The rapid cycling synchrotron （RCS） is part of the China Spallation Neutron Source （CSNS）. The RCS provides 1.6 GeV protons with a repetition rate of 25 Hz. The RF system in RCS is mainly composed of a ferrite loa...The rapid cycling synchrotron （RCS） is part of the China Spallation Neutron Source （CSNS）. The RCS provides 1.6 GeV protons with a repetition rate of 25 Hz. The RF system in RCS is mainly composed of a ferrite loaded RF cavity, a high power tetrode amplifier, a bias supply of 3300 A and a digital low level RF （LLRF） system based on FPGA. The major challenge of the LLRF system is to solve problems caused by rapid frequency sweeping and the heavy beam loading effect. A total of eight control loops are applied to ensure the normal operation. An effective feedforward scheme is widely used to improve the dynamic performance of the system. The design of the LLRF system and high power integration test results with the prototype RF system are presented.展开更多
Background The construction of China Spallation Neutron Source(CSNS)was started in 2011 and will be completed in 2018.The phase I CSNS facility consists of an 80MeV HLinac,a 1.6GeV Proton Rapid Cycling Synchrotron(RCS...Background The construction of China Spallation Neutron Source(CSNS)was started in 2011 and will be completed in 2018.The phase I CSNS facility consists of an 80MeV HLinac,a 1.6GeV Proton Rapid Cycling Synchrotron(RCS),two beam transport lines and a target station.Magnets in the RCS and transport lines should be measured before being installed in the tunnel.Method In this paper,a new hall probe measurement system is described.The design and performance of the hall probe measurement system is presented.Conclusions The measurement results meet the design requirements.Some key issues were solved in the process.展开更多
基金Supported by National Natural Science Foundation of China(11175194)
文摘The rapid cycling synchrotron （RCS） is part of the China Spallation Neutron Source （CSNS）. The RCS provides 1.6 GeV protons with a repetition rate of 25 Hz. The RF system in RCS is mainly composed of a ferrite loaded RF cavity, a high power tetrode amplifier, a bias supply of 3300 A and a digital low level RF （LLRF） system based on FPGA. The major challenge of the LLRF system is to solve problems caused by rapid frequency sweeping and the heavy beam loading effect. A total of eight control loops are applied to ensure the normal operation. An effective feedforward scheme is widely used to improve the dynamic performance of the system. The design of the LLRF system and high power integration test results with the prototype RF system are presented.
文摘Background The construction of China Spallation Neutron Source(CSNS)was started in 2011 and will be completed in 2018.The phase I CSNS facility consists of an 80MeV HLinac,a 1.6GeV Proton Rapid Cycling Synchrotron(RCS),two beam transport lines and a target station.Magnets in the RCS and transport lines should be measured before being installed in the tunnel.Method In this paper,a new hall probe measurement system is described.The design and performance of the hall probe measurement system is presented.Conclusions The measurement results meet the design requirements.Some key issues were solved in the process.
