SCIENTIFIC ABSTRACT KERVALIDZE, K.N. - KERZON, I.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R000721610007-7
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Sequence Number: 7
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

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fields to suppress eruptive inotabilit-les of t',.,,e
T@,,ere are 4 f-logures; and 21-4 references, 1"7. Soviet, 0'
U@K.,__5 U.S, The rroa@ rie-aent TJ.K. and U.S. reference:.,,
are: J. L. Craston. et al, Fvcccr.,", -je,@eva C-onference
6n "-he Peaceful Uses ol A@o,,,,ic Ene:,C-i-, FaD-r 15, -Ii4,
1958; S A Colgate, H. P. Furth, Scierl'e3 128, 14-r
)-,-20, -7@,7 h r-3on, ',-;. f@. Balcer, S, A.
5.@ , 958@; 0 A. Ande - .
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AUTHORS:
TITLE:
84560
25, 0 1
5/057/60/030/011/003/009
B006/BO54
Kvartskhava, I. F., Kervalldze, K. ff., and
Instability of an Inductive (Theta) Pinch
PERIODICAL: Zhurnal tekhnicheskoy fiziki, 1960, Vol. 30, No. 11,
PP. 1321-1328
TEXT: The authors studied one of the forms of plasma instability with
which an eruption of local plasma formations from the surface of a strong-
ly compressed pinch can be observed. They call this form "eruptive
instability". The authors had already reported on this subject at the
4th International Conference on Ionization Phenomena in Gases (Upsala, V@
1959). The invgstigations were made by means of a series of slow-motion
pictures (2-10 per second) of theta and zeta pinches, The pictures were
taken with a rotating mirror through a narrow slit from the terminal sur-
face of a cylindrical chamber in axial direction. As these experiments
had been described earlier, the authors only discuss the result a of thi
photographic method. A photographic camera of the type C@P-2M (SFR-2M)@
was used. The eiEperiments were made with hydrogen,' helium, nitrogen, air
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Instability of an Inductive (Theta) Pinch S/057/60/030/011/003/009
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argon, and krypton at different pressures. It was shown, among other
things, that the effects observed depended greatly on the shape of the
chamber cross section. The-photographs taken are partly shown in Figs. 1
and 2, and the corresponding experimental conditions are given in Tables
1 and 2, respectively. In the following, the individual photographs
and their conditions are described and discussed. The investigations
showed that all plasma motions are very complicated, and that the in-
stabilities of the pinches are of different forms. A relationship was
found to exist between the character of plasma motion and the form of
instability. In the pressure range from a few mm Hg up to 10-2 mm Hg, it
was found that the intensity of eruptive instabilities increased with
decreasing pressure, and at still higher pressures, such instabilities
do no longer occur. nkT > H2/8n is a necessary condition for the occur-
rence of an eruption (nkT - thermal pressure of plasma). There are
2 figures, 2 tables, and 12 references: 3 Soviet, I German, 3, British,
2 US, and 3 Swiss.
SUBMITTED: May 30, 196o
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Legends of the tables-.
Fig. 1
Table I
(Chamber length 100 am)
Capacitor
voltage
Ek VI Capacitance
[p f] Gail
length
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half-cycle
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diameter
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Boo6/BO54
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(Chamber length a-u-50 am, k - 100 am)
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8361o
S/05 60/0!,6/005/043/050
B006YB063
AUTHORS: Kvartakhava, I. F., Kervalid Gvaladze, Yu. 3.
TITLE: Instability of an Induction Pinch
PERIODICAL: Zhurnal eksperimentallnoy i teoraticheskoy fizikij 19609
Vol. 36, No- 5# PP- 1641 - 1643
TEXT: The present "Letter to the Editor" gives a fundamental represen-
tation of plasma motionTin inductive (theta) pinches, and describes the
experimental conditions under which the accompanying photographs were
taken. At the Fourth International Conference on Ionization Processes
in Gasep, held at Upsala in 1959, the authors gave a report on the new
kinds of instability of linear and inductive pinches, which had been ob-
served during a compression shock in a plasma. These phenomena had been
detected photographically. In the present paper) the authors report on
further investigations carried out with a quick-acting camera of the
typejC@P-2rj (SFR-2M). The effects of the instability of V@-pinches were
reed-rded on a time magnifier basis. These effects are related to an
azimuthal inhomogeneity of the velocities of the radial motion of the
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B006/BO63
plasma during the compression shook. The various experimental conditions
are given in a table. Glass or porcelain vessels served as discharge
chambers, and air, nitrogen, and Eelium (pressures of 0.1 torr; one ex-
perimental series waa performed with He at 0-07 torr) were used as dis-
charge gases. The accompanying Fig. reproduces some of the photographs.,
the major part of which were taken in cylindrical discharge chambers.
