Tubbs Accelerator Talk: 2015 HEAS

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RobertTubbs
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Tubbs Accelerator Talk: 2015 HEAS

Post by RobertTubbs » Mon Oct 05, 2015 2:13 am

This is a .pdf of my accelerator talk presented at HEAS 2015.

-RT
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Steven Sesselmann
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by Steven Sesselmann » Mon Oct 05, 2015 3:06 am

Robert,

Thanks for posting, wish I was there for the talk. Your electron suppression circuit is good, I might copy that if you don't mind.

How did you arrive at ∆V=1400V ?

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by RobertTubbs » Mon Oct 05, 2015 3:32 am

Steven,

The zener circuit is a common approach, while that particular picture was done by Ying Wu, I made some corrections in photoshop.

I believe Ying Wu's collection of zeners added up to ~1400V, and that was why the value was chosen.

The ∆V for a successful zener suppression system can be as low as a couple hundred volts.

-RT

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Mike Beauford
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by Mike Beauford » Mon Oct 05, 2015 4:04 am

Robert,

That's a super neat setup you have! Are your neutron production run's very stable with this setup with the occasional flair up every now and then?

Mike Beauford
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by RobertTubbs » Mon Oct 05, 2015 5:24 am

Hi Mike,

Thank you!

It's a very stable and prolific source of neutrons, what few occasional increases/drops in vacuum chamber pressure that occur are caused by variations in pressure within my electrolysis system (soon to be replaced by another lecture bottle of deuterium gas.) Tank gas and a good regulator eliminate most of the increases/drops since the back pressure behind my micro-metering valve remains constant.

-RT

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Andrew Robinson
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by Andrew Robinson » Mon Oct 05, 2015 5:54 am

Excellent presentation Robert and again bravo on your design and construction. You really have a professional looking setup there. Very nice work.
I can wire anything directly into anything! I'm the professor!

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Richard Hull
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by Richard Hull » Mon Oct 05, 2015 6:04 am

I'll second Andrew's kudos. Robert knows his system and answered all questions put to him by the many interested people during his talk. Again, well done and well delivered.

Note: We played hell getting a computer that would work his power point demo, but the third laptop was charm. Sorry 'bout the snag Robert.

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: Tubbs Accelerator Talk: 2015 HEAS

Post by Dennis P Brown » Wed Oct 07, 2015 7:58 pm

Mr. Tubbs' talk was extremely interesting and highly professional; I was very impressed. He did some outstanding real science and demonstrated a useful point that Al makes a great "host" for deuterium implanting.

Just an aside: since he proved he had heavily implanted deuterium in the aluminum target, and was hitting it with roughly 75 keV deuterons, then he was doing a good bit of fusion, too. Shouldn't he now be credited as a "neutron fusion" person and added to the neutron club? (of course, disregard if this has already been done.)

Also, I was wondering if the his device produces any significant X-ray radiation?

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Richard Hull
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by Richard Hull » Thu Oct 08, 2015 6:06 am

Robert is an old fusioneer and neutron club member of several years back.

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.

Sven Andersson
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Re: Tubbs Accelerator Talk: 2015 HEAS

Post by Sven Andersson » Sat Oct 10, 2015 8:37 pm

To Robert Tubbs:

I have an interest, both theoretically and practically, in the fusion reactions that tend to occur in various ion sources when they are fed deuterium gas. It would be very interesting to observe what happens, to the number of fusion reactions, in one of your ion sources, if you vary the pressure and extraction voltage and perhaps other parameters. If you're interested in discussing this contact me! pairwise.relations (at) hotmail.com

Best regards,

Sven Andersson

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