2008 Vol. 32, No. S1
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Abstract:
A 100MeV compact high intensity H-cyclotron is under design and construction at CIAE which will provide a 75MeV—100MeV, 200μA proton beam. The main magnet of this cyclotron adopts an integrally compact structure with a fixed field and four sectors, while the hill gap is constantly changeable. This paper reviews
the design features of the magnet, numerical simulation results, the inner defects of the magnet including the carbon content segregation and shrinkage porosity, factors related to mechanical design including the tolerance and deformation. The latest progress will also be reported in this paper.
A 100MeV compact high intensity H-cyclotron is under design and construction at CIAE which will provide a 75MeV—100MeV, 200μA proton beam. The main magnet of this cyclotron adopts an integrally compact structure with a fixed field and four sectors, while the hill gap is constantly changeable. This paper reviews
the design features of the magnet, numerical simulation results, the inner defects of the magnet including the carbon content segregation and shrinkage porosity, factors related to mechanical design including the tolerance and deformation. The latest progress will also be reported in this paper.
Abstract:
High time-stability performance of the injection kicker system is important for the Beijing Electron Positron Collider Upgrade Project (BEPCⅡ), with jitter and drift less than ±5ns. In order to compensate the delay time drift of thyratron on the kicker pulsed power supply, a drift stabilizer is developed. The test results meet the demand of design by regulation resolution=1ns, jitter+drift <2ns in 8 hours. The detailed design of the time-drift stabilizer will be described in this paper.
High time-stability performance of the injection kicker system is important for the Beijing Electron Positron Collider Upgrade Project (BEPCⅡ), with jitter and drift less than ±5ns. In order to compensate the delay time drift of thyratron on the kicker pulsed power supply, a drift stabilizer is developed. The test results meet the demand of design by regulation resolution=1ns, jitter+drift <2ns in 8 hours. The detailed design of the time-drift stabilizer will be described in this paper.
Abstract:
The BEPCⅡ is the upgrade project of the Beijing Electron Positron Collider (BEPC). According to the BEPCⅡ double ring design scheme, a new ring will be added in the existing BEPC tunnel. The machine will provide electron and positron beams with an energy range from 1.0GeV to 2.1GeV for high energy physics research, and an electron beam of 2.5GeV, 250mA for synchrotron radiation. So actually there are three storage rings for the BEPCⅡ machine. Due to the limited space of the existing BEPC tunnel and the requirement of high luminosity, the antechamber type vacuum chamber is used, that makes the BEPCⅡ magnets' design and fabrication very difficult. In the paper the general features of the design and fabrication of several kinds of main magnets for the BEPCⅡ storage ring and its interaction region are introduced. And the magnetic field measurement results are presented.
The BEPCⅡ is the upgrade project of the Beijing Electron Positron Collider (BEPC). According to the BEPCⅡ double ring design scheme, a new ring will be added in the existing BEPC tunnel. The machine will provide electron and positron beams with an energy range from 1.0GeV to 2.1GeV for high energy physics research, and an electron beam of 2.5GeV, 250mA for synchrotron radiation. So actually there are three storage rings for the BEPCⅡ machine. Due to the limited space of the existing BEPC tunnel and the requirement of high luminosity, the antechamber type vacuum chamber is used, that makes the BEPCⅡ magnets' design and fabrication very difficult. In the paper the general features of the design and fabrication of several kinds of main magnets for the BEPCⅡ storage ring and its interaction region are introduced. And the magnetic field measurement results are presented.
Abstract:
Finite Element Method is used in this article to analyze the stress of CR superferric magnet. Magnetic force and the stress caused by this force are calculated. The thermal stress and strain of the coil caused by cooling down is also analyzed. The result will be taken as a check for the design of the coil and coilcase, and also as a reference for the optimization of further design and quench protection.
Finite Element Method is used in this article to analyze the stress of CR superferric magnet. Magnetic force and the stress caused by this force are calculated. The thermal stress and strain of the coil caused by cooling down is also analyzed. The result will be taken as a check for the design of the coil and coilcase, and also as a reference for the optimization of further design and quench protection.
