Search found 111 matches

by Joe Gayo
Mon Jul 01, 2019 1:14 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

My -100kV @ 20mA power supply arrived on Friday ... Several Observations - - The chamber can support 90kV (so far ... more conditioning may improve) - I measure about 2E+6 n/sec/mA at 90kV ... multiple 3.6E+7 runs (90kV, 18mA, 19 mTorr) - Need to reposition detectors as not to saturate (110 bub in 6...
by Joe Gayo
Thu Jun 27, 2019 4:58 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

I'm still collecting data (the chamber is still improving with loading and vacuum quality), but here are some general results: 60 kV, ~1M n/sec/mA (16.2M at 15mA, Q = 2.11 e-8!), 25 mTorr I created this video to record results at 5mA (40 - 60kV), 22mTorr. https://youtu.be/1MLFN8FKvZc Performance @ 2...
by Joe Gayo
Mon Jun 24, 2019 10:21 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

@Jon - Thank you for the kind words and the tour of your impressive lab! @Everyone - I have a -100kV @ 20mA power supply arriving in the next few weeks and will begin experimenting with different cathode/anode materials. Based on some preliminary results the Aluminum construction may be contributing...
by Joe Gayo
Fri Jun 21, 2019 4:27 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

@Dan Sure it does ... it's an axially symmetric (RZ) code/solver. I actually, know the individual that wrote Starfish (his Ph.D.) and he and I are working together on simulations.
by Joe Gayo
Wed Jun 19, 2019 6:02 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

@Rex Yes, in this simulation the applied potential difference is 50kV. You are correct about the symmetry of the simulation as well. The animation represents microseconds. The software is Starfish (https://www.particleincell.com/starfish/ - Free!) @Carl Thanks! The electrode geometry is discussed in...
by Joe Gayo
Wed Jun 19, 2019 12:21 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

How about a PIC simulation that shows the time evolved potential field:
https://youtu.be/wEO5Ewo_H_w (Note: The cathode is at 0V and the chamber walls at 50kV)
by Joe Gayo
Tue Jun 18, 2019 9:55 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

The cathode is in the center along the axis of the magnetic field (the plot is oriented vertically but the actual layout is horizontal)

(P.S. I'm working on a paper that I planing on submitting to a journal to discuss this system.)
by Joe Gayo
Tue Jun 18, 2019 12:42 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

The axial field assists in the stabilization of the discharge and in a cylindrical system establishes a situation where the main axial beam is the preference for ions and electrons. I'm still developing tests to validate the following speculations: - Magnetic shielding of cathode - Improvement of io...
by Joe Gayo
Mon Jun 17, 2019 3:33 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

The 5 seconds was just to limit the total number of bubbles to a manageable number to count. The electronic detection indicates I can run at this level for about 60 seconds at the moment.
by Joe Gayo
Sun Jun 16, 2019 11:43 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 25133

Re: Joe Gayo's lab tour

** UPDATE ** 28 bub/mrem dosimeters confirm the following: 70 kV @ 12.8 mA, 19.5 mTorr D2, 12.6M n/sec TIER 75 kV @ 19.0 mA, 19.5 mTorr D2, 20.7M n/sec TIER I cycled the power for 5 seconds to limit the number of bubbles to make counting easier, but electronic detection verified the output level for...