Search found 304 matches

by Roberto Ferrari
Sat Mar 28, 2020 1:23 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V construction - the process long running
Replies: 48
Views: 19182

Re: Fusor V construction - the process long running

Richard
I am a bit confused about the image of your HV feedthrough.
The CF flange (a Varian one) seems to lack the sharp edge to seal against the copper washer.
Please comment.
Roberto
by Roberto Ferrari
Mon Mar 23, 2020 12:50 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Window dressing - Trying to clean view port glass
Replies: 5
Views: 1691

Re: Window dressing - Trying to clean view port glass

Hi Richard, a useful technique to removing tungsten deposits is melting a bit of sodium nitrite over the surface to be cleaned. It melts at low temperature and reacts with the tungsten. Then you wash thoroughly the window with distilled water.
by Roberto Ferrari
Wed Jan 29, 2020 12:01 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Electrostatic lens sizing
Replies: 3
Views: 3267

Re: Electrostatic lens sizing

Hi Patrick
Thanks for sharing.
Not useful for my project but a friend of mine, in struggle with an electrostatic accelerator will enjoy your info.
by Roberto Ferrari
Wed Jan 22, 2020 8:04 pm
Forum: Announcements and Site Administration Topics
Topic: Annual Fundraiser: Let's Try This Again
Replies: 6
Views: 3010

Re: Annual Fundraiser: Let's Try This Again

Paul
Donation appears gone to Tanglewook Ventures.
Is it OK?
by Roberto Ferrari
Tue Jan 14, 2020 11:32 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Increasing use of cylindrical fusors
Replies: 5
Views: 3059

Re: Increasing use of cylindrical fusors

Tim and Dan

But degassing until emptied of gasses, right?
Or do you think that there is a "push-pull" action, loading and outgassing, rytmically?
by Roberto Ferrari
Tue Jan 14, 2020 7:02 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Increasing use of cylindrical fusors
Replies: 5
Views: 3059

Re: Increasing use of cylindrical fusors

Hi Jim

Please, comment on your experiences with titanium and degassing.
by Roberto Ferrari
Tue Dec 31, 2019 7:45 pm
Forum: Vacuum Technology (& FAQs)
Topic: Using diffusion pump oil in a mechanical pump
Replies: 6
Views: 1774

Re: Using diffusion pump oil in a mechanical pump

Agustin Why do you start your long pursuit trying to use a wrong road? Mechanical pump oil has several properties, not only oriented to get a good vacuum but also to protect the steel parts inside the pump. Were are you based? Surely some provider of consumables for vacuum systems, as mass spectrome...
by Roberto Ferrari
Wed Dec 11, 2019 3:53 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 3935

Re: 30keV Deuteron Source

Understood!
Thanks
by Roberto Ferrari
Tue Dec 10, 2019 9:21 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 3935

Re: 30keV Deuteron Source

Hi Scott

Beside my earlier question, I have another one.
Einzel lens designs almost always have a gap of 0.1 D between lenses.
Why you gone further, enlarging the space between lenses? It is almost 0.5 D (being D the lens diameter)
by Roberto Ferrari
Sun Dec 08, 2019 1:57 pm
Forum: FAQs: Vacuum Technology
Topic: FAQ - The bell jar is back - sort of
Replies: 2
Views: 1474

Re: FAQ - The bell jar is back - sort of

Richard
That is refreshing news!
Great return.
As an old vacuumist, I plan to sum my modest knowledge.