I am designing an rf coil/helical resonator that wraps around a quartz tube used to create a plasma from gas flowing through the tube. I am copying an old coil design which has the following parameters: 1.5" diameter, 5.775" height, and 28 turns made from 0.08" diameter silver wire. The signal fed to the coil is 45MHz and 12.5W. The coil I am designing is for the same type of application, but needs to be about 6" diameter and 7" height. My question is how does this change in size affect the frequency, power, number of turns, diameter of wire, and length of the coil? Thanks in advance for the help.
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