HAL Id: jpa-00219111
https://hal.archives-ouvertes.fr/jpa-00219111
Submitted on 1 Jan 1979
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.
L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
HIGH-CURRENT DIFFUSE DISCHARGE WITH THE EXPLOSIVE CATHODE PROCESS
A. Kchuzeev, Yu. Korolev, V. Kuzmin, G. Mesyats, V. Rotshtein, I.A.
Shemyakin
To cite this version:
A. Kchuzeev, Yu. Korolev, V. Kuzmin, G. Mesyats, V. Rotshtein, et al.. HIGH-CURRENT DIFFUSE DISCHARGE WITH THE EXPLOSIVE CATHODE PROCESS. Journal de Physique Colloques, 1979, 40 (C7), pp.C7-281-C7-282. �10.1051/jphyscol:19797138�. �jpa-00219111�
JOURNAL DE PHYSIQUE CoZZoque C7, suppZ6ment au n07, Tome 40, JuiZZet 2979, page C7- 281
HIGHCURRENT DIFFUSE DISCHARGE W I T H THE EXPLOSIVE CATHODE PROCESS
ASP. Kchuzeev, Yu.D. Korolev, V.A. Kuzmin, G.A. Mesyats, V.P. Rotshtein and I.A. Shemyakin.
The U. S. S.R. Academy of Sciences, . Siberian Branch, t h e High-Current EZectronics I n s t i t u t e , Tomsk.
Quasi-stable glow discharge phase is knowb to be characteristic for the pulse break- down of gases by the uniform initiation of initial electrons. The papers 11-31 show that the contraction of the glow dis- charge can be schematized as follows, At first the cathode spot is formed on ac- count of the cathode instability and of the explosive emission. Then the current density increases in the discharge column against the cathode spot and one can ob- serve a diffuse channel bound to the spot against a background of the glow discharge.
The high-conductive contracted spark chan- nel germinates along the diffuse channel on the cathode and the anode sldes at the
third stage. The investigations carried out in noble gases (Ar, Kr, Xe) and in noble gases with small additions of halo- id-contained compounds (SF6, CC14) showed a great number of the cathode spots and diffuse channels to be ignited in the in- terelectrode volume [4,5]
.
These channels form a column of a homogenous plasma when mixing. The discharge involved was called as a.high-current diffuse discharge (H-CrD,D.). At present there are repre- sented the results on investigations of H-C.D.D. )1, The investigation of a charge in noble gases with additions of haloid- -contained compounds
The. discharge initiation was carried out by a fast electron beam with the current density off jb = 1,5 g/cm2 and with dura- tion of ~ o - ~ s , At a small storage capaci- tance value in the gap a quasi-stable glow discharge with ionizing multiplica- tion burns (Fig. la). At a large storage capacitance value after the quasi-stable
glow discharge phase there is observed a H-C.D.D. (Fig. lb). The photos and oscil- lograms of the current (Fig, I) are ob- tdned in the following conditions:
ArrSF6 -100:0,13, the gap length is d =
= 1,4 cm, an initial capacitance voltage is
U o =
10 kV, a puncture voltage isUP
= 11,2 k ~ , a) C = 2.10-~~, b)C
== 47.10-~~. The Fig. 2 shows the photos of the interelectrode gap and the photos of a high-current diffuse discharge spect- rum section and of spark spectrum section at static gas breakdown in the mixture ArsXe: SF6. The presence of the continuum and of the electrode material lines are characteristic.of the spark spectrum, while the high-current diffuse .discharge spectnun is characteristic of quasi-sea- ble glow discharge one. In mixtures Bra
:Xe(Hr): SF6(CC14) the most bright sections correspond to luminescence bands of XeF, KrF, XeCl.molecules. One of the proper-
ties of H-C.D.D. is connected with the current density constancy with invari- able parametere of the electric circuit
C4.51
2. The investigation of the discharge in the nitrogen and in the air.
The problem of the H-C.D.D. ignition com- es to the decision of the problem of si- multaneous ignition of a great number of diffuse channels, an&, secondly to the prevention of contracting, i.e. of germi- nation of high-current channel from the cathode spot. A t atmospheric pressure it wasn't succeeded in realizing such a dis- charge condition. IIowever, the results of investigations at P s 50
-
100 rnm. m.c.proved to be =ore hopeful. A quasi-stable glovr discharge with the current density
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19797138
of 500 ~ / c m ~ ignited by initiation of ini- tial electrons by means of ultraviolet lighting. The interelectrode gap supply (d = 0.7 cm) was carried out from the ge- ,nerator on cable lines
(p
= 75 Ohm).The applied voltage is Uo = g 25 kV. After initiating there is ignited a quaai-stable glow discharge in the gap (Fig. 3a). In 20-30 ns the emergence of cathode spots.
is observed (Pig. 3b). Later on the c u p rent against the spot increases. The re- gistration of this current was carried out by the Rogovskyls belt with sectioned cathode (Fig. 3f ), There was inserted wire into the cathode. If the cathode spot emerged on the wire the Rogovsky's belt registrated the current accompanied
the cathode spot emergence. The current oscillogram with one spot on the wire is shown in Fig. 3c
.
If there are ap- peared some spots on the cathode the transition from the diffuse channel to the contracting one became slower(Fig. 3d). The corresponding photo of the discharge is presented in (Fig. 3e). The discharge ignition duration in such a form achieved 200 ns. These experiments show a possibility of realization of the H-C.D.D. conditions in molecular gases
over a great electrode surface.
REFERENCES
I. M,Bf.Kekez, M.R.Barrault, J.D.Craggs.
J.Phys. D: Appl. Phys*, 1970, V01.3, rS 12, p. 1886.
2 R,B.Baksht, Yu.D.Korolev, G.A.lesyats.
Phizika Plazma, 1977, t 3, v.3, s.652.
3 Yu.D,Korolev,.V.A.KuzInin, G.A.Mesyats, V.P,Rotshtein, JTP, 1979, t 49, v.2, 8.410.
4 Yu.I.Bichkov, Yu.D.Korolev, G.A,Me- syats, A,P.Kchuzeev, 1.A.Shemyakin.
Pisma v JTP, 1977, t
3,
v,21,se1121.5 Yu.I.Bichkov, Yu.D.Korolev, G.A.hle- syats, A.P.Kchueeev, 1.A.Shemyakin.
Izvestiya Vuzov, nFizikafl, 1978, N
