Ion Gun Design and Construction

Re: CRT Electron Gun Modification

Mon, 06 Sep 2010 00:50:42 GMT

Hi Jerry,
Not really like TorrSeal as I dont believe its an epoxy . Its almost like plaster or sheetrock, but harder. I cant imagine it would ever be used to seal anything, but apparently it works good as a temperature and electrically resistant ...

Re: CRT Electron Gun Modification

Sun, 05 Sep 2010 22:43:10 GMT

Probably something along the lines of torrseal.

CRT Electron Gun Modification

Sun, 05 Sep 2010 18:15:53 GMT

Pictured below is the gun assembly (minus the deflection plates) from a 2AP1 CRT. Upon inspection of the gun, I noticed the assemblers used a type of ceramic to "glue" the focus anodes onto their support structure. The ceramic is quite ...

Re: Ion Source Aiming

Mon, 23 Aug 2010 07:08:10 GMT

Tyler,

Why don't you try something like this.

http://www.fusor.net/board/view.php?bn=fusor_ionguns&key=1241953556&first=25

Basically you need a two wire feed-through and a filament of some description, with a ...

Re: Ion Source Aiming

Mon, 23 Aug 2010 06:17:57 GMT

>Any idea what the discharge in this ion source looks like?
Unfortunately there is no flange configuration that would allow me to view the discharge.

>Also, what polarity is the central electrode in the source?
The electrode has ...

Re: Ion Source Aiming

Mon, 23 Aug 2010 03:17:21 GMT

Hi Tyler,

Any idea what the discharge in this ion source looks like? It might be spatially quite diffuse and / or non-uniform. Also, what polarity is the central electrode in the source? And if you change or turn off the solenoid ...

Re: Ion Source Aiming

Sun, 22 Aug 2010 23:55:55 GMT

First, the winding is only an issue for the uniformity of the field within the coil but this is not causing your real problem - the main issue is that any electric coil (even perfectly wound) will act as a defocusing lens (divergence) once any ions ...

Re: Ion Source Aiming

Sun, 22 Aug 2010 20:13:15 GMT

No, there is no extraction electrode since the ions are made right at the edge of the reaction chamber in a large pipe, there didn't seem to be much need or even practical way to make an extraction electrode.

I will try to work on the ...

Re: Ion Source Aiming

Sun, 22 Aug 2010 20:11:47 GMT

It would seem at first glance that this is a focusing issue Tyler.

The haphazard coil probably plays a part.

Do you have an extraction electrode as such?

Ion Source Aiming

Sun, 22 Aug 2010 19:56:28 GMT

I started testing a new ion source yesterday which consists of an electromagnet around a flange and an electrode in the flange, a fairly basic DC magnetron. But the thing is, it seems like the ions aren't coming out aimed in the correct ...