[Sneap] Duoplasmatron filaments

[Larry Lamm]

Ovidiu,
 We have used tungsten filaments for many years now. Ours is a very 
simple approach, with a single loop of tungsten wire that I bend by 
hand. In the beginning we had a clamp arrangement to clamp the wire to 
the filament legs (ours are nickel legs), but this was never quite good 
enough contact, with thermal expansion, etc. So now we simply spot weld 
the filament directly to the leg.
 It seems to work quite well, but we only run helium in our source, so I 
can't speak about whether one makes more or less beam with the wire than 
with the mesh. Helium is very difficult to make well, and our experience 
with the tungsten has been at leas as good as with the mesh, and a lot 
less trouble.
 I hope this helps,

Larry

Toader, Ovidiu wrote:
>
> Greetings!
>
>  
>
> Does anybody have any experience in moving from a mesh to a tungsten 
> wire filament in a Duoplasmatron source?
>
>  
>
> Thanks,
>
>  
>
> Ovidiu Toader
>
> University of Michigan
>
> ovidiu at umich.edu <mailto:ovidiu at umich.edu>
>
>  
>
>  
>
>  
>
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-- 
Larry Lamm, Research Professor
Nuclear Structure Laboratory,
     Institute for Structure and Nuclear Astrophysics
University of Notre Dame
Lab: 574-631-7716
Office/Voice Mail: 574-631-7792
Fax: 574-631-5952
Email: llamm at nd.edu