Search found 1220 matches

by Frank Sanns
Mon Feb 23, 2004 3:25 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: minimum voltage?
Replies: 3
Views: 1955

Re: minimum voltage?

<t>Depending on the gas fill, the minimum voltage for glow can be only a few volts since this is the ionization voltage of all of the atoms. The plasma may not give a visible glow until some 10s of volts and microamps of current but it will be there. By 100 volts and a micoamp of current a good glow...
by Frank Sanns
Fri Feb 06, 2004 9:27 pm
Forum: Fusion --- Past, Present, and Future
Topic: Burying the Rad stuff
Replies: 9
Views: 3990

Re: Burying the Rad stuff

<t>The repository is not a great solution in itself. At a presentation by Bettis, the contractor that is involved in desiging and managing the proposed site, they showed many details of how the site will run. <br/> <br/> The matieral for containment and protection from ground water have only been in...
by Frank Sanns
Mon Feb 02, 2004 11:13 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: A consideration for the choice of fusor outer shell material.
Replies: 2
Views: 1435

A consideration for the choice of fusor outer shell material.

<t>All of the non fusion radiations are x-rays from the fusor outer shell. The high velocity electrons strike the outer shell and produce radiation when they rapidly decelerate (Bremsstrahlung radiation). The faster you decelerate the electrons the more and higher the energy of the x-rays that are p...
by Frank Sanns
Mon Feb 02, 2004 3:04 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Thickness density units
Replies: 4
Views: 1491

Re: Thickness density units

<t>Aluminum is the material almost always used to shield soft x-rays in diagnostic equipment. Since it is so commonly used in that industry I could see how it would be assumed to be the standard for all.<br/> <br/> Half Value Layer (HVL) is another way to look at shielding. This is the thickness tha...
by Frank Sanns
Sun Feb 01, 2004 6:12 pm
Forum: Vacuum Technology (& FAQs)
Topic: Some pumps
Replies: 20
Views: 5005

Re: Some pumps

<t>Adam,<br/> <br/> Look for the tall rotary piston pumps in refrigerators and air conditioners and not the short and fat dome shapped ones. They supposely can get down fairly well to a few torr. Two in series should get you down to 200 mTorr or better. Even a single good one should work with a diff...
by Frank Sanns
Sun Feb 01, 2004 3:36 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Thickness density units
Replies: 4
Views: 1491

Re: Thickness density units

<t>More mass=more shielding. This can be achieved by using more dense materials or more of them in the path of the radiation (thickness). At the same physical thickness, lead provides many times the shielding of Aluminum because it is many times more dense.<br/> <br/> Using these units, one does not...
by Frank Sanns
Sun Feb 01, 2004 3:25 pm
Forum: Vacuum Technology (& FAQs)
Topic: Some pumps
Replies: 20
Views: 5005

Re: Some pumps

<t>Adam,<br/> <br/> Find an old refrigerator and pull the pump. Use this single stage pump as your roughing pump. Then buy a small used diffusion pump on ebay or from surplus for another $30-$50. <br/> <br/> Diffusions pumps can work even at mediocre 200+ mtorr single stage roughing pump pressures. ...
by Frank Sanns
Sat Jan 31, 2004 4:11 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: What's so Special about Relativity Anyway?
Replies: 26
Views: 4999

Re: What's so Special about Relativity Anyway?

Larry,

So what happened to the 1/2? I think i knew at one time but it escapes me now.
by Frank Sanns
Mon Jan 26, 2004 10:52 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma Imaging?
Replies: 3
Views: 1566

Re: Gamma Imaging?

<t>Here are 2 pictures that show some of the emissions going on inside of the fusor.<br/> <br/> The first picture shows an outer lattice grid glowing red from electron bombardment. This is not thermal glowing as the outer grid is NOT very hot. Also there is much UV and blue from the air in the fusor...
by Frank Sanns
Sat Jan 24, 2004 5:30 pm
Forum: Vacuum Technology (& FAQs)
Topic: Some pumps
Replies: 20
Views: 5005

Re: Some pumps

The vacuum pump is complete (all parts there and working). Paint is in good shape. Pump was used infrequently. When it was used it was it was used with a cold trap.