[Francisl]

I have a suggestion for monitoring the metallic impurities in the pinch.
After a pinch occurs, a positively charged ion beam exits. It contains alpha particles and should also contain metallic impurities. A collection plate can be placed in the beam’s path and the metals should be deposited there. The amount of deposition is related to the vaporization from the electrodes.
The collection plates can be sent to laboratories such as: Aston Metallurgical Services Company, Inc or Silicon Cert Laboratories. They can detect the type and amount of the impurities at very small amounts. This analysis should help to speed up the performance increases in the dpf device.

[Francisl]

A lot of the economic numbers that you are asking for will be gathered during the next 1 or 2 years of fusion experiments. The numbers that you have seen so far are based on current science and best estimates.

[Francisl]

The article gave a very good explanation of what is happening based on evidence and theory. Can the emission spectrum from the high voltage discharge be used to monitor the voltage levels as the sheath moves forward?

[Francisl]

How can that hypothesis be tested?

[Francisl]

Updated link for beryllium suppliers.

[Francisl]

Tim1 wrote: I can find lots of references to the voltage that the capacitors run at (45 KV,) but not much about the pulse shape (frequency spectrum) or the capacitance of the capacitors. (I found a chart that indicated that they were in the 2 digit micro-farad range, but I could not make out the numbers.)

I am trying to figure out the effects of inductance and skin effects of various parts.

Did I see the General Atomics part number somewhere?

Here is a link to previous information.

[Francisl]

markrh wrote: What is the energy required to combine Boron 11 and Hydrogen nuclei to form carbon 12 and what is the energy output when the nucleus splits to become helium. It is unclear to me from where this differential in energy is derived.

I have read somewhere that there is an up/down characteristic to P and N depending on the atomic number of the nuclei in question. Can some explain this to me with a reference to make this more clear?

Here is a link to a previous discussion on this topic.

[Francisl]

Here is a link to a calculator for this example: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html

Here is a link to high power tests on beryllium: http://www.iop.org/Jet/fulltext/JETR96002.pdf

[Francisl]

Go to the LPP Executive Summary http://lawrencevilleplasmaphysics.com/lpp-executive-summary/ and the patent number included in that article. You will have to copy and paste the web link. The final method of direct conversion will be an engineering decision based on efficiency and cost.
The units produce particle beams, x-rays and heat. These outputs can be used for other purposes than just making electricity.

[Francisl]

vansig wrote: And, here is another article in NextBigFuture…
http://nextbigfuture.com/2014/04/lawrenceville-plasma-physics.html

When I click on that link I get ERROR 403 – FORBIDDEN from HostGator.com. If I copy that url and paste it into a browser it works fine. I don’t know what the difference is.

[Francisl]

zapkitty wrote:

Zapkitty,
How would you like to handle longer articles than are normally posted on these forum pages? Longer articles with pictures or diagrams may become more common as some of the fusion projects make more progress.

Wouldn’t that be the same as what I proposed above?

“…Articles by FFS members.”

Yes. I didn’t know what form it would take. Some websites show the first paragraph of an article and then a “more” button to click on the full article. This allows a viewer to read the first part of the article and then decide whether to read the rest of it or move on to the next article. Science Daily uses this technique.
There may be some technical or educational material that would be good to post. Should that be listed as a topic in the forums or will that be listed separately to avoid getting lost?

[Francisl]

Zapkitty,
How would you like to handle longer articles than are normally posted on these forum pages? Longer articles with pictures or diagrams may become more common as some of the fusion projects make more progress. Should a short article be posted in the forum with the bulk of the article referenced by a link? Will this website have a repository for these longer articles? I think that most of the links that have been posted so far connect to websites that will be around for a while. This may change in the future and it would be nice to have a place where we can find that information.

[Francisl]

You have to consider the direction of the magnetic field. An alpha particle beam passing lengthwise through the center of a solenoid is equivalent to an electric conductor running lengthwise through the center of a solenoid. The lines of the magnetic field surrounding the conductor run parallel to the windings of the solenoid. Each layer of windings in the solenoid are exposed to the same intensity of the magnetic field from one end of the coil to the other. There is no driving force to create a voltage difference and current flow.
If you turn the solenoid perpendicular to the direction of the particle beam then you get a difference in the magnetic field from one end of the coil to the other end and that would cause a voltage difference and a current flow. The coils have to be designed to take into account the high speed pulses of the particle beam. Many such coils could surround the particle beam.
Here is a link to a Rogowski coil.
I think other variants would work too since this is a pulsed current. You just have to keep in mind the direction and intensity of the magnetic field as it changes with time.

[Francisl]

Earl of Plasma wrote: It was another thing I forgot to ask about. How does it work with tungsten or Wolfram cathode? Do LPP change material becouse of the higher melt point for Wolfram? It must though have higher resistance. Isn’t that a disadvantage?

Yes, tungsten was chosen because of its high temperature rating. The conductivity is surprisingly good.

[Francisl]

DerekShannon wrote: I’m starting this forum for discussion of the 2014 kickoff report and 2013 review released by LPP.

The above link shows the most recent plan for tackling the problems you mention.

[Author]

Posts