Search found 47 matches

by Nnnnnnn
Sat Dec 01, 2018 4:17 pm
Forum: Advanced Technical Discussion Area
Topic: Alternative Reactor Design
Replies: 25
Views: 8679

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 Nnnnnnn
Fri Nov 30, 2018 5:41 pm
Forum: Advanced Technical Discussion Area
Topic: Alternative Reactor Design
Replies: 25
Views: 8679

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 Nnnnnnn
Sun Dec 17, 2017 1:59 pm
Forum: Vacuum Technology (& FAQs)
Topic: Turbomolecular Pump Controller V2
Replies: 1
Views: 1370

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 Nnnnnnn
Sun Nov 12, 2017 6:35 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Criticize my HV supply design
Replies: 26
Views: 9636

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 Nnnnnnn
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: 7690

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 Nnnnnnn
Fri Oct 20, 2017 6:16 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Criticize my neutron detection setup
Replies: 18
Views: 6551

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...
by Nnnnnnn
Mon Oct 16, 2017 10:39 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Multiplier Issue
Replies: 29
Views: 7494

Re: High Voltage Multiplier Issue

One more thing. You could get get 200kV referenced to ground. To do this you would have to float the centertap and ground the bottom connection. If floating the centertap results in a floating case this is a terrible idea of course. The reason I mention this is because 200kV "floating" could generat...
by Nnnnnnn
Mon Oct 16, 2017 8:39 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Multiplier Issue
Replies: 29
Views: 7494

Re: High Voltage Multiplier Issue

Dennis, yep that is what I thought. The drawing where I left the lower terminal floating is different from your drawing where you ground both the center tap and the lower terminal however it does generate the same output. In that case your lower terminal is connected to ground via the VM. Your cente...
by Nnnnnnn
Mon Oct 16, 2017 7:33 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Multiplier Issue
Replies: 29
Views: 7494

Re: High Voltage Multiplier Issue

Dennis, if the grounds in NST2 are the same (e.g. earth ground), then it is what I said above. To me it does look like that is what you are doing. In that case you just shorted the lower half of the transformer together (lower winding and centertap @ same potential), so it is the same as just connec...
by Nnnnnnn
Mon Oct 16, 2017 6:07 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Multiplier Issue
Replies: 29
Views: 7494

Re: High Voltage Multiplier Issue

Dennis, from the drawing and your short explanation I think you are getting exactly what I would expect. If I understand correctly this is your circuit: VM.jpg In the above case the ground and therefore the centertap is connected to D1 and C2 (your drawing). The centertap is our 0 (reference), while...