0.22 THz折叠波导行波管输出窗的仿真设计与实验研究
|
摘要
输出窗是微波管内将高频能量由高真空环境传送至外部负载的关键部件。本文研究了用于0.22 THz折叠波导行波管的输出窗结构,采用CST微波工作室进行优化计算,设计出窗片材料为蓝宝石的盒型窗结构。分析了结构参数的变化对盒型窗电压驻波比的影响,当盒型窗结构参数在±0.01 mm范围变化时,其驻波比仍低于1.2,保证了零部件加工的可行性。计算了输出结构的损耗包括壁损耗和介质损耗,结合ANSYS软件分析了输出结构上的温度和热应力分布,分析表明:介质窗片的损耗非常小,输出结构的温升主要是由波导壁损耗导致,输出功率为10 W时,窗片最高温度为88.5℃,窗片上最大应力与窗片中心应力差为47.1 MPa,对窗片的结构影响不大。根据优化参数,制备了盒型窗,并且对该结构进行了测试,结果表明,在频率216 GHz处,驻波比为1.24。
Herein,we reported the design optimization with CST microwave studioof the pill-box output window,comprising rectangular and circular waveguides and sapphire disc,for 0.22 THz folded waveguide traveling wave tube(TWT).The influence ofthe structures,including the sizes of disc and circular waveguide on thewindow's properties,such as the voltage stand wave ratio(VSWR),power dissipation of circular waveguide wall and sapphire disc,profiles of temperature and thermal stress,was investigated by ANSYS simulation.We found that the ±0.01 mm size variations result in a VSWR below 1.2,compatible with the fabrication tolerance.The simulated results show that operating at 10 W,the power mainly absorbed by the wall increased the disc to a highest temperature of 88.5℃ and produced a maximum radial stress difference of 47.1 MPa.The VSWR of the prototyped pill-box window wasmeasured to be 1.24 at 216 GHz.
Herein,we reported the design optimization with CST microwave studioof the pill-box output window,comprising rectangular and circular waveguides and sapphire disc,for 0.22 THz folded waveguide traveling wave tube(TWT).The influence ofthe structures,including the sizes of disc and circular waveguide on thewindow's properties,such as the voltage stand wave ratio(VSWR),power dissipation of circular waveguide wall and sapphire disc,profiles of temperature and thermal stress,was investigated by ANSYS simulation.We found that the ±0.01 mm size variations result in a VSWR below 1.2,compatible with the fabrication tolerance.The simulated results show that operating at 10 W,the power mainly absorbed by the wall increased the disc to a highest temperature of 88.5℃ and produced a maximum radial stress difference of 47.1 MPa.The VSWR of the prototyped pill-box window wasmeasured to be 1.24 at 216 GHz.
引文
[1]吉尔摩,丁耀根,张兆传.速调管、行波管、磁控管、正交场放大器和回旋管[M].北京:国防工业出版社,2012
[2]丁耀根.大功率速调管的理论与计算模拟[M].北京:国防工业出版社,2008
[3]朱方,张兆传,罗积润.S波段盒型输出窗击穿因的电磁分析[J].真空科学与技术学报,2010,30(2):101-105
[4]Michizono S,Saito Y,Yamaguchi S,et al.Dielectric Materials for Use as Output Window in High-Power Klystrons[J].Electrical Insulation IEEE Transactions on,1993,28(4):692-699
[5]Heidinger R,Dammertz G,Meier A,et al.CVD Diamond Windows Studied with Low-and High-Power Millimeter Waves[J].Plasma Science IEEE Transactions on,2002,30(3):800-807
[6]Muehe C E.Thermal Cracking of Waveguide Windows[J].Thermal Cracking of Waveguide Windows,1966
[7]袁广江,卢玉华,罗积润,等.蓝宝石输出窗的成功封接[J].真空科学与技术学报,2004,24(4):299-302
[8]James B G.Diamond Windows for High-Power Broadband Microwave Tubes[A].Cmmunications and Power Industries,1997
[9]王亚军,陈樟,刘俊.0.14 THz折叠波导行波管盒型窗设计与制作[J].太赫兹科学与电子信息学报,2013,11(2):168-170
[10]焦重庆,罗积润.有损金属圆波导中电磁波传输特性的研究[J].物理学报,2006,55(12):6360-636
[2]丁耀根.大功率速调管的理论与计算模拟[M].北京:国防工业出版社,2008
[3]朱方,张兆传,罗积润.S波段盒型输出窗击穿因的电磁分析[J].真空科学与技术学报,2010,30(2):101-105
[4]Michizono S,Saito Y,Yamaguchi S,et al.Dielectric Materials for Use as Output Window in High-Power Klystrons[J].Electrical Insulation IEEE Transactions on,1993,28(4):692-699
[5]Heidinger R,Dammertz G,Meier A,et al.CVD Diamond Windows Studied with Low-and High-Power Millimeter Waves[J].Plasma Science IEEE Transactions on,2002,30(3):800-807
[6]Muehe C E.Thermal Cracking of Waveguide Windows[J].Thermal Cracking of Waveguide Windows,1966
[7]袁广江,卢玉华,罗积润,等.蓝宝石输出窗的成功封接[J].真空科学与技术学报,2004,24(4):299-302
[8]James B G.Diamond Windows for High-Power Broadband Microwave Tubes[A].Cmmunications and Power Industries,1997
[9]王亚军,陈樟,刘俊.0.14 THz折叠波导行波管盒型窗设计与制作[J].太赫兹科学与电子信息学报,2013,11(2):168-170
[10]焦重庆,罗积润.有损金属圆波导中电磁波传输特性的研究[J].物理学报,2006,55(12):6360-636