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by Roberto Ferrari
Tue Oct 15, 2019 9:11 pm
Forum: Images du Jour
Topic: Cutting edge GM counter (1953)
Replies: 29
Views: 5970

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: 29
Views: 5970

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: 29
Views: 5970

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
F.jpg (158.65 KiB) Viewed 93 times
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: 3463

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: 3463

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: 3598

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: 6536

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 Nov 09, 2018 4:19 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Titanium walls
Replies: 10
Views: 7846

Re: Titanium walls

Right, good option.
Probably all we tend to start thinking from our own set up.
Surely I suggested the sputter version because I have a small 2.75” CF cross.
by Roberto Ferrari
Fri Nov 09, 2018 12:43 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Titanium walls
Replies: 10
Views: 7846

Re: Titanium walls

Hi Frank Of course you are right! The thread is related to the success of Japanese researchers who improved the neutron generation when using a chamber with titanium walls. See comments by Dan Knapp and Richard. Focusing on titanium, I suggested a cheaper way than a full titanium chamber, just depos...
by Roberto Ferrari
Mon Oct 22, 2018 5:13 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: How to test the quality of heavy water (D2O)?
Replies: 7
Views: 2834

Re: How to test the quality of heavy water (D2O)?

Hi Rich

Thanks for the warning. I had forgotten the hygroscopic property of D2O.

There is a US thesis from the 60's about chromatographic separation of H2, HD and D2 with packed column and low temperature.