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STABILITY TEST RESULT OF THE JAPANESE TEST COIL FOR THE LARGE COIL TASK AT THE
DOMESTIC TEST
M. Nishi, T. Ando, T. Hiyama, H. Tsuji, Y. Takahashi, K. Okuno, K.
Yoshida, E. Tada, K. Koizumi, T. Kato, et al.
To cite this version:
M. Nishi, T. Ando, T. Hiyama, H. Tsuji, Y. Takahashi, et al.. STABILITY TEST RESULT OF THE
JAPANESE TEST COIL FOR THE LARGE COIL TASK AT THE DOMESTIC TEST. Journal de
Physique Colloques, 1984, 45 (C1), pp.C1-131-C1-134. �10.1051/jphyscol:1984128�. �jpa-00223683�
Colloque C I , supplCment a u n o 1, Tome 45, janvier 1984 page C1-135
MANUFACTURING EXPERIENCE W I T H T H E EUROPEAN SUPERCONDUCTING C O I L FOR THE LARGE COIL TASK (LCT)
C . A l b r e c h t , H . S a l z b u r g e r , H . ~ r a u t h * , A. ~ l b r i c h t * and A . ~ ~ i l a s * Siemens ForschungsZaboratorien, 8520 ErZangen, F.R.G.
*~ernforschun~szentrwn Karlsruhe ( K f l i l , Inst. Tech. Phys., 7500 KarZsmthe, F. R. G.
RQsumC
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L 1 e x p & r i e n c e a c q u i s e pendant l a f a b r i c a t i o n d e l ' a i m a n t supracon- d u c t e u r Europgen pour LCT e s t d Q c r i t e ( f a b r i c a t i o n d e l a bobine,de l a s t r u c t u r e d ' a c i e r e t d e l ' a s s e m b l a g e ) .A b s t r a c t
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The e x p e r i e n c e s g a i n e d d u r i n g f a b r i c a t i o n o f winding pack and s t e e l c a s e of t h e European LCT c o i l and d u r i n g i t s assembly a r e d e s c r i b e d .The European LCT c o i l i s a c o n t r i b u t i o n from t h e a s s o c i a t i o n EURATOMfKfK t o t h e
"Large C o i l Task" conducted under a n IEA agreement / I / . A p p l i c a t i o n of i n d u s t r i a l d e s i g n and f a b r i c a t i o n methods a s w e l l a s d e m o n s t r a t i o n of r e l i a b l e o p e r a t i o n of l a r g e s u p e r c o n d u c t i n g f u s i o n magnet systems a r e t h e o b j e c t i v e s o f t h i s p r o j e c t . Ac- c o r d i n g t o t h e d e s i g n , c o i l winding (SIEMENS) and c o i l c a s e (KRUPP) were manufactured i n p a r a l l e l and were t h e n assembled t o g e t h e r w i t h t h e o t h e r s u b c o m ~ o n e n t s (SIEMENS).
I
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COIL W I N D I N GThe winding t e c h n i q u e / 2 / , a p p l y i n g c o n t i n u o u s e l e c t r o l y t i c a l c l e a n i n g , 3 l a y e r wrapping w i t h d r y g l a s s t a p e and 50 r e s p . 10 kN winding t e n s i o n t o t h e two hollow c o n d u c t o r s / 3 / i n hand, proved t o be s u c c e s s f u l . The two-conductor p r o c e d u r e allowed f o r e a s y c o n t r o l of l a y e r - t o - l a y e r i n s u l a t i o n (1 kV) d u r i n q winding.
