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Submitted on 1 Jan 1984
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MANUFACTURING EXPERIENCE WITH THE EUROPEAN SUPERCONDUCTING COIL FOR THE
LARGE COIL TASK (LCT)
C. Albrecht, H. Salzburger, H. Krauth, A. Ulbricht, A. Nyilas
To cite this version:
C. Albrecht, H. Salzburger, H. Krauth, A. Ulbricht, A. Nyilas. MANUFACTURING EXPERIENCE WITH THE EUROPEAN SUPERCONDUCTING COIL FOR THE LARGE COIL TASK (LCT).
Journal de Physique Colloques, 1984, 45 (C1), pp.C1-135-C1-138. �10.1051/jphyscol:1984129�. �jpa-
00223684�
JOURNAL DE PHYSIQUE
Colloque C1, supplgment a u n o 1, Tome 45, janvier 1984 page Cl-139
STATUS REPORT ON THE S W I S S L C T - C O I L
J.A. Z i c h y , B. J a k o b , C . M a r i n u c c i , J . Z e l l w e g e r , G. VQcsey,
H.
~ e n z ' , R.K. Maix* and J . RauchrSIN, Swiss I n s t i t u t e for Nuclear Research, CH-5234 VtZZigen, Switzerland
'BBC,
Brown, Boveri & Go. Ltd., Dept. ISM, CH-8050 Ziirich, Switzerland~ k s u m 6
-
La c o n t r i b u t i o n de l a S u i s s e au p r o j e t LCT c o n s i s t e e n une bobine--
s u p r a c o n d u c t r i c e de 8 Tes l a f a b r i q u 6 e e n NbTi r e f r o i d i e p a r c i r c u l a t i o n f o r c g e d ' h L l i u m s u p e r c r i t i q u e . La f a b r i c a t i o n de c e t t e b o b i n e e st
p r e s q u e termine'e.Le r a p p o r t p r 6 s e n t e q u e l q u e s c a l c u l s d6f i n i t i f s , l l e x p e / r i e n c e a c q u i s e s u r l a f a b r i c a t i o n du c o n d u c t e u r e t de l a b o b i n e , e t p o r t e s u r l e c h o i x d e l ' i n s t r u m e n t a t i o n e t s u r l e s r & s u l t a t s du t e s t d e s amenges d e c o u r a n t .
A b s t r a c t
-
The S w i s s c o n t r i b u t i o n t o t h e Large C o i l Task (LCT)i s
a NbTiP.
b a s e d 8 T c o i l c o o l e d by p r e s s u r i s e d s u p e r c r i t i c a l h e l i u m i n f o r c e d flow mode.
I t s f a b r i c a t i o n n e a r s c o m p l e t i o n . T h i s p r o g r e s s r e p o r t r e v i e w s some f i n a l c a l c u l a t i o n s , t h e e x p e r i e n c e on c o n d u c t o r and c o i l f a b r i c a t i o n a s w e l l a s t h e i n s t r u m e n t a t i o n f o r e s e e n and t h e r e s u l t s of t h e c u r r e n t l e a d t e s t s .
1 . INTRODUCTION
S i n c e more t h a n a decade S I B has been engaged i n t h e development and 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 (SC) magnets i n a j o i n t a c t i o n w i t h t h e d o m e s t i c i n d u s t q r e p r e s e n t e d e s p e c i a l l y by BBC. Baaed on t h i s e x p e r i e n c e , we d e c i d e d t o c o o l t h e c o i l w i t h p r e s s u r i z e d s u p e r c r i t i c a l h e l i u m i n f o r c e d f l o w mode / 1 , 2 , 3 / . T h i s approach h a s t h e a d v a n t a g e , t h a t t h e c o o l i n g medium i s e n t i r e l y c o n f i n e d i n t h e c o n d u c t o r .
