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THE FORCED FLOW HIGH FIELD TEST FACILITY SULTAN
I. Horvath, G. Vécsey, P. Weymuth, J. Zellweger, E. Balsamo, G. Pasotti, M.
Ricci, N. Sacchetti, M. Spadoni, J. Elen, et al.
To cite this version:
I. Horvath, G. Vécsey, P. Weymuth, J. Zellweger, E. Balsamo, et al.. THE FORCED FLOW HIGH FIELD TEST FACILITY SULTAN. Journal de Physique Colloques, 1984, 45 (C1), pp.C1-93-C1-96.
�10.1051/jphyscol:1984120�. �jpa-00223675�
JOURNAL DE PHYSIQUE
Colloque C l , supplément au n° 1, Tome 45, janvier 1984 page Cl-93
THE FORCED FLOW HIGH F I E L D TEST F A C I L I T Y SULTAN
I . H o r v a t h , G. V e c s e y , P . Weymuth, J . Z e l l w e g e r , E . P . Balsamo*, G. P a s o t t i * , M.V. R i c c i * , N. S a c c h e t t i * , M. S p a d o n i * , J . D . E l e n * * , W.M.P. F r a n k e n * * and J . A . R o e t e r d i n k * *
Swiss Institute for Nuclear Research, (SIN) 5234 Villigen, Switzerland
*Comitato Nazionale per la Riceraa e per to Sviluppo dell'Energia Nucleare e delle Energie Alternative (ENEA), 00044 Frasoati, Italy
^^Netherlands Energy Research Foundation (ECN), 1755 ZG Petten, The Netherlands
Résumé - La c o n s t r u c t i o n de SULTAN I , un p r o j e t conjoint de ENEA ( I - F r a s c a t i ) , ECU (ML-Petten) et SIK (CH-Villigen) , a é t é terminée. Le champ magnétique et le diamètre i n t é r i e u r sont de 8 Tesla et 105 cm, respectivement. Dans ce papier le montage, le refroidissement et la mise en marche du système sont d é c r i t s . L'équipement SULTAN offre un grand nombre de p o s s i b i l i t é s (p. ex. v a r i a t i o n des paramètres, t e l s que le champ magnétique, le courant et le type de refroidissement du supraconducteur) pour é t u d i e r le comportement s t a t i q u e ou la s t a b i l i t é d'un supraconducteur en conditions nominales.
A b s t r a c t - The c o n s t r u c t i o n of t h e 8 T e s l a , 1 m b o r e T e s t F a c i l i t y SULTAN - I , a common a c t i o n of ENEA ( I - F r a s c a t i ) , ECN ( N L - P e t t e n ) and SIN ( C H - V i l l i g e n ) , i s c o m p l e t e d . R e s u l t s on a s s e m b l y , cooldown and t h e f i r s t o p e r a t i o n of t h e whole system a r e p r e s e n t e d . The SULTAN f a c i l i t y p r o v i d e s a wide range of c a p a b i l i t y of p a r a m e t e r v a r i a t i o n s ( f i e l d , c u r r e n t , c o o l i n g ) f o r t h e i n v e s t i g a t i o n of s t e a d y s t a t e performance and s t a b i l i t y of t e c h n i c a l s u p e r c o n d u c t o r s u n d e r nominal and l i m i t i n g c o n d i t i o n s .
1 . INTRODUCTION
The g e n e r a l o b j e c t i v e of t h e SULTAN c o l l a b o r a t i o n i s t o d e v e l o p f o r c e d flow c o n d u c t o r s f o r t h e f u t u r e a p p l i c a t i o n s mainly i n h i g h f i e l d f u s i o n d e v i c e s .
I n o r d e r t o o b t a i n d a t a and e x p e r i e n c e on d i f f e r e n t c o n d u c t o r t y p e s and f o r d e m o n s t r a t i o n of t h e i r performance i n medium s i z e h i g h f i e l d c o i l s t h e t e s t f a c i l i t y SULTAN I was b u i l t a t SIN, V i l l i g e n a s a common v e n t u r e of t h e t h r e e p a r t i c i p a t i n g European l a b o r a t o r i e s ENEA, ECN and S I N .
