Development work for the Japanese LCT coil and its design and construction

Development work for the Japanese LCT coil and its design and construction S. Shimamoto, T. Ando, T. Hiyama, H. Tsuji, Y. Takahashi, M. Nishi, E. Tada, K, Yoshida, K. Okuno, K, Koizumi, H. Nakajima, T. Kato and K. Yasukochi* t Superconduclmg Magnel Laboratory, JAERI, Mukalyama, Naka-machl, Naka-gun. Ibarakl ken, 31'1-02 Japan * Nd~on Umverslty, Kanda Surugadat, Chtyoda-ku, Tokyo, '101 Japan Recerved 14 October 1984 This Paper describes lhe design, verihcalton lesls, and c o n s l r u c l t o n ol Ihe Japanese tesl cod Io= Ihe Large Coil Task(LCT) under I h u a u s p l c e s o l lEA The Japanese LCT cod was des~gned Io be a pool-cooled, Nb-T=, tully-slabihzed (:oil w t l h an nperalmg currenl ol 10 2 2 0 A al 8 T. Through resear(.:h and rieveh.')pmenl ol Ihe Japanese LCT cod, n e w advances in superc, o n d u c l m g cod l e c h n o l o g y were acclutred, such as mechanically and chemically Irealed conduclc)r surlaces Ihal have high heal Iranster (aboul lout limes grealer Ihan usual). During Ihe c:onslruclton ol Ihe cod, n e w tabrtcalion lechntques were developed Io w i n d lhe large.., current c o n d u c l o r tnlo a mechanically rigid c(')d and Io conslruct a Iolally stable large cod. These advanlages made tl possd:)le Io conslruct Ihe Japanese LCT coil w h i c h was c o m p l e l e d in the sprmg ol 1 9 8 2

Keywords: superconducting magnets; LCT coils; magnets

.IAE RI slarled Ihe design ~1 Ihe Japanese L,C'T coil in A p r i l Iq'7H hased ~m Ihe c,.I spe~..'lfiCall(ms prepared by Oak Ridge NaliLmal L,ahoralorv ((.)RNL,), I.ISA. AI Ihe beginning ol Ihe desq.:n princess, .IAERI decided Ihe h~llowlng guidelines

I

c~.fllng - po4d co4fllng, c~mduch~r - NbT'L high aspe~.'l ralio',

~;

winding - edge wise w~mnd, pancake',

,4

oJtl cas¢ - wltli h~lls and seal welds

In seleclmg Ihese opll(m.~, JAERI evalualed p~sMble

lechnologwal developmenls I'r~m Ihe ,siluallon tn Japan al Ihe beginning ~1 Ihe design period These decisions have Io be made empincallv, hul they are very miporlanl in carrvtng~ml Ihis kind ol development work. As a resull ol Ihese choices and Ihr~mgh Ihe conslruclton ol Ihe LCT coiL Japanese lechnolog;v m Ihe lahricam.m ol superc~m dueling magnels became highly developed., and Ihe Japanese L(."T coil was Ihe firsl lu he finished, Maj~)r parameler:, ~1' Ihe .Japanese LC"T' cod are shown in 'T'ublv I

Conductor (.;Ltidelines Ior Ihe design ,T,I the Japanese L ( " T conductor were I

to m a i n l a m stability under all possible c o n d t l i o n s ol crihcul currenl degradalion, heal Iransler, cl~pper rest,.,,liviry and s() ()n,

I De(.:ea'=,ed

$03 00 I,.) '198~ Bulll-,rvvulqh ~ Co (F't.lbhrdle,r,,..~)Lid

Table 1

De,.qgnparamHlers ol Ihe Japanese LCT ~.:ud

Supercc md u~.:lOt

Nb-T=

Coohrlg

Pool c.oolmg (nalural convecltun al 4 2 K)

Winding concepl

Edge-wise, two gradmgs 20 double par=cake'..

Condul,l()r IypP

Suldered L',able =rl a rPclangular c,opper slabthzer wtlh r~,Jghened suflac,P

Raled cuHenl ,..11 8T

10 220 A

Number ol lurm:,

658

Wmdlng L,ur f erll denslly

Average 26.6 A mm z 8 T grading 24 2 A mm 2 5 T grading 30.3 A ram"

Sell mduclanc~

20H

Slruclural malerlal

Ntlrogen-slrenglhenP, d 304L slamless sleel

Assembly

Boll and seal weldmg

MaK vollage lu earlh

10kV

Ma.. uperdliunal

0 5 MPa

pressurt-, Hehum mvenh~ry

1730 I

Wmdm .q wetghl

I B Ions

Slruclure wetghl

2 I lun!.,

0011-2275/85/050227-(.)7

C r y o g e n i c s 1 9 8 5 Vol 2 5 M a y

227

Japanese LCT cool: S. Shimamoto el al. ,

,

,

,

,

~,,,,,~

-

"E

................

.............

;?

B 8T

I.CT ('.()NFILII;T()R ', ')(.)J /

{Z..I

,'~UI',,I

08 ~ /H~QI

I- 0 6

//

(Jen~|(.lliorl

(;ooilrlg (',ilrw, Cu|vP,

(8'["

.~TRE .L; ANAI_¥!';I!.;

.J

300

,7-

L~()(J

I.JJ

IJJ

T 4 :.~K i'l)

,=..jI.LI ~.

