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THE SEPARATION OF ISOTOPES OF NOBLE GASES IN STATIONARY HIGH FREQUENCY DISCHARGE WITH TRAVELLING MAGNETIC
FIELD
E. Gorbunova, A. Ezubchenko, A. Karchevsky, Yu. Muromkin
To cite this version:
E. Gorbunova, A. Ezubchenko, A. Karchevsky, Yu. Muromkin. THE SEPARATION OF ISO- TOPES OF NOBLE GASES IN STATIONARY HIGH FREQUENCY DISCHARGE WITH TRAV- ELLING MAGNETIC FIELD. Journal de Physique Colloques, 1979, 40 (C7), pp.C7-211-C7-212.
�10.1051/jphyscol:19797104�. �jpa-00219074�
JOURIU'AL DE PHYSIQUE CoZZoque C7, suppZ6ment au n07, Tome 40, JuiZZet 1979, page C7- 211
THE SEPARATION OF IWTOPES OF NOBLE GASES IN STATIONARY HIGH FREQUMCY DIXHARGE W I T H TRAVELLING MAGNETIC FIELD
E.F. Gosbunova, A.N. Ezubchenko, A.I. Karchevsky and Yu. A. Muromkin.
I.V. Kurchatov I n s t i t u t e of Atomic Energy, Moscow, U.S.S.R.
Several papers /1+3/ a r e devoted t o research of separation properties o f high frequency discharge with t r a v e l l i n g magnetic f i e l d . It i s shown, t h a t t h e discharge of such a kind i s able t o sepa- r a t e isotopes and gas mixtures. The sepa- r a t i o n of gas mixtures i s connected in t h e f i r s t of a l l , with d i f f e r e n t ioniza- t i o n degree of components. The mechanism of isotope separation has not been clea- r e d up f u l l y yet.As probable causes of isotope separation t h e processes of baro- diffusion and thermodifasion were poin- t e d out. It i s proposed /2/,that t h e ob- served isotope separation i s connected with thermodiffusion in t h e n e u t r a l plas- ma component. m e reference t o t h e baro- diffusion separation mechanism i s suppor- t e d by t h e f a c t t h a t i n some conditions /1,3/ t h e coincidence of t h e measured enrichment coefficient
&
with t h e calcu-t h e formula
,
whe~e, and a r eof t h e discharge chamber
, p
i s atomic weight. It was expedient t o f i n d out how widely suchFig. I. B p erimental arrangement e r . 'Phe discharge chamber was placed i n t h e solenoid of t h e delay l i n e (2),which consisted of 60 c e l l s . The length of t h e solenoid was 85cm.The phase velocity of t h e wave
Ipp = 5 +9 lo6 cx ,
frequency
f = 80 +46O1Hz*
The amplitude of Hz-component of t h e magnetic f i e l d on t h e a x i s of t h e solenoid a t varieng t h e generator frequency in t h e above mentio- ned range decreased from 100 t o 20,,,
.mepower dissipated in t h e discharge was simple r e g u l a r i t y of isotope separation 2
+
14 kw.e f f e c t in plasma takes place. Aiming a t t h i s t h e comparative investigation o f isotope separation of t h r e e gases,which considerably d i f f e r i n t h e i r atomic weight: xenon, krypton and neon, was carried out.
The scheme of t h e apparatus i s shown in Fig.1. !Phe discharge was exited bi t h e water-cooled quartz chamber ( I ) IlOcm long and with t h e 6,5cm in diamet-
The i n t e r a c t i o n of t h e t r a v e l l i n g wave with plasma r e s u l t s in t h e appearan- ce of t h e pressure difference
&P=@-PL
in t h e closed-ended chamber. The value of
A P
i s in a good agreement with t h e formula:AP
r- w
(tt/-dissipat ed power,5 -
oros&i%%ion of t h e chamber)In t h e experiments t h e value of
A P
reached
2,s (0-tn6
t h e discharges with t h e same value ofAP
t h e r e l a t i o nArticle published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19797104
A
can d i f f e r greatly, depending on t h e9
hi i a l pressure
P,
and gas temperature.A t constant t h e change of t h e value of is realized by means of changing t h e nagnitude of t h e t r a v e l l i n g magnetio f i e l d 4
.and, in accordance, %he power dissipated in plasma. The maximum values of
,
under which t h e naasureraents of isreope separation e f f e c t were made, were f o r t h e discharge in xenon
-
140,for t h e dischar- ge in krypton-
40, f o r t h e discharge in neon-
3 ( s t a b l e discharge inneon wasexited onlg under higher i n i t i a l pressures than in xenon and krypto$.llhe minimum values of
S
rl ( Po = 2
mmHI 1 .
Fig.2. Krgpton enrichment coefficient versus i n i t i a l pressure
U I = g i 1 4
~ v / ,f =460
rUrIn Fig.2,3 t h e dependences of enrichment c o e f f i c i e n t s
&
on t h e i n i t i - a l pressureKT
and a r e shown. For comparison t h e values of&
calculated by t h e formula& =i en -& a r e dorm in
t h e f i g u r e s in dotted l i n e s ( t h e values P
of
P2
andPd
experimentally measured a r e used) .The experiments showsthat t h e quantitative coincidence of t h e observed isotope separation e f f e c t with t h e e f f e c t c h a r a c t e r i s t i c of barodiffusion in non- ionized gas, takes place only under some i n i t i a l pressures . m e e f f e c t described above can be l a r g e r a s well a s smaller than t h e barodiffusf on one.!I!he l a s t i s noticable Fn t h e dikcharge in neon,p.< 3-10-a~~
(Pig.J),and in t h e dis- charge in xenon,when t h e value ofPt s
. 1 . 1 0 - ~ m mN8.
For clearing up t h e contribution of thermodif fusion in isotope separation ef
-
f ect a cooled quartz tube with t h e 12mm- diametre was placed on t h e a x i s of t h e discharge. In t h e tube presence t h e ef-
f e c t decreased f o r 3@+50 percents.
But
such experiments do not make it possible t o estimate quantitatively t h e contribu- t i o n of thermodiffusion. A s t h e circula- t i o n of gas in t h e discharge i s caused onlg by t h e r a d i a l non-uniformity of t h e acting force, t h e c h a r a c t e r i s t i c s of t h e c i r c u l a t i n g f l o w s , in t h e first approach, do not depend on t h e r e l a t i v e l y small diametre tube being on t h e axis.
m e absence of t h e quantity e s t i m a t i o n of thermodiffusion influence hasn't made it possible t o distinguish "purew plasma isotope separation e f f e c t
.
References
1. R.d.Demirkhanov, A.N.Doroshenko, V.N.
Zharikov, I.J.Kadysh, A.G.Kirov, V.P.
Minenko. X I 1 1 ICPIG,Contributed Papers, P a r t 11, p.699 (1977).
2. A.M.&~W!BC&, B.JI.Map~rrrrbff~, H.A.1Iono~
E.II.IIoT~HEH.@HsPIR~
117ia3m, 3 , 409 (1677)3.
E.Q. ropdgao~a , A.H.Esgbne~~o
A.M.K a p s e ~ c M ,
IO,A.?&PONIEEBHA. h.Eb6~se~.
lTHcbm E'E 3,154 (1977j;
3,
598 (1977) ; 4, 316 (1978).$ig .3. Neon enrichment coefficient &d - dissipated power versus i n i t i a l pressure
