Capture Coefficients of Gases at 77°K

Brown, R. F.; Wang, E. S. J.

doi:10.1007/978-1-4684-3108-7_34

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…Three gases were used: H 2 0, with a capture coefficient on 77°K surface of 0.9 10 ; CHC1 3 , with 0.95; and S0 2 with O.8. 11 The water vapor system allowed distilled water to gravity-feed through a Rotameter to a needle valve. The water, as it left this valve, was exposed to a pressure of a few millimeters of mercury in the line connecting the valve to the chamber.…”

Section: Methodsmentioning

confidence: 99%

An experimental study of space chamber molecular kinetics.

Cheeseman

1966

Journal of Spacecraft and Rockets

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Increased simulation of the near perfect molecular sink found in space is desirable for present and future space chambers. However, the parameter pressure as conventionally defined is an inadequate means of expressing simulation fidelity in such chambers. An experiment was conducted to illustrate the importance of molecular flux upon simulation fidelity and to show the effects of various gases and chamber geometries upon the chamber molecular flux profiles. The experimental results were compared to a theoretical flux profile calculation. Good agreement was obtained in the definition of molecular fluxes upon a centrally suspended vehicle; differences between theory and experiment were observed in the flux profiles near a solar simulator in the chamber wall. The conclusions reached from the study were integrated with previous work in space chamber molecular kinetics.

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Section: Methodsmentioning

confidence: 99%

An experimental study of space chamber molecular kinetics.

Cheeseman

1966

Journal of Spacecraft and Rockets

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“…Another characteristic observed in superconducting coils was the large remanent field remaining in the bore of the coil after the current had been reduced to zero (Aron 1964, Donadieu andLeroux 1965). This was generally larger with Nb-Ti than with Nb-Zr and often reached several hundred oersteds (figure 10).…”

Section: Early Experience With Superconducting Coilsmentioning

confidence: 99%

Superconducting magnets

Chester¹

1967

Rep. Prog. Phys.

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T h e properties of practical high-field' superconductors are outlined and related to the theory of type I1 superconductors. Their unexpected and disappointing behaviour when first wound into coils for the production of high fields is described. This problem is shown to arise from the nature of the current distribution in such materials and the consequent dissipation under conditions of changing current. The factors affecting this dissipation and the thermal stability of the materials are discussed together with means for achieving stable operationin particular the use of composite conductors. Some of the engineering problems associated with the further development of large superconducting magnets are set out; for example, protection against burn-out, the support of the large forces developed and the introduction of current to the magnet. The article concludes with a brief description of some currently planned superconducting magnets, their applications and their economics.

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