,,f

I.LI •J IJE

~N

I.',,

,.~ tJ I ()(.)

" ()4

(:()LL) u REI')IJC]"i()N (%)

)--

13 I;" II Mt]x !.;TABLE (;LIRI:ENT (kAI

O ~' |

I

i

i

r,:i
I

Ideq)

Heal Ir~nsler characterosltc,= uI the developed conduclor ,~urlace lot Ihe Japanese LCT cod ('besr c')r 'worsr depends on Fig. 1

Ihe angular p,osilton)

Fig. 3 Opltmlzalton ol conduclur employed ,n Ihe LCT design

C:ross '.Jet:lion VIeW ol the, ,Japanese LCT L:undlJciuf

h) keep Ihe maxm~urn slress ~n file cclnduclor wilhnn 2/~ ol the yield strenglh ()1 Itle copper .slahihzer hl keep the aspect ralt() , 2 h)r Ihe reduclilm t)l pulse h)sscs The heal Iransler characteru,,lics t)l tile c,mduch)r surlace are i m p u r l a n l I'u~.lurs in research on .`,table poul L'~.lled cunducl,i)r.,.; J A E R ] measured Ihe heal Iranslcr charac lerl',;lics of :~,2() dtl'l'ererH surlaces and rmally deve. loped a surface roughened by chemtcal t)xidtzalton w i l h excellcnl characleru.;lics a~ .,.;ht)wn in F)g / ~ The cr¢),~.~ seclu.)n oI' the Japane,'.,e L C T L'onduch~r ix sh,lwn nn F'~g 2 T i l e m a x i m u m equal area heal flux ,:, I ~ W cm-", wh..'h t,,,,abt)ul four llme,',, grealer lhun lhal ~)I a llal ,.,ur lace T h i s heal IrarLsler character(siRe ns degraded by marly ellecls such a.'., ma.'-,ktng hy Sl'~acers. t n c h n a l i o n ol Ille surlace h) Ihe verlicaL and Stl ,In, hut nn .,,,pnle ol these problems Ihe surlace u..,expecled I t enable Itle conduchtr to be l u l l y .'.;lable up Io 124% t)l the t)peraltng currelll Sire.'.,'., analysis demanded a conduch~r yield .,.;trenglh ,fl' 2~', M P a Ft~r Ihts rea.,.,m a c(dd wt~rked c~pper .,.;labnlizer wa,~ ennph)yed As ,sh~)wr, nn [)g 3, Ihe increase Jrl Ihe yteld slren~lh hy cold drawing? inevtlably

Cryogentcs

1985

Vol 25

May

slrenglh

10

and

slabtltly

rcsull.'.; in Ihe r e d u d l u n o l ' s l a h t l i w due hJ, Ihe mcrcase ,n Ihe resisltwly. As an o p l i m u m 21% hard copper was .~elecled. T h e mechanical requiremenl wax mel hy Ihe c~pper yield .,,;Irenglh or ~i~,(i MPa giving an average cunduL'lor yield slrenglh ul 29~ MPa t n c l u d m g Ihe el'led o1' s u p e r c o n d u c l m g slrands ~ Fur Ihe reducliu, rl ol pulse I,ns.',,es, Ihe a.'.;pecl ralio of Ihe c o n d u c l o r wax made Io be 2 I (26.N , 126 mm) lu reduce eddy currenl loss in Ihe slabtltzer. As Ihe Ihickness o1' Ihe roughened ,surl'ace =.s I 2 mm on bolh side.,,,, the effective aspecl ratn~ ns 2.6(26 N ,, It) 2 t i m ) guying a h)wer loss, In addil..m, m u n o l i l h , c cunl'lguralions of Ihe superc o n d u c l , n g slrands were avo,decL and Ihe conduch)r was c~mposed ol II slrands Ior lhe '¢1 c~mduclor and I~ slrands I'or Ihe X T' conduch.~r Io reduce ccnJpling Ic~.ss between I'llamcnls The Io.,,s analysis method Ior such a large pack ol slrands wa',; newly developed d u n n g Ihc design wurk ,~n Ihe LL"T c~)il, and the val,dll~, ol Ihe analysis wan conl~rmed by vernrtcaliun It.sis' '/"a/~lr 2 surrinlarlzes Itle pararriclers ill Ihe two c,Lmduch.)r grade.~ emphayed Ior Ihe elleclive .slahlhry design i~l the conduch)r Table 2

228

"',,~(

IJ'l

I 1(.')2~')OA)

i,i

Fig, 2

T---"----

;,,,, ql)

.~ I ( ) :"' --) / I.L

T

U)

I~le,,I Cc~)hncj(:urve

1

'=~(.)0 ~ - ~ " - r " ' - " - " ~ - - r

,

14

Parame'lersul the Japanese" LCT t;Itrlduciurs 8 T .qrade

5 T qrdde

Curiduclor IiP,ighl (mm)

26 8

2 1.3

Conduclor w,dlh (mrri)

12 6

12.6

2 I

I. 7

Aspe~.l rail() Operahn.q currenl (A)

10 2 2 0

10 2 2 0

Number ot slr,..inds

15

II

Slrand pack het,qhl (Elm)

17.1

98

Slrand pac,k width (mm)

4.3

3.3

Slrdnr'l r'llameler (mrrl)

23

I 75

Slrand Iwlsl ptlr, h (mm) NiJmt)e'r ol lih..imerils (per Mrarlcl)

I 5(.)