O t h e r p o i n t s o f s p e c i a l e f f o r t s were:
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t o o l s and q u a l i t y c o n t r o l f o r bending t h e c o n d u c t o r t h e h a r d way w i t h o u t i n t e r n a l o v e r s t r e s s i n g ( t r a n s i t i o n lower t o u p p e r p i e ) ,- l e a k t e s t i n g i n c l u d i n g t h e He i n l e t c a p s u l e s , welded h a l f way o f each c o n d u c t o r , through a l l s t a g e s o f t h e w i n d i n g and i m p r e g n a t i o n p r o c e s s ,
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r a d i a l dimensions, f l a t n e s s and mechanical l o a d on d r y i n s u l a t i o n d u r i n g t h e r e - l e a s e o f each double pancake from t h e "odd" D-contour of t h e c o i l former t o t h e f i n a l c o r r e c t shape, e n f o r c e d by t h e i m p r e g n a t i o n mould i n which t h e pancakes were s t a c k e d ( f i g . 1 ) .The complete s t a c k of 7 double pancakes (588 t u r n s , 6.5 km of 1 1 kA c o n d u c t o r ) was s u c c e s s f u l l y impregnated w i t h epoxy r e s i n 141, s o a s t o a c h i e v e a s t i f f , m o n o l i t h i c b l o c k ( f i g . 2 ) . Main r e s u l t s :
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c o r r e c t geometry w i t h i n t o l e r a n c e s of +. 2,-
1 m,-
good q u a l i t y o f s u r f a c e ; s u c c e s s f u l 12 kV t e s t (DC, Paschen minimum),-
a l l i n t e r f a c e e l e m e n t s l i k e c u r r e n t l e a d s , j o i n t h e a d e r s e t c . p r o p e r l y p l a c e d and embedded ( f i g . 2, 3 ) ,-
18 t t o t a l weight of winding b l o c k , w i t h 580 kg epoxy r e s i n and 800 kg g l a s s f a - b r i c and f i l l e r b e i n g a p p l i e d .I1
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COIL CASEEach h a l f of t h e c o i l c a s e ( f i g . 4 ) i s welded up / 5 / from t h i c k s t a i n l e s s s t e e l ( s s ) m a t e r i a l t y p e 1.4429 ( c o r r e s p o n d i n g t o 316 LN). Plachining was a p p l i e d t o a l l f l a n g e s and t o t h e r e f e r e n c e p l a n e s , b u t n o t t o t h e i n n e r s u r f a c e s , e x c e p t t o t h o s e o f t h e f o r g e d f r o n t p i e c e . About 600 b o r e s f o r p l u g b o l t s and i n s t r u m e n t s had t o be d r i l l e d .
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Major r e s u l t s :-
s p e c i f i e d i n t e r f a c e dimension t o l e r a n c e s a r e s a t i s f i e d , ~ n d i n g C R T I Y o m e t r y i s ~ ~ ~Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1984128
CI-136 JOURNAL DE PHYSIQUE
c o r r e c t w i t h i n 6 a s planned,
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good q u a l i t y of heavy weld seams, no major r e p a i r ,-
s u c c e s s f u l u l t r a s o n i c seam c o n t r o l i n t h e a u s t e n i t i c m a t e r i a l w i t h a r e s o l u t i o n o f f l a w s down t o 2 mm,-
f a b r i c a t i o n of c a s e c o o l i n g c h a n n e l s by blowing up f l a t s s s t r i p s welded t o t h e c a s e ( f i g . 8 ) proved t o be a r o b u s t , p r a c t i c a l t e c h n i q u e ,-
t h e D s h a p e i n t r o d u c e d c o n s i d e r a b l e e f f o r t s , e s p e c i a l l y f o r machining and f o r geo- m e t r y c o n t r o l .I11
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ASSEMBLYR e f e r r i n g t o t h e m a j o r assembly s t e p s o u t l i n e d i n f i g u r e s 5 t o 8 , f o r c e l o c k i n g of t h e winding and b o l t i n g of t h e l a r g e f l a n g e s s h a l l be commented on s h o r t l y . The main a d v a n t a g e s of f i x i n g t h e winding i n s i d e t h e c a s e by i n f l a t i n g 54 ss b l a d - d e r s w i t h f i l l e d epoxy r e s i n a r e :
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r a t h e r u n i f o r m f o r c e t r a n s m i s s i o n , w i t h uneven s u r f a c e of winding c a v i t y b e i n g t o - l e r a b l e and w i t h no problems r e g a r d i n g c u t o u t s ,-
wide a l l o w a b l e r a n g e of gaps t o b e c l o s e d (1.5 mm t o 15 mm), - s h o r t assembly t i m e and good c o n t r o l of p r o c e d u r e .Torque-"free" t e n s i o n i n g t o g e t h e r w i t h good c o n t r o l of t h e r e q u i r e d h i g h b o l t t e n s i o n were a c h i e v e d by warming t h e b o l t s up t o 280 O C p r i o r t o i n s e r t i n g and m o d e r a t e l y t o r q u i n g , and by c h e c k i n g t h e l e n g t h of a b o u t 10 % of t h e 480 b o l t s i n s i t u / 6 / . Some 500 s e n s o r mounting s o c k e t s , t u b e - c o n n e c t i o n s , f e e d t h r o u g h s and o t h e r s e a l s t o g e t h e r w i t h a b o u t 450 m of w e l d i n g seams ( c o o l i n g c h a n n e l s and l a r g e f l a n g e s e a l s , f i g . 8) have t o be He-leak-tight t o a b o u t 10-8 mbar l / s p e r i t e m , most of them exposed t o 25 b a r i n t e r n a l p r e s s u r e a t 4 K. The t o t a l l e a k a g e o f t h e complete magnet must n o t ex- ceed 5-10-6 mbar l / s . T h e r e f o r e l e a k t e s t i n g was a permanent and c o s t l y a c t i v i t y , ac- companying t h e f a b r i c a t i o n and i n t e g r a t i o n of t h e numerous subcomponents.
