[Sneap] VDG ion source BN canals

[Chris Westerfeldt]

I have to agree with TF Choo.  We used Potentials for our ion source  
refurbishment for years but in the past
few years they supplied BN insulators for the extraction canal and we  
got very poor performance from these bottles.
The bottles would never clean up - always strike on some residual  
gas.  We actually observe the BN glowing in the presence
of the rf and assume that it is contaminating the plasma.  We went  
back to HVEE bottles with the Quartz bushing and
the problems went away - we have been running with the same source  
bottle for a year without problems.
- Chris

On Jun 10, 2009, at 3:00 PM, Lucas Phinney wrote:

>
>
>
> Hello all,
>
> I am looking for a supplier of Boron Nitride that can be machined  
> down for making canals for a Van De Graaff ion source.  I have found  
> a supplier (Saint-Gobain Advanced Ceramics) but they have several  
> different types of Boron Nitride and I am not sure which one I  
> need.  Any guidance would be greatly appreciated.
>
> Cheers,
>
> -- 
> Lucas Phinney
> Ion Beam Modification and Analysis Laboratory
> Department of Physics
> University of North Texas
> (940) 565-3336
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+++++++++++++++
Chris Westerfeldt
Research Scientist
Duke University Physics Dept.
Durham, NC 27708
Tel: (919) 660-2545
Fax: (919)660-2634
cwest at tunl.duke.edu




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