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We report on measurements performed to characterize vacuum‐ultraviolet Čerenkov radiation generated with a gas cell and optical system, installed in a primary beam line of the Stanford Linear Accelerator Center 20‐GeV electron linac. Variation of the helium pressure in the cell resulted in collected radiation which was tuneable from 800 Å through the visible, had a bandwidth of ≂4% at 1000 Å, a photon flux of ≂1012 photons/sec mA of beam current, and a time structure identical to that of the electron beam. Measured radiation properties are compared to calculated predictions to indicate where improvements in the system design and fabrication could be made.