四极电子管可以作为射频四级场(radio frequency quadrupole,RFQ)加速器的射频功率源,而阴极和栅极作为四极电子管的关键电极,其结构参数直接影响四极电子管的输出功率和增益等主要性能参数。利用有限元分析软件ANSYS,对RF频率为195 MHz...四极电子管可以作为射频四级场(radio frequency quadrupole,RFQ)加速器的射频功率源,而阴极和栅极作为四极电子管的关键电极,其结构参数直接影响四极电子管的输出功率和增益等主要性能参数。利用有限元分析软件ANSYS,对RF频率为195 MHz~600 MHz、输出功率为500 kW的四极电子管的栅极等关键部件进行了热分析计算。为模拟工作状态,首先施加阴极组件给定的功率,观测阴极和栅极组件的温度分布情况,然后进行抑制栅极散热翼片的结构优化与设计,仿真结果显示:栅极最高温度从289.29℃下降至268.21℃,达到优化抑制栅极的散热效果,并使用ANSYS的热-结构联合模块对其进行耦合计算分析,验证了优化后栅极结构的可行性,改善了四极管的散热需求,从而保证四极管能在合适的工作温度下稳定运行。展开更多
A fiber laser based on broadband C-band fiber grating (CFG) and high birefringence (HiBi) fiber loop mirror (FLM) is demonstrated, which uses the comb-like reflection performance of the HiBi FLM. Under different polar...A fiber laser based on broadband C-band fiber grating (CFG) and high birefringence (HiBi) fiber loop mirror (FLM) is demonstrated, which uses the comb-like reflection performance of the HiBi FLM. Under different polarization states, different output lasers are gained by choosing the polarization states of the light in the cavity using the polarization controller. By this method, a single wavelength or dual wavelength laser beam can be output, and multi-wavelength oscillates can be achieved.展开更多
面向存在低耗电要求的数字家电SoC(系统芯片),东芝日前试产了栅长10nm的晶体管。在2004年6月15日于美国檀香山开幕的半导体制造技术国际会议"2004 Symposium on VLSI Technology"上进行了技术发表。"目前已经证实晶体管...面向存在低耗电要求的数字家电SoC(系统芯片),东芝日前试产了栅长10nm的晶体管。在2004年6月15日于美国檀香山开幕的半导体制造技术国际会议"2004 Symposium on VLSI Technology"上进行了技术发表。"目前已经证实晶体管能够正常开关,泄漏电流处在大体允许的范围内"(东芝)。设计工艺为22nm,预计2016年前后开始量产。其最大特点是采用了与现有技术相同的Bulk MOS结构晶体管。展开更多
文摘A fiber laser based on broadband C-band fiber grating (CFG) and high birefringence (HiBi) fiber loop mirror (FLM) is demonstrated, which uses the comb-like reflection performance of the HiBi FLM. Under different polarization states, different output lasers are gained by choosing the polarization states of the light in the cavity using the polarization controller. By this method, a single wavelength or dual wavelength laser beam can be output, and multi-wavelength oscillates can be achieved.
