Search found 297 matches

by Roberto Ferrari
Wed Dec 11, 2019 3:53 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 2091

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: 2091

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: 640

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.
by Roberto Ferrari
Fri Dec 06, 2019 10:20 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 2091

Re: 30keV Deuteron Source

Hi Scott
Really a beautiful setup.
What is that knob at the lower end of the glass tube?
Deuterium imput or one of the points for differential pumping you mentioned?
by Roberto Ferrari
Thu Oct 17, 2019 6:15 pm
Forum: Images du Jour
Topic: Cutting edge GM counter (1953)
Replies: 32
Views: 11067

Re: Cutting edge GM counter (1953)

Hi Mark

Thanks a lot for that file.
Very similar design.
Now I will struggle for devoting some time to the restoration.
by Roberto Ferrari
Tue Oct 15, 2019 9:11 pm
Forum: Images du Jour
Topic: Cutting edge GM counter (1953)
Replies: 32
Views: 11067

Re: Cutting edge GM counter (1953)

Hi Mark

Being similar the models, I accept gladly your offer.
Please get in touch by PM.

Thanks!
by Roberto Ferrari
Tue Oct 15, 2019 1:20 pm
Forum: Images du Jour
Topic: Cutting edge GM counter (1953)
Replies: 32
Views: 11067

Re: Cutting edge GM counter (1953)

Hi Mark

Electronics inside the main box is splitted, as you can see in this picture.
I am not in the mood to track the wires, etc.

Hi Richard
Your approach is great, but I stick to the conservative way, not to modify too much the original object.
by Roberto Ferrari
Tue Oct 15, 2019 12:45 am
Forum: Images du Jour
Topic: Cutting edge GM counter (1953)
Replies: 32
Views: 11067

Re: Cutting edge GM counter (1953)

In my small collection, I have a Isoto, built in Argentina during the 70's. Copy of a French design.
Unfortunately I have no schematics to attempt to rebuild it.
F.jpg
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by Roberto Ferrari
Fri Aug 09, 2019 2:52 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Interest in RGAs (possibly a candidate for an FAQ?)
Replies: 18
Views: 7109

Re: Interest in RGAs (possibly a candidate for an FAQ?)

Dan, I was talking of continuous EM.
My guess is that succesful intervent cleaned contaminated surfaces. May be partially but good enough to recover function.
Probably those that never recovered got chemical changes.
All in all, I recommend to give a try.
by Roberto Ferrari
Thu Aug 08, 2019 4:46 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Interest in RGAs (possibly a candidate for an FAQ?)
Replies: 18
Views: 7109

Re: Interest in RGAs (possibly a candidate for an FAQ?)

With regard to EM, my experience servicing mass spectrometers is as follows: Washing them with isopropyl alcohol (IPA) and drying it with clean, dry N2 usually permits to extend lifetime. Scrubbing with a cotton swab and extensive washing with IPA sometimes recovered a rebel one. Manufacturers preve...