EXPERIMENTAL STUDY ON PLASMA NONEQUILIBRIUM OF HIGH PRESSURE METAL-HALIDE DISCHARGE.

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EXPERIMENTAL STUDY ON PLASMA NONEQUILIBRIUM OF HIGH PRESSURE

METAL-HALIDE DISCHARGE.

V. Vdowin, A. Hahaev

To cite this version:

V. Vdowin, A. Hahaev. EXPERIMENTAL STUDY ON PLASMA NONEQUILIBRIUM OF HIGH PRESSURE METAL-HALIDE DISCHARGE.. Journal de Physique Colloques, 1979, 40 (C7), pp.C7- 177-C7-178. �10.1051/jphyscol:1979787�. �jpa-00219493�

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JOURNAL; DE PHYSIQUE CoZZoque C7, suppzkment au n07, Tome 40, JuiZZet 1979, page C7- 177

EXPERIMENTAL SlUDY'ON PLASMA NONEQ- OF HIGH PRESSURE METAL-l-iALM DISCHARGE.

X i

V.G. vdowini, A.D. Hahaev.

X&ZZ-Union I n s t i t u t e o f Light Sources, Saransk, X State University, Petrozavodsk, U.S. S. R.

I n r e p o r t s / l , 2 / a t t e m p t s a r e made t o c a l c u l a t e plasma c h a r a c t e r i s t i c s and t o e x p l a i n physical-chemical p r o c e s s e s i n hp mercury d i s c h a r g e w i t h mh a d d i t i - v e s on t h e b a s i s o f LTE model. However while i n v e s t i g a t i o n t h e r e were n o t i c e d a p p r e c i a b l e disagreements w i t h experimen- t a l d a t a . T h i s r e p o r t p r e s e n t s atomic plasma c h a r a c t e r i s t i c s o f a c m e t a l - h a l i d e d i s c h a r g e w i t h T11,InI and NaI a d d i t i v e s d e f i n e d a p r i o r i on lnethods n o t based on UTE concept. Also i t r e p r e s e n t s a con- c l u s i o n on nonequilibrium s t a t e i n prac-

t i c a l l y s i g n i f i c a n t c o n d i t i o n s .

1. Heavy P a r t i c l e Temperature Tg.

S t a r t i n g from t h e o r e t i c a l e v a l u a t i o n o f c o n t r i b u t i o n o f d i f f e r e n t f i l l i n g components t o plasma p o l a r i z a b i l i ty a u t h o r s showed b u f f e r g a s Eg g e n e r a l l y d e f i n e d i t under d i s c h a r g e conditions/3/.

Hence on t h e b a s i s o f holographic i n t e r - ferometry t h e r e w a s designed a method o f o b t a i n i n g t h e d i s c h a r g e interferogram/4/

and c a l c u l a t i n g t h e r a d i a l d i s t r i b u t i o n o f mercury d e n s i t g M(r)/5/. With given w a l l temperature t h i s enabled t o f i n d T (r). The method t a k e s i n t o account t h e c o n t r i b u t i o n o f a x i a l p a r t i c l e d i s p l a c e - 8 meqt i n t o t h e observed band s h i f t S(x).

The method a c t i v i t y was checked by com- p a r i s o n v a l u e s N and T e s t i m a t e d by means of holography and r a d i a t i o n and r e - %

sonance t r i p l e t broadening Hg 577/79 nm i n p u r e l y mercury d i s c h a r g e f o r which L!l!E s t a t e h a s been proved, Figure 1 sho- w e s !C measured i n mh d i s c h a r g e as com- pared w i t h "apparent" temperature g "l?"

t r h d i t i o n a l l y determined by r a d i a t i o n Hg 577/79 nm.

2. Population o f E x c i t a t i o n Levels nk.

By u s i n g t h e method of a b s o l u t e radia- t i o n measurements, r e a b s o r p t i o n o f spec- trals l i n e s / 6 / and new A b e l t s i n v e r s i o n methods t h e d i s t r i b u t i o n n k ( r ) o f raw of atomic l e v e l s TI,In,Na and Hg i n m h discharge was determined i n c u r r e n t maxim- um/?/ and minimum /2/ phase/7/. Measure- ments nk have been c a r r i e d o u t i n t h e in- t e r v a l of dosage T1I of i n t e r e s t and fo- und no a p p r e c i a b l e changes o f l g nk(Zk).

Fig.2 r e p r e s e n t s l g nk as a f u n c t i o n o f l e v e l energy & i n phase ( I ) on t h e a x i s o f discharge.

3.Normal Atom Concentration no.