I t
h a s f u r t h e r m e r i t s by c r e a t i n g a l l e v i a t i o n s e a s i l y e x p l o i t e d i n t h e d e s l g n o f t h e c o i l , namely:1 . The v a c u u m t i g h t n e s s of t h e c o i l c a s i n g i s no i m p e r a t i v e r e q u i r e m e n t anymore, t h e r e f o r e
i t
can be o p t i m i z e d t o w i t h s t a n d merely t h e s t r o n g f o r c e s a c t i n g .2 . The c a b l e i s i n t e r n a l l y c o o l e d , t h e r e f o r e ,
a
h i g h e l e c t r i c a l t u r n - t o - t u r n r e s i s t a n c e i s a c h i e v a b l e . T h i s enhances t h e h i g h v o l t a g e d i s c h a r g e c a p a b i l i t y of t h e c o i l and a s a consequence a h i g h e r c u r r e n t d e n s i t y c a b l e c a n be a p p l i e d .3 .
The u s e of p r e s s u r i s e d s u p e r c r i t i c a l h e l i u m a s c o o l i n g medium e x c l u d e s t h e p o s s i b i l i t y of f i l m b o i l i n g and v a p o r l o c k i n g , t h e r e f o r e t h e s t a b i l i t y of t h e c o i lis
c o m p l e t e l y p r e d i c t a b l e .2 . COIL C A S I N G
To c a r r y t h e m e c h a n i c a l l o a d a b o l t e d box-type s u p p o r t s t r u c t u r e h a s been s e l e c t e d
/4/.
The h o t r o l l e d p l a t e s and f o r g e d b l o c k s a r e made of 3 1 6 ~ / 3 1 6 L ~ t y p e s t a i n l e s s s t e e l . The c a s i n g is s u b d i v i d e d i n f o u r s u b a s s a m b l i e s , i n n e r a n d o u t e r r i n g , s l d e p l a t e s and c o n n e c t i o n box. The s t r a i g h t l e g of t h e D-shape h a s a key a s m a t l n g s u r f a c e t o t h e b u c k i n g p o s t of t h e Large C o i l T e s t F a c i l i t y (LCTF). A d d i t i o n a l m a t i n g s u r f a c e s on t h e t o p and bottom o f b o t h s i d e p l a t e s a r e f o r e s e e n t o s c o p e w i t h t h e o u t o f p l a n e f o r c e s . Copper t u b e s s o l d e r e d o n t o t h e i n n e r r i n g and t o b o t h s i d e p l a t e s w i l l be u s e d t o c o o l t h e c a s i n g i n d e p e n d e n t l y . The s t r u c t u r e h a s been assembled i n J u n e1983
f o r t h e f i r s t time.Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1984129
JOURNAL DE PHYSIQUE
3 .
CONDUCTORFABRI
CATlONA f t e r i n v e s t i g a t i n g t h r e e d i f f e r e n t c o n d u c t o r s t h e s o c a l l e d TUCO-cable h a s been chosen
/5/. I t s
m i c r o g r a p h i s shown i n F i g . 1.
I t is a f u l l y t r a n s p o s e d , c o p p e r s t a b i l i z e d t h r e e s t a g e c o n d u c t o r , f i l l e d w i t h h i g h s t r e n g t h CdZnAg s o l d e r . The p r e s s u r i s e d s u p e r c r i t i c a l h e l i u m f l o w s i n t h e c e n t r a l c o p p e r t u b e . To p r o v e t h e v a l i d i t y of t h i s c o n c e p t and t o d e v e l o p t h e f a b r i c a t i o n t e c h n o l o g y a s e r i e s of e v a l u a t i o n s t e p s were needed/6/.
The e s t i m a t i o n of t h e AC-losses showed t h a t i tis
e s s e n t i a l t o u s e s h o r tt w i s t
p i t c h e s , t o wrap t h e f i r s t s t a g e c a b l e i n a n o v e r l a p p i n g manner w i t h a C d i f o i l and t o f i l l t h e c a b l e w i t h a h i g h r e s i s t i v i t y a ~ i : 3 ~ r/7/.
