A New Polarized Neutron Reflectometerat Materials and Life Science Facility of J-PARC

TAKEDA Masayasu1,2, YAMAZAKI Dai1,2, SOYAMA Kazuhiko1,2, MARUYAMA Ryuji2, YAMAZAKI Tatsuya1,

AIZAWA Kazuya2,ARAI Masatoshi2, KANEKO Koji3, NAKATANI Takeshi2, OIKAWA Kenichi2,SHINOHARA Takenao2, SUZUKI Junich2,

SUZUYA Kentaro2, TAKAHASHI Nobuaki2,TAMURA Itaru2,4, HIRANO Tatsumi5

1 Quantum Beam Science Directorate, Japan Atomic Energy Agency,Tokai, 319-1195 Ibaraki, Japan, takeda.masayasu@jaea.go.jp

2 J-PARC Center, Tokai, 319-1195 Ibaraki, Japan3 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1195 Ibaraki

4 Department of Research Reactor and Tandem Accelerator,Japan Atomic Energy Agency, Tokai, 319-1195 Ibaraki

5 Hitachi Research Laboratory, Hitachi Ltd.,Hitachii, 319-1292 Ibaraki, Japan

Neutron Optics(refractive index)

Polarized Neutronreflectometer J-PARC

No. 2

R1 R2R3R0

n1

n2

n3

n4

d4

d3

d2

d1

!

ni, ± (! i, b i, pi, Q ) = 1 –16"! i (b i ± pi)

Q2

density

nuclear scattering lengthmagnetic scattering length

spin state of neutrons

reflectivity R (ni ,di, Q, ), i = 1,2.....N

polarized neutrons

Polarized Neutronreflectometer J-PARC

No. 3Polarized Neutron Reflectivity

(Ex Exchange Bias)

Ru(2)

Cu(1)

FMCoFe(2)

AFMMnIr(5)

Ru(5)

Ta(5)

Sub.

M

Jk

Magnetized

H=10kOe Reference(bulk) Result

CoFe 1.75 µB 1.73 µB

X-ray Reflectivity

Polarized Neutron reflectivity

Polarized Neutronreflectometer J-PARC

No. 4Polarized Neutron Reflectivity(Off specular reflection )

4 in-plane structural information

Exp

Cal

Katharina Theis-Bröhl et al.(PNCMI 2004)

New Reflectometer (feature)

Polarized Neutronreflectometer J-PARC

No. 5

outside JapanILL:2, LLB:2,OPAL:1, HMI:2, FRM-II:2,NIST:4, ...

SNS:2, ISIS:2+3,...in Japan

JRR-3:2(MINE, SUIREN), MLF:1 (BL16 ARISA-II）Solid State Physics

(magnetism)polarized neutron

micro beamBL16

Free Surface& Soft matter

Material Life Science Facilityat J-PARC

Polarized Neutronreflectometer J-PARC

No. 6

JRR-3Liniac

3GeV

50GeV

MLF

Kamioka

Material Life Science Facility（Experimental Hall)

Polarized Neutronreflectometer J-PARC

No. 7

operated operated operated

operated

operated

operatedoperatedoperated

operated

commissioning

commissioning

commissioning

construction

construction

construction

construction

construction

ARISA-II (KEK)

NOVA （NEDO, KEK）

TAIKAN (JAEA)iMATERIA (Ibaraki Pref.)

TAKUMI (JAEA)

AMATERAS (JAEA)

HRC (KEK, ISSP)

iBIX(Ibaraki Pref.)

NNRI (Tokyo Tech. U., JAEA, Hokkaido U.)

NOBORU (JAEA)

NOP (KEK)

PLANET (JAEA, U-Tokyo...)

SuperHRPD (KEK)

4SEASONS

（JAEA, KEK, Tohoku U.）

DNA(JAEA)

operated

commissioning

construction

935BL17

New Reflectometer (BL17 Coupled moderator)

Polarized Neutronreflectometer J-PARC

No. 8

108

109

1010

1011

1012

1013

1014

1015

Tim

e Ave

rage

d In

tens

ity(n

/cm

2 /s/s

r/eV

)

0.0001 0.001 0.01 0.1 1 10 100 1000Energy(eV)

0.1 nm1.0 nm 0.01 nm

JSNS Coupled(1MW)(Port15)ILL-Cold(56MW)ILL-thermal(56MW)JRR-3M Cold Exp(20MW)JRR-3M thermal(20MW)

J-PARCJRR-3（Cold）

JRR-3（Thermal）

Time averaged neutron flux

ILL（Thermal）ILL（Cold）BL17 Coupled Moderator

moderator decoupled cold moderatorflight path length 15.5 + 2.5 = 18.0 m

wavelength band 0.2 < λ< 0.8（nm）（polarized）0.1< λ< 1.0 (nm)（unpolarized）

scattering angle < 25 deg.Reflectivity 1 - 10-8

specular reflection0.04 < Qz < 14.0（nm-1）（polarized）0.04 < Qz < 28.0（nm-1）（unpolarized）Qz分解能：ΔQz /Qz > 0.02

off-specular reflection 0.005 < Qy(λω/2) < 0.02ΔQy /Qy < 0.1

detectors 0-d 3He gas, 2-d MWPC, 2-d scintillation counter

New Reflectometerparameters

Polarized Neutronreflectometer J-PARC

No. 9

Polarizer2 coil spin flipper

Sample

Mezei flipper

Analyzer

2D PSD

Wavelength range 0.21 nm ＜λ＜ 0.84 nm

Polarizer Polarizing supermirrors (m=4)Double transmission

Analyzer Stack of polarizing supermirrors (m=4)Perpendicular alignment of the analyzer mirrors with respect to the sample

Flipper 2 coil spin flipper, Mezei flipper

New Reflectometerpolarizing system

Polarized Neutronreflectometer J-PARC

No. 10

Polarized Neutronreflectometer J-PARC

No. 11New Reflectometer

detectors1. Prototype of 2-d MWPC with individual read-out

MWPC + individual read-out (40 x40 cm2, 1mm pitch) (x: 40ch,Y: 40ch) Spatial resolution

High spatial resolution < 2 mm

2. 0-d 3He gas counter

3. 2-d scintillation counter(10B2O3 + ZnS)

Polarized Neutronreflectometer J-PARC

No. 12New Reflectometerbeam line design

neutron

DC1 DC2 DC3

DC:disk chpper

T0 chpper pol-unpol switcher

spin flipper

S1 S2 S3 S4 S5

beam monitor

Polarized Neutronreflectometer J-PARC

No. 13

neutron

detectorbiological shield

2θ arm

S7S8

flight tube

sample table

flight tube(+SF)

(analyzer)

New Reflectometerbeam line design

T0 branch

TOF trigger

0d-Detector

VETOs

T0 dataEvent data

Event dataEvent data

T0 dataClock data

0d-Detector data

StartStop

Readout + SiTCP

Readout + SiTCP

Readout + SiTCP

CPU DAQ

DAQ System Diagram

Main Control

T0, VETOs

CPU DAQMWPCusing 3He gas

RPMT

2D-PSD×2using wavelength shifting fiber

ReadoutGate + SiTCP

GateNET

Neutron Monitor Detector

T0 data

Instrument clock dataNeutron Monitor data

Polarized Neutronreflectometer J-PARC

No. 14New ReflectometerDAQ system

Material Life Science Facilityat J-PARC

Polarized Neutronreflectometer J-PARC

No. 15

JRR-3Liniac

3GeV

50GeV

MLF

Kamioka