Search found 136 matches

by Maciek Szymanski
Wed May 27, 2020 12:46 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Diy linear accelerator
Replies: 16
Views: 2709

Re: Diy linear accelerator

Here you are an article about one of the first drift tube liniacs (when they were just couple of laboratory glassware, coper wires and shellac seals) "The production of high speed canal rays without the use of high voltages" by E.O.Lawrence and D.H.Sloan. With this desktop setup they got ion energie...
by Maciek Szymanski
Thu May 14, 2020 7:57 am
Forum: Vacuum Technology (& FAQs)
Topic: Foreline valve and trap - what is neccesary?
Replies: 13
Views: 3071

Re: Foreline valve and trap - what is neccesary?

From my experience the fore line isolating valve is used in the situation when the turbo is kept under the vacuum. I have some systems without gate valve between the chamber and the turbo, and at the system shutdown the chamber with turbo is isolated from the roughing line. With dry (scroll) pumps j...
by Maciek Szymanski
Mon Apr 27, 2020 1:31 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 90
Views: 19156

Re: Jim Kovalchick -My attempt at smaller fusor

You can place a grounded metal mesh behind the viewport (vacuum side) to drain the eclectrons. It doesn’t have to be very dense, so it will not impair the camera image that much.
by Maciek Szymanski
Mon Apr 27, 2020 12:50 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 90
Views: 19156

Re: Jim Kovalchick -My attempt at smaller fusor

I don’t think that a magnet can help. I suppose that the x-rays are produced not by the electrons impacting the glass but rather by the electrons impacting the metal shell on the opposite side. The viewport just passes them out as opposed to the metal chamber walls.
by Maciek Szymanski
Sat Apr 18, 2020 10:10 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Somber musings while self-isolating
Replies: 1
Views: 1562

Re: Somber musings while self-isolating

My opinion on fusion research may be of course influenced by fact, that my salary depends on it (most of funding of the institute I’m working for is from the Eurofusion program). Because of this I shouldn’t be skeptical, but I really doubt that we will get a working economically feasible fusion powe...
by Maciek Szymanski
Fri Apr 17, 2020 7:01 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 26
Views: 6304

Re: FUJ-219 Magnetically Assisted Ionization fusor

Today I’ve chance to use the big TOS lathe, so I’ve finally started to build the main chamber. The flange was made from a laser cut blank, which was machined from both sides. On the inner hole a shoulder was machined to accept the straight tube segment. Then the whole thing was TIG welded: first all...
by Maciek Szymanski
Sat Apr 11, 2020 8:48 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 26
Views: 6304

Re: FUJ-219 Magnetically Assisted Ionization fusor

Once I was very involved with photography. Then, when the digital cameras and especially phones with camera become popular I’ve given it up - I’ve feeling that there is so much photographic images everywhere, so there is no sense for me to take one more. But lately I’ve realized, that most of the ph...
by Maciek Szymanski
Sat Apr 11, 2020 8:26 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Density of a plasma
Replies: 9
Views: 3309

Re: Density of a plasma

In a typical self-ionizing fusor you are trying to put some contradicting ideas to work: 1. You want to have the MFP long enough to accelerate your deuterons to highest possible energy before they collide with other deuteron or neutral. That means you need a LOW pressure. The rate of collisions depe...
by Maciek Szymanski
Fri Apr 10, 2020 8:10 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V construction - the process long running
Replies: 48
Views: 19220

Re: Fusor V construction - the process long running

That's a pity Richard. I was looking forward to your results with the electrostatic ion guns. I was expecting reputable data from a well conducted experiment, as all your efforts. I hope you are planning those with your new V.
by Maciek Szymanski
Fri Apr 10, 2020 7:55 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 26
Views: 6304

Re: FUJ-219 Magnetically Assisted Ionization fusor

Today I was finally able to do some welding. So I’ve at last the cathode assembled with mesh widows and ion apertures. The most problematic was tapping 16 M2 holes in the stainless steel. As always, just after assembling it I’ve an idea to improve the cathode openness - it is possible to add two mor...