Anode layer ion source. Operation pictures

For the design and construction details of ion guns, necessary for more advanced designs and lower vacuums.
Andrew Seltzman
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Anode layer ion source. Set of 5 complete and tested

Post by Andrew Seltzman » Thu Mar 26, 2009 1:41 am

All 5 ion sources have been completed and tested to produce an ion beam for 30min continuously. All 5 have been helium leak checked to the 10^-8 range, initialy 2 of the welds were bad, however those have been repaired.

Andrew Seltzman
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Richard Hull
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Re: Anode layer ion source. Set of 5 complete and tested

Post by Richard Hull » Thu Mar 26, 2009 1:58 pm

Needless to say, we are all looking forward to the final operation and reports related to all this hard work you are doing. I wish you all the very best in this first effort at a fully gunned amateur fusor..

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

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Re: Anode layer ion source. Set of 5 complete and tested

Post by Dustinit » Thu Mar 26, 2009 11:28 pm

I also am looking forward to seeing this in operation.
Fantastic effort andrew.
As a possible extension on the idea,
I view the design as an assymetric penning trap which traps electrons
and pushes out the ions.
Therefore I see no reason why it needs to be a circular source,
So if you used bar magnets instead, interspaced with electrodes it may be possible
to build a source around the circumference of the fusor, or possibly all the fusor wall space if magnets are placed in a grid pattern.
This would make a more uniform source but I'm unsure it would have any benefits over Andrews superb effort.
Dustin
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Steven Sesselmann
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Re: Anode layer ion source. Set of 5 complete and tested

Post by Steven Sesselmann » Fri Mar 27, 2009 9:23 am

Dustin,

A few more good lateral ideas there, good one!

Steven
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Re: Anode layer ion source. 4 mounted on core

Post by Andrew Seltzman » Tue May 05, 2009 4:46 am

4 ion sources are now mounted on the core.

In this picture 1 of the ion sources is in use at about 800v on the source anode and about -2kv on the grid. The plasma will form a stable discharge all the way down to very low voltage on the grid with no observable pulsing or flickering even with 0.5mA collected by the grid.

When all 4 sources are put into operation, they should allow very stable operation at high vacuums and low grid currents.

Andrew Seltzman
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Steven Sesselmann
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Re: Anode layer ion source. 4 mounted on core

Post by Steven Sesselmann » Tue May 05, 2009 7:37 am

Andrew,

Nice work, excellent photo, I can see your ion source working at the back of the chamber.

Steven
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https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

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Carl Willis
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Re: Anode layer ion source. 4 mounted on core

Post by Carl Willis » Wed May 06, 2009 8:06 am

Hi Andrew,

Looks like steady progress that is likely to pay dividends in the neutron department. This is an advanced development for sure. Good luck getting your high vacuum back in business, and I hope you can find the gas pressure "happy medium" between operability of the ion sources and desirable characteristics in the main discharge.

-Carl
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Re: Anode layer ion source. Operation pictures

Post by Andrew Seltzman » Thu Jul 31, 2014 6:27 am

Well, it's been 5 years since I last posted in this thread, but the quad ion gun setup for the Mark 3 fusor is now operational. Pictures of the power supply and setup follow:

Ion injector operating in testbed
SAM_3242a.jpg
Ion injector operating in testbed
SAM_3244a.jpg
Control board, 4 adjustable buck converters for EMCO HV power supplies
SAM_3240a.jpg
EMCO HV power supplies (5kV, 3mA), box and front panel
SAM_3241a.jpg
Power supply assembled
SAM_3266a.jpg
MHV connections to the 4 anode layer ion sources on the fusor
SAM_3267a.jpg
Star mode with 4 injectors running at 700v anode bias
SAM_3253a.jpg
The supply will be further upgraded to have a fiber optic signal to allow the injectors to be pulsed. This is so a capacitor can be placed in parallel with the central grid and charged up while the fusor is pumped down below the minimum paschen breakdown pressure. The injectors can then be pulsed triggering the breakdown and generating a very high density plasma for a short period of time (for use with the laser density probe).
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Richard Hull
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Re: Anode layer ion source. Operation pictures

Post by Richard Hull » Thu Jul 31, 2014 3:39 pm

Any fusion, neutron numers on this most interesting setup?

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

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Dennis P Brown
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Re: Anode layer ion source. Operation pictures

Post by Dennis P Brown » Fri Aug 01, 2014 11:40 am

Very professional setup - your design and execution appears to be working extremely well. Hope this provides far better fusion results!

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