Mass Production Anode Layer Ion Source


 

Overview:

The mass production anode layer ion source was originally developed as an ion source for the Mark 3 fusor, allowing neutron production rates up to 2.4e6n/s (as of fall 2016) and significant improvements in operation stability. The mass production version uses SmCo magnets instead of NdFeB magnets to allow high temperature(~300C) operation / bakeout and use in a hydrogen/deuterium environment without hydrogen embrittlement; NdFeB magnets will disintegrate after absorption of enough hydrogen. The Pole piece and case are CNC machined for closer tolerances and better reproducibility.

An anode layer ion source consists of a positively biased ring shaped anode between two grounded magnetic poles that create a radial magnetic field across the anode ring. Electrons drift above the ring due to the ExB force and ionize gas (either ambient or a controlled flow over the anode ring) which is then directed into a rind shaped beam. Anode layer sources have been used as satellite thrusters, plasma sources, for thin film deposition or surface treatment.

The ion sources are for sale for $300ea, e-mail me for availability.

 

Mass production ion source (3/25/2017)

 

 

Mass production ion source (3/25/2017)

Ion source in glass vacuum chamber to observe beam profile

 

Ion Source Specs:

Approximate performance curves of the anode layer ion sources.

  • Voltage: 0-4kV
  • Current: ~2mA
  • Pressure: 1E-4 torr to ~6E-2 torr
 

 

Mass production ion source (3/25/2017)

Diagram of ion source components.

 

Mass production ion source (3/25/2017)

Ion source assembly diagram.

 

Mass production ion source (3/25/2017)

Ion source cross section, front view.

 

Mass production ion source (3/25/2017)

Ion source cross section, rear view.

 

Mass production ion source (3/25/2017)

CNC machined ion source casings

 

Mass production ion source (3/25/2017)

Standoffs, pole pieces, anode rings, and insulators.

 

Mass production ion source (3/25/2017)

Ion source case

 

Mass production ion source (3/25/2017)

Set of 4 SmCo magnet rings (1/2"ODx1/4"IDx1/8"Thick)

 

Mass production ion source (3/25/2017)

SmCo magnet installed in case

 

Mass production ion source (3/25/2017)

Insulators placed on anode ring.

Note: nuts and insulators are installed through case in the following order:

  • 3x insulators inserted in holes in case from front
  • Anode ring inserted through insulators from front
  • Anode ring depth set by pressing down on ring face until insulator slides through shaft clips
  • Retaining shaft clips installed from rear of injector
  • Nuts screwed onto threaded rods
 

Mass production ion source (3/25/2017)

Insulators placed on anode ring.

 

Mass production ion source (3/25/2017)

Anode ring inserted through insulating rods

 

Mass production ion source (3/25/2017)

Retaining shaft clips and nuts installed

 

Mass production ion source (3/25/2017)

Pole piece and vented 10-32 screw

 

Mass production ion source (3/25/2017)

Pole piece and screw installed.

Note, shim washer is installed between pole piece and magnet.

 

Mass production ion source (3/25/2017)

Standoff installed.

 

Mass production ion source (3/25/2017)

Front of ion source

 

Mass production ion source (3/25/2017)

Set of 10 complete sources.

 

Mass production ion source (3/25/2017)

Ion source in test bed to observe beam profile

 

Mass production ion source (3/25/2017)

Ion source in test bed to observe beam profile

 

Mass production ion source (3/25/2017)

Ion source in test bed to observe beam profile

 

Mass production ion source (3/25/2017)

Ion source in glass vacuum chamber to observe beam profile

 

Mass production ion source (3/25/2017)

Ion source in glass vacuum chamber to observe beam profile

 
 

Mass production ion source (3/25/2017)

 

 
 

 

 
 

Useful links:

http://www.fusor.net/ Open Source Fusion Research Consortium.

 

 

 


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