Magnetically insulated transmission line oscillator oscillated in a modified HEM11 mode

This paper puts forward a novel magnetically insulated transmission line oscillator (MILO) for the first time which takes a modified HEM11 mode as its main interaction mode. The excitation of the oscillation mode is made possible by carefully adjusting the arrangements of each resonant cavity in a two-dimensional (2-D) slow wave structure. The high frequency characteristics are analyzed and a PIC simulation is carried out; the detailed results are discussed to get a better understanding of this new MILO. Employing an electron beam of about 441 kV and 39.7 kA, it finds that the modified HEM11 mode MILO generates a high power microwave output of about 1.47 GW at 1.45 GHz. The power conversion efficiency is about 8.4% and the generated microwave is in a TE11-like circularly polarized mode; its polarization direction is decided by the rotation direction of the SWS.     

尾式酪氨酸锌卟啉的合成及其非线性光学和热力学性质研究

报道了一种新型尾式酪氨酸锌卟啉(p-(L-Tyr)NC₂H₄OTPPZn)的合成及表征，围绕该化合物进行了非线性光学及热力学性质研究。样品在激光作用下，在一定波长范围内显示出了非常强烈的反饱和吸收行为。对该化合物与3对氨基酸甲酯客体的轴向配位热力学性质作了研究，从热力学数据和圆二色光谱探讨了与不同客体配位能力的差异。     

HEM11 mode magnetically insulated transmission line oscillator： Simulation and experiment

A novel magnetically insulated transmission line oscillator （MILO） in which a modified HEM11 mode is taken as its main interaction mode （HEM11 mode MILO） is simulated and experimented in this paper. The excitation of the oscillation mode is made possible by carefully adjusting the arrangement of each resonant cavity in a two-dimensional slow wave structure. The special feature of such a device is that in the slow-wave-structure region, the interaction mode is HEM11 mode which is a TM-like one that could interact with electron beams effectively; and in the coaxial output region, the microwave mode is TE11 mode which has a favourable field density pattern to be directly radiated. Employing an electron beam of about 441 kV and 39.7 kA, the HEM11 mode MILO generates a high power microwave output of about 1.47 GW at 1.45 GHz in particle-in-cell simulation. The power conversion efficiency is about 8.4 % and the generated microwave is in a TEll-like circular polarization mode. In a preliminary experiment investigation, high power microwave is detected from the device with a frequency of 1.46 GHz, an output energy of 43 J 47 J, and a pulse duration of 44 ns-49 ns when the input voltage is 430 kV450 kV, and the diode current is 37 kA-39 kA.     

L波段高阶模抑制型磁绝缘线振荡器研究

根据磁绝缘线振荡器(magnetically insulated transmission line oscillator, MILO)中基模(TM₀₀模)与临近高阶模(HEM₁₁模)高频场分布的区别,采用破坏各腔之间HEM₁₁模π 模谐振条件的方式抑制器件中高阶模产生的方法,提出了高阶模抑制型MILO. 运用三维全电磁粒子模拟软件对高阶模抑制型L波段MILO器件进行模拟研究, 数值模拟结果表面该方法能够抑制器件中HEM₁₁模的产生.在此基础上对器件进行了对比性实验研究, 实验结果表明高阶模抑制型器件能够抑制HEM₁₁模的产生,稳定工作在基模.     

新型手性酪氨酸修饰的锌卟啉对氨基酸酯的分子识别研究

合成并表征了一种L型Boc酪氨酸修饰的自由卟啉(L-BocTyrTAPP)及其锌卟啉配合物Zn(L-BocTyr)TAPP.通过紫外-可见光谱滴定法,研究了手性锌卟啉配合物与四对对映异构的手性氨基酸酯客体在CHCl₃中的分子识别行为.实验结果表明,在分子识别的过程中,缔合常数顺序均为D型略大于L型,且按K(PheOMe)>K(AIaOMe)>K(ValOMe)>K(LeuOMe)的顺序依次减小.同时,利用园二色光谱进一步阐述手性分子识别过程.此外,采用分子力学方法搜索了主客体体系的最低能量构象,从理论上对实验本质进行较深入的探讨.     

