Upgrade of Hokkaido University Neutron

Source (HUNS)Michihiro Furusaka

古坂道弘Faculty of Engineering

Hokkaido University

�1

Hokkaido University neutron source

(HUNS)�2

Original one

Stopped operation

in Oct. 2017

"Pulsed" "Cold" Neutron Source• Electron Linac

• 34 MeV, 35 µA,• Since 1974

• Pulsed & Time of flight• 50 pps, 3µsec electron pulse

�3

1.2 kW

Stopped operation

in Oct. 2017

50 PPS, 3µsec

HUNS upgrade:1.2 kW to 3 kW

�4

Upgrade in the final stage.

First beam in May

New electron accelerator�5

3 m AcceleratorTubes

7.5 MWKlystron

3 MeVInjector

• Same ≈34 MeV(full loading)1.2 kW ➜ 3 kW

• 50 pps ➜ 100 pps• pulse duration:

3 µsec ➜ 4 µsec

7.5 MWKlystron

Modulator

Acceleratorcontrol

Electron injector�6

Electron Gun

buncher & Prebuncher3MeV-250mA Accelerator 8µsec

1.4MW RF550 W RF

Construction progress�7

Accelerator removed

supports

Alignment

New accelerator tube

Installed

Construction progress�8

Secondhand Accelerator tube from AIST

National Institute of Advanced Industrial Science and Technology

Injector and Two Accelerator tubes Installed

Construction progress�9

Wave guides,Phase shifter

Old and new Control systems

New

Construction progress�10

Cooling water installed

Neutron target stations�11

Same as before

Coupled cold neutron source�12

cold neutronsource

currently Mesitylene to be Methane

10 cm Pb inside

20 cm Borated Polyethylene

Shielding

improved

We will use it as it is.

Cold

Thermal & fast, Neutron/X-ray Imaging�13

Elevatorneutron/X-ray target change

Fast neutrons forsingle event effects

NTT, Fujitsu,

Hitachi, NEC

We will use it as it is.

Fast

Acceleratorparameter choice

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Neutron yield�15

> 30 MeV chosen

Klystron choice• S band• 7.5 MW peak power

• 9.5 kW average• 160 kV-116 A

• RF pulse width: 5.0 µs• Repetition rate: 250 pps

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• Toshiba• E3772A

2 accelerator tubes for HUNS upgrade�17

HUNSHUNS upgrade

Ex: 4 µs 100 pps0.04% dutyPeak current: 0.25A, Averaged current: 100µA≈30 MeV, 3 kW

3MeV injector

+ 2 accelerator tubes

Intensity comparedR. Ishida

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1.E+06

1.E+07

1.E+08

1.E+09

1.E+10

1.E+11

1.E+12

1.E+13

1.E+14

1.E+15

1.E+16

1.00E-04 1.00E-03 1.00E-02 1.00E-01 1.00E+00 1.00E+01

Tim

e Av

erag

ed n

eutro

n br

ight

ness

(n/c

m2/

s/sr

/eV)

E (eV)

ILL-thermal

ILL-Cold

J-PARC(Port15)

J-PARC(Port22)

J-PARC(Port20)

ISIS CH4 (160kW)

KENS-CH4

KENS-H2O

HUNS upgrade

HUNS-R_CH4(sasaki simulation)HUNS-R_C9H12

HUNS-C_CH2

HUNS-R CH4

Time averaged intensity comparison�19

Compiled by T. Ishida, Hokkaido University

KENS

ISIS LCH4

J-PARC

HUNS

ILL

HUNS Up

Time averaged

Currently

mesitylene

moderator

The instrument iANS using very short flight-paths

Pronounced like “Irons”�20

intermediate-Angle

Neutron Scattering

Optimized to a

nanoscopic region

T. Ishida and M. Ohnuma, Hokkaido University

Production measurements�21

TiC precipitates in steels (2015.10)

SANS

ODS steels (2015.11)

×13~×16 SAXS

SANS

SAXS

Precipitates are TiC: ×14

Several hours

1 0.2 10 Q /nm-1

1 0.2 10 Q /nm-1

Inte

nsity

/cm

-1

Inte

nsity

/cm

-1

Collaboration with

3+ major steel making

companies.

Production measurements�22

Al alloys：7000 series（2015.12)

SAXS

SANS

×225

Precipitates areTiCMgZn2: 230

Many others

Collaboration with

3+ major steel making

companies.

Focusing mirror SANSS. Takeda, N. Yamada,

Y. Yamagata, T. Hosobata, T. Oda, J. Guo, J. Kato,

M. Hino, et alHokkaido Univ., Riken, KUR, KEK

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A focusing SANS instrument�24

Focusin

g mirr

or

Scintill

ation

detecto

r

ZnS+RPMT

• Ellipsoidal mirror

for low-Q

Compact Focusing SANS@HUNS• Nano precipitates in an Ni alloy

• Only 300 mm × 20 mm focusing mirror, 3.5Qc• 2, 4, 6.2 mmφ pinhole choice

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J-PARC iMATERIA

cfSANS@HUNS

Q（nm-1）

Intensity

L2=700 mm

L2=450 ｍｍ

Focussed beam�26

1 mm first aperture

Bragg-Edge Transmission Imaging

H. Sato, M. Sato et al, Hokkaido University

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@HUNS

Ferrite-Austenite volume fractiontest sample

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75 mm

75 mm

5 mm

Austenite（SUS304）

Ferrite（SS400）

Transmission spectra�29

Bragg edges

Calibration curves�30

0.00.10.20.30.40.50.60.70.80.91.0

0 15 30 45 60 75

Vol

ume

frac

tion

of F

erri

te

Position x (mm)

HUNS

J-PARCRADEN

Summary�31

Summary• Hokkaido University Neutron Source, HUNS

• Stopped operation in Oct. 2017.• HUNS accelerator upgrade to 3 kW

• Major components installed.• Intermediate-angle neutron scattering

instrument, iANS• Working with 3+ major steel making companies.

• Compact focusing SANS• Successfully got low-Q data in Ni-alloy

• Bragg-edge transmission instrument• Much improved resolution, 0.5%

• (Single event effects; Routine operation)

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Summary• Hokkaido University Neutron Source, HUNS

• 1.2 kW, since 1974• HUNS accelerator upgrade to 3 kW

• Major components installed• Intermediate-angle neutron scattering instrument, iANS

• Working with 3+ major steel making companies.• Bragg-edge transmission instrument

• Much improved resolution, 0.5%• Compact focusing SANS

• Successfully got low-Q data in Ni-alloy• Single event effects; Routine operation

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We can do many

REAL

measurements!