T a b l eI
summarizes t h e p a r a m e t e r s o f t h e c a b l e .TABLE I - Parameters of t h e TUCO-Cahle
Elementary wire : No. of f i l a m e n t s O.D. of filaments Cu/NbTi r a t i o j c a t 8.15T and 4.2K O.D. of wire
1 s t Stage cable:
No. of elementary w i r e s O.D. of Cu-core Twist p i t c h
Thickness of CuNi ribbon 2nd Stage Cable:
No. of 1 s t Stage Cables 0. D. of Cu-core Twist p i t c h
3rd Stage cable:
No. of 2nd s t a g e c a b l e s O.D. of Cu-tube with CuNi ribbon Twist p i t c h
Stranded conductor:
Cross s e c t i o n ( 1 8 . 5 ~ 1 8 . ~ ) NbTi c r o s s s e c t i o n
Cu c r o s s s e c t i o n with cooling tube CdZnAg s o l d e r c r o s s s e c t i o n CuNi-ribbon c r o s s s e c t i o n I . D . of Cu-tube
Cu/NbTi r a t i o without Cu-tube T o t a l No. of f i l a m e n t s Unit l e n g t h per p i e I, a t 8.15T and 5.OK Max. l o c a l AC l o s s per p u l s e
The filamentary w l r e 1s composed o f
53.5%
Nb a n d 46.5% TI by welght. The b a r e f l r s t s t a g e c a b l e was f i l l e d w l t h s o l d e r by p a s s i n g~t
t h r o u g h a n u l t r a s o n ~ c h e a d lmmersed I n a s o l d e r b a t h (340,350 OC). I m m e d i a t e l y a t t h e e x l t o f t h e b a t h t h e c a b l e t r a v e r s e d a 20 mm l o n g d l e ,l t
calibrated t h e c a b l e dimensions and c o o l e d t h e s o l d e r down. Nexta
t h l n C d i r i b b o n was wound a r o u n d t h e b a r e c a b l e w l t h overlapping edges. Thereby some g a s 1s t r a p p e d l n t h e c a b l e . I n a s e c o n d s o l d e r i n g s t e p most of t h e v o l d s c o u l d be e l i m n a t e d by ultrasonic activation. A m c r o g r a p h of y16.l-
Iiicr0graph t h e f i r s t s t a g e c a b l ei s
shown l n F l g . 2 .of t h e TLJCO c a t l e
The s o l d e r i n g o f t h e C u N i r i b b o n o n t o t h e c e n t r a l c o p p e r t u b e was made i n two s t e p s . The f i r s t r u n was needed t o c o v e r
i t s
s u r f a c e w i t h a t h i n l a y e r o f s o l d e r t o a c h i e v e i n t h e s e c o n d one a good bond between i t s s u r f a c e and t h e C d i r i b b o n .The s o l d e r i n g equipment f o r t h e t h i r d s t a g e c a b l e i s shown i n F i g .
3.
The c a b l e p a s s e d f r o m t h e r o l l - o f f drum on t h e l e f t t o t h e f l u x e r s t a t i o n . I n a p r e h e a t e r t h e c o n d u c t o rwas warmed by c i r c u l a t i n g h o t n i t r o g e n g a s . The s o l d e r P i g . 2
-
C r o s s s e c t i o n b a t h was a n e n c a p s u l a t e d box u n d e r n i t r o g e n a t m o s h p e r e t o of t h eI st
s t a g e c a t i e r e d u c e t h e o x y d a t i o n o f t h e h o t s o l d e r and t h e e n v i r o m e n t a lh a z a r d s o f Cd. Here t h e c a b l e e n t e r e d t h e i m p r e g n a t i o n c h a n n e l i n t o which s o l d e r was pumped d u r i n g a p r o d u c t i o n run. F i n a l l y t h e c o n d u c t o r went i n t o a 200
mm
l o n g mold, made of s p e c i a l l y t r e a t e d s t e e l w i t h a n e x t r e m e l y h a r d s u r f a c e c o a t i n g . The mold was e l e c t r i c a l l y h e a t e d a ti t s
e n t r y s i d e , and c o o l e d w i t h two i n d e p e n d e n t l y r e g u l a t e d w a t e r c i r c u i t s a ti t s
o t h e r end. An a d d i t i o n a l s p r a y c o o l i n g was needed a t t h e e x i t of t h e mold.The s p e e d o f t h e s o l d e r i n g h a d t o be l a r g e r t h a n 1 m/min. t o a v o i d s i g n i f i c a n t d e g r a d a t i o n of t h e c r i t i c a l c u r r e n t d e n s i t y . On t h e o t h e r hand a c a b l e v e l o c i t y l a r g e r t h a n 2 m/min. r e s u l t e d i n a poor s u r f a c e q u a l i t y . T e s t r u n s r e v e a l e d , t h a t t h e smootheness o f t h e c a b l e e d g e s , where p e r i o d i c a l l y l a r g e volumes had t o be f i l l e d w i t h s o l d e r , depends s t r o n g l y on t h e s i z e of t h e i n n e r c o r n e r s of t h e mold. The c a b l e f a b r i c a t i o n s t a r t e d i n August 1 9 8 2 , and h a s been completed i n
Way 1983. Fig.;
-
L o l d e r l ~ l g equlpmentSLL t i l e strari?ct! c o n d u c t o r
4.
