Search found 21 matches

by Samuel Low
Thu Dec 20, 2018 5:30 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: From confinement, to jet mode, and star mode
Replies: 7
Views: 5377

Re: From confinement, to jet mode, and star mode

Thanks for sharing Richard, those SIMION plots in the link you sent are very telling for why the edges of the stars form. My guess then is that "jet" mode comes as a result of asymmetrical positioning of the inner grid (so the electric fields lines are less "concentrated" on one end than the others,...
by Samuel Low
Tue Dec 18, 2018 8:40 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: COMSOL simulation of a FUSOR?
Replies: 23
Views: 15898

Re: COMSOL simulation of a FUSOR?

I don't think COMSOL has a module to do particle tracing unlike SIMION. I know for sure you can definitely run an electrostatic simulation to see the spherical E-field patterns - the usefulness of it would really then be the ability to just see the E-field patterns for different CAD models of inner ...
by Samuel Low
Tue Dec 18, 2018 6:43 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Fusors and Maxwell's Equations
Replies: 6
Views: 5906

Re: Fusors and Maxwell's Equations

Here's my take on it - it has the potential to be a GREAT educational tool, only if people allow it to be. I got funding from my university to build one demo fusor for educational purposes. So, I wanted to use fusors to demonstrate the concepts of spherical capacitance, electrostatic fields, electro...
by Samuel Low
Tue Dec 18, 2018 1:28 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: From confinement, to jet mode, and star mode
Replies: 7
Views: 5377

Re: From confinement, to jet mode, and star mode

Ah, so if it relies purely on the geometry, then jet mode arises as a result of the "asymmetry" of the alignment of the inner grid? Since in reality we can't have something that is purely right smack in the middle; a little bit off centre and we would see electric fields weakened in one particular d...
by Samuel Low
Sun Dec 16, 2018 3:13 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: From confinement, to jet mode, and star mode
Replies: 7
Views: 5377

From confinement, to jet mode, and star mode

Has anyone had any success in explaining the mechanism for how the fusor eventually transits to jet mode or star mode ultimately with a low enough pressure? Does voltage play a role? I would love to hear someone point me in the right direction to understanding this phenomenon, thank you!

Cheers
Sam
by Samuel Low
Wed Aug 15, 2018 6:07 am
Forum: Images du Jour
Topic: Demo Fusor
Replies: 2
Views: 1370

Re: Demo Fusor

I am just noticing a plasma arc jet in the bottom of the grid and I am wondering if it can be used as a plasma thruster of some sort for satellite applications. Would there still be enough particles in the atmosphere in LEO (with a density of 10E-13kg/m3 roughly) to do adequate plasma confinement? L...
by Samuel Low
Wed Aug 15, 2018 6:04 am
Forum: Images du Jour
Topic: Demo Fusor
Replies: 2
Views: 1370

Demo Fusor

Just to share, did a successful run of another new demo fusor with better vacuum parts and electronics. No actual fusion here, just pretty plasma confinement in the works. Voltages are (very roughly) in order of the increasing brightness you see: - 1500V - 2350V - 3125V - 3900V - 4700V - 5450V - 700...
by Samuel Low
Sat Jun 02, 2018 7:16 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 62304

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA

I've compiled the matlab m files into a stand alone program that ramps the supply up to 10kV, it should start ramping up the voltage when executed. DXM_test.zip You will need the matlab runtime(free) on your computer to run the program Get the Windows 64-bit version of the MATLAB Runtime for R2016a...
by Samuel Low
Thu Feb 01, 2018 6:09 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Has anyone used the Spellman X3000 50V-30kV 400uA Rev E7 24Vdc
Replies: 8
Views: 3847

Re: Has anyone used the Spellman X3000 50V-30kV 400uA Rev E7 24Vdc

Hi Finn, thank you! I will remember your post and direct anyone else to see it if they ask about the same HV supply. Hi John, thank you, yes, I have built 2 demo fusors in the past and have calculated an adequate ballast for them :) I must admit I was a bit careless about the first one, where the "t...
by Samuel Low
Thu Jan 25, 2018 1:04 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Has anyone used the Spellman X3000 50V-30kV 400uA Rev E7 24Vdc
Replies: 8
Views: 3847

Re: Has anyone used the Spellman X3000 50V-30kV 400uA Rev E7 24Vdc

I see, thanks for the input Dennis! Is there an optimum current rating? As far as I understand it, the key variable in confining a good plasma is voltage since that sets up the strength for the electric field. Since current (with voltage) also determines the input power, is there a power rating that...