Those in the last two rows were taken in chambers with square cross sec-
tions. The exposure was 0.5 psec, and there was an interval of 2 psee
between the various exposures. The photographs are described in detail
along With the forms of the individual columns and the effect of the
compression shook on them. All these effects vanish at higher gas pres-
sure. Also in the case of smaller chamber diameters, they are largely
reduced or absent. These phenomena are primarily due to the magneto-
hydrodynamic character of plasma motion in the magnetic field. For
example, the azimuthal rotation of the expansion figures of the pinch
in comparison to the compression figures is indicative of the signifi-
cant role played for these processes by the reflection of shook waves
at the magnetic fields captured by the plasma. The changes of the
spatial figures are such as to remind one of the phenomena of an elastic
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Instability of an Induction Pinch S/056Y60/036/005/043/050
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body whose "coefficient of elasticity" is largely dependent on the direc-
tion of the magnetic field. A qualitative analysis of the data obtained
shows that the plasma is not in equilibrium when it is in the maximum
compressed state. Comparatively weakly damped intense macroscopic mo-
tions are induced in it, which lead to eruptive instabilities. The lat-
ter render it difficult to obtain a high-temperature plasma in pulsed
processes. Details of these investigations will be published at a later
date. There are I figure, 1 table, and l'Soviet reference.
SUBMITTED: January 23, 1960
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21537
S/057/61 1031100410031018
c2 13125[B205
AUTHORS: Plyutto, A. A. and KervalidLe@, K_t__N.
TITLE: Calculation of the radial motion of plasma in the case of an
induction pinch
PERIODICAL: Zhurnal takhnicheskoy fiziki, v. 31, no- 4, 1961, 400-406
TEXT: The present paper deals with the calculation of the motion of plasma
on the assumption that the current -carrying layer has an infinite conductivi-
ty and the plasma is completely raked. Particular attention has been paid to
the physical aspects of the problem. The equation of motion is considered
on the following simplifying assumptions: The breakdown through the gas
occurs instantaneously. The magnetic field between plasma envelope and
solenoid is given by B, - 4ni/c - B. The plasma motion is schematically
shown in Fig. 1. The equation of motion for the plasma front reads:
d (M dr) . -(@! - P)2Ttr (1), where B is the magnetic field strength,:M
@it dt 8n
the mass per unit length of the plasma front, and P the initial pressure of
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S/05 61/031/004/003/018
Calculation of B125YB205
the gas. since M - nQ(R 2 _ r2 and B - OI/c, it follows from Eq. (1) that
d [(.2 2) dr r (2nI2
- r t] . 2 p) (2). This equation can be solved if
Tt- Q 0
the rule underlying the variation of I is -'nown. If the solenoid is fed by
a condenser bank, then the current strength is given by
d (LI) + RI + Idt (3), where I is the current strength per
c2 dt cc 1
unit length of the aolenoid, 1 the length of the solenoid, Vo the initial
voltage of the condenseraj L the Inductance, R the ohmic rasi8tancef and C
the capacitance in the solenoid circuit. The inductance L of the external
circuit grows as*.the plasma approaches the axial and may be written as
L - LO + Lr ' L0 + (4n 2/1)(R 2 _ r2) (4), where LO is the constant compone&,
L the component growing from 0 to (4n 2/1)(R 2 _ r2) as the plasma approaches
r 0
the axial (2), (3), and (4) can be used to determine the velocity of the
plasma for any instant from the beginning of the process up to the first
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'M05Y611031100410031018
Calculation of B125 05
pinch of the plasma column. The equation for a linear pinch derived by
-M.. A. Leontovich and S. M. Osovets (Atomnaya energiya, Ito. 3, 81,,1956) is
mentioned. The second part of the present paper deals with the solution of
the equation of motion. For the period of convergence of the plu,,;ria one
obtains t