Active power filters （APFs） are widely used for their outstanding performance in current and voltage rip- ple compensation. As modern high-energy accelerators are demanding much more stringent current ripple guideli...Active power filters （APFs） are widely used for their outstanding performance in current and voltage rip- ple compensation. As modern high-energy accelerators are demanding much more stringent current ripple guidelines, APFs are used in the magnet power supply （MPS） in accelerator systems. However, conventional APFs have many drawbacks due to the traditional topology, such as complex structure, nonadjustable working voltage, requirement of power supply, and so on. This paper proposes a new APF topology, which works as two types of chopper circuits. This APF does not need extra electricity, but uses the power of the MPS current ripple to realize ripple depression. Experimental results prove its feasibility and effectiveness.展开更多
Particles in a storage ring oscillate in the longitudinal and transverse dimensions. Therefore, the signal that beam has generated can be analyzed in the frequency domain to extract many beam parameters, such as tune,...Particles in a storage ring oscillate in the longitudinal and transverse dimensions. Therefore, the signal that beam has generated can be analyzed in the frequency domain to extract many beam parameters, such as tune, momentum spread, emittance and their evolution with time and so on. In this paper, the transverse spectrum in HIRFL-CSR was simulated and analyzed under different conditions, including electron cooling, hollow electron beam, solenoid effect, the tune shift caused by power supply ripple and the misalignment between ion and electron beams. The result of the simulation shows that the longitudinal magnetic field of the electron cooling device should be compensated by a ＂compensation solenoid＂, and the power supply ripple must be controlled, otherwise the accumulation would be affected and the beam would be lost.展开更多
文摘Active power filters （APFs） are widely used for their outstanding performance in current and voltage rip- ple compensation. As modern high-energy accelerators are demanding much more stringent current ripple guidelines, APFs are used in the magnet power supply （MPS） in accelerator systems. However, conventional APFs have many drawbacks due to the traditional topology, such as complex structure, nonadjustable working voltage, requirement of power supply, and so on. This paper proposes a new APF topology, which works as two types of chopper circuits. This APF does not need extra electricity, but uses the power of the MPS current ripple to realize ripple depression. Experimental results prove its feasibility and effectiveness.
基金Supported by National Natural Science Foundation of China (10635090)
文摘Particles in a storage ring oscillate in the longitudinal and transverse dimensions. Therefore, the signal that beam has generated can be analyzed in the frequency domain to extract many beam parameters, such as tune, momentum spread, emittance and their evolution with time and so on. In this paper, the transverse spectrum in HIRFL-CSR was simulated and analyzed under different conditions, including electron cooling, hollow electron beam, solenoid effect, the tune shift caused by power supply ripple and the misalignment between ion and electron beams. The result of the simulation shows that the longitudinal magnetic field of the electron cooling device should be compensated by a ＂compensation solenoid＂, and the power supply ripple must be controlled, otherwise the accumulation would be affected and the beam would be lost.
