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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Kyoto Neutron Source Activity – Satellite Pulsed Tiny Neutron Source –
Y.Iwashita, M.Ichikawa, M.Yamada, H.Tongu, T.Nagae, T.Tanimori, H.Fujioka, K.Imai
- Kyoto University
H.M.Shimizu - KEK
Kyoto Area Neutron Source Activity – Satellite Pulsed Tiny Neutron Source –
1
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Background (skipped)• Why Satellite?
• Big Facility Irony
• Flexibility, Usability, Availability, Freedom, etc.
• Education, Incubation of Ideas
• Excavation of needs, potential users
• .....
SPULTNSSatellite Pulsed Tiny Neutron Source
2
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Photon Case
http://www.atomin.go.jp/atomin/high_sch/reference/radiation/radiation_light/index_05.html
Phot
on B
rillia
nce
Sun ROTARY ANODE TYPE X RAY TUBE
Medical X RAY TUBE
Spring-8 SR from BM
Spring-8 SR from Wiggler
Spring-8 SR from Soft X-ray Undulator
Spring-8 SR from Undulator
1010
:Solar Mass ~105.5 Earth
Big Facility
Tiny Source
/Pallas~1010
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Network beyond Satellite?
Collaborations ∝ N2!!
Makes all neutronians happy!4
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Hokkaido45MeV EL
Kumatori
J-PARCJRR3
Kyoto
Activity at Kyoto
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing6
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing7
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Uji Campus
8
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Institute for Chemical ResearchAccelerator Laboratory
100MeV e-Linac300MeV e-SRing
7MeV p-LinacIon Ring
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
ICR 7MeV Proton LinacRFQ-2MeVDTL-7MeV
<180pps, 50µsduty <~1%
1992.8
2MeV±1%
input RF
10
L5773 x 2(L3403)
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing11
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Tandem Building
Main Campus at Sakyo
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
8MV Tandem van de Graaff at Faculty of Science
Prof. T.NagaeThe spokesman.
Prof. K.Imai has retired this March.
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijingf-SANS
RadiographyDetector, device R&D
基礎物理
SANS
Old Tandem
p, 3.5MeV, Iave<0.15mA
9Be(p,n)7Li(p,n) pulsed cold neutron
(0.7-2.3)×1011 n/s7Li(p,n)8Be+γ
p (3.5MeV)
N
14
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Layout as of 2010.8.13
N
10m
3.5MeV p-linac
Tandem
Fcourse
Gcourse
H course
3.5MeVp-linac
Beam Dump
VCN-f-SANS?
ProductionTarget
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Specifications3.5MeV, <15mApk, <100µAave.<100Hz, <0.1ms, duty <1%, Beam Power < 0.35kWCompact(< 4m)✓ low energy✓ less shield and moderator➡ gain neutron flux
pLinac will be installed this year.Hope further progress (in budget?).
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
M.R. Hawkesworth, Neutron Radiography: Equipment and Methods,
Atomic Energy Review 15, No. 2, 169-220, 1977.R.W.Hamm, Proc. SPIE 4142 (2000) 39-47
n⋅µC-1 = n/(µA⋅s)
→ ~1011 n/s @ 0.1mAave
Neutron yield
3.5MeV x 0.1mA=350W
!!"#$%&'()'*&$+%,-'."&/01'2,%'/,3'&-&%#.'45%+"6/&'7&58'%&56+",-1)9'
!
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
Li(p,n)
Be(p,n)
Low Neutron Energy
1µC = 6x1012 p2x109 n/µC-1
→one n / 3000 p
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
100
105
1010
1015
1020
1930 1940 1950 1960 1970 1980 1990 2000 2010 2020Effe
ctiv
e th
erm
al n
eutro
n flu
x n/
cm2 /s
Chadwick
350mCiRa-Be source
Bercray 37" cyclotronCP-1
CP-2
X-10
NRXMTR NRU HFIR
HFBR
ILL
ZINP-P
WNRZINP-P'
IPNSISIS
SINQFRM-II
SNS
How weak?
KENS
J-PARC JSNS
IncubationComponent R&DFrontier Study
optics/detectors (UCN preparation)
Education Kyoto
better than1010
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History of neutron sources. Updated from Ref. [4].
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
VCN-focusing-
SANS
VCN-f-SANS
using modulating PMSx lens
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Small Angle Neutron Scattering
€
q =4π sinθ
λ,
d =2πq, 2θ ≈ λ
d
ki
kfq2θ
⇒Particles
1. Size(rotating radius)2. Form (sphere/clinder/…)3. Surface structure
Neutron’s features … sensitivity to light elements
e.g. H, Li, C, N, O,… ⇔ SAXS
magnetism ferro-, antiferro-, spin glass…
excitations e.g. atomic motion (vibration,
libration, diffusion,…)
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
small size sample
Cold Neutron (CN) + small θ → Very CN + large θ on-sample focusing is applicable
SANS = low q?