2 . CONSTRUCTION OF SULTAN I
D e t a i l s on t h e d e s i g n of t h e f i r s t s t a g e f a c i l i t y , c o n s i s t i n g of t h e major s u b s y s t e m s : o u t e r c o i l (ENEA), i n n e r c o i l (ECN), c r y o g e n i c s y s t e m , power s u p p l i e s , d a t a a q u i s i t i o n and s a f e t y system ( S I N ) , a r e g i v e n e l s e w h e r e / 1 / - / 5 / .
Main f a c i l i t y p a r a m e t e r s a r e l i s t e d i n T a b l e I f o r t h e background f i e l d and i n Table I I f o r t h e o p e r a t i o n s u p p o r t s y s t e m . C o n f i g u r a t i o n of t h e main components i s shown i n F i g u r e 1 .
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1984120
JOURNAL DE PHYSIQUE
F i g .
ENEA Nagnet
ECN Magnet
He Pump C r y o s t a t Vacuum Tank
Ragnet S u s p e n s i o n R i g I r o n S h i e l d i n g T r a n s f e r l i n e C u r r e n t Leads
1
-
Three d i m e n s i o n a l view of SULTANTABLE I
-
Main P a r a m e t e r s o f t h e two Background C o i l sTABLE I1
-
O p e r a t i o n S u p p o r t System I n n e r D i a m e t e rO u t e r D i a m e t e r Length
Nominal F i e l d Ampereturns O p e r a t i n g C u r r e n t S t o r e d Energy T o t a l Weight
O u t e r C o i l l .30 2 .OO l .TO 6 .OO 9.10 5.28 40 - 0 0 1 8 -00
T o t a l R e f r i g e r a t i o n Power a t 4 K 9 0 K Sample C o o l i n g
max. Massflow (4.4K) min. T e m p e r a t u r e C u r r e n t S u p p l i e s : o u t e r c o i l
i n n e r c o i l sample
D a t a A c q u i s i t i o n Channels: f a s t (40 H Z ) slow ( 1 Hz) Vacuum Chamber: l e n g t h
d i a m e t e r h e i g h t Weight of X a g n e t i c S h i e l d i n g
1 .4 kW 5.0 kW
s u p e r c r i t i c a l , s u p e r f l u i d , two p h a s e h e l i u r c
8 g / s e c 1.8 K 5.5 kA 2.0 kA 10.0 kA 6 4 160
4.2 m 2 . 5 m 5.1 m 100.0 t o n s
I n n e r C o i l 1 .05 1 .26 1 . l 3 2 .OO 2.20 1 .86 15.00
4 .OO
MJ
Mechanical s y s t e m s u p p o r t , vacuum chamber, c r y o g e n i c s y s t e m ( i n c l u d i n g ENEA l i q u i d h e l i u m pumps) power s u p p l i e s , l e a d s and d a t a a q u i s i t i o n s y s t e m were i n s t a l l e d and s u c c e s s f u l l y t e s t e d i n A p r i l 1982. Both c o i l s a r e b a s e d on f o r c e d f l o w c o o l e d c o p p e r s t a b i l i z e d NbTi c o n d u c t o r s . The ENEA c o i l was b u i l t by ANSALDO w i t h a c o n d u c t o r of LtlI, t h e ECB c o i l was f a b r i c a t e d by HOLEC w i t h a n MCA c o n d u c t o r . F i n a l i n s t a l l a t i o n o f t h e background magnets was f i n i s h e d i n A p r i l 1983. The p i c t u r e t a k e n i n t h e assembly p h a s e shows t h e ENEA magnet on t h e mounting r i g and t h e ECN c o i l i n f r o n t b e i n g p r e p a r e d f o r i n s t a l l a t i o n .
FIG. 2
-
The two magnets b e f o r e i n s t a l l a t i o n i n t o t h e SULTAN vacuum t a n k .3. FIRST OPERATION
IK'
1
0 ECN asn net. Temperature of outlet GasA f t e r a d e t a i l e d programme of room ENEA Magnet Tempcralurc at innermost Poml R R e f l l g e r a t o ~ d l r e s l l y connected
t e m p e r a t u r e c h e c k s on vacuum, i n s u l a t i o n , P Llguia nelnum Pumps opcratlns
c o o l i n g and i n s t r u m e n t a t i o n t h e s y s t e m was p r e c o o l e d by a h e l i u m l o o p d r i v e n by p a s s i n g a l i q u i d n i t r o g e n h e a t exchanger.