90

1050

1060

Ftldml-'nl rlldmuler (pm)

5(')

38

Fth.,-imunl IWl~.,I ptll;h (mn'0

3(')

25

RusF,

liVity cil uur)per (Nm)

5 iE-'I(.)(EIT)

39E-10(5T)

Copper feducllOn rale ('~,',)

21

21

350

350

Copper yield ~;Irerl.qlh (MPa)

Japanese LCT coil: S. Sh~mamoto el al.

,,~," ' '

i ~

I i ;, I~

".

I,~,,;,~

H+I !IJITI I"~l~ ~IWII£

J

T I,' I,]l],'__l'~ ItIll III__I+IJ 111 ~l

I I '

* '--

r,','+~,

I~--. '," ,'

,--

_ /',~? ....

/ If

I1'

"!

/

I1,'_+" , ,,,,,,,....

i luI~I

~m , iI

jl , /

i' Ill +I

i j

. ,

ILIII'+I 14IIllJ

,ii7 `

' 'Iffi,L?I'T",...,:~.".,.,' ,,,,U-" 'l,,

//I"

,,'l

,"

' ttt: ,..._

-El

I

k'

-'

,,1Ii " I

,+',:,,

iIIllllllll'i',li

w,,.,,,,,,,

i~

,' s,;~

I'ljItl

Fig, 4

'

.,,,,:.\ \ Ij!ll'' ,,' '~, '"t '~' +~'"' -

,,,I

I III]

,~ I

,

~

,:: _,,,,

'.

,, ,.,.,,, .....

I I llll

Slru,;llJlal element,., ol Ihe LCT I:,)ll

%+..~(') I

-!

i

__2' ___J7 -°~

Fig. 6

Arr,~rlge, m~rll,~ rfl {:Uidlriq spal;ers

+.idlusler~. w e d g e s and v(,liJ spacers

The ,llher spacers w l l h l n Ihe w i n d i n g are i n l e r - l u r n in~ulah~[s and Inlerpancake spacers 'The Ihlckness ol Ihe inter lurn insu lal,~[~ is I) ~ mm and Ihe Ihwkness ,fl the inter pancake spacers is 2q rnm T'he laller spacers are Ior c~.dln~a channel.~, allached I~ Ihe surlace ol Ihe r,~tlghened surlace M n , . l l h e d by ~.'(~mp, illlliJs 'Thxs spacer clwers I()'",~ ,il Ihe L ' , m d t l c l , . surla~'e, and channeN h)r helium bubbles are ,

iI

T4 8

Fig 5

Analysis and verifications

ii~,1

In

I

(::r,m,.; stel:lllll'i UI w/irlcllng arid vl%,~l ':~IrlJLIIIJrFP

Coil In lhe desl~.,.ll ,ii r..-,l ~.',liile,J c(lils, lhe c , . l c a s e IS inip(+rI,Jnl n, fl i ) n l y as ;.I h e l i u m c ' , H l l a l n e l b u l as a ;drl.iclural ~'lenienl h) s t i p p , ) r l Ihe eleclrorna~,nellC h)rce In lhv desIL.,n ol lhe LL"T ~.',lll vase J A E R I c a r r i e d , , . i l h, illl ~,Iruclural ,,Ire,.,s analy.,+i,, and rrtal<.'rlals le,qli11~ J A E R I mea,,Ltred vield :d renE,.lh and u l l l m a l e slren~.lh ,il .,+lalnle4s Nleel.~ al .-I I~. ijlilJ I'~nallv ~elecled ,~lalnles,, ~leel ~(14LN. ~'hlch tla.~ a vlehJ ;,Ireil),ltl ,ll :: glI(I MPa T'he a.~4elut~lv drawlrlL., ,ll Ihe c,ul cane is slulwn in I i~.t ..1 /- ~.~t '~ .~h~~xvs a ci,14s .~eClll ivi ,~1 I I-It+ w l n d l n I, illld ~.'~lll ~.a,,,{' T'hc Ihlcl~m">4 ,,I lile case IS ~,g-7'~ mrll 'Tile c~lrrler piirl ,)i Ih,' qllilVr lilieS, whL'rL' IllL' n i a ~ l r i i u m %lfe4t, ,)1 71)1) M [ J j W~,LihJ a p p e a r dl.lrllil# ,werh~,.id It., a ,tilL'-plt','e ",llilliie44 4k'el h l r v i n V ]-'he Ill41de ,11 Ihl4 ~.'llrrler pleWe 14 LIII%'I~,J Ii1 Illre, ~ ~.,laL.,e4,~1 d l l l e r e n l r a d i i hi av~Hd c~ce.~41vc .d i e,.~, ~., Inc i.'nl i l l l l U n 'The WIlldlli+~ I!., C, Hlip, P,¢d ,,I 2lt d,,uble pailt.'al,.e:, arr;in[;,cd a,~ 4 h , l w n in F}g S, a n d Ihe h d a l nurrlbc'r ,ll'liJrri.~

i;.,~-~4g B e l w e e n l h l , , w l n d , n g a n d l h e i n u e r s u r l ' a c e , ~ l l h e c(,I va;,e. ,ire F R P ( Fiber R~.',nhm.'ed Pla.~llCl 4pa¢.'ers and in~ulah~r,, There ale Ihrec klnd;~ ,)1 ,~pacer.',,. Ihwkness