COIL W I N D I N GThe c o i l c o n t a l n s
458
t u r n s s u b d i v i d e d i n 22 h y d r a u l i c a l l y p a r a l l e l c i r c u i t e d p i e s . To i n c r e a s e t h e s t a b i l i t y margin e s p e c i a l l y i n t h e h i g h f i e l d r e g i o n of t h e c o i l t h e h e l i u m i n l e t is a t t h e i n n e r m o s t winding. Two p i e s w i t h a common s u p p l y l i n e a r e c a l l e d a pancake. One h e l i u m r e t u r n l i n e s e r v e s two p i e s from n e i g h b o u r i n g pancakes. The p i e s a r e e l e c t r i c a l l y c o n n e c t e d i n s e r i e s , t h e r e b y one may d i s t i n g u i s h i n t e r n a l j o i n t s a t t h e h e l i u m i n l e t s and e x t e r n a l j o i n t s a t t h e h e l i u m o u t l e t s ; The i n t e r n a l j o i n t s a r e a t t h e midplane on t h e o u t e r l a g of t h e D-shaped c o i l and t h e e x t e r n a l o n e s on t h e t o p i n t h e c o n n e c t i o n box.The i n n e r r i n g o f t h e c o i l c a s i n g was u s e d a s w i n d i n g bobbin. Two t h i r d s t a g e c a b l e s were wound c o n s e c u t i v e l y t o produce a double p a n c a k e i n one s e q u e n c e o f o p e r a t i o n . The c a b l e s were s a n d b l a s t e d , c o a t e d w i t h an epoxy p r i m e r and t h e n wrapped w i t h s e v e r a l l a y e r s o f g l a s s f a b r i c t a p e s . S u b s e q u e n t l y t h e i n t e r n a l j o i n t was p r e p a r e d . The c a b l e ends were u n s o l d e r e d , t h e CuNi f o i l s removed and t h e s t a i n l e s s s t e e l H e - i n l e t p i p e b r a z e d t o b o t h Cu-tubes. F i n a l l y t h e i n d i v i d u a l f i r s t s t a g e c a b l e s of b o t h c o n d u c t o r s were i n t e r l a c e d , f i t t e d i n t o a mold by f i l l i n g t h e v o i d s w i t h c o p p e r and t h e n c a s t e d w i t h CdZnAg s o l d e r , s e e a l s o F i g .
4.
To wind t h e c o i l one s t o r a g e drum was p l a c e d on t h e t o p o f t h e mandrel, t h e i n t e r n a l j o i n t f i t t e d i n t o i t s p o s i t i o n and t h e c a b l e on t h e s e c o n d drum was u s e d t o produce t h e f i r s t p i e . A f t e r w a r d s t h e c a b l e on t h e t o p of t h e c o i l was u s e d t o wind t h e s e c o n d p i e . F o r t h e o u t e r j o i n t s t h e f i r s t s t a g e c a b l e s were p r e p a r e d i n t h e same way a s f o r t h e i n n e r one. The b a r e f i r s t s t a g e c a b l e was t h e n f i t t e d around t h e h e l i u m r e t u r n l i n e i n t o t h e mold. B e f o r e c a s t i n g t h e c o n n e c t i o n w i t h t h e CdSnAg s o l d e r t h e v o i d s were a g a i n f i l l e d w i t h copper. The w i n d i n g o f t h e p i e s s t a r t e d i n O c t o b e r
1982
andi t
h a s been s u c c e s s f u l l y f i n i s h e d i n J u n e 1983.i n n e r r i n g .
S i n c e t h e n t h e o u t e r j o i n t s were i n s u l a t e d , t h e i r v o i d s f i l l e d w i t h g l a s s f i b e r m a t e r i a l , t h e package i n s u l a t i o n o f t h e c o i l f i n i s h e d and b o t h c u r r e n t l e a d s mounted, a s shown i n F i g .
