At 01:56 AM 6/6/2013, you wrote:

 >Any reason you don't want to just buy a suitable heater? There are
 >dozens of companies out there.

P.S. Here is a chart of acceptable watt densities for a mica-insulated
band heater from a typical US supplier:

http://www.tempco.com/band/BandHtr_Images/wattsD.jpg

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