Ihc

deslLIm

h~r Ihe

aclual

c(m.,~lrucll(m

,~1 a h.lrp, c

~tiperc, mduclm)] l',llI. Ihe vahdll~' ,ll any analysis .4hiiuld he checked Slrlcllv. T'herehlre. In a d d l l l i m hi design analysis. J A E R I carried ,)tll v e r l h c a l l l m lesl.~ I(i examine Ihe dala ha,+e and Ihe vahdd~' ol'lhe analysis When JAE,'.RI slarled Ihe design w, lrk. there wa~ IiIIle dala especially un mulerial slren~lh al 4 K. JAF'.RI measured arid evalualed malellal dala a14 K hlr deveh)prrlenl ,d Ihe Japanese L.L"T cc.l ~ , t n l e l ~ l l h e l n ; l l , ~ r anal%sesand veriIicali(,rileslsare de.~crlhed hehlw

Stress analysts and verthcat#'on I A E R I decld~.'d Ihc liflhlwin[.,. ~'rllerla h~r Ihe slruclLiral I~ased ,in A S M E (:,~de Secll(m III

desu}.n m a i n l y

I

marl, in ,~1 4alcl~' h~[ yield M l e n g l h is I '~ hit m~rmal m, lde and I() h,r iaull nltides marL.,in id ~alel~' hit b u c k l i n g IS '~.1). marL.,,in ,ll ;,alcl~' li~[ I'allgue is I()(I.

,-I

nlalerlal dala h~r Ihe ab, lx',' c~altlall(ins are bused on Ihe ITleaMIrc'd value4 al 4 K h~r eleclrilina.~.nelic hlrce. a n d al 1110 K liar I h e r m a l

slre4.~

.IAERI u4~..d Ihe c , . n p u l e r ~.,}de SAP V h~ perl
Cryogenics 1985 Vo125 May

22.9

Japanese LCT coil: S. Sh/mamoto et al. Table 3

The rnax=mum de~:,ign slr~ss ol I1"i~J-p~ne,,~ I.C[ cud CondlJCI u r

(A)

As a resull i~l Ihe sirens analysis, tl wa,~ required [hal Ihe yteld .'.,tren[;.th ,~1 Ihe slamnle;,.', .sleel Ior Ihe coil case

SI l l J(; I U t

,d,_~uld

Hnop slrH~..;,~, (MPa) 134 Slress inlerv..',ly(MPa) 190 (B)

215

All. B. corldll~url Hnop slrHss (MPd) '128 Slress inlHns~ty (MPa) 196

;?4 O

Stability

1

slren~.lh

(.)l'

analysis

and veHhcatlon

/-~g v" 'The measured propa~al,)n veloctry ~1 a normal z,)ne g.eneraled hy a healer wa.~ - 2 ni.s -~ al '7 'T'. I() k.~ sh~win~, surl',.',enl slab,I,W. T h e m u u m u m p r ~ p a g a l , u n eurrenl a! ~ 'T' wa.,.; measured h~ be 14 k,~ wh,ch was h.~her Ihan the value pred,cled by Ihe slahd,ry analys~.s T h i s dtlleren*.'e was assumed lu he due h) Ihe shorl leng, lh ()1 Ihe '[' zone ( ~(l *.'m) in Ihls *.'xpertmenl

on Inner Gurface(calculoled) -II 0 U (x= 0uJer Surface(calculated) PERCENT I'xperlmenlal value PERIM[ FER1100 0 _ .}L9 U O "E ,, on if,net !'.;u,1oce 8o ,.) E • =i Outer Surlace I~:~lt 7() (.)

'4

P, I "

hJ 0 b(') U ~; ! 4OO J ," ~ "ll i# ] , 30 O ,-~ ~ I t, / . '~ ;?O 0 (.t') " ~ :~ ,, _~ ,, , , : , , / \ ,~ ',4 ,: ,, \l ,.O~,, , 'Y~21 \ I l l .,,; ,~ . I 0 0 () 0 ~. ) 1 () 0 ~'J ~ ',_RE.. I

0

,1

O

p!

L)

',l /

"~

_

,

,.,~ '....,;,;

I

30 (:) ,."5 400 ~ re 5 0 0 ~bOO

• ""1 Verilicalion of Ihe slress analysis by a I / 4

size

mc~lel

E

I OOO

o.

,

,

,

,

s°

,4.-.i i

o

Q,)

o

q T R A N D " ' C WIRE FULL C O N O U C I O R COPPER

600 (t) u) LU 4 0 0 Ira 2 0 0

0

I

9

CL

O C,

-2 I

I

I

2 STRAIN (%)

~

1

Transport

Current (KA)

l l 12 1

14 15 16

I

I

~)/OI

/o

/

-1

O O. O t,,.,.

