Search found 58 matches

by Niels Geerits
Sat Dec 01, 2018 4:17 pm
Forum: Advanced Technical Discussion Area
Topic: Alternative Reactor Design
Replies: 25
Views: 6422

Re: Alternative Reactor Design

John, I deleted the quote. Assuming the information is stored as ascii that saved around 1.4kB (50n$). So I guess it is more about personal preferences, but since I don't pay I will abide by the hosts rules. Ironically discussing noise generates noise. I think these three posts distract more from th...
by Niels Geerits
Fri Nov 30, 2018 5:41 pm
Forum: Advanced Technical Discussion Area
Topic: Alternative Reactor Design
Replies: 25
Views: 6422

Re: Alternative Reactor Design

There actually is a continuous spallation source at PSI. I think it produces about 1 order of magnitude fewer neutrons than the ILL reactor. Though other spallation sources are pulsed, this can be advantagous depending on your application, since the pulsed nature gives you wavelength resolution. So ...
by Niels Geerits
Sun Jun 17, 2018 3:16 pm
Forum: New User Chat Area
Topic: Materials List
Replies: 1
Views: 983

Re: Materials List

Hey David, My Fusor is not complete but I noticed a few things in your list. You can do cheaper on your high vacuum pump. I got an old turbo for 150$ and restored it + built the driver for it for about 100$. For the pressure just get an MKS901P, you can get them for around 50$ and they have built in...
by Niels Geerits
Sun Dec 17, 2017 1:59 pm
Forum: Vacuum Technology (& FAQs)
Topic: Turbomolecular Pump Controller V2
Replies: 1
Views: 568

Turbomolecular Pump Controller V2

I would like to share the second version of my TMP controller. I would like to thank Jeroen Vriesman (also present on the forum) and Jerome for helping me in my design of the constant current source and for helping me understand the hall sensor. As I stated this new design uses a constant current so...
by Niels Geerits
Tue Dec 12, 2017 11:29 pm
Forum: New User Chat Area
Topic: X radiation exposition
Replies: 11
Views: 3304

Re: X radiation exposition

The current voltage and pressure combination you mentioned seems unlikely to me. See the following FAQ http://www.fusor.net/board/viewtopic.php?f=24&t=2795 At 1 Torr and 5mA you he only had about 400V across his fusor. Your voltage was probably also in the ~1kV range. As for a formula. You can come ...
by Niels Geerits
Wed Nov 15, 2017 4:17 pm
Forum: Please Introduce Yourself
Topic: Greetings!
Replies: 15
Views: 2065

Re: Greetings!

Great that simplifies things! Didn't expect it would come with a controller at such a low price. The fact that your meter starts at 1000 Microns is good, probably goes down to something like 10 microns? If you hook it up to your pump correctly, you will probably get some reading, which will tell you...
by Niels Geerits
Wed Nov 15, 2017 2:39 pm
Forum: Please Introduce Yourself
Topic: Greetings!
Replies: 15
Views: 2065

Re: Greetings!

Welcome Samuel, depending on your TC and pump you may or may not measure something. Some TCs will work in the 5 Torr (such as the DV-4), others only start giving you a useful reading below the 100 micron range. I don't know if a single stage pump can get down below 100 microns. In addition some TCs ...
by Niels Geerits
Sun Nov 12, 2017 6:35 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 4524

Re: Criticize my HV supply design

Hi Silviu, Great post! I might be repeating what others have already said. I also built my own working HVPS using a half bridge, a ferrite toroid and a CW Multiplier (40kV. 10kV @ 50mA is the most I have used for now). Now I am going to change the Inverter to a push pull type circuit with a center t...
by Niels Geerits
Tue Oct 24, 2017 6:26 pm
Forum: Vacuum Technology (& FAQs)
Topic: Silicone tubing with hose barbs OK to pull low vacuum?
Replies: 27
Views: 3401

Re: Silicone tubing with hose barbs OK to pull low vacuum?

Shireesh, my pump is 1/4" flare. If you want to go to any other connection type you need a special adapter. I got a flare to 3/8" BSP adapter it comes with a piece of copper that you have to put in between the flare and the adapter to get a good seal. I had to contact the pump manufacturer to get th...
by Niels Geerits
Fri Oct 20, 2017 6:16 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Criticize my neutron detection setup
Replies: 18
Views: 3227

Re: Criticize my neutron detection setup

I can say a few things about moderators. Moderators are used to turn fast neutrons into thermal (slow) neutrons. This means that you only want a moderator if you expect to have more fast neutrons than thermal neutrons, like in a fusor. For your source you can look at this report http://digitalschola...