UK Culham Fusion visit - what questions to ask?

Discuss how polywell fusion works; share theoretical questions and answers.

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Nick Barsley
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Joined: Sun Feb 10, 2013 8:25 pm
Location: London, UK

UK Culham Fusion visit - what questions to ask?

Postby Nick Barsley » Wed Apr 10, 2013 9:02 pm

Hi All,

I'm going on a public trip around the UK's [url="http://www.ccfe.ac.uk/index.aspx"]Culham Fusion Research Centre[/url] in a week's time. The tour is led by their scientists there, and takes the small group of us "public" around the JET (Joint European Torus) and MAST (Mega Amp Spherical Tokamak) experiments.

I'm going to take the opportunity to ask a lot of questions, and would be happy to post back the scientists replies on this message board.

The questions I want to ask concentrate on the Polywell theory and design.

I've a few in mind from:
- Extent to which the design thermalises towards Maxwellian, losing the necessary well depth for breakeven fusion rate (esp. for pB11?)
- Bremsstrahlung radiation losses (closely linked to the above)
- Latest thinking on direct electricity conversion from helium ions
- Paschen arcing
- Degradation of the walls (interested in how JET and MAST overcome this, what their materials are, cooling flow rates, etc...

What would be other / sharper / better questions to ask?

I'll gladly post back their replies,

Best regards, Nick

ladajo
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Location: North East Coast

Re: UK Culham Fusion visit - what questions to ask?

Postby ladajo » Wed Apr 10, 2013 11:01 pm

You might not get much love or understanding from them regarding Polywell. But, by all means, have at it!
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

mattman
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Joined: Tue May 27, 2008 11:14 pm

Re: UK Culham Fusion visit - what questions to ask?

Postby mattman » Thu Apr 11, 2013 2:20 pm

Hey,

This may be clearer way to frame your question...

Ask them if anyone has measured light radiated from a plasma cloud as a function of temperature.

This includes the X-rays, UV, IR and Visible

Basically it is this plot:

Image

You could just print out this picture and show it too them.

kcdodd
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Location: Austin, TX

Re: UK Culham Fusion visit - what questions to ask?

Postby kcdodd » Thu Apr 11, 2013 7:24 pm

I can tell you those types of measurmenets are quite common. I've done a little in the visible spectrum at low temperatures.
Carter

hanelyp
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Re: UK Culham Fusion visit - what questions to ask?

Postby hanelyp » Thu Apr 11, 2013 8:14 pm

Re: Matman's graph:

Blackbody radiation scales with T^4. Non-Maxwellian energy distribution may be a factor here.

Fusion power follows a curve peaking at a temperature dependent on fuel and energy spread, then declining again.

Not sure how well it applies to magnetically confined plasma, but at more ordinary temperatures, heat conduction is mostly linear with temperature.
The daylight is uncomfortably bright for eyes so long in the dark.

D Tibbets
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Re: UK Culham Fusion visit - what questions to ask?

Postby D Tibbets » Fri Apr 12, 2013 6:18 am

More in keeping with their actual experience/ plans...

what are the goals and expectations of new work with the upgraded JET compared to the old? Changes in input heating, magnetic field management with attention to instabilities, and output goals. Will output improve or is the new work concentrating on various minute controls of instability and energy input?

And, a practical consideration. Do they hope to improve on maintainable Beta with associated increased plasma density and associated fusion output per unit of volume? This is very important in pushing for an actually practical Tokamak power plant,

Dan Tibbets.
To error is human... and I'm very human.

asdfuogh
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Joined: Wed Jan 23, 2013 6:58 am
Location: California

Re: UK Culham Fusion visit - what questions to ask?

Postby asdfuogh » Sun Apr 14, 2013 1:35 am

ladajo wrote:You might not get much love or understanding from them regarding Polywell. But, by all means, have at it!


I think it's more likely that any scientist will be more of an expert in their own specialization and would prefer not to comment on things outside of their expertise because it's a bad political move. You know, unless the scientist is a super bigshot who can take hits like that.

chrismb
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Joined: Sat Dec 13, 2008 6:00 pm

Re: UK Culham Fusion visit - what questions to ask?

Postby chrismb » Mon Apr 15, 2013 5:16 pm

Nick Barsley wrote:What would be other / sharper / better questions to ask?


Print this out and read it, word for word;

"You have published papers saying that you've shown how ICRH and neutral beam heating work together better that either one on its own. What is your argument to say that you are SURE this is nothing to do with entropy mitigation at the plasma edge from work done on ions by rotating radial electric fields in the near fields of the antennae elements, and if you are NOT sure about it then what would you say to an inventor that has a patent for this method and who says you are ignoring his patent rights?"

If you have any senior staff there when you ask that question then direct your question to Steve Cowley, William Morris or Eric Hollis, if they're there. Watch their faces turn white (or red). Do it towards the end of questions in case they cut your visit short....

ladajo
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Joined: Thu Sep 17, 2009 11:18 pm
Location: North East Coast

Re: UK Culham Fusion visit - what questions to ask?

Postby ladajo » Wed Apr 17, 2013 4:12 am

asdfuogh wrote:
ladajo wrote:You might not get much love or understanding from them regarding Polywell. But, by all means, have at it!


I think it's more likely that any scientist will be more of an expert in their own specialization and would prefer not to comment on things outside of their expertise because it's a bad political move. You know, unless the scientist is a super bigshot who can take hits like that.


Yup. Part of my point indeed.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)

What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

Nick Barsley
Posts: 4
Joined: Sun Feb 10, 2013 8:25 pm
Location: London, UK

Re: UK Culham Fusion visit - what questions to ask?

Postby Nick Barsley » Wed Apr 17, 2013 7:02 am

Thanks everyone - I really appreciate all the good questions and ideas. I'll take note book and camera and report back. Really looking forward to it! :)


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