SYNCHROTRON ULTRAVIOLET-RADIATION FACILITY (SURF-II) RADIOMETRIC INSTRUMENTATION CALIBRATION FACILITY

Spectrometer calibrations have been performed at the National Institut e of Standards and Technology (formerly the National Bureau of Standar ds) for over 10 yr using the calculable synchrotron radiation from the SURF II electron storage ring. SURF II is now a high-performance stor age ring that can operate at electron energies up to 300 MeV and with over 250 mA of stored current. One beam line, operationally supported by the National Aeronautics and Space Administration (NASA), is dedica ted for use as a radiometric instrumentation calibration facility for outside users.