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Mass production anode layer ion sources for sale

Posted: Tue Dec 06, 2016 4:49 pm
by Andrew Seltzman
I will likely be having a e-machine shop make a mass production run of the anode layer ion source I designed for my fusor. I will be selling the ion source cores(the source itself without the conflat base plate) for $200ea, please post if you are interested in buying one.

Ion source development thread:
viewtopic.php?f=12&t=5011
http://www.rtftechnologies.org/physics/ ... source.htm
file.jpg

Re: Mass production anode layer ion sources for sale

Posted: Wed Dec 07, 2016 5:58 pm
by David Kunkle
This offer probably couldn't come at a better time for me. I'm up for one.
Do you have any idea what time frame for delivery?

Been looking at its construction on your website. Seems easy enough to construct the CF flange.
Looks like there is about a 1.4 mm gap around the source and the inside of the 2.75CF nipple it would insert into. Does the 1/8" alumina that connects to the 1/4" VCR gas feed seal in any way to the VCR? I may be missing something, but it appears that there is a gap between the two, and that gas can leak past everything and into the chamber.

Re: Mass production anode layer ion sources for sale

Posted: Thu Dec 08, 2016 2:39 am
by Garrett Young
What about offering a fully assembled source with conflat?

Re: Mass production anode layer ion sources for sale

Posted: Thu Dec 08, 2016 3:56 am
by Andrew Seltzman
I would be able to have sources ready in early January.

As far as the VCR goes, I've never fed gas into them, at fusor pressures ambient chamber pressure is fine.

I wouldn't be able to offer a conflat base plate myself, Sharon Vacuum quotes the machining/welding process for a base plate at $265ea + parts, so you would be looking at about $350 for a complete base plate.

Re: Mass production anode layer ion sources for sale

Posted: Thu Dec 08, 2016 5:08 am
by David Kunkle
I see- so it's basically recirculating the gas already in the chamber the way you've been using them?
The way the gas input is constructed, will all the input gas go thru the ion source or can some/most escape and get around into the chamber? Or is the gas input just meant to dump the gas into the chamber as in any regular fusor setup regardless of the ion source?

$350 for the base plate- ouch! I already have a blank 2.75 laying around and a HV feed thru. I've already worked out how I'll finish the construction for pretty cheap if this goes thru.
Does the source come with the hex standoff? I ask now only because they're cheap and I'm about to place an order with McMaster for a few other things anyway.

Thanks Andrew.

Re: Mass production anode layer ion sources for sale

Posted: Thu Dec 08, 2016 5:20 am
by Garrett Young
If the gas feedthrough isn't really being used, then maybe a standard MHV conflat feedthrough could be used with a single drilled/tapped hole.

Will the current (or alternate) standoff fit in the center of IFTMG022033 (http://www.lesker.com/newweb/feedthroug ... fm?pgid=cf)?

I think the 91075A174 has a max. diameter of 0.433in and the MHV pins are on a 0.87in circle, so this would provide a min. clearance of ~0.22in per side.

Re: Mass production anode layer ion sources for sale

Posted: Thu Dec 08, 2016 10:51 am
by Dan Knapp
The least expensive option for the flange is to buy a blank flange, drill and tap (NPT) the holes for the gas and HV, and use a spark plug for the feedthrough. There are still a few spark plugs available with a pipe thread.Those without access to a machine shop and tig welding capability could still make the flange this way. I built some of Andrew's ion sources this way several years ago. I'm away right now, but will post pictures and specifics when I return.

Re: Mass production anode layer ion sources for sale

Posted: Thu Dec 08, 2016 11:00 pm
by Richard Hull
Deep reach spark plugs are still a very viable insulator for vacuum work provided the voltage isn't over about 5 or 10kv. They will have to be reworked to a greater or lesser degree. Threading taps for spark plugs are common and easy to obtain as there are only a few types of "standard" threadings. Sealing is rather easy for vacuum use, as well.

Richard Hull

Re: Mass production anode layer ion sources for sale

Posted: Mon Dec 12, 2016 10:17 pm
by Andrew Seltzman
Sharron vacuum will do the welding+leak check for $90, if you do the machining and provide the parts. There are some electrical feedthroughs on ebay:
http://www.ebay.com/itm/MDC-2-75in-CF-C ... Swux5YTFYN

http://www.ebay.com/itm/HPS-MKS-Conflat ... Sw5cNYOugz

http://www.ebay.com/itm/NEW-9462005-Ins ... Sw3mpXL0Xo

http://www.ebay.com/itm/NEW-9462001-Ins ... Sw~oFXH-WP

http://www.ebay.com/itm/NEW-KURT-J-LESK ... xyEHxRInra

The orders for the pole pieces and casings have been placed, they should ship to me on Jan 5th.

Re: Mass production anode layer ion sources for sale

Posted: Mon Dec 12, 2016 10:30 pm
by Garrett Young
Andrew,

I'm interested in purchasing one of the ion source cores.