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Fast Extraction of Electrons from INS Synchrotron for Injection to SOR-RING

A fast extraction system has been developed, which is used for taking out electron beams of 300 MeV from the 1.3 GeV INS synchrotron and injecting them into the SOR-RING, or a 300 MeV electron storage ring used as a dedicated synchrotron radiation source. The system consists of a fast kicker magnet of lumped-circuit type fed by a pulse-forming-network, and a septum magnet. The fast kicker magnet is excited through a spark gap of triggertron type with average time jitter of switching within ±5 ns for 5×105 operations in free flowing dry nitrogen gas. A pulsed magnetic field of 410 G with a risetime of 50 ns and a duration of 80 ns was obtained when the exciting current was 490 A. The extraction efficiency was estimated to be about 60%.