新型手性基团修饰的金属卟啉的合成及性质研究

合成了一种手性基团修饰的金属卟啉化合物[5-对(L-亮氨酰氧乙氧基)苯基-10, 15, 20-三苯基卟啉锌]. 通过元素分析、紫外可见光谱、红外光谱、圆二色光谱及核磁共振波谱对该化合物进行了较详细的表征. 同时, 采用分子力学方法搜索了主体的最低能量构象, 从理论上进一步解释实验结果. 利用Z扫描技术测定了该化合物的三阶非线性光学性质.     

手性锌卟啉的非线性光学性质及对咪唑类客体分子识别的构象研究

在纳秒(ns)领域中，利用Z-扫描技术测定了Zn(o-BocTyr)TAPP(主体1)和Zn(p-BocTyr)TAPP(主体2)两种手性锌卟啉的三阶非线性光学性质以及对咪唑类客体的分子识别行为的构象研究. 结果表明，(1) 两种手性锌卟啉都具有反饱和吸收效应和自散焦效应；(2) 由于两种主体中侧链位置的差异，造成两种主体分子极化程度的不同，主体1具有较大的三阶非线性折射率(n2)值；(3) 主体1中侧链苯环与卟啉环之间存在一定的相互作用；(4) 分子识别出现了配位方向的选择性，客体咪唑(Im)与主体1侧链中的苯环能够形成π-π相互作用，选择从有侧链一方配位于主体1，而2-甲基咪唑(2-MeIm)选择从没有侧链一方进攻主体1，但对于主体2，则没有出现配位方向的选择性.     

磁绝缘线振荡器的起振电压与注入电压关系的分析

粒子模拟和实验研究发现磁绝缘线振荡器(MILO)的起振电压会随注入工作电压的增大而增大, 通过进一步的分析与研究, 找到了引起该现象的根本原因, 即随着注入工作电压的增大, 工作电压上升前沿的斜率必然增大, 上升前沿斜率的增大必然引起起振电压的增大, 当斜率无限大时, MILO的起振电压等于工作电压. 因此, 工作电压上升前沿斜率的变化是引起MILO器件起振点变化的根本原因; 当注入电压上升沿的斜率固定不变时, 同一MILO器件的起振点不变, 即对应的起振电压值不变; 当注入电压上升沿的斜率增大时, 同一MILO器件的起振点对应的起振电压值随之增大. 对MILO器件的自磁绝缘临界电流公式进行了部分修正. 关键词： 磁绝缘线振荡器 工作电压 起振电压 工作曲线     

HEM₁₁ mode magnetically insulated transmission line oscillator:Simulation and experiment

A novel magnetically insulated transmission line oscillator(MILO) in which a modified HEM 11 mode is taken as its main interaction mode(HEM 11 mode MILO) is simulated and experimented in this paper.The excitation of the oscillation mode is made possible by carefully adjusting the arrangement of each resonant cavity in a two-dimensional slow wave structure.The special feature of such a device is that in the slow-wave-structure region,the interaction mode is HEM 11 mode which is a TM-like one that could interact with electron beams effectively;and in the coaxial output region,the microwave mode is TE 11 mode which has a favourable field density pattern to be directly radiated.Employing an electron beam of about 441 kV and 39.7 kA,the HEM 11 mode MILO generates a high power microwave output of about 1.47 GW at 1.45 GHz in particle-in-cell simulation.The power conversion efficiency is about 8.4 % and the generated microwave is in a TE 11-like circular polarization mode.In a preliminary experiment investigation,high power microwave is detected from the device with a frequency of 1.46 GHz,an output energy of 43 J-47 J,and a pulse duration of 44 ns-49 ns when the input voltage is 430 kV-450 kV,and the diode current is 37 kA-39 kA.