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The electron energy distribution in neon high frequency discharge
Classified
abstracts
1335-1350
1335. Practical influences insulation. (USA)
on thermal
design
17 : 34 of high performance
The thermal aspects of a helium-purged 6.35 micron aluminized mylar insulation system applied to a 2.67 m diameter tank, and future requirements and approaches are discussed. Graphic data on the thermal conductivity of insulation materials as a function of helium gas pressure is presented. E H Hyde, in Rep NASA-TM-X-35670, Aerospace Reps, 6 (5), 756, N68-14653).
1967, Vol. 2, 3-27 (Sri Tech
17 : 34 1336. Assessment of the status of cryogenic insulation development. (USA) Research effort for high performance insulation development for
space application during 1960-1967, and project requirement efforts for the time frame 1967-I 970 are graphically depicted and discussed. C C Wood, Rep NASA-TM-X35670, 1967, Vol. 2, 81-83 (Sri Tech Aerospace
Reps, 6 (5), 756, N68-14658).
1337. Measurement (USA)
17 : 34 of heat flow in the insulation of cryogenic fuel tanks.
Starting with the background theory, fuel tank insulation techniques are described, for use in lengthy space missions. This is followed by details of test equipment constructed and the results obtained in measuring the relative effectiveness of superinsulation. (Germany) E Mueller et al, Rep DGRR/ WGLR 66-043; EV-59-0, Sept 1966, 38 pages (in German) 18. GASEOUS
(Sci Tech Aerospace
18 : 32 Translational energy distribution of electrons and positive ions in the plasma of microwave and high frequency discharge of He, Ne and Ar. See abstracts number 1409. 18 1338. Interaction between charged particle beams and surface waves in plasma. (USSR) The interaction of a plasma with a small density electron beam moving parallel to the plasma surface outside the plasma is theoretically investigated. The possibility of microwave generation in millimetre and submillimetre bands is demonstrated. V I Pakhomov and K N Stepanov, Zh Tekh Fiz, 38 (5), May 1968, (in Russian).
18 : 21 1339. Power distribution between electrodes in a Penning discharge. (USSR) A device simulating a conventional sputter-ion pump was used and the heat produced on the anode and both cathodes was measured. The anode power is higher by 50 per cent at 1O-6 torr and by 150 per cent at 5x 10e4 torr than the cathodes power. Measurements on NEM-100 pump verified these results. This effect is explained by the elastic reflection of ions from the cathode to the anode. E M Rudnitskiy, Zh Tekh Fiz, 38 (5), May 1968, 830-832 (in Russian). 18 of discharge
in a non-cylindrical
Z-pinch.
(USSR) The initial stage of discharge in a non-cylindrical Z-punch is investigated theoretically and experimentally in deuterium. Yu A Kolesnikov, Zh Tekh Fiz, 38 (5), May 1968, 833-842 (in Russian). 1341. Instability of a beam-plasma magnetic trap. (USSR)
discharge
at low pressure
18 in a
Exoerimental investigations were carried out to determine instabilities in plasma produced by a 0.2-5 keV electron beam with current up to 0.1 A, under a magnetic field of 600 to 4000 Oe and at 1.5 to 5 X 10 G torr. Two regimes of the plasma were observed and the transition from the first to the second regime is accompanied by strong low frequency oscillations. V G Marinin, Zh Tekh Fiz, 38 (5), May 1968, 843-845 (in Russian). 18 : 19 1342. Comparative investigations of arc and high frequency discharges used in neon-helium lasers. (USSR)
Parameters of arc and 30 MHz discharges have been measured in Ne, 574
18 1344. Initiating vacuum breakdown in the presence of microdischarges.
(USSR) From simultaneous determinations of microdischarges and the time of breakdown initiation between copper electrodes, at 10e6 to IO-’ torr and with voltage continuously increasing to 90 kV, it was concluded that no direct correlation exists between the microdischarge current (or even the presence or absence of microdischarges) and the breakdown initiation. I N Slivkov, Zh Tekh Fir, 38 (5), May 1968, 884-887 (in Russian). 1345. Influence of microwave field on the negative characteristics in a helium glow discharge. (USSR)
ELECTRONICS
1340. On the development
(USSR)
Al and Pb targets were irradiated by a single light pulse of energy 3.5 J and pulse width, 50 nsec, at pressures of IO-’ to 10e4 torr. From measurements of the electron current emitted from the plasma and consideration of the space charge and plasma divergence, a plasma temperature of about la5 “K was derived. The dense plasma produced above the target absorbed the laser radiation. S I Andreev et al, Zh Tekh Fiz, 38 (5), May 1968, 874883 (in Russian).
Reps, 6 (5), 762, N68-13966).
18 : 16 Field emission microscope study of niobium surface diffusion in a high electric field. See abstract number 1329.
