Discussion on Optimization of Large Oil-Pumped Ultra-High Vacuum Systems

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Discussion is directed toward eventual optimization of the largest diffusion-pump systems. Less than 100 diffusion pump fluid molecules per cm/sup 2//sec are possible to detect using an accumulation method. Optimization discussed demands highest possible system speed compatible with the above contamination rate. Bakeable oil diffusion pump systems, with equal orifice valve-trap units, without conventioual baffling, permit theoretical throughput speeds up to 0.3 of the system orifice. The average backstreaming rate of oil in two unconventionally baffled commercial pumps of 6- and 10-in. size is reduced to <3 x lO/sup -4/ g/cm/sup 2//24 hr, including heating and cooling the pump boiler. ... continued below

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19 p.

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Milleron, N. & Levenson, L. L. September 12, 1960.

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Description

Discussion is directed toward eventual optimization of the largest diffusion-pump systems. Less than 100 diffusion pump fluid molecules per cm/sup 2//sec are possible to detect using an accumulation method. Optimization discussed demands highest possible system speed compatible with the above contamination rate. Bakeable oil diffusion pump systems, with equal orifice valve-trap units, without conventioual baffling, permit theoretical throughput speeds up to 0.3 of the system orifice. The average backstreaming rate of oil in two unconventionally baffled commercial pumps of 6- and 10-in. size is reduced to <3 x lO/sup -4/ g/cm/sup 2//24 hr, including heating and cooling the pump boiler. A Ho facter of> 0.4 is maintained. Results on trapping with activated alumiua, retained by a wire mesh, at both liquid-nitrogen and room temperature are included. A variety of pumping speed measurements and bakeable combination valve-trap units is discussed. (auth)

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19 p.

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NTIS

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  • Other Information: Orig. Receipt Date: 31-DEC-61

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  • Report No.: UCRL-5597
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/4100899 | External Link
  • Office of Scientific & Technical Information Report Number: 4100899
  • Archival Resource Key: ark:/67531/metadc870949

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 12, 1960

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 12, 2017, 2:51 p.m.

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Milleron, N. & Levenson, L. L. Discussion on Optimization of Large Oil-Pumped Ultra-High Vacuum Systems, report, September 12, 1960; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc870949/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.