Ultrashort‐pulse reflectometry (invited)

Time‐of‐flight radar diagnostics are envisaged as having great potential for determining electron density profiles in next generation tokamaks such as TPX and ITER. Ultrashort‐pulse radar reflectometry is a promising new time‐of‐flight diagnostic capable of making instantaneous density profile determination utilizing a single source and a single set of measurements. A proof‐of‐principle eight channel system has been constructed for use on the CCT tokamak at UCLA, and has undergone extensive testing in the laboratory.