Search found 19 matches

by RealBorg
Thu Dec 11, 2014 12:58 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Cosmic Rays?
Replies: 10
Views: 4528

Re: Cosmic Rays?

Probably really a cosmic ray incident, remember that a single high energy particle creates a shower of particles when hitting the atmosphere. Have you read about the oh-my-god particle (http://en.wikipedia.org/wiki/Oh-My-God_particle)? Although that was a one time detection event, keep in mind that ...
by RealBorg
Mon Dec 01, 2014 2:21 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Angular vs Linear momentum in reaction cross-sections
Replies: 5
Views: 3044

Re: Angular vs Linear momentum in reaction cross-sections

I think he is not referring to the quantum mechanical spin of the nucleus (which has nothing to do with angular momentum) but to the angular momentum of the atoms and molecules as used in microwave ovens and MRTs. Interesting thing is, that the deuteron could already be polarized in our setup...

tom
by RealBorg
Thu Oct 16, 2014 12:48 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Pump Ideas
Replies: 10
Views: 5143

Re: Vacuum Pump Ideas

Leakage seems to be down to a few tens of microns per day, I guess it is just the cheap single stage rotary vane vacuum pump which cannot go down further. I remember operating ultra centrifuges about 20 years ago where we switched on the diffusion pump or it was turned on automatically "below 1000 m...
by RealBorg
Sat Oct 11, 2014 9:28 am
Forum: Vacuum Technology (& FAQs)
Topic: Teflon Tape and Vacuum grease
Replies: 12
Views: 7582

Re: Teflon Tape and Vacuum grease

My personal tip for sealing vacuum connections is "Thinking Putty".

While not a perfect sealant (outgassing) it is cheap and has high enough viscosity to be wrapped around any connection suspected to be leaking.

Tom
by RealBorg
Sat Sep 27, 2014 10:09 am
Forum: Vacuum Technology (& FAQs)
Topic: Why do you need a diffusion pump?
Replies: 6
Views: 2737

Re: Why do you need a diffusion pump?

Fusor operation requires that 1) mean free path > grid size 2) dielectric strength > grid distance / voltage 3) deuterium gas has anyone ever calculated the smallest size / highest possible pressure for a fusor? dielectric breakdown would most likely prevent a 59nm sized fusor operating at ambient p...
by RealBorg
Tue Aug 26, 2014 9:58 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Measuring grid temp
Replies: 9
Views: 4019

Re: Measuring grid temp

I think polyethylene is an excellent window material for infrared.

tom
by RealBorg
Sun Aug 24, 2014 12:54 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Theoretical Question Regarding Fusor....
Replies: 5
Views: 2452

Re: Theoretical Question Regarding Fusor....

Looks like your grid is not as smooth as it is supposed to be. I suggest you use fine sanding paper.

Tom
by RealBorg
Fri Aug 22, 2014 8:56 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Pump Ideas
Replies: 10
Views: 5143

Vacuum Pump Ideas

My mechanical vacuum pump only makes it down to about 700 micron. Before I resort to buying a diffusion or turbomolecular pump from eBay, I want to experiment with some ideas: 1.) Sorption (already working down to 10 microns) Activated carbon has a large surface which is in adsorption/desorption equ...
by RealBorg
Thu Aug 21, 2014 11:04 am
Forum: Vacuum Technology (& FAQs)
Topic: Diffusion Pump
Replies: 7
Views: 2545

Re: Diffusion Pump

I believe oil diffusion pumps are a poor choice for a fusor because they cause oil contamination and are more efficient for hydrogen than turbomolecular and sorption pumps. Actually I am planning to operate my fusor with the activated carbon in place in the chamber. Working Hypothesis: The surface o...
by RealBorg
Thu Aug 21, 2014 7:28 am
Forum: Vacuum Technology (& FAQs)
Topic: Diffusion Pump
Replies: 7
Views: 2545

Re: Diffusion Pump

If you don't want to spend a lot of money on you vacuum system, I suggest you get or build a sorption pump. Activated carbon has a large surface with adsorption / desorption of gas molecules in thermal balance. If you heat activated carbon while evacuating with a roughing pump most of the gas molecu...