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312. Spectroscopic plasma research in a device with the rod gun “DP”. Measurements of plasma temperature
Classified
abstracts
310-324
by means apertures.
of electrodes
in the main lens which
have elliptical
R G Hntter, Rep ECOM-02449-I ; AD-65271 8, April 1967. (US Govt Res Develop Reps, 67 (15). 1967, 71). 310. Investigation (USA)
and development
of semiconductor-metal
I5 pages 33 cathodes.
Vacuum cleaved, atomically clean contact interfaces are studied. It is found that the Schottky barrier heights for such metal-semiconductor contacts decrease slightly and monotonically with metal work function and show no significant dependence on the chemical nature of the metal. Reasons for the practicality of the metal-semiconductor cathodes are discussed. L S Lerner et al, Rep AFCRL-67-0296, AD-653 190, April 1967, 60 pages (US Govt Res Develop Reps, 67 (15), 1967, 72). 33 311. Digitized spark chambers in high energy physics. (USA)
The properties of digitized wire spark chamber systems are compared to alternative techniques for track determination. The angular and momentum resolution in chamber arrays attainable in experiments is presented, including the operation of spark chambers at 0.1 atm pressure for the reduction of multiple scattering in the system. J Fischer, Rep BNL-1103 1, 1967. 63 pages (Sri Tech Aerospare Reps. 5 (15), 2-51 2751, N67-27913). 33 312. Spectroscopic plasma reseach in a device with the rod gun “DP”. Measurements of plasma temperature. (Poland) Results are presented of measurements of electron and ion temperatures in the rod guns DP-1 and DP-I I. It was observed that the ion temperature increases together with an increase of the ion charge, but an increment of the initial pressure in the discharge chamber causes a decrease of the ion temperature. S Snckewer, Rep INR-7 IS/ X VIIijPP, June 1966, 74 pages (in Polish) (Sri Tech Aerospace
Reps, 5 (15), 2775, N67-28589).
33 : 63 313. Bibliography on the high temperature chemistry and physics of gases and plasmas. (USA) A listing is given of 87 papers dealing with spectroscopy of interest in
high-temperature chemistry. In addition, a listing is given of 11 1 papers on reactions between gases and condensed phases. L Brewer, Rep NP-16583, Dee 1966. 23 pages (Sri Tech Aerospace Reps, 5 (16), 2953, N67-29336). 33 314. A vacuum integrating sphere for in situ reflectance measurements at 77°K from 0.5 to 10 microns. (USA)
A modified integrating sphere is described, which can be used for in situ reflectance measurements of low temperature surfaces under vacuum conditions. The techniques employed in measuring the spectral reflectance of CO, cryodeposits are discussed. B A McCullough et al, Rep AEDC-TR-67-I 0; A D-650072, April 1967, 27 pages (Sci Tech Aerospace 315. Documentation
Reps, 5 (l6), 2896, N67-29654).
of plasma physics;
experimental
33 : 63 and theoretical.
(Germany) A listing is presented of 406 papers dealing with all aspects of plasma research. Subject and author indexes are included. D Hilsenheck, Rep A ED-C-03-04, Jan 1967 152 pages (Sci Tech Aerospace Reps, 5 (16), 2954, N67-29706). 33 316. Differential recombination chamber. (Poland)
The dependence of the volt-ampere characteristics of an ionization chamber on the linear energy loss of the particle producing the ionization is used to determine the factor of merit or the Q factor of mixed radiation. A chamber for such measurements is described which has 25 electrodes of 3 mm placed at a distance of 7 mm from each other. M Zelchinskii and K Kharnovetskii, Rep INR-?39/XIX/D Ju1.v 1966, 18 pages (Sci Tech Aerospace Reps, 5 (I 6), 2896, N67-29725) (itz Russian). 33 : 32 317. Search for plasma oscillations stimulated by a pre-bunched electron beam from the linear accelerator. (USA)
An experiment is described in which the electron beam from the linear accelerator was passed through an argon plasma to discover whether microwave oscillations could be detected outside the discharge vessel. J S Mendell and E H Holt, Rep NASA-CR-819; TR-67-2, Jul_v 1967, 55 pages (Sci Tech Aerospace Reps, 5 (16). 2956, N67-29999). 104
33 318. A vacuum ultraviolet source. A low inductance three-electrode
(USA)
spark source for the vacuum ultraviolet fed by a 20 kV, I3 Itf capacitor is described. Its main feature is its ability to generate spectra of very high degrees of ionization. U Feldman et al, Rep NASA-TM-X-55823; X-614-273; June 1967, 13 pages (Sri Tech Aerospace Reps, 5 (16). 2940, N6?-30149). 34. HIGH
ALTITUDE
Low temperature
AND SPACE
TECHNOLOGY
techniques and aeronautics.
