[Sneap] VDG ion source BN canals

[Jim Stark]

Hi
 Used BN many times never performed as well as quartz canals. Have purchased quartz from Potentials and HVEC but they are getting expensive, many times I have reclaimed quartz by cleaning in a dilute solution of hf and rinsing with de-ionized water. They then should be inspected for cracks and chips, as this will cause extreme difficulties in getting good output. I used to dry them in a vac. oven.
 Also if machining BN make sure the hole has a smooth bore,I always check the canals but had difficulty once with rough BN tip, inspect  with magnification as  output difficulties will be even more severe if swirls exist 
 
 Good Luck but BN is a last resort for us.
 
  ----- Original Message ----- 
  From: Lucas Phinney 
  To: SNEAP 
  Sent: Wednesday, June 10, 2009 3:00 PM
  Subject: [Sneap] VDG ion source BN canals








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  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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