Search found 42 matches

by Maciek Szymanski
Mon Jun 29, 2020 4:04 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 21
Views: 2838

Re: FUJ-219 Magnetically Assisted Ionization fusor

Today I’ve cleaned up the back side of the seam (outside of the chamber) and placed the back seam on both halves of the chamber. I’ve also layed out the positions of port holes according to the drawing and prepared the flange for the diffusion pump connection. Now I have to find the way to swap the ...
by Maciek Szymanski
Fri Jun 26, 2020 1:19 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 21
Views: 2838

Re: FUJ-219 Magnetically Assisted Ionization fusor

Today I’ve welded the lower part of the chamber. It needs some seam backside cleaning an all the ports can be fitted. Lower half of the chamber: 188B887E-9090-4928-BBC1-B983EEF1C2EC.jpeg Detail of the flange with the o-ring groove: B7B9B100-3027-4531-8BE3-3B98B2830EA7.jpeg Chamber halves fitted toge...
by Maciek Szymanski
Thu Jun 25, 2020 7:19 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 21
Views: 2838

Re: FUJ-219 Magnetically Assisted Ionization fusor

Making custom vacuum components is part of my job at Institute. With my fusor chamber I’m hoping to test some tricks and solutions for vacuum systems I can use later in other projects. But machining SS can be a nightmare. Looking at your photo I’ve realized that I’ve never worked on the “Bridgeport ...
by Maciek Szymanski
Wed Jun 24, 2020 9:14 pm
Forum: Images du Jour
Topic: FUJ-219 Magnetically Assisted Ionization fusor
Replies: 21
Views: 2838

Re: FUJ-219 Magnetically Assisted Ionization fusor

After break for other issues and return to normal work schedule I’ve finally returned to the construction process. Today I’ve machined the flange for the lower part of the chamber. What is left is the groove for the sealing o-ring. Machined flange after the lathe was all cleaned up from all the chip...
by Maciek Szymanski
Thu May 28, 2020 6:29 am
Forum: Announcements and Site Administration Topics
Topic: Coronavirus pandemic
Replies: 152
Views: 24051

Re: Coronavirus pandemic

Jim Kovalchick wrote:
Thu May 28, 2020 1:43 am
The infrastructure was there for weapons, so what?
So tax payers founded it. But sure - use of the enrichment installations for energy production is the the best use of those money wasted in the nuclear weapons.
by Maciek Szymanski
Wed May 27, 2020 3:37 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Diy linear accelerator
Replies: 16
Views: 1008

Re: Diy linear accelerator

Sorry, I’ve made a mistake in the link. It should work now.
by Maciek Szymanski
Wed May 27, 2020 12:46 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Diy linear accelerator
Replies: 16
Views: 1008

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: 1081

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: 10670

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: 10670

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.