34 : I? See abstract number 210.
34 for satellites at the European Space Technology Centre (ESTEC). (Germany) In the last two years, five large vacuum chambers have been installed at ESTEC, Noordwijk, Netherlands, for satellite testing. The two largest chambers, HBF2 and HBF3, are described in detail. Satellites of two and three metres diameter, respectively, may be tested under simulated space conditions, including solar beams. Rotary mechanical and Roots pumps are employed for the forevacuum and oil diffusion pumps combined with cryopumping provide ultimate pressures below 1O-’ after 24 hours. Backstreaming is prevented by a combined watercooled and liquid nitrogen-cooled baffle. Some experiences acquired during satellite testing are discussed. H A Schultz and E H Classen, Vakrrlrnz-Te~llni, 16 ( IO). Dec. 1967, 233-243 (in German).
319. Heat balance test facilities
34 320. Ultrahigh
(USA) Adhesion and friction between surfaces in ultrahigh vacuum are being measured to determine the magnitude and nature of the forces acting between the particles of a granular material such as soil. Forces between grains in a powder were found by measuring the force between a simple pair of surfaces of known gross contour in order to minimize the number of parameters. Magnitude, range and dependence on surface cleanliness exhibited by the forces were used to evaluate the various mechanisms proposed to account for adhesion forces. For load smaller than 4000 grams, no adhesion was observed which may indicate load dependence of adhesion. Increase in friction in ultrahigh vacuum is probably due to cleaning of the surfaces as wear proceeds rather than to roughening of the surfaces. vacuum adhesion and friction.
E S Gall and J H Hubbard, Rep AD-634678, Aug 1966, lopages Tech Aerospace Reps, 5 (I 5), 2751, N67-27957). 321. Some aspects of thermal model testing in space chambers.
(Sci
34 (USA)
Various facets of thermal testing of space vehicles in cold vacuum chambers, with and without solar simulation, are discussed. Emphasis is on thermal modelling of spacecraft, which is discussed for the case of simultaneous preservation of temperature, material and surface properties. K W Nutt and A van der Bliek, Rep AEDC-TR-67-38; AD-650814, April 1967, 30 pages (Sci Tech Aerospace Reps, 5 (16). 2983, N6728987). 34 : 63 322. Ion and plasma propulsion research. (USA)
The report contains the summaries of the papers presented at the tenth annual AFOSR contractor’s meeting on ion and plasma propulsion research. Anon, Gerleral Dynamics Rep AFOSR-67-0894; A D-651 149, April 1967, 47 pages (Sri Tech Aerospace Reps, 5 (16). 2962, N67-29060). 34 323. Procedures for precise determination of thermal radiation properties. (USA)
The objective of the study was to develop equipment and procedures for measuring the important thermal radiation properties of materials, particularly those used in space vehicles, at temperatures up to the melting point of the most refractory materials. J C Richmond et al, Rep NBS-TN-292; AD-649694, Feb 1967, 88 pqpes (Sri Tech Aerospace
Reps, 5 (16), 2984, N6?-29416).
