Search found 2329 matches

by Carl Willis
Thu Jul 25, 2013 5:57 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Physical explanations for demo fusor power supply
Replies: 4
Views: 2571

Re: Physical explanations for demo fusor power supply

Hi Joe, A DC power supply is specified because by maintaining the grid at a negative potential with respect to the shell, it will attract ions that can collide near or within it at high velocities and fuse there. The conventional theory of fusor operation holds that energetic ions will be trapped in...
by Carl Willis
Mon Jul 01, 2013 6:00 pm
Forum: Fusion --- Past, Present, and Future
Topic: NWNC 2013 School Year End & News Letter
Replies: 4
Views: 3078

Re: NWNC 2013 School Year End & News Letter

Great job, Carl.

You've pioneered a new, innovative model for nuclear education, and it's clearly working well. I hope it's an example others will build on around the world. Great newsletter! Welcome to the seven new students; I hope we get to meet each of you on this forum.

-Carl Willis
by Carl Willis
Mon Jul 01, 2013 5:33 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Please Take The Time To Read
Replies: 21
Views: 7420

Re: Please Take The Time To Read

Hello Charlie, Your first priority as a 15-year-old interested in a fusion project should be to find a local mentor who is at least knowledgeable in electrical safety and willing to work with you. University physics departments, national labs, and private industry are all good places to look for hel...
by Carl Willis
Wed Jun 26, 2013 6:28 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Home-made Variac
Replies: 8
Views: 4940

Re: Home-made Variac

This is a resistive ballast, and fundamentally functions differently than a transformer. It may or may not suit your needs. Consider one difference: if you power an unloaded 15kV transformer via this ballast, the output voltage will be close to 15kV throughout the entire control range, whereas if yo...
by Carl Willis
Sat Jun 15, 2013 3:25 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Increasing neutron detection
Replies: 10
Views: 6211

Re: Increasing neutron detection

There's not much point in considering radiation shielding until an actual problem has been specified. The day may come when you find yourself with 100 mrem / hr at your operating position, or you have a sodium iodide scintillator set up in the immediate vicinity of the neutron source and need to kee...
by Carl Willis
Sat Jun 15, 2013 2:26 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Increasing neutron detection
Replies: 10
Views: 6211

Re: Increasing neutron detection

This all depends on the detector principle. Some detectors (the BTI PND dosimeter, for instance) are recoil detectors and work best with no moderator. For detectors that operate on the principle of capturing neutrons and emitting charged particles (He-3, B-10, Ag, etc.) moderator thickness has an op...
by Carl Willis
Fri Jun 14, 2013 4:53 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Calibrated Gas leaks
Replies: 4
Views: 1729

Re: Calibrated Gas leaks

Flow rates are often specified in sccm or sccs (standard cubic centimeters per minute or per second). Cubic centimeters are obviously volume dimensions; "standard" implies that the pressure of this volume is atmospheric (760 torr, 1 bar, 101 kPa, etc.). The dimensions of sccm / sccs are thus pressur...
by Carl Willis
Fri Jun 14, 2013 2:23 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Harnessing power from fusor
Replies: 5
Views: 2154

Re: Harnessing power from fusor

Measuring neutron output is by far the easiest measurement of actual fusion rate that has been identified to date.

Direct detection of the reaction heat, i.e. calorimetry, is not practical.

-Carl
by Carl Willis
Fri Jun 14, 2013 1:47 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Harnessing power from fusor
Replies: 5
Views: 2154

Re: Harnessing power from fusor

Not practically. It has to be regularly mentioned in these forums that fusion power released in even the best performing amateur fusors amounts to a few microwatts--far too little to be directly detectable--and that a large portion of that energy is in the motion of neutrons that leave the chamber a...
by Carl Willis
Fri Jun 14, 2013 4:50 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: First Light on 6-12-13 Warren High School
Replies: 2
Views: 1640

Re: First Light on 6-12-13 Warren High School

Hi John,

Congratulations on this milestone, despite a few setbacks thrown in your way. "First light" is a great feeling, and I am glad your ambitions will take you farther in this project even though school's out for the year.

-Carl