Rebuilding my fusor.

For Short Term Learning Discussions ONLY. This area is for CURSORY questions and connecting with other users ONLY. ALL technical contributions need to be made in the appropriate forums and NOT HERE. All posts are temporary and will be deleted within weeks or months. You should have already search the extensive FAQs in each of the forums before posting here as your question may already be answered.
User avatar
Richard Hull
Moderator
Posts: 14950
Joined: Fri Jun 15, 2001 9:44 am
Real name: Richard Hull

Re: Rebuilding my fusor.

Post by Richard Hull »

Typically the chamber is metal and should be at ground potential. Any power supply hooked to the fusor must have the positive terminal, (metal vessel/chamber), grounded and the negative high voltage terminal connected to the grid.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Electrically, this is wired the same way.
Except, instead of the cathode being in the form of a cage; there are 2 cathode oriented 180 degrees from each other.
All the current is forced to flow from two - 3/32" tungsten rods.

"It is like the difference between cupping the plasma in your hands, and pinching it between two fingers."

And yes, the chamber can be the anode.
Attachments
20231104_172807.jpg
20231104_170902.jpg
20231104_170721.jpg
Last edited by William_Estlick on Sat Nov 04, 2023 7:58 pm, edited 1 time in total.
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

This is the rig I will use to hole the cathodes inside the chamber.
Attachments
20231104_183615.jpg
20231104_183627a.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

High tempriture porcine ceramic.
This is a vary good insulator.

Mix 50/50
Porceline clay
120 grit Aluminum oxide
Water

I usa a rock tumbler and enough water to make a slurry.

A couple of quartz rocks will help it mix.
Attachments
20231112_100900.jpg
20231112_102253.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

The slurry can be allowed to dry to the required consistency.
Attachments
20231112_102904.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

I have been experimenting with dipping the tungsten rods like making candles.
But for now, I am going to use the tig nozzles to make my cathodes.
Attachments
20231112_103229.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Next is actually making the cathodes, I will not bore you with the details.f you have any questions, feel free to ask.

Bye the way, I do not fire the poceline.
If the current is high enough, it will fire itself.
Attachments
20231112_111021.jpg
20231112_111009.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

While this next batch dries, I need to make a rectifier for my neon sign transformer.
Attachments
20231118_180832.jpg
20231119_220301.jpg
Last edited by William_Estlick on Sun Nov 19, 2023 10:56 pm, edited 1 time in total.
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Before making my coltage multiplyer, I want to run the fusor on 15kv.
Using four - 30kv H5030f diodes in paralell will hopefully handle the current.
We will see.
Attachments
20231118_180905.jpg
20231118_181012.jpg
20231118_181206.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Testing out the rectifier.
15kv dc and holding....

"Nice negative glow region on the left electrode, positive column to the right."
Attachments
20231126_205317.jpg
20231126_205503.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Blacking out the chamber and cleaning the glass.
Attachments
20231130_180835.jpg
20231130_180509.jpg
20231130_180224.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Lightly sand to shape the porcine and expose the tip of the tungsten rod.
At this point, more porcine can be added to rework the tip.
Attachments
20231202_132336.jpg
20231202_143708.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Wrap the bare wire of the high voltage wire around the end of the tungsten rod.
From now on, rubber splicing tape will be used to make all the connections.
Attachments
20231202_133428.jpg
20231202_132656.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

New pair of cathodes with 1/2" gap, ready to go.
Attachments
20231202_213208.jpg
20231202_213150.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Adding leads to the cathodes and inside the chamber.
Attachments
20231202_220010.jpg
20231202_214824.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Splice the leads from the chamber to the cathode leads.

Finally, black out anything shiney that might reflect off the glass or camera lenses.

The gap between cathodes and anode is 2.5".
Attachments
20231202_222301.jpg
20231202_221301.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

First run with this setup, needs more power.
I'm going to add a capacitor.
Attachments
20231209_233457.jpg
20231209_233357.jpg
20231209_233400.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

Adding a capacitor my circut promptly burned out my rectifier.
Next time, I will submerge it in distilled water.
Attachments
20231211_190603.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

So of course, I need to make a new, more robust full bridge rectifyer.
Attachments
20231211_192225.jpg
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

I replaced the flat cathodes with pointed ones and pumped it down again.
Attachments
20231213_170729.jpg
20231213_170656.jpg
20231213_170706.jpg
20231213_170753.jpg
20231213_170955.jpg
20231213_171004.jpg
20231213_171014.jpg
20231213_171022.jpg
User avatar
Richard Hull
Moderator
Posts: 14950
Joined: Fri Jun 15, 2001 9:44 am
Real name: Richard Hull

Re: Rebuilding my fusor.

Post by Richard Hull »

You may be saddened by the lack of responses on your efforts. Most here are fusion folks and can't see your efforts headed there. Thus, the lack of positive or questioning response. Your efforts are not done in a sufficient vacuum for fusion. Your construction doesn't appear to be aimed in that direction, either.

I personally laud your efforts to work in the plasma and arc realm. Teaching oneself about such things at the core level is to be appreciated by all inquiring minds. You are obviously enjoying your work here and that is what counts. Just know that I read every one of your postings with images.
I am sure others enjoy them too.

You are a "doer" and that is often more than most people ever involve themselves in within a study.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

I know this is outside the box, just bare with me a little longer.
Under the rite conditions, with the addition of deuterium and a high enough current, this will fuse. I assure you, the physics is solid.
I still need to work with the cathodes and insulation.
I have heavy water and a reversable fuel cell to get working.
Just waiting on a neutron detector.
User avatar
Dennis P Brown
Posts: 3118
Joined: Sun May 20, 2012 10:46 am
Real name: Dennis Brown

Re: Rebuilding my fusor.

Post by Dennis P Brown »

Well, I have followed and commented on your work for a while - trying to help with issues you asked about. I am impressed by your perseverance to this project. We say build it and prove it. Looks like you have built it and will try the prove part. Very good.
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

After adding more splicing tape and replacing the upper cathode and I ran it again.

All the voltage leak disappeared, but then the lower cathode started to leak.
I think it is from the porcine expanding and contracting as it heats and cools is causing cracks.

I am not worried about it because some of them work fine for multiple uses.

But also, the porcelin has this cool property.
If there is enough current, a crack in the porceline will melt and refuse sealing the leak. 15kv just isn't enough unless I make the gaps smaller.
Attachments
20231216_132348.jpg
20231216_132441.jpg
20231216_125616.jpg
Last edited by William_Estlick on Sun Dec 17, 2023 9:39 pm, edited 2 times in total.
William_Estlick
Posts: 99
Joined: Fri May 22, 2015 4:47 pm
Real name: William_Estlick_Sr.
Location: Cape Cod, MA

Re: Rebuilding my fusor.

Post by William_Estlick »

This is the one image I really want to get.
The plasma appears to have a coherent structures i.e.(Aston dark space, Cathode glow, Cathode dark space) on both upper and lower cathode.
But then there is a white line between the cathodes.
I am thinking that because the cathodes are electrically bonded, that a secondary current is being induced, like a solenoid.
But we will see.
I then changed both cathodes to have flat porcelain tops and pointed electrodes flush to the tig nozzle.
Attachments
20231217_192602.jpg
Glow_discharge_structure_-_English.svg.png
Vortex.jpg
Post Reply

Return to “New User Chat Area”