34 324. Space environment criteria guidelines for use in space vehicle development. (USA) A cross section of space environmental data is presented for use as
design criteria guidelines in space vehicle development programmes and advanced studies related to future NASA programmes. The data
abstracts
310-324
by means apertures.
of electrodes
in the main lens which
have elliptical
R G Hntter, Rep ECOM-02449-I ; AD-65271 8, April 1967. (US Govt Res Develop Reps, 67 (15). 1967, 71). 310. Investigation (USA)
and development
of semiconductor-metal
I5 pages 33 cathodes.
Vacuum cleaved, atomically clean contact interfaces are studied. It is found that the Schottky barrier heights for such metal-semiconductor contacts decrease slightly and monotonically with metal work function and show no significant dependence on the chemical nature of the metal. Reasons for the practicality of the metal-semiconductor cathodes are discussed. L S Lerner et al, Rep AFCRL-67-0296, AD-653 190, April 1967, 60 pages (US Govt Res Develop Reps, 67 (15), 1967, 72). 33 311. Digitized spark chambers in high energy physics. (USA)
The properties of digitized wire spark chamber systems are compared to alternative techniques for track determination. The angular and momentum resolution in chamber arrays attainable in experiments is presented, including the operation of spark chambers at 0.1 atm pressure for the reduction of multiple scattering in the system. J Fischer, Rep BNL-1103 1, 1967. 63 pages (Sri Tech Aerospare Reps. 5 (15), 2-51 2751, N67-27913). 33 312. Spectroscopic plasma reseach in a device with the rod gun “DP”. Measurements of plasma temperature. (Poland) Results are presented of measurements of electron and ion temperatures in the rod guns DP-1 and DP-I I. It was observed that the ion temperature increases together with an increase of the ion charge, but an increment of the initial pressure in the discharge chamber causes a decrease of the ion temperature. S Snckewer, Rep INR-7 IS/ X VIIijPP, June 1966, 74 pages (in Polish) (Sri Tech Aerospace
Reps, 5 (15), 2775, N67-28589).
33 : 63 313. Bibliography on the high temperature chemistry and physics of gases and plasmas. (USA) A listing is given of 87 papers dealing with spectroscopy of interest in
high-temperature chemistry. In addition, a listing is given of 11 1 papers on reactions between gases and condensed phases. L Brewer, Rep NP-16583, Dee 1966. 23 pages (Sri Tech Aerospace Reps, 5 (16), 2953, N67-29336). 33 314. A vacuum integrating sphere for in situ reflectance measurements at 77°K from 0.5 to 10 microns. (USA)
A modified integrating sphere is described, which can be used for in situ reflectance measurements of low temperature surfaces under vacuum conditions. The techniques employed in measuring the spectral reflectance of CO, cryodeposits are discussed. B A McCullough et al, Rep AEDC-TR-67-I 0; A D-650072, April 1967, 27 pages (Sci Tech Aerospace 315. Documentation
Reps, 5 (l6), 2896, N67-29654).
of plasma physics;
experimental
33 : 63 and theoretical.
(Germany) A listing is presented of 406 papers dealing with all aspects of plasma research. Subject and author indexes are included. D Hilsenheck, Rep A ED-C-03-04, Jan 1967 152 pages (Sci Tech Aerospace Reps, 5 (16), 2954, N67-29706). 33 316. Differential recombination chamber. (Poland)
The dependence of the volt-ampere characteristics of an ionization chamber on the linear energy loss of the particle producing the ionization is used to determine the factor of merit or the Q factor of mixed radiation. A chamber for such measurements is described which has 25 electrodes of 3 mm placed at a distance of 7 mm from each other. M Zelchinskii and K Kharnovetskii, Rep INR-?39/XIX/D Ju1.v 1966, 18 pages (Sci Tech Aerospace Reps, 5 (I 6), 2896, N67-29725) (itz Russian). 33 : 32 317. Search for plasma oscillations stimulated by a pre-bunched electron beam from the linear accelerator. (USA)
An experiment is described in which the electron beam from the linear accelerator was passed through an argon plasma to discover whether microwave oscillations could be detected outside the discharge vessel. J S Mendell and E H Holt, Rep NASA-CR-819; TR-67-2, Jul_v 1967, 55 pages (Sci Tech Aerospace Reps, 5 (16). 2956, N67-29999). 104
33 318. A vacuum ultraviolet source. A low inductance three-electrode
(USA)
spark source for the vacuum ultraviolet fed by a 20 kV, I3 Itf capacitor is described. Its main feature is its ability to generate spectra of very high degrees of ionization. U Feldman et al, Rep NASA-TM-X-55823; X-614-273; June 1967, 13 pages (Sri Tech Aerospace Reps, 5 (16). 2940, N6?-30149). 34. HIGH
ALTITUDE
Low temperature
AND SPACE
TECHNOLOGY
techniques and aeronautics.
