Other types of magnetron ion sources

For the design and construction details of ion guns, necessary for more advanced designs and lower vacuums.
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ian_krase
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Other types of magnetron ion sources

Post by ian_krase » Sun Oct 27, 2019 8:56 am

We've heard plenty about Andrew Seltzmann's very impressive and very advanced Anode Layer Ion Source.

But I, a person with somewhat lesser abilties, am interested in building something a bit different. To be specific, I'm interested in a magnetron ion source (please forgive me if the ALIS isn't actually a magnetron source)

In particular, I'm interested in something that would give something more like a point or spot source of ions, and that would require minimal machining and less specialized materials.


I've been looking at the Penning Ion Source presented here: http://www.rapp-instruments.de/Beschleu ... source.htm. The main thing that bothers me is that it seems like it would sputter (and heat) the magnet into oblivion (in contrast to the Seltzmann source where the magnets are both well-heatsinked and away from the plasma.)


Does anybody have any thoughts on this source?

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Richard Hull
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Re: Other types of magnetron ion sources

Post by Richard Hull » Sun Oct 27, 2019 7:42 pm

Rapp's work is well known here over the years and it is well done. First rate effort. However, you will notice the attention he paid to the waveguide cavity to avoid killing himself and the tuning slugs he included to make sure the energy was delivered where it was needed in the guide. A far safer but less powerful system is the link coupled vacuum tube setup shown. Carl Willis posted some years back on a ham radio transmitter link coupled ion source. Good, powerful ion guns or sources are major undertakings. This assumes you want milliamp beam energies. Kilowatt supplies are often demanded for milliamp ion sources.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

ian_krase
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Re: Other types of magnetron ion sources

Post by ian_krase » Sun Oct 27, 2019 10:19 pm

I'm talking about DC-only penning ion sources. Not a microwave magnetron.

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Richard Hull
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Re: Other types of magnetron ion sources

Post by Richard Hull » Mon Oct 28, 2019 4:01 am

Your mentioned specifically you were interested in magnetron ion sources. Then you mentioned the specific reference to the penning systems. A huge gulf is affixed between the two. Not being argumentative and sorry if there was a misunderstanding on my part.

We had a great discussion at 2019 HEAS related to functioning penning systems being developed by Dan Knapp. A first rate talk. He may offer suggestions to you if he chooses. His work with another scientist does not to use them as an ion source, though that is what they do...His talk was about doing fusion within then. Very interesting concept and a work in progress with proof of the doing.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

ian_krase
Posts: 562
Joined: Mon Nov 28, 2016 7:48 am
Real name: Ian Krase

Re: Other types of magnetron ion sources

Post by ian_krase » Mon Oct 28, 2019 6:48 am

I think "magnetron" has sometimes been used specifically to refer to the microwave generating tube, and sometimes to various devices that use both electrostatics and magnetics such as my sputter magnetron gun, which is related to a penning ion source but does not use penning configuration.


I'm talking about a penning or Penning-like DC source.

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