Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Current images of fusor efforts, components, etc. Try to continuously update from your name, a current photo using edit function. Title post with your name once only. Change image and text as needed. See first posting for details.
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Dennis P Brown
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by Dennis P Brown » Sun Apr 20, 2014 11:09 am

Impressive! Small can be beautiful but like an iceberg, the underlying support equipment (power supplies,vacuum system,gauges, controls,supports) really explode the size and complexity of even the simplest gun!

Great work and thanks for sharing the apparatus.

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Richard Hull
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by Richard Hull » Sun Apr 20, 2014 1:50 pm

Yes, creating a non-earth-friendly environment in order to provide a specialized pure atmosphere in which to move charged particles about in a controlled manner can involve a lot of volume absorbing gear. We are really creating our own little, highly controlled electrical universes in a can. Still, ain't it fun!

Nice work Robert!

Ricahrd 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
Retired now...Doing only what I want and not what I should...every day is a saturday.

RobertTubbs
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by RobertTubbs » Sun Aug 03, 2014 10:13 pm

Update 8/3/2014:

I've upgraded the machine a bit since my last post.

The machine now sports an inductively coupled ion source and a differentially biased electron suppression shroud. See the brief video of the system here: https://www.youtube.com/watch?v=DdLe6No5he4&app=desktop

I'll keep improving things as I go, it's a forever rough draft.

Thanks for the kind words, all!

Enjoy the pictures and a video of the machine running.
RT

edit: I have no idea why the first picture displays as sideways, click on it and you'll get the correct upright view.
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George Schmermund
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by George Schmermund » Mon Aug 04, 2014 8:41 pm

Robert - I'm enthused by the effort that you've put into your BoT machine. There is a faint, but growing interest here regarding this method of producing nuclear reactions. Certainly a lot more work is involved in getting a BoT machine up and running compared to a fusor and, as you've pointed out, it's a project for the advanced experimenter. Few here will ever accomplish more than a fusor, but you're demonstrating that a more serious approach to doing fusion physics is within the reach of the advanced hacker.

I applaud your dedication to the cause and hope to eventually join the ranks of the BoT heads here. Salute!
Anything obvious in high vacuum is probably wrong.

RobertTubbs
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by RobertTubbs » Wed Aug 06, 2014 8:44 am

Thank you for the kind words George.

Doing beam on target to a level that allows one to say "I've done beam on target fusion" is well within amateur reach. However, a BoT that could compare with the typical actively pumped industrial systems from 10-15 years ago is my goal - something I'm slowly stumbling towards.

I'd also say that BoT opens doors beyond fusion research, for example I've been playing with the idea of changing around the system someday for some experimentation in focused ion beam milling. FIB is about as far from my reach now, as the BoT was after the Fusor.

Leveling up let's you see what's possible next, that's the greatest value of the BoT IMHO.
RT

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Dennis P Brown
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by Dennis P Brown » Wed Aug 06, 2014 11:37 pm

Rather than lead shielding (toxic and conductive) why not used 12"x12"x3/8" slate tiles? Home Depot sells these in boxes and are very inexpensive. These tiles are square, can be stacked together and glued, and don't conduct. They have 1/4 the density of Pb so it is easy to calculate the required shield thickness. Disposal isn't an issue unlike lead nor safety concerns in handling or dust. They can be both cut (an inexpensive abrasive blade) or drilled (ceramic bit) if a special shape and/or a hole is needed. They actually look rather nice and professional.

That all said, the accelerator looks very nice.

Have you considered adding simple metal rings along the glass tube body to better contain the protons (weakly focus) and make the electric field more uniform along the tube for more constant acceleration?

Wouldn't mind some more details on your electron suppression system.

RobertTubbs
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by RobertTubbs » Wed Aug 13, 2014 6:08 pm

New [more in depth/nicer] video showing all the equipment and smoother operation.
http://youtu.be/OUDxt2Nya50

Enjoy,
RT

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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by RobertTubbs » Tue Aug 26, 2014 10:30 am

Some additional and hopefully helpful eyecandy.

Peace out,
Robert

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RobertTubbs
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by RobertTubbs » Sun Sep 14, 2014 8:44 am

Miss September.
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RobertTubbs
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Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]

Post by RobertTubbs » Tue Oct 21, 2014 4:15 am

Update: Still air brushing the system, tweaking things here and there, here some glorious eye candy.

Beam entering the secondary electron suppression shroud.
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