Search found 49 matches

by Noah C Hoppis
Sat Sep 23, 2017 5:07 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: COMSOL simulation of a FUSOR?
Replies: 23
Views: 22993

Re: COMSOL simulation of a FUSOR?

IBSimu is a very good option for ion source extractor and accelerator geometries. I've used it to poke around an ECR ion source extractor with good results. I'm not sure how well it would fair with spherical geometries allowing for orbitals. A "kill" function for prolonged life ions may be necessary...
by Noah C Hoppis
Sat Apr 29, 2017 2:39 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Ask me about plasm physics
Replies: 5
Views: 7784

Re: Ask me about plasm physics

In an attempt to keep it fusor related I aimed for general, although more and more I notice posts that are labeled "not fusor related" are let pass. I digress. In general I'm interested in beams in particle accelerators, around the ~1mA beam current mark. The hope would be to design some lensing to ...
by Noah C Hoppis
Fri Apr 28, 2017 7:45 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Simple direct accelerator, using Pd as a deuterium source
Replies: 3
Views: 5289

Re: Simple direct accelerator, using Pd as a deuterium sourc

I have in the past wondered if the reservoir from a deuteron thyratron could be abused as a small deuterium source. In junction with a pyroelectric crystal a compact low flux source might be possible. Armchair musings. Also, one may not actually be able to drain meaningful deuterium from the reservo...
by Noah C Hoppis
Fri Apr 28, 2017 7:33 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Ask me about plasm physics
Replies: 5
Views: 7784

Re: Ask me about plasm physics

It may be slightly outside of a plasma physicists purview:
Do you have any good references or recommendations for mathematics concerning beam transport and optics? Mainly concerning on source extraction, and deleterious effects on an unconstrained beam.
by Noah C Hoppis
Tue Oct 11, 2016 6:53 am
Forum: Images du Jour
Topic: Muhammad Faidzul Demo Fusor
Replies: 15
Views: 9744

Re: Muhammad Faidzul Demo Fusor

The electrical conductivity of a gas at a given pressure is characterised by paschen's law (https://en.wikipedia.org/wiki/Paschen%27s_law). The mechanics involved can be somewhat complex, but in effect at 'high' pressures voltage breakdown is proportional to pressure, but at low pressures this relat...
by Noah C Hoppis
Tue Oct 04, 2016 2:58 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Forced vibrations in EM-wave? What will happen?
Replies: 10
Views: 5903

Re: Forced vibrations in EM-wave? What will happen?

Sum the vectors to find the resultant. Quantum mechanics makes things more nasty, but if you've chosen to work with an electron as a particle, forces still play relatively nice.
by Noah C Hoppis
Tue Jan 27, 2015 7:04 pm
Forum: Vacuum Technology (& FAQs)
Topic: Stainless 8” Bell Jar liner
Replies: 6
Views: 3384

Re: Stainless 8” Bell Jar liner

Ohhh! the blue light is so shiny though...
by Noah C Hoppis
Mon Dec 29, 2014 3:55 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Attach NST Output to NST Input
Replies: 8
Views: 4491

Re: Attach NST Output to NST Input

NSTs are great factory limited Hv sources but they are also complex, sensitive little snowflakes. They tend to internally short fi prodded above ~140 Vac. The main mode of failure in this scheme would be internal shorting due to over-volting, and unless you were willing to rebuild an NST (thereby de...
by Noah C Hoppis
Fri Oct 10, 2014 5:39 pm
Forum: Vacuum Technology (& FAQs)
Topic: Teflon Tape and Vacuum grease
Replies: 12
Views: 9053

Re: Teflon Tape and Vacuum grease

I've seen JB weld used well before, Just make sure it isn't directly connected to high voltage or in the way of plasma
by Noah C Hoppis
Sun Aug 03, 2014 6:44 am
Forum: Vacuum Technology (& FAQs)
Topic: Needle Valve
Replies: 4
Views: 2695

Re: Needle Valve

A google search yielded that the flow coefficient for that valve is .73 Cv, flow coefficient is derived from pressure drop, specific gravity (.139 for deuterium) and rate of flow you want in the 20 SCCM range. The equation is on wikipedia.