Search found 454 matches

by ian_krase
Sat Jan 11, 2020 4:12 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: TA DA New Use of Plasmas
Replies: 10
Views: 1529

Re: TA DA New Use of Plasmas

It's also an ISM band, no?
by ian_krase
Sat Jan 11, 2020 4:07 am
Forum: Items wanted
Topic: 0-200 V, 200 V Pulsed Power Supply Units
Replies: 2
Views: 679

Re: 0-200 V, 200 V Pulsed Power Supply Units

22 amperes? That seems like a huge amount of current.

The 200V power supplies should be fairly simple since many people sell power supplies in this range meant for building vacuum tube equipment.
by ian_krase
Fri Jan 10, 2020 8:23 am
Forum: Announcements and Site Administration Topics
Topic: Visiting Bay Area 13th-17th Jan
Replies: 1
Views: 670

Re: Visiting Bay Area 13th-17th Jan

I live and work in the area so I'm interested!
by ian_krase
Fri Jan 10, 2020 8:22 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: TA DA New Use of Plasmas
Replies: 10
Views: 1529

Re: TA DA New Use of Plasmas

Well, that certainly managed to be absurd. At first I thought that inductively coupled plasma had made it into the beauty market.
by ian_krase
Tue Jan 07, 2020 8:56 am
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 2717

Re: Is It A Farnsworth... or a Hirsch (redux)

Now this is super interesting.

(one feels a little quantum of the legend akin to what Doug Coulter has been working on).

If those rings are einzel lenses, what make up the start and end elements? Are they insulated from the center somehow?
by ian_krase
Sun Dec 15, 2019 2:36 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Making Large Vacuum Chambers
Replies: 10
Views: 1488

Re: Making Large Vacuum Chambers

Who's S and S?
by ian_krase
Sun Dec 15, 2019 2:12 am
Forum: Items wanted
Topic: Wanted: Welding Services
Replies: 0
Views: 692

Wanted: Welding Services

Is there anybody in the San Fransisco Bay / Silicon Valley area who can do TIG welding?

I pulled a welded bolt-stud partway through my baseplate and need it welded back vacuum tight.
by ian_krase
Sat Dec 14, 2019 9:03 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Making Large Vacuum Chambers
Replies: 10
Views: 1488

Re: Making Large Vacuum Chambers

Interesting. This makes me somewhat more optimistic -- one could substitute a heavy metal plate for the acrylic, and machine a conflat into it.
by ian_krase
Sat Dec 14, 2019 9:01 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Efficient way to bombard target with electrons in the 50-100 eV range? (not for fusor)
Replies: 20
Views: 2115

Re: Efficient way to bombard target with electrons in the 50-100 eV range? (not for fusor)

I will only put current through the filament under vacuum (e.g. 1x10^-4 Torr). Will the filament be poisoned at atmospheric pressure in air even if there is no current through it? If you're using pure tungsten filaments, they will not be poisoned by air at any time whatsoever, but they will *burn o...
by ian_krase
Fri Dec 13, 2019 7:31 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Making Large Vacuum Chambers
Replies: 10
Views: 1488

Re: Making Large Vacuum Chambers

As is often the case, I'm not interested in specifically building a fusor. Though my requirements for hermeticity are arguably higher. Meanwhile I have my own apprehension because the chamber types I am looking at still cost enough to not want to dive in blind (at the very least, would need to pay t...