Fusor Forums

Nice! Stick with it. My friend and I spent ~1.5-2 years messing around with a demo fusor before we really got things moving on a real, neutron producing fusor.

These two pictures I attached were taken approximately 7 years apart.

I am curious why the tungsten needle in your ion source is at a negative bias with respect to the shell? I would also suggest a single hole or group of holes around the center axis, rather than many perforations. I have attached a picture of a successful deuterium ion source I have built. 1.2 kV acr...

Luke, I am not familiar with the Canberra units, but my friend Jay Howson is. Below is a writeup he did on our website of how he made use of the Canberra modules for spectroscopy: http://www.nuclearphysicslab.com/npl/npl-home/spectroscopy/software_and_hardware/diy-canberra-system/ Sorry if this does...

Robert,

It is likely a rotatable conflat. He will have to insert the inner SS ring with the knife edge. It looks like the feedthrough is welded or Silver Soldered to the outer SS ring. Look at the picture I attached for reference.

Scott

Hi everyone, Over the past few weeks our amateur science group (Tim Koeth, Jim Krutzler, Jay Howson, Brian Beaudoin, Miriam Hiebert, Luke Gilde, and myself) have assembled a website which details all of our projects. It is still a work in progress (and will continue to be), but a lot of content has ...

Ian,
A brand new Pfeiffer Pumping station is $500 cheaper than the Mcmaster listing on IdealVac: https://www.idealvac.com/NEW-Pfeiffer-H ... pp/P107317

Still not affordable for the amateur, but available nonetheless.

Scott

I am by no means disagreeing with the statement: would "devour Deuterium like a vacuum cleaner." However, it is worth noting that larger systems maintain star mode at lower pressures. The fusor Tim Koeth and I built (larger than that chamber) maintains star mode between 2-4 mTorr. My 9" spherical ch...

Roberto, To your first question: yes, the bottom of the glass tube is the gas inlet Second question: Yes, I have read about those ratios. The spacing was increased for that photo to demonstrate variability. Ultimately the spacing will be based on a SIMION model I have built of the entire beam line. ...

Ian,

The ceramic on the Einzel Lens is Macor. The first and third electrodes of the lens are grounded and the middle is at a positive potential (400-1kV depending on desired focal length).

Scott

Ian, The ceramic is a high voltage break, electrically isolating the ion source from ground and allowing it to float at 20kV. See the full CAD rendering with a circuit below. The voltage drop across the diodes allows for a DC plasma discharge, and the voltage drop across the resistor is the extracti...