Plasma density measurements using FM–CW millimeter wave radar techniques

Modified FM–CW radar techniques using swept millimeter–wave oscillators are useful for determining when a particular density has been reached in a plasma. Narrowband measurements on the Princeton Large Torus (PLT) demonstrate the suitability of these techniques for controlling high‐power auxiliary plasma heating systems. Broadband measurements using these same techniques are proposed, by which the density profile could be determined.