Cusp source is one of the essential elements in high density cyclotron,whose properties have a great impact on the extracted beam of the cyclotron.The article introduces the design and machining of the H-cusp source a...Cusp source is one of the essential elements in high density cyclotron,whose properties have a great impact on the extracted beam of the cyclotron.The article introduces the design and machining of the H-cusp source applied to the high intensity proton beam cyclotron.By investigating deeply the technology of high intensity plasma production, long life DC filament emission of electrons,magnetic confinement,electron filtering,residual gas and electron extraction control,we designed a new cusp source with an average beam density of 15—20mA based on the 10mA H-cusp source at CIAE.展开更多
Modeling has become phenomenal in developing new products.In the case of filters,one of the mos applied procedures is via the construction of idealized physical computational models bearing close semblance to real fil...Modeling has become phenomenal in developing new products.In the case of filters,one of the mos applied procedures is via the construction of idealized physical computational models bearing close semblance to real filter media.It is upon these that multi-physics tools were applied to analvze the fow of fuid and the resulting typical performance parameters.In this work,two 3D filter membranes were constructed with MATLAB:one had a random distribution of unimodal nanofibers,and the other,a novel modification,formed.a bimodal distribution:both of them had similar dimensions and solid volume fractions.A comparison of their performance in a dust-loading environment was made by using computational fluid dynamic-discrete elemen method(CED-DEM)coupling technique in STAR-CCM+.It was found that the bimodal nanofiber membrane greatly improved the particle capture efficiencv.Whereas this increased the pressure drop,the gain was not toosignificant.Thus.overall,the results of the figure of merit ptoved that adopting a bimodal formation improved the filter's quality.展开更多
文摘Cusp source is one of the essential elements in high density cyclotron,whose properties have a great impact on the extracted beam of the cyclotron.The article introduces the design and machining of the H-cusp source applied to the high intensity proton beam cyclotron.By investigating deeply the technology of high intensity plasma production, long life DC filament emission of electrons,magnetic confinement,electron filtering,residual gas and electron extraction control,we designed a new cusp source with an average beam density of 15—20mA based on the 10mA H-cusp source at CIAE.
基金the Chang Jiang Youth Scholars Program of China(No.51773037)the National Natural Science Foundation of China(Nos.51803023 and 61771123)+2 种基金the Shanghai Sailing Program(No.18YF1400400)the China Postdoctoral Science Foundation(No.2018M640317)the Fundamental Hesearch Funds for the Central Universities(No.2232018A3-11)。
文摘Modeling has become phenomenal in developing new products.In the case of filters,one of the mos applied procedures is via the construction of idealized physical computational models bearing close semblance to real filter media.It is upon these that multi-physics tools were applied to analvze the fow of fuid and the resulting typical performance parameters.In this work,two 3D filter membranes were constructed with MATLAB:one had a random distribution of unimodal nanofibers,and the other,a novel modification,formed.a bimodal distribution:both of them had similar dimensions and solid volume fractions.A comparison of their performance in a dust-loading environment was made by using computational fluid dynamic-discrete elemen method(CED-DEM)coupling technique in STAR-CCM+.It was found that the bimodal nanofiber membrane greatly improved the particle capture efficiencv.Whereas this increased the pressure drop,the gain was not toosignificant.Thus.overall,the results of the figure of merit ptoved that adopting a bimodal formation improved the filter's quality.