=,,-~'~'~'

I"' ,,,, "'

00

,

Rated Current ( 1 0 . 2 2 K A ) _ /

=.O .i

"~ 800

,

1

,,,

>

A B C

,

~J

;~oo

~, ,,, ;

12

,

i

,

4

Fig. 7 lesl

yiehJ

I-

~, tO 0 0 0

J

The

J A E R I carried ,)ul a one d l m e f l s l o n a l nunlerl*.'al ~lahilll~ analysis hased ,)n Ihc mea.sur¢d resLlll~ oJ Ileal Iransler Ir~m the ~.'(mdu¢l=~r surlace as a lun*.'llon ,)1' ~urlace m * . ' l i n a l . m Io Ihe verh*.'al. Ihe w l d l h and lenglh ~1 *.'ooh n~., *.'hannel and Ihe ma~,nel,m.-smlance ,~1 Ihe *.'(~pper sla bllJzer 'The re.suit.,, , n d l c a l e d Ihal Ihe pr~)pa~,al,m veh~¢tl3' was rie~.;;.ilwe up h~ a c o n d u c l ~ r ~.urrent o1' 12 7 I ~ h)r X 'T'. and 12 7 ~ h~r '~ T', c~mlirm,nLJ , sullt~.ienl slabtlil~' al Ihe m . n m a l uperalJnL., ~.l)ndtlJ,)ns i~l Ill 2 k.A and ~ 'P A l l e l Ihe *.',mduch~r labri~.'alum, a sJmulaU(m wmdtn~, (usm~.~. l u l l s t z e d c , m d u c h m 2X lurris, inner dlarnel*.'r = (~(X) mnL (~uler dtameler = IIXX) ram) was made and lesled al ~ 'T' up 1~ I'~ k.~ The re.sult.s are sh~,wn in

i12o o

() ol8 0 0 ~*~ ; 4 0 ¢/'1

71)l) MPa

706

corner par1 ~1' Ihe ¢c,I ~.'ase Re.sulls (~1 Ihe ,,,;ircss',, unal~,sts are .~h()wn tn 'T=zbh' t h.)r m~rmal o p e r a l , , m a n d a I'aull m o d e ( A . I L B C u n d i l , o n ) =n wh,ch a ne,~,hbour,ng elfil h)se.s ils eurrenL For e v a l u a l , m ()l'lhe slre~s analysis, J A E R I mud,.- a I/4 .',;tze m o d e l o f the cc, I cross .secl,,)n, a n d ' m e a s u r e d Ihe .',;Ire.',;.',;dJ',;Irihulton u n d e r the h~ad c o n d i l i u n ~1 AlL B m o d e as de,',;cribed ub, w¢ Re.,,;ull.,,; o f Ihe mea,,,;uremenl c(~rresp u n d e d well 11)Ihe a naly.,.;t.s as m d t e a l e d tn Ft~ 7, .'.;how=m2, Ihe validiry ol Ihe ,,,;,,;Ire,,,;.,,;analysl.,,; o1' the c(,I *.'a.s~ J A E R I als~ measured Ihe m e c h a n t c a l churaelen,,,;l~¢s o l Ihe c o n d u c t o r , whi~.'h is c o m p o s e d ~1' super conduclin~, slrands, .'.,=alder and copper sla['ulizer M e a s u r e d resulls at,-I K are sh<)wn tn FIg ,~' 'The measured y,eld slrent..,th ~1 Ihe Japanese L.L"T' conduch.~r =s 2q'~ M P , , w h i c h ~s , I'~ limes Ihe m a x m l u n l de.s~,n ```;ires,,, (Iq() M P a ) ~

,- L';J

be

.~laJnle.s;, qeel ~,(),-IL is u;,ually.~.4()() M P a al 4 K. s(~ nllrol?,en '.,Iren.p,lhet)int., wa.s required .IA~ERI surveyed Ihe slrent.q]) ~)1 slainles.s sleel '~11.4L.N al,4 K and rmally ,selecled ~ute wtlh ;J nH roL.,en *.'~mlenl (~11) I ~", wh<)se yield .Mreri[.~.lh IS 7()t)-N(I() M P a ~' F R P n l a l e r i a l s h~r ,,l~a,.'er ,, were als,, .'.,~-Iecled ha,.;ed (m Ihe le.sl dala al ,-i K ~

Nurrrial curidtliun

f

f

0

at 8 T

I

3

4

Fig. 8 4K

Tensile lest resulls ol Ihe Japanese LCT conduclo[ al

2.30

Cryogenics 1 9 8 5 Vol 25 May

-3

'

'

'

'

'

'

'

'

Fig. 9 Propagalic)n vuh')l:ily measur~J by a lull sized slmulaliun winding

Japanese LCT coil: S. Shomamoto el al. Loss analysis and venhcat/on :~ LI,."T t,~11:,, have heen dc~t'h,ped hu IhK' ~'llliMrLic'll(m ~I

