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Re: Anode layer ion source. Operation pictures

Posted: Wed Nov 01, 2017 6:56 am
by Finn Hammer
Andrew,
Please excuse my presence in this very advanced thread, but I have been looking for an opportunity, for a while, to ask why the anode was supported by only 3 screws, leaving the 4th. hole vacant.
I guess this post answers that.

Cheers, Finn Hammer

Re: Anode layer ion source. Operation pictures

Posted: Wed Nov 01, 2017 2:12 pm
by Andrew Seltzman
Finn,

The original reason for the vacant hole was to allow a gas feed to come in through the back of the ion source, also the first ion source prototypes were hand machined, so the looser tolerances made the fasteners more likely to bind with the lower machining tolerances; only having three mounts reduced this probability. The original anode ring was also welded to threaded rods, so this would have been one less weld.

Re: Anode layer ion source. Operation pictures

Posted: Wed Jan 02, 2019 6:54 pm
by Andrew Seltzman
A patent has been granted on the use of a keep alive electrode to decrease startup time:
http://pdfpiw.uspto.gov/.piw?PageNum=0& ... LRPgD8lPts

Re: Anode layer ion source. Operation pictures

Posted: Sat Mar 23, 2019 7:48 pm
by Andrew Seltzman
I have a mass-producible base-plate design for the anode layer ion source using an aluminum cutout from Front Panel Express
IMG_20190320_235610180a.jpg
A hermeticallly sealed Pasternack PE4077 BNC connector is used as the HV feedthrough. It's rated to 500v with a dielectric withstanding voltage of 1500v, however I have run it for extended time at 1000v and shortly to 1700v without problems
IMG_20190320_235626288_HDRa.jpg
Ion source mounted on testbed
IMG_20190320_234942510a.jpg
ion source running with baseplate
IMG_20190320_235000977a.jpg

2.75" blank conflat flange outline for Front Panel Express if anyone wants to make their own custom feedthrough flanges
http://www.frontpanelexpress.com
2.75CF_outline.zip
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