Search found 454 matches

by Mark Rowley
Sun Aug 02, 2020 6:51 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 9
Views: 365

Re: Fusor 2020 Activation Experiments

Richard, the picture makes it look like a lot but it's only a moderate stack measuring 9 x 8 x 8". Each block measures 1.5 x 2.5 x 9 " and is practically feather light. With a coupon I think it was only about $25 worth from Hobby Lobby. The whole thing probably weighs 5 or 6lbs at best. I'm fairly s...
by Mark Rowley
Sun Aug 02, 2020 2:48 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 9
Views: 365

Re: Fusor 2020 Activation Experiments

Richard,
Your HDPE arrangement has been nagging me to replicate it. If I can get similar pricing I’ll make the purchase next week.

Mark Rowley
by Mark Rowley
Sat Aug 01, 2020 8:49 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 9
Views: 365

Re: Fusor 2020 Activation Experiments

Hi Joe, My apologies for not replying to this sooner. I got your pm and remembered you question. My moderator is a 9x8x8” cube of standard craft store paraffin wax. The center of the cube to the grid is about 7” and I generally place activation items at 5.5”. I haven’t experimented with any closer p...
by Mark Rowley
Thu Jul 30, 2020 4:58 pm
Forum: Images du Jour
Topic: Fusor 2020 Star Mode
Replies: 2
Views: 132

Fusor 2020 Star Mode

A benefit to a slightly larger chamber are the flashy stars they produce. The previous 2.5” system produced some interesting plasmas but nothing of the classic sense.

Mark Rowley
AD8C8FFF-EEF4-40FB-BA3D-B8665E0A213F.jpeg
by Mark Rowley
Wed Jul 29, 2020 6:24 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 9
Views: 365

Re: Fusor 2020 Activation Experiments

Conducted another Indium foil activation run. 5 minutes exposure time Estimated neutron TIER of 1.5E+6 55kV 3mA 45mTorr D2 Of note, 3hrs after activation it’s still roughly 150cpm over background. Time lapse MCA spectra acquisition of 2200 seconds can be seen here. https://youtu.be/qDzF7zwMZnk 681BE...
by Mark Rowley
Sun Jul 26, 2020 8:37 pm
Forum: Images du Jour
Topic: Carl’s Jr. gone Steampunk ?
Replies: 9
Views: 386

Carl’s Jr. gone Steampunk ?

Lately I’ve bern scouring the forums and internet for ideas about chamber cooling. One photo that were all familiar with was Carl Willis’s water cooled “Carl’s Jr” fusor he built over 15 years ago. Since 2017, I’ve seen a steampunk photo of an actual fusor converted to artwork on Pinterest that bear...
by Mark Rowley
Sat Jul 25, 2020 2:28 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: NEW Fusor V build under way.
Replies: 28
Views: 1415

Re: NEW Fusor V build under way.

It’s great to see Fusor V crankin’ out the neuts!

Mark Rowley
by Mark Rowley
Sat Jul 25, 2020 1:47 am
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 10
Views: 464

Re: Fusor Update - Liam David

Wow! Excellent report Liam. The remote operating arrangement is quite something and almost unheard of. I have also noticed the same drop in numbers as the chamber heats up. Active cooling is something I’ve been toying around with. Forced air seems to help but chilled water in a copper tubing “jacket...
by Mark Rowley
Fri Jul 24, 2020 6:00 pm
Forum: Images du Jour
Topic: Aidan Roy - My Fusor Progress
Replies: 17
Views: 652

Re: Aidan Roy - My Fusor Progress

Dennis, I'd venture a guess that it is a version of Liam David's excellent HV Feedthru design.

viewtopic.php?f=6&t=13220

Mark Rowley
by Mark Rowley
Thu Jul 23, 2020 9:55 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: NEW Fusor V build under way.
Replies: 28
Views: 1415

Re: NEW Fusor V build under way.

Richard I think you’re right about the throttling issue. My Varian HS2 Diff Pump was major overkill for my cross fusor and is still overkill for my larger new fusor. In order to get good numbers I have to keep the D2 flow rate pretty high. Conserving D2 by keeping the diff throttled way back has onl...