I V
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CONCLUSIONSo f a r , m a n u f a c t u r i n g o f t h e European LCT c o i l was s u c c e s s f u l , though more time t h a n planned was needed, m a i n l y f o r v e r i f i c a t i o n t e s t i n g , d u r i n g " l e a r n i n g " p h a s e s and f o r q u a l i t y c o n t r o l and i n s t r u m e n t a t i o n , s o t h a t much time c o u l d b e saved w i t h f u t u r e c o i l s . S t a r t o f t h e c r y o g e n i c t e s t s a t t h e KfK f a c i l i t y TOSKA i s i n view f o r t h e 4 t h q u a r t e r o f 1983.
REFERENCES
/ I / HAUBENREICH P.N. e t a l . , F u s i o n Technology 1982 (Proc. 1 2 t h SOFT) Vo1.2, pp. 1027-1032, Pergamon P r e s s .
/ 2 / KRAUTH H . e t a l . , P r o c . 9 t h Symp. Eng. P r o b l . Fus. Res., Chicago, Oct. 81, Vol. 2, pp. 2027-2030.
/ 3 / KRAUTH H. e t a l . , P r o c . 8 t h S p p . Eng. P r o b l . Fus. ? e s . , San F r a n c i s c o , S e p t . 79, Vol. 111, pp. 1451-1455, IEEE P u b l . No 79 CH 1441-5 NPS.
/4/ HACKER H. e t a l . , t o be publ.: P r o c . I C M C , Aug. 83, Col. S p r i n g s ; Plenum Publ.
Corp., New York.
/ 5 / NYILAS A, KRAUTH H., Adv, Cryo. Eng. ( K a t e r i a l s ) 28, 1982, pp. 853 363.
/ 6 / LAUMANN W . , t o be p u b l i s h e d i n "Konstruktion", S p r i n g e r V e r l a g , e a r l y 1984.
ACKNOWLEDGEMENTS
The a u t h o r s a r e i n d e b t e d t o t h e numerous members o f t h e i r i n s t i t u t i o n s and of t h e o t h e r i n s t i t u t i o n s who c o n t r i b u t e d t o t h e p r o g r e s s of t h i s p r o j e c t .
zompleted winding pack w i t h the seven double pancakes s t a c k e d i n t h e ( n o t y e t com- p l e t e l y assembled) impreg- n a t i o n mould. The two con- d u c t o r ends of t h e c o i l and t h e 13 o u t l e t headers hous- i n g t h e conductor s e r i e s connections can b e seen a s prepared f o r l e a k t e s t i n g .
F i g . 2
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Top view of t h e im- pregnated winding pack ( a f - t e r removing of t h e mould), showing i n t h e c o i l upper a r e a : conductor ends, 13 v o l t a g e t a p connections, and helium o u t l e t h e a d e r s .F i g . 3 - He-inlet tubes f o r t h e p a r a l l e l channels of one s i d e of t h e winding pack w i t h v o l t a g e s e p a r a t o r s
and expansion bellows du- r i n g a p p l i c a t i o n of t h e
12 kV ground i n s u l a t i o n (shrinkage hoses and wet winding of f i b e r g l a s s - epoxy)
.
F i g . 4
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One of t h e two symmetrical h a l v e s of t h e s t a i n l e s s s t e e l c o i l case w i t h winding c a v i t y during dimensional c o n t r o l (cour- t e s y : KRUPP).C1-138 JOURNAL
DE
PHYSIQUEFig. 5
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View i n t o t h e winding c a v i t y of t h e c o i l case showing preassembled empty s t a i n l e s s s t e e l b l a d d e r s w i t h t h e 7 c u t - o u t s f o r t h e helium i n l e t s t o t h e a d j a c e n t h a l f of t h e c o i l winding.F i g . 6 - Second h a l f of t h e c o i l c a s e (with pre- assembled s s b l a d d e r s ) be- i n g lowered onto t h e f i r s t h a l f of t h e c o i l case w i t h t h e winding a l r e a d y f i x e d i n t h e l a t t e r .
Fig. 7
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A f t e r temporary b o l t i n g of t h e c o i l c a s e w i t h f e r r i t i c b o l t s t h e b l a d d e r s of t h e second h a l f a r e i n f l a t e d success- i v e l y by epoxy r e s i n .F i g . 8
