Ok... thanks for all your replies... but now I have conflicting 
opinions. One says yay Al and another says boo Al. Can you guys show 
some supporting data so I can make the final decision on which 
material to use. FYI in case you didnt look at our engineering 
diagrams, the Al will only be used for the conducting ring and 
electrode supports. The actual electrode electrodes are .25" tungsten. 
Look at the diagrams and note the materials at the bottom of the 
designs. Thanks, Andrew
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