h~r¢udal oul'., 'T'l)rl,ndal c, ul.~ are (,l~erLIIt.'d hv d ~. clJrrenL bEll Ill I h r I'~&aun;.=l,. Iml,,t'd rwh.l,, Irlm1[ p~fl~n~lal r~ul,, art' a p p l i e d h~ hm_mJal clul,.,, a n d Ihev ,dl~uhJ Iw du,,tl.Jncll ,.,1~ Ihal II1c~ carl Iw ,~perulcd ,~lahly wnlh h:w h),,l,, u n d e r Ih[u, c, mdill~)n F'~r Ihi;,, pLJrl,l~e ;.Irl e x p r r i n l c n l (,n pLIl,,rd I'teld ellet'l,,, ~,~'tlI,, Illi nuded II1 I1-11' L(.'T r,r~gramn1[u In Ihc de!,,nl;rl ,:1 Ille hJpnne'.,e L(.'f' ~ m d u ~ h ~ r a,,, dt',,trnhcd hchm:, ,~l)llll' i1[It'lh()dh hi rt'duL'c IHJIhL' Ii1~,,,,,~'~, were" enllfl~,vcd a n d h~,.,,., ,~l~alv,,n,, h,r ,J Inul, c ,,Iranld I,m'k wa,, d~:~eh q w d I-~)r I h r v e r t l n c a l l l m ~,1 IIi1.,., analv,~r.,. IAE RI iI1[t'al.,u rt'd Ih[c i,~nl,.,cd InehJ hm,, (~1 a ',,Irarld a n d ;.I l'~;It, k ~11"~ :,(fldered Mr;ind,, 111 ;I pul,~,ed IlrhJ IJp I(, 2"~ 'T ,,-' tt,_tr /0 p o n d c n t ' ¢ J-~el',~t'ellZlIILIl$'%I% ;11](t mc;j.,qJrCiTlerll W,l~,, t'~)n r i r m e d By Ihl,., an;Jl~,,i,,. Ihe h)lal pul,,ed Ii)~.,I., ~1 L.(."T wlndl1[l~] irl I h r ,,peeulled pLii,.,ed I iehJ ( m a x ()1,4 T'.; -I) i", c a l e u l a l e d h: he i.) W Retzardiil)., e d d v h.~,,.,,el., 1111Ihe ~,lannle~,, ~,leei t'a,~e I A [ R I 11eveh~pc~l a o m I p u l e r ~.'~lJe I-'L)I ) " I ' A R B T . ~ l l , . ' h ~m., ;~ppIl('d i{~ a I]nlile eh'rncnll tlll)d¢l T h e resLIII ~1 Ihc t a h . ' u l a l l l ) n ~,~.;i,., l() W h~r I h r ;.,a1[nr cl)1[idlll~m dc,.,Cllt~ed ;10~11%('

In Ih[t' de',,ngTI ()1 Ihr lal>aX1[,'.,,e L C T t~)il, Ihe m a x t m i i r n l ~,~flhq.,e nn Ihe ca,,t' ~1 I.,~,,,I d l , , r l l a r g e i,,, I kV, ir'.,ullnn[!.., 111[an c x i e r n a l le'~n',,l,.int'e ~111 I f ! a n d a dl~char~.,,r IlnlU C()II;,I,.L1[II i11 2(i ,, T h e qLicn~.'h {Jt'lt't'111111 t o [ i d l l l l l n al (_)RNL I,., rehllnvt'lv hiL.',h. ~() niV lur , ", ',, hul Ihe nl;ixnrnunll l e n l p e r a l t l r e 111 lhe wtndlrl[., ,~1 lhe lapane.~t' I ( 'I t.(H] I,, ~",llnlilh'(J Ii) I~t" ' (~() I~. t'~t'll in Ihe t'a,,c ,,1 Im,I dn',,t har!?e IJrlde[ I h r C{HIdlIll)II de,,cril~rd abe,re

Cool-down and warm-up (',)1_11 d~)~',ll ~,1 ,I hlrL.,(' '.,llpt'r{'()n(JlJ~.'llnl.~ ~I~II I;., aL'Jlle%t~d I-,v ]{~rlL., ieirll ~'llllIInllq_iLl% t)l'leraJt(irl iii C~q)!2,elllL VLIL'I.IUn'I. Jlllt LtIIIIFIII "~,"d~,=llih T'Jlerehlre. L'IIIIi d11~1[I lit ;I larL.',e ~'()ll I,% MHT1[t'IlriIC% ill(irt' li'TipqlFl:i111 ;Jfld dtlrn.,uli ii;;]rl elet'iric ch;.Jr!~nnL~ Ih[e t'~uJ i A F ' R I Ln,~ed ;I c l m i p u l t ' r code, 'T'RI.IMF ) i,)r IJle ;inalv,.,r., (~i ~.'i~_~1d(~wn 'T'i1[~.' re',,uii,,, l r l d l e a l e d iJlal ,.-H ~: .% n Jlelli.ln[t Ihm, dp,'idrd iltlq) Wtl|dlll[2. ;11[id MIUCILIrL' t.'lll)]lllJ2 lupe ,, ~',.111~'(:1~1 (JltwII Ihe cull I111 I 2() Jl wilhllul "1111[~ e~ce,;:,lVe I h e r n l a l ,,Ire,',.,., Verd'lCall(m ,,I c(.fl d~w!n aulalysl,~ 1;, p,e1[leral[~' dilrlt'U]l h[i,we~er I A E R I t'~uld d e h ' r m m e ellet'll~e e l l l ¢ i e r l c y (:I r~.)lnng h ( ' l w e r n Ilelntu1[n I-'a", a n d ¢~ul ha;,ed i)n c ( . d d~w¢1[i expernenee,,~ ()1 Ihe I'~ I(m ChJ',,ler Te,,,I (.'~ul,.?

