## Search found 66 matches

Mon Apr 28, 2014 1:38 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Accelerator Tube Revisited
Replies: 23
Views: 9798

### Re: Accelerator Tube Revisited

I'm greatly looking forward to the outcome of this! What's the intended voltage source?
Thu Apr 24, 2014 12:05 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: isotropic neutron measurement
Replies: 13
Views: 5950

### Re: isotropic neutron measurement

I estimated the NVTH at ~50 from what I've seen out of that tube (It was used to verify 1st neutrons on my system), but could be considerably higher or lower. Further, I don't know the specifics of his calibration off hand.
Wed Apr 23, 2014 11:10 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: isotropic neutron measurement
Replies: 13
Views: 5950

### Re: isotropic neutron measurement

Yes, your math is right, though your units are a little screwy (though not unforgivably so) . As for my example, I rounded off the number I provided because the additional values weren't significant figures in the calculation and I'm not a mental math wizard.
Wed Apr 23, 2014 10:00 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: isotropic neutron measurement
Replies: 13
Views: 5950

### Re: isotropic neutron measurement

JakeWells, I don't know what the specific number Robert was using, and it doesn't matter. Here's how this works: 1) Imagine your neutron source as an infinitesimally small point shooting out neutrons in all directions. Imagine that there are N of them being emitted per second. 2) Now back up to an a...
Wed Apr 23, 2014 1:31 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: isotropic neutron measurement
Replies: 13
Views: 5950

### Re: isotropic neutron measurement

TIER=(4*pi*r^2)*(cps/nvth)

TIER= Total isotropic emission rate (n/s)
r= distance from fusor (cm)
cps= counts per second measured (most meters read in cpm, you have to convert)
nvth= cps in a field of 1 n/cm^2.s (varies based on the tube)
Tue Apr 15, 2014 1:58 pm
Forum: Images du Jour
Topic: Archived - Ag Kα X-ray Source
Replies: 3
Views: 1808

### Re: Ag Kα X-ray Source

Thanks Carl- Here's the first image I've taken:

Note that this is just a standard attenuation x-ray, as the patterned anodes have not been FIB'd yet.
Sun Apr 13, 2014 4:36 pm
Forum: Images du Jour
Topic: Archived - Ag Kα X-ray Source
Replies: 3
Views: 1808

### Archived - Ag Kα X-ray Source

Hello all- Thought I might give some updates on what I've been up to since heading off to college. In addition to my own projects( which I'll post pictures of at a later date), I've been hired to work on a x-ray imaging project. In lieu of attenuation-contrast, the idea behind this work is to use ph...
Sat Apr 12, 2014 7:10 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Gain factors of various fusion techniques
Replies: 10
Views: 5679

### Re: Gain factors of various fusion techniques

The simple answer is that we can't contain and compress fusion fuel while getting it hot enough to fuse without heroic efforts. When we can, it comes at the cost of the amount of time we can hold it there (NIF). There's something called the triple product (as related to the Lawson criteria) you shou...
Wed Apr 09, 2014 11:20 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Replies: 4
Views: 2938