Mark 3 Ion Injector


 

Overview:

Prototype ion injector design for the Mark 3 IEC fusion reactor. This ion injector is designed to be mass producible with commonly available parts and require only minimal fabrication. Injector will produce a concentrated beam of deuterium ions and operate at ambient chamber pressure. Filament will be held at +5kV and extractor cone will be grounded.

 

Ion Injector Tests

 

Thermionic Anode Components:

Thermionic anode will release electrons, ionizing deuterium in close proximity. Deuterium will then be accelerated through extractor cone into fusor.

 

Electrical Feedthrough:

316 ss wire is formed to support platinum filament and pass though a 1/8" OD 2 bore high alumina rod cut to 3/8" length.

 

Interior Support:

1/4" OD 1/8" ID High Alumina tube is cut to 3/8" length and slotted at one end to 1/8" depth. Filament feedthroughs lock into slotted section, preventing rotation.

 

Injector Rear Bulkhead:

Rear bulkhead consists of a 1/2" ID stainless steel hole finishing cap. Bulkhead mounts to ion injector body, centering filament.

 

Injector Rear Bulkhead:

2 bore HA feedthrough passes through bulkhead insulating the filament leads.

 

Exterior Support:

1/4" OD 1/8" ID High Alumina tube is cut to 2/8" length and slotted at one end to 1/8" depth. Filament feedthroughs lock into slotted section, preventing rotation.

 

Exterior Support:

Filament supports are aligned with slot.

 

Exterior Support:

Filament supports are bent at right angles, locking into external support. Interiors and exterior supports are compressed against bulkhead disk, firmly holding assembly in place.

 

Laser Cathode:

Burnt out laser cathode is adapted as high voltage filament feedthrough. Existing cathode is removed, feedthrough terminals are sanded, and sealing edge is polished. All external ports are sealed off.

 

Laser Cathode:

Filament connectors will attach to laser cathode connectors.

 

NW-40 Flange:

NW-40 long weld stubs will contain ion injector and mount to fusor shell.

 

Ion Injector Body:

Ion injector body consists of a 0.75" OD by 0.5" ID high alumina tube cut to 1.5" long. Extractor cone is constructed out of a swagelok fitting captured in a second bulkhead feedthrough.

 

Ion Injector Components:

Laser cathode, filament assembly, injector body, and extractor cone ready for assembly.

 

Ion Injector:

Deuterium ion injector is assembled and mounts to laser cathode header.

 

Ion injector:

Injector assembly mounts in NW-40 long weld stub.

 

Ion Injector Aperture:

Deuterium ions will exit though extractor cone, and aimed at the focal point of the accelerated plasma.

 

 

 
 

 

 
 

 

 
   
 
 

Useful links:

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

 

 

 


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