Al2 O3 hollow microspheres without noticeable aggregation have been prepared via a facile templating route with urea-mediated precipitation. The precipitation process is different from the surfaceadsorption method whi...Al2 O3 hollow microspheres without noticeable aggregation have been prepared via a facile templating route with urea-mediated precipitation. The precipitation process is different from the surfaceadsorption method which is confined to the adsorption capacity of the template surface. TEM and SEM images indicate that most of these Al2 O3 hollow microspheres with shell thickness of tens of nanometers and diameters in a narrow range of 100-200 nm consist of a shell of closely packed nanoparticles. The optimal amount of H2 O and EtOH are 40 and 120 m L, respectively. The specific surface area, average pore size and pore volume of the Al2 O3 hollow microspheres（calcinated at 600 ℃） are 328.52 m2/g, 17.496 nm and 1.985 cm3/g, respectively. As the calcination temperature increases from 600 to 1 100 ℃, the phase composition changes from γ-Al2 O3 to θ-Al2 O3 and a-Al2 O3, and the surface morphology appears to change from a relatively rough surface formed by nanoparticles to a smooth surface formed by lamellar, which lead to the closure of pore channels and the reduction of specific surface.展开更多
The super ferric superconducting dipoles are in development for the High Intensity high Energy FRagment Separator(HFRS)of the Heavy-ion Accelerator Facility(HIAF).The dipole magnets of the separator will have a deflec...The super ferric superconducting dipoles are in development for the High Intensity high Energy FRagment Separator(HFRS)of the Heavy-ion Accelerator Facility(HIAF).The dipole magnets of the separator will have a deflection radius of 15.7 m,a field up to 1.6 T with a 320 mm wide good field region and an effective length of 2.74 m.In the HIAF-HFRS,there will be a total of 11 super ferric dipoles.The dipole consists of two superconducting coils,a coil box,a cryostat,and a warm iron warm laminated iron,as shown in Fig.1.The superconducting coils are protected by the active quench protection.展开更多
The High Energy Fragment Separator(HFRS)within the Heavy-ion Accelerator Facility(HIAF)features a beamline comprised of 11 sets of superconducting dipoles and 39 sets of combined multipoles,spanning a length of approx...The High Energy Fragment Separator(HFRS)within the Heavy-ion Accelerator Facility(HIAF)features a beamline comprised of 11 sets of superconducting dipoles and 39 sets of combined multipoles,spanning a length of approximately 180 m.The dipoles are constructed using warm iron superferric technology.Meanwhile,the combined multipoles feature a coil dominated DCT(Discrete Cosine-Theta)coil structure,offering a large aperture,high polar field,compact design,and robust operation.展开更多
文摘Al2 O3 hollow microspheres without noticeable aggregation have been prepared via a facile templating route with urea-mediated precipitation. The precipitation process is different from the surfaceadsorption method which is confined to the adsorption capacity of the template surface. TEM and SEM images indicate that most of these Al2 O3 hollow microspheres with shell thickness of tens of nanometers and diameters in a narrow range of 100-200 nm consist of a shell of closely packed nanoparticles. The optimal amount of H2 O and EtOH are 40 and 120 m L, respectively. The specific surface area, average pore size and pore volume of the Al2 O3 hollow microspheres（calcinated at 600 ℃） are 328.52 m2/g, 17.496 nm and 1.985 cm3/g, respectively. As the calcination temperature increases from 600 to 1 100 ℃, the phase composition changes from γ-Al2 O3 to θ-Al2 O3 and a-Al2 O3, and the surface morphology appears to change from a relatively rough surface formed by nanoparticles to a smooth surface formed by lamellar, which lead to the closure of pore channels and the reduction of specific surface.
文摘The super ferric superconducting dipoles are in development for the High Intensity high Energy FRagment Separator(HFRS)of the Heavy-ion Accelerator Facility(HIAF).The dipole magnets of the separator will have a deflection radius of 15.7 m,a field up to 1.6 T with a 320 mm wide good field region and an effective length of 2.74 m.In the HIAF-HFRS,there will be a total of 11 super ferric dipoles.The dipole consists of two superconducting coils,a coil box,a cryostat,and a warm iron warm laminated iron,as shown in Fig.1.The superconducting coils are protected by the active quench protection.
文摘The High Energy Fragment Separator(HFRS)within the Heavy-ion Accelerator Facility(HIAF)features a beamline comprised of 11 sets of superconducting dipoles and 39 sets of combined multipoles,spanning a length of approximately 180 m.The dipoles are constructed using warm iron superferric technology.Meanwhile,the combined multipoles feature a coil dominated DCT(Discrete Cosine-Theta)coil structure,offering a large aperture,high polar field,compact design,and robust operation.
