Search found 1472 matches

by Dennis P Brown
Sat Jul 21, 2018 12:24 pm
Forum: New User Chat Area
Topic: HV feedthrough purchase problems
Replies: 3
Views: 202

Re: HV feedthrough purchase problems

I've made all of mine and they work great; availability of very low cost but high performance glass drill sets are simply amazing.
by Dennis P Brown
Fri Jul 20, 2018 7:31 am
Forum: Please Introduce Yourself
Topic: Hello from Canada!
Replies: 1
Views: 138

Re: Hello from Canada!

Hello and any interest's on fusor's or goals you'd like to share?
by Dennis P Brown
Fri Jul 20, 2018 7:24 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 24
Views: 1657

Re: Couple of questions

OK; virus protection software can be your friend. Also, in the control panel, the System and Security menu has a sub-menu that has tools that are very useful for checking for errors and other problems with the computer (of course, do update to the latest version of "Explorer" and download all requir...
by Dennis P Brown
Thu Jul 19, 2018 9:50 pm
Forum: Please Introduce Yourself
Topic: Hello from the Bay Area in California
Replies: 2
Views: 114

Re: Hello from the Bay Area in California

Glad you are pursuing a physics degree but generally, unless you are not sure of an area to study, a master's degree is not useful (it carries no significant value as a terminal degree); mostly it just delays your real degree. Mr. Ferrari is correct - diffusion pumps are very easy to repair since th...
by Dennis P Brown
Mon Jul 16, 2018 5:25 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 24
Views: 1657

Re: Couple of questions

Spell check is your friend; best to avoid posting via cell phones.
by Dennis P Brown
Mon Jul 16, 2018 2:34 pm
Forum: New User Chat Area
Topic: Working Diffusion Pump?
Replies: 7
Views: 361

Re: Working Diffusion Pump?

Putting oil into a diffusion pump (DP) is trivial for most units - one simply pours the REQUIRED amount of DP oil through the main opening (the DP throat. Don't over fill and you need to find out the exact amount for that specific pump.) Also, you may need to clean the inside of the DP first. Aceton...
by Dennis P Brown
Mon Jul 16, 2018 12:14 pm
Forum: New User Chat Area
Topic: Working Diffusion Pump?
Replies: 7
Views: 361

Re: Working Diffusion Pump?

I do not know the policy for groups here (there are, of course) so if that has not already been done, then it should be completed. Richard can address that issue if you don't know what to do. That is one old diffusion pump. As for your questions I can only give guesses since I am not familiar with t...
by Dennis P Brown
Thu Jul 12, 2018 3:23 am
Forum: Please Introduce Yourself
Topic: Bonjour from Montreal
Replies: 1
Views: 145

Re: Bonjour from Montreal

Best of luck; finding good deals is a bit of an art but well worth one's time! Do update as you get items and decide on a build direction.
by Dennis P Brown
Thu Jul 12, 2018 3:14 am
Forum: Images du Jour
Topic: Fusor progress, Antoine Fleitz
Replies: 1
Views: 319

Re: Fusor progress, Antoine Fleitz

Very nice setup and your approach is logical - you are correct that the vacuum system is the most versatile - one can do metal coatings or sputtering with these systems. Getting a proper electrical supply can be involved but far easier than the neutron detection system (of course, one can buy a turn...
by Dennis P Brown
Sat Jul 07, 2018 4:53 pm
Forum: Books & References
Topic: Answer keys w/ explanation?
Replies: 19
Views: 917

Re: Answer keys w/ explanation?

A hint: consider a single layer of atoms (each atom is about 2.7 angstrom in diameter as you calculated) and view these as circular disks. You know that a nucleus is 10-4 the size of this atom so the nuclear disk size is what? To get 1% coverage, one needs 1% of the total area desired (assume 1 cm2)...