796-805
He and He-Ne mixture at 0.4 to 8 torr and no significant difference in laser output was found. N I Krindach and L N Tunitskiy, Zh Tekh Fiz, 38 (5), May 1968, 865-870 (in Russian). 18 1343. Thermoelectron emission and divergence of plasma produced under the action of a focused single laser pulse on a solid target.
glow
18 plasma
The influence of microwave energy of 20 W on a glow discharge with a current of 0.8 mA, in helium at a pressure of 1 torr, was measured. Tn negative glow plasma the electron energy was increased but their density was decreased. G S Solntsev et al, Zh Tekh Fiz, 38 (5), May 1968, 893-896 (in Russian).
18 1346. On the theory of low voltage arcs in short gaseous gaps. (USSR) The theory of low voltage arcs in short gaps is aresented and conditions typical for caesium thermionic converters are discussed in detail. A F Nastoyashchiy, Zh Tekh Fiz, 38 (5), May 1968, 902-913 (in Russian). 18 1347. The electron energy distribution in neon high frequency discharge.
(USSR) Measurements of neon hf discharge at currents of 50 to 150 mA indicated that, at 5 x 10m2torr, the energy distribution is similar to the Maxwellian distribution, but at pressures of 0.25 to I torr some deviations, caused by a deficiency of fast electrons, were observed. S D Vagner et al, Zh Tekh Fir, 38 (5), May 1968,930-93 1 (in Russian). 18 1348. Comparison of probe and optical methods of measurement of a low temperature caesium plasma. (USSR) A spectroscopic method is described for investigation of the work
regime in a thermionic converter with caesium vapour at pressures of 0.4 to 2 torr. The results are compared to those obtained by a probe method. G A Dyuzhev et al, Zh Tekh Fiz, 38 (6), June 1968, 963-967 (in Russian). 1349. On the structure of plasma clots in a coaxial injector.
18 (USSR)
Deuterium plasma produced by a coaxial injector was investigated by diamagnetic and microwave probes, by a thermoprobe, by an optical spectroscope and by a Thomson mass spect;ometer.-The plasma decayed into two plasmoids. The first, containing fast particles, had more than 20 per cent of impurities, mostly from decomposed oil vapours. The second plasmoid moved at a lower speed. V I Vasil’ev et al, Z/1 Tekh Fiz, 38 (6), June 1968, 991-996 (in Russian). 1350. Experimental proof of the equivalent pressure concept in an arc discharge with a hot cathode in mercury vapour. (USSR)
The equivalent pressure concept states that the effect of a magnetic field on an arc discharge is the same as that of a rise in pressure. This was demonstrated by measurement of the characteristics of the mercury vapour rectifier, GRI-0.25/1.5, and the thyratron TR-212
abstracts
1335-1350
1335. Practical influences insulation. (USA)
on thermal
design
17 : 34 of high performance
The thermal aspects of a helium-purged 6.35 micron aluminized mylar insulation system applied to a 2.67 m diameter tank, and future requirements and approaches are discussed. Graphic data on the thermal conductivity of insulation materials as a function of helium gas pressure is presented. E H Hyde, in Rep NASA-TM-X-35670, Aerospace Reps, 6 (5), 756, N68-14653).
1967, Vol. 2, 3-27 (Sri Tech
17 : 34 1336. Assessment of the status of cryogenic insulation development. (USA) Research effort for high performance insulation development for
space application during 1960-1967, and project requirement efforts for the time frame 1967-I 970 are graphically depicted and discussed. C C Wood, Rep NASA-TM-X35670, 1967, Vol. 2, 81-83 (Sri Tech Aerospace
Reps, 6 (5), 756, N68-14658).
1337. Measurement (USA)
17 : 34 of heat flow in the insulation of cryogenic fuel tanks.
Starting with the background theory, fuel tank insulation techniques are described, for use in lengthy space missions. This is followed by details of test equipment constructed and the results obtained in measuring the relative effectiveness of superinsulation. (Germany) E Mueller et al, Rep DGRR/ WGLR 66-043; EV-59-0, Sept 1966, 38 pages (in German) 18. GASEOUS
(Sci Tech Aerospace
18 : 32 Translational energy distribution of electrons and positive ions in the plasma of microwave and high frequency discharge of He, Ne and Ar. See abstracts number 1409. 18 1338. Interaction between charged particle beams and surface waves in plasma. (USSR) The interaction of a plasma with a small density electron beam moving parallel to the plasma surface outside the plasma is theoretically investigated. The possibility of microwave generation in millimetre and submillimetre bands is demonstrated. V I Pakhomov and K N Stepanov, Zh Tekh Fiz, 38 (5), May 1968, (in Russian).
18 : 21 1339. Power distribution between electrodes in a Penning discharge. (USSR) A device simulating a conventional sputter-ion pump was used and the heat produced on the anode and both cathodes was measured. The anode power is higher by 50 per cent at 1O-6 torr and by 150 per cent at 5x 10e4 torr than the cathodes power. Measurements on NEM-100 pump verified these results. This effect is explained by the elastic reflection of ions from the cathode to the anode. E M Rudnitskiy, Zh Tekh Fiz, 38 (5), May 1968, 830-832 (in Russian). 18 of discharge
in a non-cylindrical
Z-pinch.
