FICS II Planning and construction

For posts specifically relating to fusor design, construction, and operation.
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Werner Engel
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Re: FICS II Planning and construction

Post by Werner Engel » Sat Jan 16, 2016 10:01 am

Steven, remembering your entry “Problems to be solved in FICS-II” I have two suggestions for you:

Regarding the floating MFC: What about using a KF or CF insulators between your FICS and the MFC? I recently found such a device which is always used in professional ion sources: https://www.vacom.de/en/products/electr ... insulators

And the remote control: Using an older laptop running on batteries attached to a NI-USB6211 using LABVIEW as a kind of SCADA solution (Andrew Selzman is using a similar approach) you can control everything via remote – even on high voltage potential using WLAN. There are also fiber/CAT5 converters available which are completely transparent on the Ethernet protocol level. That´s the way how my project works.

Thanks for posting your project, it’s very inspiring for me!
Werner

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Steven Sesselmann
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Re: FICS II Planning and construction

Post by Steven Sesselmann » Sat Jan 16, 2016 10:42 am

Werner,

Thanks for your suggestions.

Unfortunately a ceramic break nipple won't work in my case as I want to feed the gas directly into the cathode. If the gas inlet is at ground potential to the gas outlet at -50kV, the gas will simply light up as a neon tube and conduct electrons to ground. For FICS to work as intended the deuterium supply needs to float at cathode potential, ionisation must take place at negative potential.

I like the idea of fibre optic Cat5 transmitter, this might work to control the MFC, so if you have any recommendations where to get this I would be most grateful.

It is absolutely my intention to operate the reactor remotely, the PSU voltage and current are easily operated remotely with a variable 10V DC source (actually the PSU provides a stabilised 10V outlet for this purpose).

The outputs will be monitored remotely in Labview using a simple DAC. (NI-USB-6008) and a separate Laptop running PRA

Analog port 1: Vacuum Gauge
Analog port 2: Current Input (
Analog port 3: Current Output

PRA Left Channel : Neutron Counter
PRA Right Channel: Gamma/X-Ray detector

Operating the MFC remotely is still a problem to be solved.

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

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Werner Engel
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Re: FICS II Planning and construction

Post by Werner Engel » Sat Jan 16, 2016 2:31 pm

Steven,

here are some samples of products which can be used to convert fiber to copper:

https://www.reichelt.at/Medienkonverter ... ANGUAGE=EN

https://www.lichtleiterkabel.com/produc ... 2000m.html

BR,
Werner

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Steven Sesselmann
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Re: FICS II Planning and construction

Post by Steven Sesselmann » Sat Jan 23, 2016 7:32 am

image1.JPG
Zener test..
Today I installed some of the furniture into the cage.

On the right is the 5M Ohm ceramic ballast resistor, above it is the fat coaxial cable core coming from the PSU, it leads straight up through the cage with the ground braid connected to the cage.

On the left is my home made 50kV zener diode array.

After installing and grounding the Glassman 125kV (16mA) PSU I gave the zener array a quick test, and it performed beautifully.

To test it I used a 1M Ohm ballast resistor between ground and the cold end of the zener array.

At 45 kV the reverse leakage was only 0.17 µA and the break down was exactly at 50 kV when the current suddenly hit the PSU limit which was set to 500 µA. I couldn't have wished for a better result.

Next project is the vacuum system..

Steven
Last edited by Steven Sesselmann on Sat Jan 23, 2016 3:09 pm, edited 1 time in total.
Reason: corrected current draw from mA to µA
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

Andrew Seltzman
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Re: FICS II Planning and construction

Post by Andrew Seltzman » Sat Jan 23, 2016 9:34 pm

I have used the TP Link MC100CM fiber optic Cat5 transmitter with great success, both on my fusor and on my PhD work at UW
http://www.ebay.com/itm/TP-LINK-Fast-Et ... xyVLNSpeM6
Andrew Seltzman
www.rtftechnologies.org

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Steven Sesselmann
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Re: FICS II Planning and construction

Post by Steven Sesselmann » Sun Jan 24, 2016 2:13 am

Andrew,

Thanks for the link, I have looked at these, they look neat, but I can't yet get my head around how to convert a digital cat 5 to the analogue 0-10V required for the pressure controller?

One line of thought suggested by David Housley was to use a PWM to convert to voltage, so I bought a couple of PWM to analogue voltage modules to experiment with, the digital side it will be a learning curve for me.

Plenty of hardware work to finish before I tackle that one, making stuff from metal, glass, plastic, and the occasional analogue circuit is my expertise, so I will call out for help when I get to the digital stuff.

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

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Werner Engel
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Re: FICS II Planning and construction

Post by Werner Engel » Sun Jan 24, 2016 3:59 pm

Andrew,

did you also find a USB to fiber converter? The ones I found where extremly expensive (> 2.000 $)
This would be even easier to connect a NI USB-DAQ which is on high voltage potential to a PC outside the Faraday cage ...

BR,
Werner

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Steven Sesselmann
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Re: FICS II Planning and construction

Post by Steven Sesselmann » Mon Jan 25, 2016 12:59 am

fics.jpg
FICS Schematic
So how effective is FICS as a battery? Here is a simple circuit schematic showing the FICS principle of charge separation.

The D+D fusion reaction has a 50/50 probability of producing a single proton charge and a Tritium with one charge and an alpha particle with two positive charges and a neutron, so we can say on average each fusion reaction emits +2 elementary charges. Running at 10^6 fusion reactions per second we are therefore separating 2 x 10^6 charges, however these charges are climbing through a potential of 5 x 10^4 Volts so we multiply these numbers and get 1 x 10^11, so how many Coulomb seconds is this?

1 Coulomb = 6.24 * 10^18

(1*10^11) / (6.24 * 10^18) = 1.6 *10-8 A or 16 nA

Richard will be quick to point out that we won't be lighting up the city with it, but wait...

What if we achieve 10^7 fusions and increase the potential to 10^5, this would get us into the µA region and possibly be enough current to maintain a charge on the grid, thereby establishing a controlled self sustained fusion reaction.

I should also mention that the grid in a FICS reactor is not impacted upon by ions as in a fusor, so it doesn't suffer any heating or thermionic emission, past experiments show it draws very little current.

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

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Steven Sesselmann
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Re: FICS II Planning and construction

Post by Steven Sesselmann » Sat Feb 13, 2016 10:39 am

A brief video showing where I am up to..

https://youtu.be/nwG_y3ZFV9g
progress-video.png
Progress
progress-video.png (120.98 KiB) Viewed 2539 times

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

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Werner Engel
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Re: FICS II Planning and construction

Post by Werner Engel » Sat Feb 13, 2016 11:39 am

Hi Steven!

Just viewed your Video.
Congrats to your SCADA software with Labview! It seems to work perfectly.
How did you remote controll your Glassmann? Using a variable Input or serial communication?
My Turbo pump Controller also has a serial connection - but as it is RS 485, it's a little more time consuming to use it in Labview.
Please keep telling us about your USB connection solution being on high voltage - and how it works!

Good luck!
Werner

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