ProceωingsProceeding s ofof Ibe the Fi Fift自h Inlemalional International SympSymposiu叩 umm on onon Advanced Advanced NuNucleacJ .ar r Energy Energy RResearc田曲目h -NEUTRONS—NEUTRON S ASA S MICROSCOPIC PROBES- PROBES— P-602P-60 2 NEUTRONNEUTRO N SPINSPI N ECHOECH O SPECTROMETERSPECTROMETE R ATAT JRR-3MJRR-3 M Takayoshi Takayoshi Takayoshi TAKEDA ,， Shigehiro Shigehir o KOMURA ，, Hideki Hidek i SETO ，, Michihiro Michihir o NAGAI,， Hideki Hideki Hideki KOBAKOBAYASHI Y ASHI ,， Eiji Eij i YOKOI ，, *Tooru *Toor u EBISAEBISAW WA A andand 本*SeijSeiji i TASAKT ASAKI I Faculty Faculty Faculty of o f Integrated Integrated Arts Arts andand Sciences ，, Hiroshima Hiroshim a University University 1-7-1 1-7-1 1-7-1 Kagarniyama Kagamiyama,， Higashi-hiroshima-shi ,， 72472 4 Japan Japan *Research *Research Research Reactor Reactor Institute ，, KyotoKyot o University University Noda ，, Kumatori-cho Kumalori-cho ,， Sen-n Sen-nan-gun 加 -gun ,， Osaka-fu ,， 590590-0 ・04 4 JapaJapan n ABSTRACTABSTRAC T WeW e havehave designed designed andand havehave been beecons n constructin凶 cting g at at C 2.・22 cold cold neutron neutron guide guide port port oof f JRRJRR-3M・3M ，, JAERI ，, a neutron neutron spin spin echoecho spectrometer(NSE) spectrometer(NSE) whichwhich is is equipped equipped witwith h twotw o optimized optimized magnetsmagnet s for for neutron neutron spin spin precession ,， a position position sensitive sensitive detector(PSD) ,， a converging convergin g polarizer polarizer andand .a a widewide arl are伺叩a analyzeralyzer. 百Thle e dynamicdynamic range range of of o f scattering scatterin g 'vector vector Q eovers covers fromfrom O.OlAO.OlA-・1' to to 0.3A.l 0.3A-" andan d that that ofof energy energy E fromfrom 30neV30ne V to to O.lmeV.0. 1 meV. This This spectrometer spectrometer makesmake s it i t possible possible to to study study aa mesoscopic mesoscopic spatial spatial spatial sstructurlrU cture e ofof the die order order of of トl~100nl00nm m combinedcombine d with with a nanosecond nanosecond temporal temporal structure structure structure of of the the order order of of 0.1-100ns 0.1 ~100ns COcorrespondinl1・ esponding g to to dynamical dynamical behavior behavior of of large large molecules molecules molecules suchsuch as as polymer. polymer. A test test experiment experiment showsshow s that that the the homogeneity homogeneity condition condition condition ofof the th e precession precession magnetmagne t is is loosened loosened byby meansmean s of of PSDPSD. INTRODUCTIONINTRODUCTIO N TheTh e neutron neutron spin spin echoecho (NSE)(NSE ) methodmetho d proposed proposed byb y MezeiMeze i provides provides anan extremely extremely highigh h energy energy energ y resolution resolution in in analyzing analyzing small small energy energy changes changes ono n scattering scattering as as a phase phase shift shift in in the the LarmorLarmo r precession precession of of each each neutron neutron spin spin in in a magnetic magnetic field. "l) TheTh e wavewav e veclor vector Q and and Fourier Fourier time time time t dependent dependen t correlation correlation function function I(QI(Q,t) ，t) of of an aninvestigated investigated system system is is observed observe d directly directly in in the the the NSENS E experimenexperiment t. ThenThe n S(Q,o))S(Q ， ω~ can can be b ecalculated calculated from from /(Q I(Q,t) ，t) by bymeans means of o fFourier Fourier transformation. transformation. 百Thle e Fourier Fourier time time t is is given given 払as, 't=( = (2|7nN»i„司%担Nm~/h3)2//j3);iλ 3£3D> or or or in in unit unit of of s,， F--tA、，， t[s] t[s] r[s] = 1. 1.8638635 5 xx 10 10・10λ10X,，3[A]D[Tm] 3[A]D[Tm] ，, (1、) whereλiswher e X is the the neutron neutron wavelength wavelength in in unit unit of of A andand D the the magnetic magneti c fieLd fiel d integral integral in in unit unit o of f Tm.Tm . Th e magnetic magneti c field fiel d integral integral D along along the the neutron neutron path path is is given given by.， PEE--1'aaaa， 今 崎，‘ D 岡戸」，，ιB勺& B4内 B4AV- AU = U + + m D = I |B|d/ =一- I [B?