(USSR) The initial stage of discharge in a non-cylindrical Z-punch is investigated theoretically and experimentally in deuterium. Yu A Kolesnikov, Zh Tekh Fiz, 38 (5), May 1968, 833-842 (in Russian). 1341. Instability of a beam-plasma magnetic trap. (USSR)
discharge
at low pressure
18 in a
Exoerimental investigations were carried out to determine instabilities in plasma produced by a 0.2-5 keV electron beam with current up to 0.1 A, under a magnetic field of 600 to 4000 Oe and at 1.5 to 5 X 10 G torr. Two regimes of the plasma were observed and the transition from the first to the second regime is accompanied by strong low frequency oscillations. V G Marinin, Zh Tekh Fiz, 38 (5), May 1968, 843-845 (in Russian). 18 : 19 1342. Comparative investigations of arc and high frequency discharges used in neon-helium lasers. (USSR)
Parameters of arc and 30 MHz discharges have been measured in Ne, 574
18 1344. Initiating vacuum breakdown in the presence of microdischarges.
(USSR) From simultaneous determinations of microdischarges and the time of breakdown initiation between copper electrodes, at 10e6 to IO-’ torr and with voltage continuously increasing to 90 kV, it was concluded that no direct correlation exists between the microdischarge current (or even the presence or absence of microdischarges) and the breakdown initiation. I N Slivkov, Zh Tekh Fir, 38 (5), May 1968, 884-887 (in Russian). 1345. Influence of microwave field on the negative characteristics in a helium glow discharge. (USSR)
ELECTRONICS
1340. On the development
(USSR)
Al and Pb targets were irradiated by a single light pulse of energy 3.5 J and pulse width, 50 nsec, at pressures of IO-’ to 10e4 torr. From measurements of the electron current emitted from the plasma and consideration of the space charge and plasma divergence, a plasma temperature of about la5 “K was derived. The dense plasma produced above the target absorbed the laser radiation. S I Andreev et al, Zh Tekh Fiz, 38 (5), May 1968, 874883 (in Russian).
Reps, 6 (5), 762, N68-13966).
18 : 16 Field emission microscope study of niobium surface diffusion in a high electric field. See abstract number 1329.
796-805
He and He-Ne mixture at 0.4 to 8 torr and no significant difference in laser output was found. N I Krindach and L N Tunitskiy, Zh Tekh Fiz, 38 (5), May 1968, 865-870 (in Russian). 18 1343. Thermoelectron emission and divergence of plasma produced under the action of a focused single laser pulse on a solid target.
glow
18 plasma
The influence of microwave energy of 20 W on a glow discharge with a current of 0.8 mA, in helium at a pressure of 1 torr, was measured. Tn negative glow plasma the electron energy was increased but their density was decreased. G S Solntsev et al, Zh Tekh Fiz, 38 (5), May 1968, 893-896 (in Russian).
18 1346. On the theory of low voltage arcs in short gaseous gaps. (USSR) The theory of low voltage arcs in short gaps is aresented and conditions typical for caesium thermionic converters are discussed in detail. A F Nastoyashchiy, Zh Tekh Fiz, 38 (5), May 1968, 902-913 (in Russian). 18 1347. The electron energy distribution in neon high frequency discharge.
(USSR) Measurements of neon hf discharge at currents of 50 to 150 mA indicated that, at 5 x 10m2torr, the energy distribution is similar to the Maxwellian distribution, but at pressures of 0.25 to I torr some deviations, caused by a deficiency of fast electrons, were observed. S D Vagner et al, Zh Tekh Fir, 38 (5), May 1968,930-93 1 (in Russian). 18 1348. Comparison of probe and optical methods of measurement of a low temperature caesium plasma. (USSR) A spectroscopic method is described for investigation of the work
regime in a thermionic converter with caesium vapour at pressures of 0.4 to 2 torr. The results are compared to those obtained by a probe method. G A Dyuzhev et al, Zh Tekh Fiz, 38 (6), June 1968, 963-967 (in Russian). 1349. On the structure of plasma clots in a coaxial injector.
18 (USSR)
Deuterium plasma produced by a coaxial injector was investigated by diamagnetic and microwave probes, by a thermoprobe, by an optical spectroscope and by a Thomson mass spect;ometer.-The plasma decayed into two plasmoids. The first, containing fast particles, had more than 20 per cent of impurities, mostly from decomposed oil vapours. The second plasmoid moved at a lower speed. V I Vasil’ev et al, Z/1 Tekh Fiz, 38 (6), June 1968, 991-996 (in Russian). 1350. Experimental proof of the equivalent pressure concept in an arc discharge with a hot cathode in mercury vapour. (USSR)
The equivalent pressure concept states that the effect of a magnetic field on an arc discharge is the same as that of a rise in pressure. This was demonstrated by measurement of the characteristics of the mercury vapour rectifier, GRI-0.25/1.5, and the thyratron TR-212