The feasibility of attaining nanosecond pulse length heavy ion beam is studied in the main ring (CSRm) of the Heavy Ion Research Facility in Lanzhou. Such heavy ion beam can be produced by non-adiabatic compression, and it is implemented by a fast rotation in the longitudinal phase space. In this paper, the possible beam parameters during longitudinal bunch compression are studied with the envelope model and Particle in Cell simulation, and the results are compared. The result shows that the short bunch ^(238)U^(28+) with the pulse duration of about 50 ns at the energy of 200 MeV/u can be obtained which can satisfy the research of high density plasma physics experiment.
The feasibility of attaining a short-pulse-duration heavy ion beam with a nanosecond pulse lengthis studied in the main ring of the Heavy Ion Research Facility in Lanzhou (HIRFL). Such a heavy ion beamcan be produced by non-adiabatic compression, and it is implemented by fast rotation in the longitudinalphase space. In this paper, the possible beam parameters during longitudinal bunch compression are studiedby using the envelope model. The result shows that a shortest heavy ion bunch 238U28+ of 29 ns with energyof 200 MeV/u can be obtained, which can satisfy high energy density physics research.
The Heavy Ion Research Facility and Cooling Storage Ring (HIRFL-CSR) accelerator in Lanzhou offers a unique possibility for the generation of high density and short pulse heavy ion beams by non-adiabatic bunch compression longitudinally, which is implemented by a fast jump of the RF-voltage amplitude. For this purpose, an RF cavity with high electric field gradient loaded with Magnetic Alloy cores has been developed. The results show that the resonant frequency range of the single-gap RF cavity is from 1.13 MHz to 1.42 MHz, and a maximum RF voltage of 40 kV with a total length of 100 cm can be obtained, which can be used to compress heavy ion beams of 238 U 72+ with 250 MeV/u from the initial bunch length of 200 ns to 50 ns with the coaction of the two single-gap RF cavity mentioned above.