Abstract:
The CR superconducting magnet is a dipole of the FAIR project of GSI in Germany. The quench of the strand is simulated using FEM software ANSYS. From the simulation, the quench propagation can be visualized. Programming with APDL, the value of propagation velocity of normal zone is calculated. Also the voltage increasing over time of the strand is computed and pictured. Furthermore, the Minimum Propagation Zone (MPZ) is studied. At last, the relation between the current and the propagation velocity of normal zone,
and the influence of initial temperature on quench propagation are studied.
The CR superconducting magnet is a dipole of the FAIR project of GSI in Germany. The quench of the strand is simulated using FEM software ANSYS. From the simulation, the quench propagation can be visualized. Programming with APDL, the value of propagation velocity of normal zone is calculated. Also the voltage increasing over time of the strand is computed and pictured. Furthermore, the Minimum Propagation Zone (MPZ) is studied. At last, the relation between the current and the propagation velocity of normal zone,
and the influence of initial temperature on quench propagation are studied.
Abstract:
High homogeneity of the CR (collector ring) dipole magnet for FAIR (Facility for Antiproton and Ion Research) project at GSI is essential. The two optimized and analysis methods are introduced in detail. In order to obtain an ideal integral magnetic field distribution, the complicated end chamfer has been designed. By chamfering the removable pole, the distribution tolerance of high magnetic field is optimized to ±2×10－4. The method of adding a mirror plane is suitable for
the high magnetic field and it doesn't fit the low one. The OPERA is used to optimize the dipole magnetic field.
High homogeneity of the CR (collector ring) dipole magnet for FAIR (Facility for Antiproton and Ion Research) project at GSI is essential. The two optimized and analysis methods are introduced in detail. In order to obtain an ideal integral magnetic field distribution, the complicated end chamfer has been designed. By chamfering the removable pole, the distribution tolerance of high magnetic field is optimized to ±2×10－4. The method of adding a mirror plane is suitable for
the high magnetic field and it doesn't fit the low one. The OPERA is used to optimize the dipole magnetic field.
Abstract:
The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator. The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by stripping method. This power supply demands that its output pulse current falling edge be controlled by the program. The power supply uses the IGBT power amplifying method to generate the pulse current and makes it follow the setting waveform by the power supply's feedback control system. The tracking error is one of the important specifications of the power supply. To satisfy the tracking error less than 2%, the frequency of the IGBT topology requested is more than 400kHz. The IGBT topology is connected by the IGBT H bridges in series and parallel, and works in the phase shifted method to divide the current, the voltage and improve the equivalent frequency. High power, high frequency, fast speed response and optimal feedback control strategy are the key to the good performance of painting bumper magnets pulsed power supply.
The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator. The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by stripping method. This power supply demands that its output pulse current falling edge be controlled by the program. The power supply uses the IGBT power amplifying method to generate the pulse current and makes it follow the setting waveform by the power supply's feedback control system. The tracking error is one of the important specifications of the power supply. To satisfy the tracking error less than 2%, the frequency of the IGBT topology requested is more than 400kHz. The IGBT topology is connected by the IGBT H bridges in series and parallel, and works in the phase shifted method to divide the current, the voltage and improve the equivalent frequency. High power, high frequency, fast speed response and optimal feedback control strategy are the key to the good performance of painting bumper magnets pulsed power supply.
Abstract:
A 40kV/6kA pulsed power supply was designed for the Rapid Cycling Synchrotron (RCS) extraction kicker magnet of the China Spallation Neutron Source. The calculation of the pulsed power supply's parameters, the design of power supply's system, the optimization of pulse forming network (PFN) are introduced in this paper. The magnet current pulse waveform is simulated by PSpice program in the situation of 36.5kV charging voltage. The simulation explains the influence of the PFN section number and the transmission cable
length on the magnet current pulse.
A 40kV/6kA pulsed power supply was designed for the Rapid Cycling Synchrotron (RCS) extraction kicker magnet of the China Spallation Neutron Source. The calculation of the pulsed power supply's parameters, the design of power supply's system, the optimization of pulse forming network (PFN) are introduced in this paper. The magnet current pulse waveform is simulated by PSpice program in the situation of 36.5kV charging voltage. The simulation explains the influence of the PFN section number and the transmission cable
length on the magnet current pulse.
2008, 32(S1): 28-30.