Search found 10844 matches

by Richard Hull
Fri Aug 03, 2001 3:10 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Use a mirror to view poissor
Replies: 1
Views: 1703

Use a mirror to view poissor

<t>For those without a video camera and monitor to remotely observe the poissor in a real neutron producing fusor, I would suggest a mirror and telescope/monocular to avoid eye damage due to x-radiation.<br/> <br/> View ports spew terrible burning rays once above 15kev. You only need to place a cuti...
by Richard Hull
Fri Aug 03, 2001 3:51 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: recirculation - acceleration
Replies: 16
Views: 4409

Re: recirculation - acceleration -How good is it really?

<t>Devil's advocates are always welcome as they usually make us all think more deeply on issues. Recirculation does indeed help increase fusion chances especially at lower energies and in well designed systems made to take advantage of the process.<br/> <br/> Gunned systems and very applied high vol...
by Richard Hull
Thu Aug 02, 2001 1:45 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: recirculation - acceleration
Replies: 16
Views: 4409

Re: recirculation - acceleration

<t>We were talking about fusors in general, but I got the impression we were discussing the simple fusor working at 5-10 microns. Here the mean free path is real short, maybe a chamber radius or so, and re-circulation is just about non-existant. Only gunned systems working at 10e-4 torr or lower or ...
by Richard Hull
Mon Jul 30, 2001 5:44 pm
Forum: Fusion --- Past, Present, and Future
Topic: Mark II prime, Bob's fusor, The AEC demo fusor
Replies: 1
Views: 2442

Mark II prime, Bob's fusor, The AEC demo fusor

<t>The question has been asked why Gene Meeks mark II prime fusor was so much better than Bob Hirsch's fusor, etc.<br/> <br/> I will attempt to explain.<br/> <br/> There are only three real fusors of the ITT effort which were runaway sucesses compared to all previous units.<br/> <br/> One was the AE...
by Richard Hull
Thu Jul 26, 2001 9:29 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Victoreen 440 Survey Meter
Replies: 12
Views: 4821

Re: Victoreen 440 Survey Meter/Lamp Mantles

<t>I do a bit of TIG welding on the side in my lab for friends to make a few extra bucks to feed back into my projects and, personally, prefer only the thoriated electrodes. (1-2%)<br/> <br/> I am sure I am not exposed to the level of a welder on the line 8 hours per day, but am sure that the levels...
by Richard Hull
Thu Jul 26, 2001 9:09 pm
Forum: Vacuum Technology (& FAQs)
Topic: Real Life Reports from the Vacuum
Replies: 0
Views: 1633

Real Life Reports from the Vacuum

<t>I am so glad to see folks like Tom Dressel and others contributing actively. In the recent posts of his reply to the needle valve issue, he comments on the history of the chamber being a factor.<br/> <br/> This shows not so much that he has been there, but was there over and over again and took n...
by Richard Hull
Tue Jul 24, 2001 9:31 pm
Forum: Vacuum Technology (& FAQs)
Topic: Residual Gas analyzer Questions
Replies: 12
Views: 3147

Re: Residual Gas analyzer Questions

<t>The two messages about one KEY missing component is common in the surplus biz.<br/> <br/> It is normal for many companies and even government agencies to offer the units for sale at a fixed price as a working item in a special offering with all components cables, etc. If they fail to sell as work...
by Richard Hull
Tue Jul 24, 2001 3:10 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Semiconductor Counters
Replies: 3
Views: 1875

Re: Semiconductor Counters

<t>Before getting too excited, that 10e-3 efficiency is one in 1000 neuts counted. The BC720 bicron scintillator counts 1 in 144 and the average BF3 tube in a good moderator can count 1 in 100.<br/> <br/> The semiconductor doesn't sound all that good as presented by Marion, who, by the way, is the A...
by Richard Hull
Tue Jul 24, 2001 12:02 am
Forum: Vacuum Technology (& FAQs)
Topic: Residual Gas analyzer Questions
Replies: 12
Views: 3147

Re: Residual Gas analyzer Questions

<t>Yes, only a differentially pumped operation would work and save the RGA from taking a beating. <br/> <br/> However , NO, you can go ahead and use an RGA at micron levels just fine. Just measure its lifetime to expensive repair in hours.<br/> <br/> I was bummed to learn this myself about three yea...
by Richard Hull
Mon Jul 23, 2001 2:22 pm
Forum: Vacuum Technology (& FAQs)
Topic: Residual Gas analyzer Questions
Replies: 12
Views: 3147

Re: Residual Gas analyzer Questions

<t>I have a bit of knowledge regarding the RGA. Tom Ligon used a brand new SRS unit for the last three years.<br/> <br/> The RGA is not supposed to even be turned on until the pressure is 10e-5 torr!!! You will ruin the filament and gunk the unit up in minutes operating at 10e-3 torr or micron level...