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>
HAL Id: jpa-00223683
https://hal.archives-ouvertes.fr/jpa-00223683
Submitted on 1 Jan 1984
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JOURNAL DE PHYSIQUE
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 - 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 supracond 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'assemblage).
A b s t r a c t - The e x p e r i e n c e s gained 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 demonstration of r e l i a b l e o p e r a t i o n of
l a r g e superconducting f u s i o n magnet systems a r e t h e o b j e c t i v e s of t h i s p r o j e c t . According 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
-
COIL W I N D I N G
The winding technique / 2 / , a p p l y i n g continuous 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
conductors / 3 / i n hand, proved t o be s u c c e s s f u l . The two-conductor procedure 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.
Other p o i n t s of s p e c i a l e f f o r t s were:
- 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 conductor 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 upper 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 of each conductor,
through a l l s t a g e s o f t h e winding and impregnation p r o c e s s ,
- 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 of 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, enforced by t h e impregnation mould i n which t h e pancakes were
stacked ( 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 conductor) 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 achieve 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 :
- 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 of 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 elements l i k e c u r r e n t l e a d s , j o i n t headers e t c . p r o p e r l y placed 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
-
COIL CASE
Each 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 (corresponding 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 , but 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 of t h e
forged f r o n t p i e c e . About 600 b o r e s f o r plug 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 . - 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 gC 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
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JOURNAL DE PHYSIQUE
correct within
6
a s planned,
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 of
flaws 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 channels 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 technique,
t h e D shape 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 geometry c o n t r o l .
I11
-
ASSEMBLY
R e f e r r i n g t o t h e major 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 advantages 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 bladd e r s w i t h f i l l e d epoxy r e s i n a r e :
- r a t h e r uniform 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 tol 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 range 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 time and good c o n t r o l of procedure.
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 achieved 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 moderately
t o r q u i n g , and by checking t h e l e n g t h of about 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 , tube-connections, f e e d throughs 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 welding 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 about 10-8 mbar l / s p e r item, 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 leakage of t h e complete magnet must n o t exceed 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 , accompanying 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.
IV
-
CONCLUSION
So f a r , manufacturing of 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, mainly 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 " phases 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 could 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 cryogenic 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 of 1983.
REFERENCES
/ I / HAUBENREICH P.N. e t a l . , Fusion Technology 1982 (Proc. 12th SOFT) Vo1.2,
pp. 1027-1032, Pergamon P r e s s .
/2/ KRAUTH H . e t a l . , Proc. 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 . , Proc. 8 t h S p p . Eng. P r o b l . Fus. ?es., San F r a n c i s c o , S e p t . 79,
Vol. 111, pp. 1451-1455, IEEE Publ. No 79 CH 1441-5 NPS.
/4/ HACKER H. e t a l . , t o be publ.: Proc. 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 Verlag, 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 of 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 .
Fig. 1 - Top a r e a of t h e
zompleted winding pack with
the seven double pancakes
stacked i n t h e (not y e t comp l e t e l y assembled) impregn a t i o n mould. The two conductor ends of t h e c o i l and
t h e 13 o u t l e t headers housi n g t h e conductor s e r i e s
connections can be seen a s
prepared f o r l e a k t e s t i n g .
Fig. 2 - Top view of t h e impregnated winding pack (aft e r removing of t h e mould),
showing i n t h e c o i l upper
area: conductor ends, 13
v o l t a g e t a p connections,
and helium o u t l e t headers.
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
with voltage separators
and expansion bellows dur 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)
.
Fig. 4 - One of t h e two
symmetrical halves of t h e
s t a i n l e s s s t e e l c o i l case
with winding c a v i t y during
dimensional c o n t r o l (court e s y : KRUPP).
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JOURNAL DE PHYSIQUE
Fig. 5 - 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
bladders with t h e 7 cutouts 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.
Fig. 6 - Second h a l f of
t h e c o i l case (with preassembled s s b l a d d e r s ) bei n g lowered onto t h e f i r s t
h a l f of the c o i l case with
t h e winding already f i x e d
i n the l a t t e r .
Fig. 7 - A f t e r temporary
b o l t i n g of t h e c o i l case
with f e r r i t i c b o l t s the
bladders of t h e second
h a l f a r e i n f l a t e d successi v e l y by epoxy r e s i n .
Fig. 8 - Inner r i n g of the
c o i l case with cooling
channels a f t e r applying
t h e s s b o l t s . Cover s h e e t s
a r e s e a l welded i n t h e
flange bolting area to
provide a guard vacuum
i n s i d e t h e c o i l case
(courtesy: KRUPP)
.