Search found 157 matches

by Liam David
Sat Jul 25, 2020 4:18 pm
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 20
Views: 3153

Re: Fusor Update - Liam David

Thanks for all the compliments! There is a fan blowing directly onto the chamber which helps by a few degrees, but it's far from enough. It cools stuff down between runs more than anything. I've started thinking about water cooling as well, perhaps some 1/8" copper or aluminum tubing around the arms...
by Liam David
Sat Jul 25, 2020 12:55 am
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 20
Views: 3153

Re: Fusor Update - Liam David

IMG_20190925_171532.jpg
Solenoid valve to protect turbos in case of power failure

And some plasma pictures:
by Liam David
Sat Jul 25, 2020 12:50 am
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 20
Views: 3153

Fusor Update - Liam David

I've been working steadily on my fusor for the past several months and have a few noteworthy updates to share. DAQ / Control System I made a new control box that has hardwired connections for voltage, current, and MFC deuterium flow. The signals are passed through 100ft of 15-core, stranded, shielde...
by Liam David
Sat Jul 25, 2020 12:00 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Building an Inexpensive HV Feedthrough: The Complete Saga
Replies: 8
Views: 3245

Re: Building an Inexpensive HV Feedthrough: The Complete Saga

I've made some modifications on the vacuum side of the feedthrough to eliminate arcing. The ceramic disc on the original version, intended to shield the quartz from the plasma, quickly sputtered over with graphite and became conductive. It arced across the surface and to the chamber wall, restrictin...
by Liam David
Fri Jul 24, 2020 11:44 pm
Forum: Images du Jour
Topic: Aidan Roy - My Fusor Progress
Replies: 19
Views: 2472

Re: Aidan Roy - My Fusor Progress

I can still vouch for the glass feedthrough design. I've tested it up to 60kV both with and without plasma, and my only limitation is x-ray shielding and corona on my ballast resistor. Never had any arcs or breakdowns. There have been some modifications on the plasma end, but these I'll describe in ...
by Liam David
Sun May 03, 2020 12:55 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Building an Inexpensive HV Feedthrough: The Complete Saga
Replies: 8
Views: 3245

Re: Building an Inexpensive HV Feedthrough: The Complete Saga

As I mentioned in the original post, the metal component is a standard 2.75" conflat to 0.75" or 1" quick-disconnect adapter. An o-ring seals the outside of the alumina or glass tube to the fitting and is compressed with the nut on the fitting. These are all Ebay finds or from other surplus websites...
by Liam David
Thu Feb 20, 2020 1:35 pm
Forum: Images du Jour
Topic: Dallas Maker Space setup progresses
Replies: 6
Views: 2312

Re: Dallas Maker Space setup progresses

Ion/electron beams did this to my viewport:

IMG_20190713_160425.jpg

I'd hate to see that happen to a bell jar under vacuum.
by Liam David
Fri Jan 31, 2020 1:45 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Newbie construction of chamber
Replies: 7
Views: 1658

Re: Newbie construction of chamber

We just get many one-timers who do no more than add to the membership count. Not trying to scare you off and certainly keep the enthusiasm. Welcome to the forums!
by Liam David
Thu Jan 30, 2020 11:30 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Newbie construction of chamber
Replies: 7
Views: 1658

Re: Newbie construction of chamber

"Construction / Technical Do not post simple questions here . Use the New User Chat area" is the header of this section of the forums. You haven't written an introductory post in the appropriate section and need to correct this. All your questions have been answered numerous times in the forums and ...
by Liam David
Thu Jan 30, 2020 5:01 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Building an Inexpensive HV Feedthrough: The Complete Saga
Replies: 8
Views: 3245

Re: Building an Inexpensive HV Feedthrough: The Complete Saga

Thanks for the compliments. Hopefully the design will get someone out of a rut. I absolutely agree that motivation is the key here. My journey from this (late 2013, early 2014): 2014-01-24.jpg to achieving fusion (summer 2019) was quite a rocky experience. Failures included: - Noise pickup by the ne...