5.
Then one s i d e p l a t e was b o l t e d t o t h e i n n e r r i n g a n d t h e o u t e r r i n g mounted. A r i s k y o p e r a t i o n was t o t u r n t h e c o i l u p s i d e down i n o r d e r t o i n s t a l l t h e o t h e r s i d e p l a t e . The i m p r e g n a t i o n s t a r t e d r e c e n t l yi t
t a k e s a b o u t a week time.C1-142
JOURNAL DE PHYSIQUE
5.
INSTRUMENTATIONI n a f o r c e d flow c o o l e d c o i l t h e most v i t a l p r o b e s a r e p r e s s u r e gauges and flow-meters. C o i l w i n d i n g and c a s i n g a r e c o o l e d i n p a r a l l e l . The p r e s s u r e is measured on t h e e n t r y and e x i t s i d e o f b o t h c o o l i n g c i r c u i t s by u s i n g a b s o l u t e p r e s s u r e t r a n s d u c e r s . To m o n i t o r t h e flow of t h e s u p e r c r i t i c a l h e l i u m a s p e c i a l o r i f i c e w i t h a d i f f e r e n t i a l p r e s s u r e t r a n s d u c e r
i s
u s e d/a/.
Both t y p e s of t r a n s d u c e r s , i n s t a l l e d o u t s i d e t h e vacuum v e s s e l , a r e c o n n e c t e d I;y c a p i l l a r y p i p e s t o t h e c o i l . The flow through each p i e can be i n d i v i d u a l l y m o n i t o r e d , b u t f o r t h e c a s i n g t h e r e a r e l e s s s e n s o r s t h a n i n d e p e n d e n t c o o l i n g c i r c u i t s . The p r e s s u r e d r o p a t t h e o r i f i c e t o g e t h e r w i t h t h e p r e s s u r e and t e m p e r a t u r e measured n e a r b y a r c needed t o c a l c u l a t e t h e massflow. F o r t h i s p u r p o s e t e m p e r a t u r e s e n s o r s immersed i n t h e s u p e r c r i t i c a l h e l i u m a r e u s e d w i t h t h e i r s i g n a l c a b l e s r o u t e d i n s i d e t h e c a p i l l a r y p i p e s . Temperaturei s
measured by75
thermocouples TypeE
above 40K
and below by 61 c a r b o n g l a s s r e s i s t a n c e thermometers. Some thermometers a r e d i r e c t l y a t t a c h e d t o t h e c o i l c a s i n g i n o r d e r t o m o n i t o r t h e cooldown and warm up of t h e c o i l . R e c e n t l y two f u r t h e r CGRT-s were added, t h e s e e n c a p s u l a t e d s e n s o r s w i l l be used t o m o n i t o r t h e t e m p e r a t u r e of t h e a t m o s p h e r i c p r e s s u r e h e l i u m i n t h e SC-bus c o n n e c t i n g t h e c u r r e n t l e a d s t o t h e power s u p p l y . A l i m i t e d number o f h a l l probes and s t r a i n gauges a r e mounted on t h e c a s i n g a t p o s i t i o n s where t h e h i g h e s t f i e l d and s t r a i n a r e e x p e c t e d .F o r t h e t e s t of t h e c o i l s t a b i l i t y 14 r e s i s t i v e h e a t e r s a r e enbedded i n t h e m o n o l y t h i c winding. Each of t h e 11 double pancakes h a s a f u l l t u r n h e a t e r p l a c e d between t h e i n n e r m o s t t u r n s of
i t s
two p i e s . A d d i t i o n a l h e a t i n g is p r o v i d e d f o r t h e c e n t r a l t h r e e d o u b l e pancakes by b i f i l a r l y wound 600 mm l o n g p u l s e d h e a t e r s . They a r e a r r a n g e d s y m m e t r i c a l l y t o t h e midplane i n t h e s t r a i g h t l e g o f t h e D-shaped c o i l . The f u l l t u r n h e a t e r s can be u s e d t o s i m u l a t e t h e c o n t i n u o u s n e u t r o n h e a t i n g . The p u l s e d o n e s t o c r e a t e m o d e r a t e l y f a s t d i s t u r b a n c e s n e a r t h e 8T p o i n t . To m o n i t o r t h e r e s i s t i v i t y of t h e j o i n t s and t o g e n e r a t e quench s i g n a l s t h e c o i l i s e q u i p e d w i t h35