I n i t i a l s p e e d was 0 . 8 K/hour a n d was t h e c o m p r e s s o r s of t h e r e f r i g e r a t o r , b u t zoo
r e g u l a t e d i n s u c h a way, t h a t t h e
,,,
t e m p e r a t u r e d i f f e r e n c e i n t h e i n d i v i d u a l c o i l s and between t h e c o i l s n e v e r exceeded 60 K i n o r d e r t o a v o i d e x c e s s i v e t h e r m a l s t r e s s e s .
FIG. 3 - Cooldown of SULTAN I
Cl-96 JOURNAL
DE
PHYSIQUEA t a t e m p e r a t u r e l e v e l o f 110 K t h e r e f r i g e r a t o r was c o u p l e d t o s y s t e m and f i n a l l y cooldown was a c c e l e r a t e d by r u n n i n g t h e l i q u i d h e l i u m pumps f o r t h e ENEA c o i l . The whole cooldown, shown i n F i g u r e
3,
proceeded i n p r e c a l c u l a t e d s c h e d u l e . I n o r d e r t o e l i m i n a t e f r e q u e n t need f o r t h i s t i m e consuming p r o c e d u r e ( t o t a l cooldown t i m e 22 d a y s ) f o r sample t e s t s a h o t b o r e i s u n d e r p r e p a r a t i o n .Seven e n e r g i z a t i o n r u n s were performed i n 4 weeks, t h r e e w i t h t h e ENEA maknet a l o n e , one w i t h t h e ECII c o i l , and f i n a l l y t h r e e w i t h b o t h c o i l s t o g e t h e r .
The ECB c o i l d i d n e v e r quench a t t h e t e s t r u n s . T h i s c o i l was o p e r a t e d on f u l l c u r r e n t a t a peak f i e l d o f 8 T e s l a w i t h s u p e r c r i t i c a l c o o l i n g a t a t e m p e r a t u r e l e v e l o f 4.6 K , s l i g h t l y h i g h e r t h a n d e s i g n e d f o r (4.4 K ) . I n s p i t e o f t h e l i m i t e d margin o f 0 . 8 K , of t h e l a r g e s t o r e d e n e r g y (15 M J ) a n d o f t h e h i g h l e v e l o f L o r e n t z f o r c e s ( 1 8 0 PPa s t r e s s i n t h e c o p p e r s u b s t r a t e ) t h e c o i l o p e r a t e d s a f e l y f a r beyond t h e c r y o g e n i c s t a b i l i t y l i m i t .
The ENEA magnet h a s been d e s i g n e d f o r c o o l i n g by f o r c e d f l o w of s l i g h t l y s u b c o o l e d helium. Caused by a mismatch a t t h e c r y o g e n i c f e e d c o n n e c t i o n s , r e s u l t i n g i n a n u n e x p e c t e d a d d i t i o n a l p r e s s u r e d r o p , i n t h e f i r s t run o n l y two-phase c o o l i n g c o u l d be a c h i e v e d . I n t h i s s i t u a t i o n a n uneven d i s t r i b u t i o n o f c o o l a n t f l o w i n t h e 40 p a r a l l e l p a n c a k e s c o u l d n o t be a v o i d e d . N e v e r t h e l e s s , t h e d o u b l e c o i l s y s t e m c o u l d be o p e r a t e d a t 98% o f t h e d e s i g n v a l u e . I n t h e c o u r s e o f d i f f e r e n t t r i a l s a t d i f f e r e n t c o o l i n g c o n d i t i o n s and d i f f e r e n t f i e l d b a l a n c e between t h e two c o i l ' s a s l i g h t v a r i a t i o n o f q u e n c h i n g c u r r e n t was o b s e r v e d d e p e n d i n g on c o o l a n t massf low (20-150 g / s ) , w i t h no i n d i c a t i o n o f t r a i n i n g .
4. FUTURE TESTS
A f t e r minor m o d i f i c a t i o n s i n t h e s u p p l y manifold and i n s t a l l a t i o n of a c o l d t e s t r i g f i r s t c o n d u c t o r t e s t r u n s a r e p l a n n e d f o r J a n u a r y 1984.
D e t a i l e d d e s c r i p t i o n of t h e p l a n n e d A-15 c o n d u c t o r development and t e s t progranme a s w e l l a s t h e f u t u r e h i g h f i e l d e x t e n s i o n o f SULTAN a r e g i v e n i n Ref. / 6 / .
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