Considering t h e o p t i c a l t h i c k n e s s i n t h e c e n t e r of a d d i t i v e resonance lines)) 1 and Nhtconst along t h e tube s e c t i o n t h e r e was a method of determination n o ( r ) by f u l l a b s o r p t i o n , of extraneous r a d i a t i - on i n resonance l i n e l i m i t s f o r t h e c a s e o f asymmetrical contour shape i n t h e op- t i c a l l y t h i n l a y e r P(v)/8/. While e s t i - mation P(v) we used approximation i n ac- cordance w i t h / 9 / . Experimental d a t a no ( r = O ) f o r T1,In and N a a r e showed i n f i g 2

4. E l e c t r o n Concentration ne

.

Taking i n t o account a p p a r a t u s and Van d e r Waals broadening i n t h e contour w i d t h o f a number of l i n e s N a and 11, r e s t o r e d a f t e r Abel's i n v e r s i o n , S t a r k broadening i n f l u e n c e d by e l e c t r o n s

A X

were determined and n e ( r ) was e s t i m a t e d i n accords- c e with/lO/. The method of simple c o r r e c - t i o n f o r measured l i n e s h i f t

ra

^{(x) t o}

6-A

( r ) by means of c o r r e c t i o n f a c t o r

r

^=f[J2

^(x)]

had been developed in11 I

/.

Values ne(p) determined by

d

and A i n d i s c

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1979787

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discharge conditions are in good agree- ment and represented in fig.3.

5.

Electron Temperature Te.

Having discovered significant nonequi- libration in level. population the theory of nonequilibrium atomic plasma was needed for Te evaluation /12/.

Particularly using experimental values no,

ne

and n+ for tallium on rnh dis- charge axis there was estimated nk(

E

for various Te values in discrete-dif- ruse approximation of the theory, Re- sults showed that if Te in discharge is equal' to (5-8)xIO 3 K the estimated depen- dence lg nk(E) most of all describes the experimental run lg nk( & k). Pro- bably Te forecast may be specified when evaluated the contribution of ion-mole- cular reactions to high excitated level population.

References:

1 .Re O.Shafner, Proc

.

IFEE,59 (1 971 ) ,622.

2.G.Muck, H.Popp, 71-th ICPZG, Praha (19731, Coat. .p@per, P 231,23?., 3.V.G.Vdovia,.A.A.Pustoshkin, N.A.Sam-

sonova, V.S .Shlyagin : "Complete Re- ports of All-Union Conference on Me- trology of Rapid-Ruaning Processes", VNIIOFI

,

Moscgw(USSR)

,

^{p136 (1}

^972).

4.V.G.Vdovin, A. D.Hahaev: "Complete Re- ports of the I-st All-Union Conferen- ce on Photometry", VNIIOFI, Moscow . (USSR)

,

^{~ 2 7 0}⁽¹

974)

5,VeG.Vdovin, A,D,Hahaev: "Complete Re- ports of All-Union Conference on Me-

trology of Rapid-Running Processes", VNIIOFI

,

loscow(USSR)

,

^p81(1975)^;

Swetotechnika,2 ,page 13(1975).

G.L.A.Luizova, V,A.Soluanikova, A.D.

Hahaev, V. G.Vdovin : "Complete Reports of the 4-th International Meeting on Plasma Physics and Technique, Karl-

A@-%-Stadt(GDR) ,

ad., p37 (1

974).

7.V.G.Vdovin, V.A.Mescheryakova, N.A.

Sam~onova~, A. D.Hahaev: "Complete Re- ports of All-Union Symposium of Plas- ma Knvestigation on Spectral Line Contours", FGU, Petrozavodsk(USSR), P 156 (1974).

8,V,G,Vdovin, N.A.Samsonova: "Complete Reports of All-Union Symposium of Plasma Investigation on Spectral Line Contour", PGU, Petrozavodsk, USSR,

(1

974).

g.W.Funk, H-G Kloss, 11-th ICPIG,Praha, (19731, Cont. paper, p 400.

'IO.R.R.Griem, Plasma Spectroscopy, Mo Graw Hill, CO, New York, 'l964.

11 .V.G,Vdovin, A.D.Hahaev et al: ?-st All-Un ion Conference on Low-Temperatu- re Plasma Spectroscopy Report, LGU, Leningrad, (1973). . ,

12.L.M.Biberman, V.S.Vorobyev, I.T.Yaku- bov, Proc. 1~EE,'59,(1971), pl31;Col.

MGD "Method of Electric Energy Genera- tion", edit. Energia, Moscow (1968).

Pig. I 1@; nk

Fig.