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Couple of questions

Posted: Mon Jun 25, 2018 10:11 pm
by steventw
Hi

I got my vacuum chamber that going to use and pump
Parents wanting plenty of safety features
So wondering where could source some lead sheeting from to make a box for chamber to go in for neutron absorption
And what would a faraday cage be good to make out of for any chance of lightning discharge to ground it

Hope can help

Thanks

Steven

Re: Couple of questions

Posted: Tue Jun 26, 2018 4:04 am
by Jerry Biehler
Roofing suppliers might have lead sheet.

You dont need a faraday cage, you are not working anywhere near the voltage that would require one.

Re: Couple of questions

Posted: Tue Jun 26, 2018 4:07 am
by steventw
Ok thanks will look into it

Re: Couple of questions

Posted: Tue Jun 26, 2018 8:25 am
by ian_krase
Personally, I STRONGLY recommend that you put plenty of work into excellent grounding. Get some thick-ish copper wire and connect all the things in a star network.

Even if you don't have an actual faraday cage, making sure that you'll inadvertantly touch or get neara grounded conductor rather than a hot one is a good idea. As well as making sure that grounding can't fail due to plugs separating.

Re: Couple of questions

Posted: Tue Jun 26, 2018 7:58 pm
by Dennis P Brown
Neutrons are not stopped by lead shielding at all; rather, light hydrocarbon material like paraffin will stop neutrons but most fusors produce very few from a health stand-point.

Lead or slate can be used for X-ray shielding. I use slate since it is non-toxic and non-conductive - cheap and easy to obtain and cut. Available at any home depot. These materials can stop the x-rays that a high voltage system can generate (when operating over 20 kV.) One must calculate the thickness using the max voltage your system will have.

Agree with Ian that good ground system is critical for safety as well as using proper high voltage cable (i.e. correct voltage rating)! Valid grounding is absolutely necessary so one does not 'float' their chamber making it develop a lethal potential.

Re: Couple of questions

Posted: Wed Jun 27, 2018 3:25 am
by MatthewL
A box is not really necessary. you could just build a single square "plate" about 12" X 12" with hydrocarbons and some lead or slate. This will create a shadow cone shield which should work great. Check the FAQs to find more information.

-Matthew

Re: Couple of questions

Posted: Wed Jun 27, 2018 4:15 am
by steventw
Thanks for advice

Got my vac chamber and pump and magnets for idea
So far cost about 1900 AU

Going to be getting a 30v 10A lab grade power supply from eBay next pay
Hopefully is enough to create plasma

Just need to modify vac chamber for power in and gas inlet for hydrogen and build housing for magnets

Will look into the light hydrocarbons/slate

Re: Couple of questions

Posted: Wed Jun 27, 2018 4:55 am
by Richard Hull
I don't think a 30v supply will create a plasma. 30kv @10 ma will. (30,000 volts @ .01 amps)

Richard Hull

Re: Couple of questions

Posted: Wed Jun 27, 2018 11:42 am
by Dennis P Brown
Just creating a plasma requires a few hundred volts, at least; however, you indicate you are interested in real fusion. If that is the case, getting a power supply that can do over 20 kV is required and very likely near 30 kV. But voltage isn't all one needs - the power required for detectable fusion is around 200 watts (higher, is better.) Getting a power supply that can achieve both these levels can be difficult and expensive. Also, these are lethal power supplies. Read the FAQ's on this subject and read what others have done in the past.

Re: Couple of questions

Posted: Wed Jun 27, 2018 3:43 pm
by Rich Feldman
Please keep us informed of your progress, Steven.

30 volts is plenty to make a plasma, with plasma current up to about an amp without damage,
if you have a hot cathode. Common in mercury vapor rectifiers like the 866 type.
A forum search found some old presentations here.
rallcr.JPG
rallcr.JPG (13.71 KiB) Viewed 4498 times
With a suitable dropping resistor, the same DC supply can power the rectifier filament.