Hi My guess is that you're already stuck with ultra pure gas to get it working as a maser.
Bob On Sep 1, 2010, at 8:40 PM, Robert Darlington <rdarling...@gmail.com> wrote: > And cryo means ultra high purity helium. I learned about that the hard > way. They don't like pumping gravel (solidified trace amounts of oxygen, > argon, etc.) > > -Bob > > On Wed, Sep 1, 2010 at 5:37 PM, J. Forster <j...@quik.com> wrote: > >> Yup. If you do use oil, you need an LN2 trap. >> >> -John >> >> =============== >> >>> Hi >>> >>> My guess is that you either need a cryo pump or ion pumps and a very good >>> seal. >>> >>> Bob >>> >>> >>> >>> On Sep 1, 2010, at 5:15 PM, Robert Darlington <rdarling...@gmail.com> >>> wrote: >>> >>>> You can pickup oil diffusion pumps pretty inexpensively. They're not >>>> quite >>>> ion pumps but they get you way down there and they're fast. With proper >>>> traps you don't really have to worry about coating your experimental >>>> physics >>>> package with oil. They're cheap to run and easy to maintain. Ion pumps >>>> are >>>> about as simple as things get and could probably be made very easily by >>>> some >>>> of us "vacuum-nuts" but I never had the need. Turbo pumps probably >>>> won't do >>>> the job and they're expensive and unforgiving. Not only did one of mine >>>> crash, it crashed when a sputtering gun melted through. 80,000 RPM >>>> spinning >>>> foil blades don't like hitting the gun cooling water very much! >>>> >>>> Good luck! >>>> >>>> -Bob >>>> >>>> On Wed, Sep 1, 2010 at 2:30 PM, Chris Howard <ch...@elfpen.com> wrote: >>>> >>>>> >>>>> >>>>> Given the quality of vacuum the manual seems to imply, I'm guessing >>>>> this >>>>>> wont cut it. I'll bet that even low impurity Teflon has a long >>>>>> bakeout >>>>>> period. >>>>>> >>>>>> >>>>> Too bad they don't have some kind of "getter" to allow lower vacuum >>>>> specs. >>>>> I expect they thought of that. >>>>> >>>>> The thing does sound like a giant hydrogenated vacuum tube. >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.