Search found 60 matches

by henryhallam
Thu May 26, 2005 11:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: what shoud i make? ideas that need testing?
Replies: 23
Views: 4122

Re: what shoud i make? ideas that need testing?

<t>Whatever you choose to do, put a lot of effort into the instrumentation. It has been the most difficult part of our project and is worth doing properly if you want to record real data. Interference is a bitch! We are now on our third generation of data collection PCBs, fingers crossed these will ...
by henryhallam
Thu May 26, 2005 11:39 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: What position, the fusor?
Replies: 3
Views: 1791

Re: What position, the fusor?

<t>You have pretty closely described the setup Fergus and I are using (with the exception of the HV supply which is under the bench). Everything is stacked vertically and vacuum conductance is very high - so high that we have had to add a "choke" to the diff pump to avoid using too much deuterium in...
by henryhallam
Sun Feb 27, 2005 8:50 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Hirsch's 10^12 n/sec machine, moved from Ion Gun Forum
Replies: 4
Views: 2949

Re: Hirsch's 10^12 n/sec machine, moved from Ion Gun Forum

<r>"A factor of 150. Is that closer to breakeven than what the big labs are achieving?"<br/> <br/> No, the <a href="<URL url="http://www.jet.efda.org/%22%3EJoint">http://www.jet.efda.org/">Joint</URL> European Tokamak</a> approached fusion energy breakeven in 1997 I think, with something like 16MW o...
by henryhallam
Fri Feb 25, 2005 12:48 am
Forum: Images du Jour
Topic: Acrchived - Fusor IV - picture group 2
Replies: 2
Views: 5071

Re: Acrchived - Fusor IV - picture group 2

<t>Very impressive setup Richard.<br/> And a nice touch there with the Farnsworth monitor.<br/> <br/> Fergus and I are going to be back in the fusion game within a few days as exam pressures are now over. More importantly we're getting new diff pump oil to fix the system after a rather nasty (and st...
by henryhallam
Sun Jan 23, 2005 1:30 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Another ineresting website
Replies: 2
Views: 2206

Re: Another ineresting website

<t>Looks like another load of bullshit to me. <br/> <br/> "...In a special case wherein the gravitational potential energy density of a blackhole equals that of the Plank mass, matter converts to energy and spacetime expands with the release of a gamma ray burst. The singularity in the SM is elimina...
by henryhallam
Mon Dec 13, 2004 7:42 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Toroid xformer
Replies: 5
Views: 2177

Re: Toroid

<t>Pity you can't go for a voltage a little higher than that.. 30 or 35kV would make a world of difference in cranking out the neutrons. Too much current and not enough voltage just seems to make the grid get hot, on our system at least.<br/> <br/> I wouldn't expect insulation to really be too big a...
by henryhallam
Mon Dec 13, 2004 11:45 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: manditory parts needed
Replies: 10
Views: 2938

Re: manditory parts needed

<t>Much cheaper than an 8" conflat flange is an ISO flange - these use a rubber gasket instead of the copper. Fergus and I use a 10" one on our fusor without any problems right down to 10^-6 torr. Conflat is "nicer" but not really necessary for the relatively poor vacuums we are using - especially i...
by henryhallam
Sun Dec 12, 2004 12:39 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: MODERATORS
Replies: 11
Views: 3324

Re: MODERATORS

<t>As far as I'm aware nobody has tried Beryllium as a moderator, although it's a light nucleus and would probably work (having a small cross section for thermal neutron absorption) it's generally pretty toxic stuff. I believe it's used as a neutron reflector in nuclear bombs.<br/> Water has been us...
by henryhallam
Thu Dec 09, 2004 2:49 pm
Forum: Images du Jour
Topic: Achived - Henry & Fergus' first plasma
Replies: 6
Views: 5327

Re: Henry & Fergus' first Neutrons!!

<r>Thanks <E>:)</E><br/> <br/> Only trying to estimate a rough rate here...<br/> We were counting about 20cpm and the counter needle was hovering around 0.8 mrem/hour. According to Richard's FAQ (we need to consult the calibration data properly) this equates to around 5 n/cm^2/sec of flux at the cou...
by henryhallam
Thu Nov 25, 2004 3:51 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection construction
Replies: 23
Views: 6313

Re: Neutron detector digital scaler (WARNING: large picture)

Thanks very much Andrew. Will probably use same or very similar circuit on our Model 12 if that's ok with you.

Cheers

Henry