In the case of the Hickman pump (an early form of multistage diffusion pump) oil is used as the diffusion fluid. In operation: The vacuum tube they're trying to evacuate is hooked up to the …

They function as an additional stage between the system to be evacuated at one end, and a mechanical vacuum pump at the other end. Diffusion pumps are a critical technology for …

While Gaede1 and Langmuir• held that there is theoretically no limit to the vacuum produced by a diffusion pump, Hickman•.• reported that the limit of pumping is set at the vapour pressure of...

2010年10月4日 · Ultimate pressure vs input characteristics of a Hickman pump, containing Octoil-S and DC-705 as working fluids, have been observed as a function of an operating period and …

なえてHickman pump を試作した。 拡散ポンプ油としては或る温度範囲で,適当な蒸気圧を有し, 且つ,その温度範囲では,分解しないことが要求去れるが,トラッ

Eruptive boiling of pump fluid, which causes pressure fluctuations in high and ultrahigh vacuum systems, has been thoroughly eliminated by a newly developed diffusion pump boiler, named …

ヒックマンポンプ[Hickman pump] ガラス製の分留型油拡散ポンプで K. C. D. Hickman により考案（1936）された。 排気作動中に自動的に油の分留精製を行うことによって、油の劣化と …

2004年12月27日 · A six‐stage oil diffusion pump is described, using ordinary lubricating oil which is fractionally distilled in the pump so that a vacuum of 10 −6 mm can be obtained without the …

ヒックマンポンプ (Hickman pump) は油を用いた拡散ポンプに分類される真空ポンプの一種で、全体がガラスで出来ていることが特徴である。1936年にK. 1936年にK.

A mixed pump filling can be put to great advantage in a multi-stage pump because the lower boiling fractions do most of the pumping at high pressure while the phlegmatic fractions …