ア匂 + E}r + B]\ dl , (2) (2) J， -959- 円 where wherewhere B: Bt,， B n andand B;B+ are are the th e axial axial z z,， radial radia l rr and and azimuthal azimutha l It <l> components component of s the of thmagnetic e magnetic field field B. dl a7 is is the the element of of the the length length along along the the neutron neutron papath此. TheThe dynamic dynamic range range of of t cancan bebe varied varied varied byb y the the magnetic magnetic field fiel d strength. strength. TheTh e maximummaximu m Fourier Fourier time time tm tm or or maximummaximu m field field integral integraintegral l DDm m determines determines the the achievablachievable e spectraspectral l resolution resolution AE=TiAcod. E=h d. ωof o fthe th espectroscopy. spectroscopy.The The spectral spectral spectra l resolution resolution d. AEE is is defined defined by ,， d.E d.E AE=hAo)= n d. ω= = O.050.05h/tñ/tm. • (3) (3) OnO n the the other other hand ,， the th e energy energ y resolution resolution oE6£,， whichwhic h is is determined determined byb y the the inhomogeneity inhomogeneity ofof DD,， in i n contrast contrast to to d.E AE is is given given by ，, 5E=28E = 2守A&E,E ， (4) (4) wherewher e d.DAD is is inhomogeneity inhomogeneity of of D andan d E is is the the energy energy ofof the th e incidint incidin t neutrons. neutrons. WeW e havehave designed designed an an NSENS E spectromc spectromete町r in in order order to to study study a mesoscopic mesoscopi c spatial spatia l structure structure of ofof the the order order ofof トl~100nl∞nmm combinedcombine d with with a nanosecond nanosecond temporal tempora l structure structure ofof the the order order ofof O.l-lOOns O.l-lOOns 0.1~ 100ns corresponding corresponding to to dynamical dynamical behavior behavior ofof large large assemblies assemblies mademad e ofof medium-sized medium-sized molecules molecules molecules andan d ass.:mblies assemblies ofof large large mo1ecules molecules andan d a1so also to to dynamica1 dynamica l critical critical behavior behavior ofof 2 2) 紅白 2 ・ condensed condensed condensed maUers. matters. ' TheTh e NSENS E spectrometer spectrometer sh shares the the C 22・.2 cold cold guide guide port port ofof JRRJRR-3M3M ,， lhe the monochromatemonochromater丸山, the neutron neutron guide ,， the th e sample sample table table andand 恥the dancing dancing floor floor commonlycommonl y with with the the the neutron neutro n spectral spectral modu1ation modulatio n spectrometer(NSM).3) spectrometer(NSM).3> TheTh e par part lS s whichwhich are are shared shared with with the the NSMNS M spectrome spectromete句r andand the the tables tables for for the the polarizer ,， precession precessio n coil ,， ana1yzer analyze r andan d detecto l" r have have beenbeen constructed. constructed. OtherOther parts parts are are being being constructed. constructed. TheTh e precession precession coil coil will bebe constructed constructed constructed byb y the the enden d of of MarchMarc h 19931993. WeW e havehav e c-arried carried out out a test test experiment experiment of of NSENS E using using the the parLS part s constructed constructed andand the the parts parts ofof anoanothe出er r NSENS E spectrometer spectrometer whichwhich wew e hadha d constructed constructed at at KUKUR. R. 4) 4' In In In this this papaper.，e r,， wew e give give tthb.; ; design design of of the the NSENS E spectrometer spectrometer andand 出thaat t ofof the the precession precession coil coil in in in detei deteil l. Finally ,， wew e demonstrate demonstrate in in 出the test test experimint experiminl of of NSENS E that that the the homogeneityhomogeneity condition condition condition ofof the the precession precession magnetmagne t is is loosened loosened byb y meansmean s ofof the the position position sensitive sensitive detector(PSD). detector(PSD). detector(PSD). 0 1-2 IE IE 12m 11m > Fi Figg.l . 1 百Thle e whole whole view view of of the the neu neutro位on n spin spin echo ech o spectrometer spectromete r at at JRRJRR-3M・3M.C2 . C2-2・2: : C2C2-・22co1d cold neutrong neutron guid凶de e port ，, M :: monochromamonochromater閣r,， G:G : nneutro側紅ong n guide凶de ，, P: P: polarizer polarizer，, PF: PF : pre precessio偲 ssion n ∞coilil ，, S: : sample sample，, AA :阻: analyzeal 戸er r and andD D: :detector detector DESIGNDESIG N OFOF THETH E SPECTROMETERSPECTROMETE R -960--960 — WeW e havehav e designedesigned d aan n NSENS E spectrometer spectrometer at at 山theCe C2.-2 colcold d neutroneutron n guid巴e porportof t of JRR-3JRR ・3MasM as shownshow n in in Fig. Fig . 1. 1. TheTh e dynamicdynami c range range ofo f scattering scattering veevectoi" or r Q covers covers fromfro m O.OlA-1 0.01 A-1 to to 0.3 0.3AA- 1 and and that that that ofof energyenergy E fromfro m 30neV30ne V to to O.lmeV.O.lmeV . SomeSom e of of the the design design parameters parameters ofof the the spectrometer spectrometer are are are Ii liste sted d in in Table Table 1. 1. TheTh e reflected reflected neutrons neutrons byb y a multi-layer multi-layer monochromatermonochromate r al at the the C 2--22 port port pass pass through a 9m neutron guide and reach a polarizer. The monochromater has a pass through a 9m neutron guide and reach a polarizer. Theo monochromater has a wavelength wavelengthwavelength resolution resolution ofof about about 10%10 % in in the the wavelengthwavelength range range 55~8A向 8λ.