Search found 304 matches

by Roberto Ferrari
Fri Dec 06, 2019 10:20 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 3920

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: 14857

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: 14857

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: 14857

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: 14857

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.
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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: 10986

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: 10986

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...
by Roberto Ferrari
Sat Jul 06, 2019 5:37 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: BNC Thread Size
Replies: 6
Views: 6680

Re: BNC Thread Size

Hi Jake

Beware not all BNC are hermetical.
We learned it the hard way...
See Andrew Seltzmann posts related to ion source construction.
Best
Roberto
by Roberto Ferrari
Mon Feb 25, 2019 12:43 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Fusor analogy to quadrupole mass spectrometer
Replies: 13
Views: 12221

Re: Fusor analogy to quadrupole mass spectrometer

What bothers me of this approach is the high vacuum required for a working mass quadrupole or ion trap.
Seems to be far away from the fusor typical operating pressures.
by Roberto Ferrari
Fri Feb 22, 2019 5:37 pm
Forum: Advanced Technical Discussion Area
Topic: A theoretical discussion based on data re. fusor conditioning fusion
Replies: 11
Views: 6575

Re: A theoretical discussion based on data re. fusor conditioning fusion

Seems to me that your observation is right.
Will wait for your analysis.