Fabrication of the Japanese LCT coil

Coil protection T'llr Ii)lai ,.,h ~rrd ¢11erI:%, 1,1 a 'T(~kanlak I~lr(udal ~.'~:11'-,y',,Ir nl I!, n l ( ) r e l h a n ;t lew l e n s o l (J.I I h e r e h ~ r e l t l ¢ pr(flevlU_lnl,I Ihe ~.'~11%'slem I.% ~)111~" ()1 Ih[e m~v.,I n l n l ~ , r l a i l l purls ,~I I11~: l e c t l r , fl,~b~' h) ht:' dc~,ehipt'd A .'.,ix L(.'T c(tll arra~ has a ,4ored e n e r g y ~1 IIJM u n d e r I ( i l a n d 11 1~ a gll(Id '.,~,.'.,lem h~r Ihe verlllt'all~m (>1 Ihl~; lechll(d~)g~

]-'he lechm_lhlL.,ncal requirenlerll.~ c~l Ihe Japune~,e L,C'T o)ndu¢t~,r lar e x c e e d e d Ihr level i~I lechru4(~gy a v a i l a b l e al Ihe Ilnle i11 la.~k i r l i l i a l t ( m . ~,~ nlLIrly Irlai.~ a n d error.~ had Io i-,e expernenced behm.' the c~)rlducl(~r i u b r l c a l i ( i n pnlces,~ wa.,, eslahln,~hed as shown nn t'tg II The Iirsl rlr(lt~len~ w,..l~, Ihe e n llca l t'tirTe1[ll de1111%11%'~11 Nb-'Tn a v a i l a b l e nn[ l a p a n AI Ihe hel.,nn1111tng~fl ltle L,(."]- p r ~ g r a m r n e J A E R I Japanese

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Mex Magnetic Field, Bo (T) Fig 10 PlJl'=;e'd InPid lu,-,h ~ h,Jrd1"lernsllq;S rnedsur~d IE)V a slrdriq'l ,-irl(-I ,:1 ',lrdnd pd{.I,, wl-nnr.h u~, {.'~)rrq:,),jHd ul I 5 ~;uhtl-red ,~lrarll'l~,

(Juolutv (;erllrul Fig. 1 1

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F,.Ibrl1:dlnurl l:m H:e,.,:., h Jr IP,-, Japan.,.e LC"T 1:q:rlf'JtJ1:lot

Cryogenics '1985 V o 1 2 5 May

2.31

Japanese LCT coil." S. Shimamoto el al. ,(,Onltoller

~,

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measured Ihe crHical currenl denstty ()1 all condtk'h)rs avaduhle rmm Japanese cable induslr~es ~n IqTN. 'The resulls shuwed Ihe.Japanese dala h~ be I/~i - 2/~ of lurelgn values. JAF,RI made Ihe dala ava,lable h~ all Ihe c()rnparues parltctpalm/..,, tn the pr~Hecl and Ihe deveh~pmenls lu increase Ihe qual,ty ~I superconduclors were ,n,ltaled Two years laler, the crH~cal currenl denstry level was duuhled and lurlher elhm.~ rolh~wed. Nuw Ihe h,~h quah~ ul supere~mducltnl..,, cables Irum .Japan ts well underslo~d worldwtde. 'The Japanese L.CT c(mduch~r develupmenl depended ~n many lechnuhq~tc~s tncludlng, conduch.)r surlace IreatmenL slrandtng, cumpa~ItnL., and s(ddertng In the tntltal des~.~.n, lhe slrand pack wax nul lucaled al lhe centre ,~I lhe cupper slabtltzer The verd~cau,m lesl ol lhe wmdtn~ sh=~wed exlrust~m ,~I slrands ir~Hn Iheedge~d'lhe C(HIduch)[ by creep aller a day or rw~. 'T'ht.~ problem wax Itnally salved hy sh,lllng Ihe strand pack I,) the cenlre ~1 Ihe c,mduclor as .q=own m The Japanese LCT c()nduch)r was wound In a D shape by lhe wtndmgsyslem as shown tn/'L~ I~ As Ihe c,)nducl(~r wtlh Ihecn)sssect,)n u f l 2 h , 2t~N mm, wa.~ edge-wise w()und, Ihts w,~rk was called li.)rmln~ ralher Ihan winding 'Thts h.~rrntnL.,, wax done by u,smg many over bendtng louis c~rre.~pundtn~?, h~ Ihe h~cal radH (~1 the D shape The tulerance ul the inler-lLirn ~,ap was ILl mrrL Iherefore h,gh quality w~rk was requ,red This wax achteved hv slall wh¢~ lully undersl(,.~d Ihe sly,nil]canoe and dllhculty ol tills w~)rk '')''' In Ihts way, 20 d~uhle pancakes were made, slacked and I'mally mserled mlo Ihe curl ease F'(~r I'HIm.~, Ihe windin~,s in Ihe case, Ihe case wax healed up h~ :-~:O()"C, then wedges were .n.~erlecL Io ~,el a Ihermal shrink I~L The side plale ul' the c~).l case wax compressed ohio Ihe wind,ng by a pressure ul :.'~:~,l)() hms and h~)lls were rtxed. The Japanese L,C"T' c~)il c(~mpleled tn lilts way i,s shuwn in F~ I ¢ '~

""

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lac;thly lur the J a p a n e s e