34 : I? See abstract number 210.
34 for satellites at the European Space Technology Centre (ESTEC). (Germany) In the last two years, five large vacuum chambers have been installed at ESTEC, Noordwijk, Netherlands, for satellite testing. The two largest chambers, HBF2 and HBF3, are described in detail. Satellites of two and three metres diameter, respectively, may be tested under simulated space conditions, including solar beams. Rotary mechanical and Roots pumps are employed for the forevacuum and oil diffusion pumps combined with cryopumping provide ultimate pressures below 1O-’ after 24 hours. Backstreaming is prevented by a combined watercooled and liquid nitrogen-cooled baffle. Some experiences acquired during satellite testing are discussed. H A Schultz and E H Classen, Vakrrlrnz-Te~llni, 16 ( IO). Dec. 1967, 233-243 (in German).
319. Heat balance test facilities
34 320. Ultrahigh
(USA) Adhesion and friction between surfaces in ultrahigh vacuum are being measured to determine the magnitude and nature of the forces acting between the particles of a granular material such as soil. Forces between grains in a powder were found by measuring the force between a simple pair of surfaces of known gross contour in order to minimize the number of parameters. Magnitude, range and dependence on surface cleanliness exhibited by the forces were used to evaluate the various mechanisms proposed to account for adhesion forces. For load smaller than 4000 grams, no adhesion was observed which may indicate load dependence of adhesion. Increase in friction in ultrahigh vacuum is probably due to cleaning of the surfaces as wear proceeds rather than to roughening of the surfaces. vacuum adhesion and friction.
E S Gall and J H Hubbard, Rep AD-634678, Aug 1966, lopages Tech Aerospace Reps, 5 (I 5), 2751, N67-27957). 321. Some aspects of thermal model testing in space chambers.
(Sci
34 (USA)
Various facets of thermal testing of space vehicles in cold vacuum chambers, with and without solar simulation, are discussed. Emphasis is on thermal modelling of spacecraft, which is discussed for the case of simultaneous preservation of temperature, material and surface properties. K W Nutt and A van der Bliek, Rep AEDC-TR-67-38; AD-650814, April 1967, 30 pages (Sci Tech Aerospace Reps, 5 (16). 2983, N6728987). 34 : 63 322. Ion and plasma propulsion research. (USA)
The report contains the summaries of the papers presented at the tenth annual AFOSR contractor’s meeting on ion and plasma propulsion research. Anon, Gerleral Dynamics Rep AFOSR-67-0894; A D-651 149, April 1967, 47 pages (Sri Tech Aerospace Reps, 5 (16). 2962, N67-29060). 34 323. Procedures for precise determination of thermal radiation properties. (USA)
The objective of the study was to develop equipment and procedures for measuring the important thermal radiation properties of materials, particularly those used in space vehicles, at temperatures up to the melting point of the most refractory materials. J C Richmond et al, Rep NBS-TN-292; AD-649694, Feb 1967, 88 pqpes (Sri Tech Aerospace
Reps, 5 (16), 2984, N6?-29416).
34 324. Space environment criteria guidelines for use in space vehicle development. (USA) A cross section of space environmental data is presented for use as
design criteria guidelines in space vehicle development programmes and advanced studies related to future NASA programmes. The data