From: heathjohn2@gmail.com   
      
   On Sunday, December 17, 2017 at 8:33:23 AM UTC-5, Doug Goncz wrote:   
   [[Mod. note -- 42 excessively-quoted lines snipped here.  -- jt]]   
   > However, with cubes of silicon carbide steel smelting additive at   
   > thousands of dollars per tonne, that is nearly a dollar per pound,   
   > supplied as cubes made from rolled slag...the opportunity to try an   
   > intermediate susceptor holder of radiolucent alumina, a handful of such   
   > cubes, which are resonant at the 7mm size, and a stainless crucible, in   
   > a modified home microwave...was irresistible.   
   >   
   > So I am doing it.   
   >   
   > Me falta los cubos.   
   >   
   > I will report as I progress.   
   >   
   > Today's activity is trimming the furance lining of glazed white clay   
   > tile in back to back slabs which will receive aerogel spacers later, to   
   > predicting antiresonant sizes, and refitting, and running the oven I   
   > have for ten minutes to see how much they heat up...but first I have to   
   > see how much they heat up in the condition they are in now, which is cut   
   > to fit. I have to start by removing the light bulb in there.   
   >   
   > Cheers,   
   >   
   > Douglas D Goncz   
   > Replikon Research   
      
   I would encourage the building of a small and cheap prototype first   
   before spending the big bucks. Even the best laid plans are subject   
   to Murphy's law. In my experience a resonate thermal barrier will   
   start to get into trouble around 5 to 10 MHz let alone microwave   
   range. A low Q factor can be caused by just 1 m ohm at 100 MHz. As   
   frequency goes up it becomes harder and harder to have high Q   
   resonance therefore the thermal resonance barrier itself will start   
   to heat up.   
      
   An empty resonate cavity could work but that would require many   
   holes drilled that would have to be just the right size to stay in   
   peak resonance.   
      
   There is also heat reflective materials like tin. This would turn   
   a disadvantage into an advantage. Let the oven walls get hot. Then   
   fiberglass followed by tin foil to reflect both heat and microwave   
   energy back into the oven.   
      
   I hope you find some of this useful and again a small and cheap   
   prototype will only take a few days to build before spending the   
   big bucks. looking forward to progress updates.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)