€
q =4π sinθ
λ
ex. q=0.031Å-1 (micell of Pluronic)
2θ[º] v[m/s] E[meV]Cold Neutron 5Å 1.41 800 3.3
Very Cold Neutron 40Å 11.3 100 0.05
VCN-f-SANS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
rot-PMSxrotating ‒ Permanent Magnet Sextupole
€
|B |= 12g'r2,
g'; sextupole field gradient
5VCN-f-SANS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Inner: 18 sectionsOuter: 12 sections
Permanent Magnet sizeID=15mmOD=80mm
VCN-f-SANS rotating ‒ Permanent Magnet Sextupole
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
1.0
2.0
3.0
4.0
5.06.07.0
0 10 20 30 40 50 60
G' [T/m2] zf=2.2 @2.6m38Å
Time [ms]
60ms67-113 m/s28-48Å 1Å step
28Å
48Å y = 2.2*cos((m0/30-m1)*pi)+3...
ÉGÉâÅ[íl0.0482120.18399m1
NA0.19101ÉJÉCÇQèÊNA0.98274R
ToF methodSynchronization between rot-PMSx and pulsed VCNVCN-f-SANS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Well Synchronized Off Synchronization
VCN-f-SANSFocusing Test: Beam size
Caution: different scales!25
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
■tof length : 4790/5090mm ■optics : ø5mm - ø14mm■frequency : 16.7Hz(60ms) ■opening angle : 3ms■polarized by magnetic super mirror (by K. Andersen)■spin transport field : > 50Gauss■band width : 30 ≤λ≤ 48Å
d=2265/2565mme=100/465mm(a+b=260mm
c=2265mm(
øø
ø
Δλ/λ = 6.8±1.5%
VCN-f-SANS setup overview sample focus
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
PEO100-PPO65-PEO100 ; the water soluble triblock copolymer
0 temperature [Cº]15 30
unimer
formation of spherical micelle
loss of long range order
(disordered)
formation of gel(long range order)
4±2 28±2 51±2 70±2
Drawings : Jyotsana Lal (ANL) private communications
non-ionic polymeric surfactants
Sample: Pluronic F127 in D2O 15wt%
27
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
VCN-SANS results for Pluronic F127(15wt%)
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Δq=0.001Å-1
qmin
Å-1
qmax
Å-1
VCN-SANS 100mm
0.009 0.1(0.3)
VCN-SANS465mm
0.004 0.08
SAND(IPNS)
0.007 0.5SAND 0.007 0.5
VCN-SANS 465mm 0.08
(0.3)0.10.004
VCN-SANS 100mm
0.009
VCN-SANS vs. SAND@IPNS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Future PlanVCN-f-SANS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Scaling Laws1) Lens focal strength is proportional to
(lens aperture)-2 x (lens length)2) Solid angle of the lens aperture is proportional to
(focal strength) -2
3) The total distance is scaled as (focal strength) -1
4) The focal length is proportional to (wavelength) -2
5) Rep. rate of the chopper can increase for the shorter total length .
When we use three set of the same PMSx, the total length would be 5/3m, which is less than 2m (not 5m).
VCN-f-SANS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Figure of MeritVCN-f-SANS
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Concluding RemarksPL will be delivered by the end of Dec. 2010. –
Will help to enhance the neutronian's activities: Education, Incubating new ideas, etc.
PECRIS R&D is on going.(Far upstream)
f-SANS with VCN can be very short and handy.
rot-PMSx version is under investigation.
Ultra Cold Accelerator based Natural Sciencejust a poor playing words:
33
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Thank you!
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AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
Appendix
35
Date(2010/02/19) by(H.M.Shimizu)Title(中性子源の概要)Conf(量子ビームイメージングワークショップ) At(Kyoto)
page 36
JENDL-3.2 PLOTS
10MeV
1MeV
100keV
10keV
1b
4b12b20b
70keV
300keV
2.3MeV
中性子遮蔽 (+中性子減速)cross section of 1H+n
鉄 コンクリート21cm 56cm
J-PARCで用いられている減弱距離
AccLab BmSci ICRKyotoUniversity
UCANS-I, 2010, Aug., Beijing
10-5
10-4
10-3
10-2
10-1
100
101
102
10-1 100 101 102 103 104 105 106 107
ElasticCapture
Cro
ss S
ectio
n [b
arn]
n Energy [eV]
Cross-section of H + n (from JENDL-3.3 [2]).
1MeV
20b
Date(2009/12/07) by(H.M.Shimizu)Title(小規模低速中性子源による研究展開)Conf(教室談話会) At(Kyoto)
page
Moderator
38
Date(2009/12/07) by(H.M.Shimizu)Title(小規模低速中性子源による研究展開)Conf(教室談話会) At(Kyoto)
page
Heat Load
39
Date(2009/12/07) by(H.M.Shimizu)Title(小規模低速中性子源による研究展開)Conf(教室談話会) At(Kyoto)
page
Beam Intensity
40
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