## Search found 15 matches

Wed Jun 25, 2014 4:02 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: PEM fuel cell deuterium generator
Replies: 32
Views: 34458

### Re: PEM fuel cell deuterium generator

What's the advantage of using a PEM cell for electrolysis over using simply to metal electrodes and a battery/solar cell?
Thu Jun 12, 2014 11:29 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: How does a fusor scale with size?
Replies: 5
Views: 4288

### Re: How does a fusor scale with size?

'pd' will drift onto the lower side of the Paschen curve which means you need higher densities and high currents to create a discharge at moderate voltages. But isn't the whole rationale behind this pd product that the mean free path inversely proportional to the pressure? So if you compensate the ...
Thu Jun 12, 2014 2:31 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: How does a fusor scale with size?
Replies: 5
Views: 4288

### Re: How does a fusor scale with size?

One general theoretical scaling law for fusion in that at constant voltage, fusion scales as the Density squared * the radius cubed. While losses scale as the radius squared. Hmmm... p: pressure, proportial to density d: chamber size (assume single grid setup with chamber wall anode). C = p*d = con...
Thu Jun 12, 2014 7:20 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: How does a fusor scale with size?
Replies: 5
Views: 4288

### Re: How does a fusor scale with size?

I must clarify. On P*D I meant the paschen law, or the similitude of discharges in general. P is the pressure, D is the distance between the electrodes (grid, wall distance for example), or simply the fusor size. So if you want similar running conditions you should keep this number constant: bigger ...
Wed Jun 11, 2014 10:43 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: How does a fusor scale with size?
Replies: 5
Views: 4288

### How does a fusor scale with size?

I read in this article that discharge properties depend on the product p*d. If we keep pd and the voltage constant we'll get a similar discharge. So a twice larger device on half pressure would have a similar discharge. One can even make a nice glow discharge even on atmospheric pressures that's sev...
Tue May 27, 2014 9:27 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Do we need breakeven to consider fusion power sources?
Replies: 13
Views: 8910

### Re: Do we need breakeven to consider fusion power sources?

Well, they achieved 18MJ of fusion energy for ~10 seconds for 22MJ input into the plasma, but it also required 1GJ of magnetic energy put into the confinement fields first. They don't seem to trouble themselves with that little detail. I thought they were thorough enough to measure the input power ...
Tue May 27, 2014 12:44 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Do we need breakeven to consider fusion power sources?
Replies: 13
Views: 8910

### Re: Do we need breakeven to consider fusion power sources?

JET claims they reached the gain factor of 0.6. Unless they are lying I would say they are almost there... It seems there is a confusion about the breakeven, and I'm a bit confused too. When do we reach the breakeven? When fusion_power_released == power_used OR when electric_power_produced_by_the_r...
Tue May 27, 2014 8:16 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Do we need breakeven to consider fusion power sources?
Replies: 13
Views: 8910

### Do we need breakeven to consider fusion power sources?

I did some back of the envelope calculations. So the fusion gain factor is G = Q_fusion / Q_in, G: the factor Q_fusion: fusion power released Q_in: input power. In a practical power plant the setup would probably turn everything into heat and feed into a heat engine. But probably better designs poss...
Sat May 17, 2014 5:30 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Energy losses due to netural particles.
Replies: 1
Views: 2155

### Energy losses due to netural particles.

Does anyone has data about whether how much energy a fusor (or other types of reactors) loses via light, neutrons and fast neutrals? Someone someday might come up with a clever device that can recycle all electron's and ion's energy via electric or magnatic fields, but fields cannot affect neutral p...
Thu May 01, 2014 10:57 pm
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ - Operational maxims for a fusor
Replies: 2
Views: 4881

### Re: FAQ - Operational maxims for a fusor

Does the 2nd and 3rd links are the same on purpose?