The S-band linac which can produce a picosecond single electron beam, has been operated since 1977. Several improvements of the linac have increased the reproducibility of picosecond single beam operation, the stability of average current of the output beams and the intensity of picosecond single beams. The application of the linac has been also investigated. Emission and absorption spectroscopy systems with a response of sub-nanosecond have been developed.
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