip τs THe-II perimeter contamination
2002 200 nA 14 s 1.2 K 8.5 cm Normal 4He
June 2006 1 μA 29 s 0.9 K 8.5 cm Normal 4He
November 1 μA 34 s 0.8 K 5 cm Normal 4He
2006
July 2007 1 μA 39 s 0.8 K 5 cm Pure 4He
Remove
Hydrogen Pure 4He
April 2008 1 μA 47 s 0.8 K 5 cm fomblin
December Pure 4He
1 μA 61 s 0.8 K 5 cm
2009 alkali

16. EDM
cell UCN
UCN valve
We are constructing
a new He-II UCN source
1.2 m
Present
vertical
source of 20 kW
lead target
Temperature
4. No gravitational
barrier
UCN
Window phonon 3 mK
EDM He-II
cell UCN
Cold
20~80 K
UCN valve
3. Smaller UCN loss
d Thermal
2. Short distance 300 K
1. Neutron production
×50 lead target n production
several 1010 K

17. Conceptual design of the new UCN source
1. Neutron production ×50 2. Short distance distance between He-II and target
3. Smaller UCN loss 4. No gravitational barrier
EDM He-II cryostat
Permalloy
2 mG
Ho
Spherical coil
Silica cell 100 mG Actuator GM cryostat
pumping
VF = 90 neV
H1
UCN source
585 110 80 80
200
3He
Door
valve
GM cryostat
70
Liq.He
Silica guide Spin flipper
605 1K
pot
Level meter
114 40
Fe foil evacuation
72.4
5L
pot 20K D22O
20K D O
85
72
Rotary
.4
He-II
89
valve
89 UCN VF = 210 neV
300
valve
UCN He- He
3 4
heat 300K D2O
valve exchanger
UCN detector
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20. Construction of He-II cryostat
will be in FY2010
Super leak for isotopically pure 4He production
He-II cooling by means of 3He pumping
UCN valve in He-II
By evaporated 4He gas
pre-cooling circulating 3He gas
pre-cooling pure 4He gas
cooling 77K radiation shield

21. Present Cu-fin heat exchanger
for He-II cooling
3He side
4He side
Heat exchange area will be increased for
TRIUMF

22. Present UCN valve on
He-II
closed opened

23. 3He gas -4He gas
Liq. He heat exchanger
for the present source
3He gas
3He gas flow
4He gas

24. Liquid He consumption

25. Present status
Production Density Density
Power rate source experiment
5 UCN/cm3/s 250 UCN/cm3 19 UCN/cm3
Ours 390 W 8L He-II 8L He-II
Ec = 90 neV
210 neV 210 neV
4.4×104 UCN/cm3/s 145 UCN/cm3 35 UCN/cm3
Los Alamos 76 kW 0.24L SD2
3.6L, 200 neV Ec = 180 neV
335 neV
1 UCN/cm3/s
Sussex-RAL 60 MW 1.3L He-II ** **
250 neV
Munich 100 kW ** 8 UCN/cm3 **
TRIGA reactor 10L, 250 neV
Previous ILL 60 MW ** 50 UCN/cm3 2~3 UCN/cm3
335 neV Ec = 100 neV
Serebrov (PNPI) also proposed a He-II UCN source in 2008