v o l t a g e t a p s .6 . CURRENT LEADS
The LCTF d e s i g n of t h e SC-bus ar.d
i t s
t e r m i n a t i o n i s n o t o p t i m a l f o r a f o r c e d f l o w c o o l e d c o i l . We d e v e l o p e d a n d b e s t e d a vacuum t i g h t , h i g h v o l t a g e i n s u l a t e d f e e d t h r o u g h f o r LHe t e m p e r a t u r e . The e l e c t r i c a l c o n n e c t i o n between t h e Cu-lead a n d t h e SC-cable i s made a n a l o g t o t h e j o i n t s i n t h e c o i l , by c a s t i n g t h e b a r e f i r s t s t a g e c a b l e i n t o t h e Cu-lead. The f e e d t h r o u g h w i l l be c o o l e d by t h e a t m o s p h e r i c p r e s s u r e h e l i u m i n t h e SC-bus. The c y l i n d r i c a l e n c l o s u r e o f t h e l e a d s e r v e s a s t h e vacuum t i g h t h i g h v o l t a g e i n s u l a t o r between c u r r e n t l e a d and c o i l c a s i n g . T h r e e d i f f e r e n t i n s u l a t o r s made from GI0 t y p e m a t e r i a l s were t e s t e d/9/.
The l e a k r a t e o f t h e p r o b e s was l e s s t h a n l o - ' ' mbar l/s a t room and LHe-temperatures.The h i g h v o l t a g e c a p a b i l i t y a t room t e m p e r a t u r e i s w e l l above 20 kV, a t LHe t e m p e r a t u r e t h e
breakdown v o l t a g e o f two was h i g h e r t h a n t h e F i g . 6
-
P r o t o t y p e r e q u i r e d7.5
kV. F i g . 6 shows t h e p r o t o t y p e . of t h e c u r r e n t l e a aThe f i n i t e e l e m e n t methode program ASKA was u s e d t o c a l c u l a t e t h e s t r e s s d i s t r i b u t i o n i n t h e w i n d i n g and i n t h e c o i l c a s i n g f o r t h e n o s t demanding a s s y m e t r i c l o a d c a s e / l o / . The program t a k e s i n a c c o u n t t h e f r i c t i o n between w i n d i n g and c a s i n g . The c a l c u l a t i o n s proved t h e s o u n d n e s s of t h e s t r u c t u r a l d e s i g n
and s e r v e d t o s p e c i f y t h e b o l t and p i n d i s t r i b u t i o n c o n n e c t i n g t h e i n n e r and o u t e r r i n g s t o t h e s i d e p l a t e s .
Q u a s i s t a t i o n a r y t h e r m a l c a l c u l a t i o n showed t h a t t h e minimum s t a b i l i t y margin
i s
O.7K / I t / . The cooldown and warmup of t h e c o i l h a s been a n a l y s e d w i t h a 2-D f i n i t e element h e a t c o n d u c t i o n program /12/. The c o i l c a n be c o o l e d below 80K byc i r c u l a t i n g t h e s p e c i f i e d h e l i u m mass
merely i n t h e c a s i n g . Below t h i s TABLE I1 - Characteristic Coil Data t e m p e r a t u r e t h e massflow h a s t o be
s p l i t between c a s i n g and w i n d i n g i n Coolinn:
o r d e r t o a v o i d a s e p a r a t i o n o f t h e He inlet pressure 15.0 atm s i d e p l a t e s from t h e c o i l . Another He pressure drop 3.2 atm n u m e r i c a l s t u d y e s t i m a t e s t h e Total He massflow 300 g / s
He-temperature, p r e s s u r e and flow r a t e He inlet temperature 4.2 K a f t e r a quench /I?/.
