This article really sucks

Discussion in 'General Technical Questions and Answers' started by KL7AJ, Dec 2, 2019.

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  1. KL7AJ

    KL7AJ XML Subscriber QRZ Page

    If you've been wondering how folks achieve really high vacuums, this is a good overview. Seen most of these at one time or another in the plasma lab
  2. KL7AJ

    KL7AJ XML Subscriber QRZ Page

  3. ND6M

    ND6M Ham Member QRZ Page

    Gee, it kinda stops at about 1950 and 10-8 Torr.
    Other than that, it was an interesting article.

    We routinely pulled to 10-15 Torr using diffusion pumps on tubes in an oven at 850 degrees in the glass room at Datagraphics.
    That was in the early 90's
  4. WJ4U

    WJ4U Ham Member QRZ Page

    Dyson not a contender?
  5. KL7AJ

    KL7AJ XML Subscriber QRZ Page

    Yeah, we used oil diffusion pumps in the UCLA plasma lab...forgot how low they went. What's really interesting is just how recent high vacuum technology is.
  6. KL7AJ

    KL7AJ XML Subscriber QRZ Page

    The sprengel pump really is a cool concept.
  7. N3PM

    N3PM Ham Member QRZ Page

    Used a Veeco helium leak tester about 45 years ago. The group leader would spaz whenever someone "cracked" the oil in the diffusion pump. Nasty smelling oil, it was. Thanks for some more memories.
    Mike N3PM
  8. K8MHZ

    K8MHZ Ham Member QRZ Page

    Also used them at the R&D lab for a jet engine parts manufacturing facility in the early 80's
  9. KL7AJ

    KL7AJ XML Subscriber QRZ Page

    I always thought diffusion oil smelled like popcorn. Maybe they changed the formulation since 1975
  10. KH6AQ

    KH6AQ Ham Member QRZ Page

    The article is out of date but is a fun historical reference up to the middle of the last century.

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