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tesl laelldv su Ihut any pn)hlem,~ would nol dmturb Ihe tesling ()1 Ihe superc~mduchnp, c~)d under develupment In tile design and c(mstrucli~m ~)l lhe Japanese LC'T' cu,l, JAERI carried uut all lhe experimenls and analyses p~sslhle and lhese resulls were Iransm,tted h.l the rTianulaclurer and rellecled tn lhe c~mslrucl,~m ()I lhe c~)tl Pr,~pc~sals Ir(~rrl Ihe mantll'acturer were als(~ examined Ih~r~)u~,.,.hly hy JAF'RI and dectst~ms were made by deladed dlscuss.~ms between .IAERI and Ihe manu laclurer. 'T'h,s way ~)1 diredtng Ihe develupmenl haw prayed tls value as Ihe Japanese LCT' c~d was Ihe hrsl h~ be Iintshed and the c~fil salmlied tile LC"T' sl~ectlicalt(ms wHh sull'tc,enl maq:;,n tn Ihe d~mlesltc lesl al JAERI In Ih,s way, the L.arg.e (.'~tl Task has g.really =mpr~wed Japanese lechnlthlL..W hlwards Ihe conslruclilln ill'a larg,e supercunduclinl.~ 'Tukaniak inachine

Acknowledgements 'The aulhur.~ w~)uld I=ke h)Ihank Drs ~ M(~r,. 't' Is4~and Y C)hala h~r Iheir cunlmumg enc,)ura[.,.emenl ~n Ihls

Concluding remarks II wax an ambtltous pm.leCl h~r Japan h~ sign Ihe LC'T agreemenl m Iq'7~. Io develop and c~mslruel Ihc Japanese L.(."'T'~',~L lu lesl it in Ihc domestic lesl I'ac~l~ty. and Io hrt nl:; II [0 Ihe LJIIIled ~lales fur Ihe tnlernalu)nal exper.menL In Ihose days. u 24 cm hare ~ 'T' magnel wax al the li)relr~ml ~1 hlgh-rteld superc~nductm~, ma~nel lechnoh~t.,~' 'The requirements ~d' L(?'T'c~HI.~. such as lar~,e operulmgcurrenl (1(I-I~ kA), D-shaped w,nd,ng, and h~ph slress~m wtndtn~ and cotl came, lar exceeded Ihe level ul'extMtng lech mfl~.W al thai Imle C~mslderahle erhm wa.~ requtred tn Ihe con.,.;Irucll~m ul Ihe domesltc tesl I'ac,lil~. am well as h)r Ihe LC'T c~,l .JAE.RI deveh)ped a large helmrn hqt, erwr/ relrlgerulor, u c~)rr,puler .syMem h~r dala uequ,siltcm and auh)matlc c, mlrol ,~1 Ihe cryogenic syslem, a high ~.'tirrenl rippleless p(~wer supply and cod prc.~le~.'li~)ll sy~lem li)r lhe lesl lactl.ty .JAE'.RI made much ol Ihe c~mpleteness ~11he

232

Cryogemcs 1985 Vol 25 May

F,g. 13 Comple.led JapanP.!;~ LCT cq,I

Japanese

2 ~J.Llld;Jnee (.'()nlrlbullt);]~ in Ih¢ ~'{)n¢'epltlLll d¢,,l~..~n pha.~e Ir~)m'T'~)~hlhaLId M i l ~ u h l n h l E l e ¢ . F u r u k a w a E l e c , a n d Sht~wa IJahl¢ and Wire Ct~ and Sumlh.)mo Ele¢ and manulaclurl;ff., c o n l r l b u l . m ~ Ir()m H,lachl Lid and Hilaehl Cable C'o arc ~..,,ralelullv aeknowledgecL The aulh~r,, w~)uid like h~ thank I-)r~, Y Sanada ('T~).~hlha (.'()lp) al~d M ~hlmada (Kohc Sleel) h~[ Ihelr conlnhull~,~.~ a;, ~'l~llll]~. ~'lenlt~l~ I~ JAERI

References I

Nl~hl~ NI ~'l ,d I•/-t

[~,m~ ,~l, tl~. (I~NI) N I A ( ; ' I 7 . ~(14

; ,4

LCT coil" S. Shtmamoto

el al.

Yoshtda, K ~'r,/ I t l l I t m t , . i l , . t t , ( I q * } ' . l l M A ( . ; - I ? ~-II~ ['suJI, H ,'t ,d II t t 1-t..~ ,~hJ,t:. (I~NI) M A G - I'/ 4 .~ S h i m a m o l o , N. t't rl/ ['rol' ?{tit ~'111tlP t~tl ~ tl,t~,llh'l'tttl,[{ PtrJh/r'ltt~ o/ tli~l{tll R{'~t'lttl II (1{)?{4) I I 7'4

'~ Yoshida,k. t't u/ 4d~ { tr,~: t,.1~ {1'~;;) Z87Xl 'l'akahashL, Y ,'t,d ,hid 7

h 7

{) I() II

I?

Km~uml, K, t,r I.sl dmt 22 S h l m a m o l o , ,%.' r,i rJ/ Pr.f ~#h .-~vmp . . ~ . g m r c . . , ~ ; Pmhh'm,~ o~ t . ~ . m R r ~ ' r m h (I~4NI) 2qll ~') Ando, '[' ,'t rJI It 1 t Tr,m~ ,~l~.i,l~tt (19##) M A G - 15 t,; b h l m a m o l o , S ,,t~J/ I t t t I - h m ~ , 1 h ~ t . { l ~ 4 N I ) M A G - 1 7 17;,4 Shlmamolo, N. ,'l ~1 [5~c I¢ t ( U Bulh'rx~rlh,,,, (_,utldlo[d IlK (1~8.~) ,4 ;~ S h i m a m o t o , S. ,'/ ,zl II / ' t I tllll~ ,~tl.l,:tl {1{4N;~I MAI;-Iq N'~I

Cryogenics

1985

Vo125

May

233