I t
t a k e s i n Current sharing temperature 4.9 K a c c o u n t t h e l e n g t h and p o s i t i o n of t h e Electrical:i n i t i a l normal zone and t h e t i m e Nominal current 13.0 kA
e l a p s i n g u n t i l a dump
i s
i n i t i a t e d . Peak field 8.0 TThe maximum p r e s s u r e d o e s n o t e x c e e d Induction 1.8 H
95 a t m and t h e t e m p e r a t u r e r i s e of t h e Ampere turns 5.95 10
No. of pies 22
c o n d u c t o r
i s
a b o u t35K,
i f t h e normal Total No. of turns 458 zonei s
d e t e c t e d w i t h o u t d e l a y . A Coil cross section 450x450 mm2 quench d e t e c t i o n d e l a y e d by 5 s would Miscellaneous:c r e a t e a h o t s p o t , of 60K. Assuming
t h a t a normal zone i n one p i e would Average AC-loss per pulse 16.7 W Max. local heating 1.0 W/m d r i v e a l l o t h e r p l e s i n t o normalcy t h e Max. heat load 300 W
maximum massf low a t t h e manief o l d w i l l ~ u m p voltage 2.5 kv n o t exceed 2 kg/s. S e e a l s o T a b l e 11. Time constant of discharge 10.5 s
8. FINAL REMARKS
The c o i l w i l l be t e s t e d p r i o r t o shipment a t room t e m p e r a t u r e . I t s d e l i v e r y t o Oak Ridge i s e x p e c t e d a r o u n d t h e end o f t h i s y e a r . Funds t o b u i l d t h e c o i l were made a v a i l a b l e by t h e S w i s s N a t i o n a l Energy R e s e a r c h F o u n d a t i o n (NEFF), by t h e S w i s s Government and i n d u s t r y .
1. Vecsey G . , I E E E P r o c . of t h e 8 t h Symp. on Eng. Problems o f F u s i o n R e s e a r c h , 1179, Vol.111 ( 1 9 7 9 ) .
2.
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Vecsey G . , IEEE T r a n s . on N a g e n t i c s (MT-7)17;58,
Val. Mag-17, No 5 (1981).3.
Zichy J.A., HorvathI . ,
J a k o b B., M a r i n u c c i C . , Vecsey G . , WeymuthP.,
Z e l l w e g e r J . , Benz H . , H i l p e r t Th., HorvathI . ,
K w a s n i t z aK . ,
Maix R . K . , M a r t i H.P., Meyer G . , Rauch J . , Segessemann A . , IEEE T r a n s . on l,Tagnetics,E ,
Val. Mag-19,
X0.3
(1987).4 . I i i l p e r t Th., Maix ii.K., Hauch J . , Segessemann A . , IEEE T r a n s . on M a g n e t i c s , 2105, Val. Mag-17, No.5 ( 1 9 8 1 ) .
5 . Benz
H . ,
H o r v a t h I . , Kwasnitza K . , Maix R . K . M a r t i H.P., Meyer G . , IEEE T r a n s . on M a g n e t i c s , (KT-7)3,
Val. Mag-17, No.5 ( 1 9 8 1 ) .6 . Benz
H . ,
J a k o b B . , Koenig F . , K w a s n i t z a K . , Maix R . K . , M a r t i H.P., Meyer G . , IEEE Trans. on M a g n e t i c s ,711,
Val. Mag-19, No.3 ( 1 9 8 3 ) .7.
Kwasnitza K . , l i o r v a t hI . ,
I F C E T r a n s . on M a g n e t i c s (MT-7),2278,
Val. Mag-17,No.5 ( 1 9 8 1 ) .
8. Vecsey G . , P a p e r 3W1-01 a t t h i s c o n f e r e n c e . 9. Jakob B . , SIN R e p o r t KRYO-83.04 ( 1 9 8 3 ) .
10. Segessemann A . , H i l p e r t T b . , Rauch J . , Maix R . K . , P r o c . of t h e 1 2 t h Syn!?. on F u s i o n Techn.
1179,
p u b l i s e d by Pergamon P r e s s (1983).11
.
H a r i n u c c i C . , Weymuth P . , SIN-Report KRYO-81 .12 ( 1 9 8 1 ) .12. I 4 a r i n u c c i C . , Weyrriuth P . , Vecsey G . , IEEE P r o c . of t h e 9 t h symp. on Eng.
Problems of F u s i o n R e s e a r c h ,
2027,
Vol.11 ( 1 9 8 1 ) .13. M a r i n u c c i C . , Weymuth P., Vecsey G . , IEEE T r a n s . on M a g n e t i c s ,
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