Search found 13 matches

by Martijn Rambonnet
Sat Sep 07, 2013 8:55 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

Re: RMR-Farnsworth Fusor 5

To provide some closure to this thread: We found that the low neutron results could be primarily explained by DH contamination, probably due to H2O dissolving into the D2O from the air. Our D2O supply was running low and when using too small amounts of D2O in the PEM cell a steadily increasing DH pe...
by Martijn Rambonnet
Sat Sep 07, 2013 8:54 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Hydrogen drying
Replies: 14
Views: 5127

Re: Hydrogen drying

We also have used a PEM cell to produce D2 from D2O and have done a residual gas analysis using a Balzers QMG-064. See http://www.fusor.net/board/viewtopic.php?f=6&t=8516 for some RGA plots and results. DO and D2O contamination was in our case already relatively small (1/50) without a dryer. However...
by Martijn Rambonnet
Tue May 07, 2013 3:00 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Operating with a variable leak valve
Replies: 3
Views: 1789

Re: Operating with a variable leak valve

Hi Jim, We have the same valve but the original version made by Granville Phillips, named the Granville Phillips 216, and have done some research on these in the past which might be interesting for others considering this type of valve. It's a metal to metal seal valve that is electrically actuated ...
by Martijn Rambonnet
Mon May 06, 2013 9:19 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

Re: RMR-Farnsworth Fusor 5

Hi Steven, We have not yet tried to operate the fusor in the modes you described. As I think every fusioneer has experienced it is much easier to control the voltage than to control the current by varying the pressure (which is of course logical). We will give it a try to operate the supply in const...
by Martijn Rambonnet
Fri May 03, 2013 11:54 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

Re: RMR-Farnsworth Fusor 5

Peter, We did not degas the D2O but I do know that we usually don't find any significant peaks above 32 a.m.u. I also went through our logbook and I don't see any significant peaks around 44 a.m.u. in any previous scans we stored (the small leak or diffusion through o-rings, indicated by the N2 peak...
by Martijn Rambonnet
Fri May 03, 2013 9:47 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

Re: RMR-Farnsworth Fusor 5

Thanks for the information Richard, that sounds most interesting and I will try to look it up. Our idea was initially based on a paper by the University of Sydney (attached) who also did doppler shift spectroscopy on an IEC device. We have a monochromator in the mail that is factory spec'ed up to 0....
by Martijn Rambonnet
Fri May 03, 2013 8:19 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

Re: RMR-Farnsworth Fusor 5

Thank you all for the kind words. So far the project has taken a lot of effort but has also proven to be a very good and fun learning experience for us as engineering students with regard to particle physics, electronics, machining, vacuum technologies, radiation physics and even a little bit of che...
by Martijn Rambonnet
Fri May 03, 2013 10:36 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

Re: RMR-Farnsworth Fusor 5

The grid does seem to look a little bit warped in the two plasma photos but that is not something we observed in other pictures. The alignment of the rings is not perfect but the inherent construction and high stiffness of tungsten makes this very difficult. Ideally the grid should ofcourse be spot ...
by Martijn Rambonnet
Thu May 02, 2013 10:55 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: RMR-Farnsworth Fusor 5
Replies: 13
Views: 7674

RMR-Farnsworth Fusor 5

After our first neutrons ( http://www.fusor.net/board/viewtopic.php?f=6&t=3128&p=12638&hilit=martijn+bent&sid=64c928e9ce20a69b6a66a0d6b38a2b89&sid=9614d185627572a228977d5806433f76#p12638 ) with our first working fusor, the RMR-FF4, we pretty much completely blew up the x-ray transformer we used as a...
by Martijn Rambonnet
Fri May 27, 2011 10:58 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: First Bubbles!
Replies: 16
Views: 7382

Re: First Bubbles!

<t>Thank for the valuable information! When we find a new x-ray transformer we will certainly install the ballast resistors. The disadvantage of the extra heat is minor if it prevents zapping the diodes.<br/> <br/> We have not measured the (AC) signal kickback before the rectifying diodes but we did...