一种新的永久周期磁铁聚焦的高功率宽带放大器

提出了一种新的高功率宽带放大器，它由速调管和自由电子脉塞组成，用永久周期磁铁聚焦。研究了这种器件的电子束聚焦、群聚和辐射。在速调管提供一阶调制系数为30%，波导管的半径1.51cm，摇摆器的磁场振幅0.16T，周期7.92cm，电子束的电压490kV，电流50A和半径0.368cm的条件下，预估这种器件的辐射波频率为11.4GHz，输出辐射功率为18MW，输出辐射带宽为44%。     

基于多元智能理论的探究性惯性实验

以中学物理教学中生动活泼的物理探究性实验课堂教学过程为载体，阐述了其间教师应如何采用有效的多元智能教学策略，从多种智力角度培养学生学习物理的兴趣并发展个性．     

高功率激光放大器中的能量传输

片状放大器系统是高功率激光装置最主要的能量和功率来源，它主要解决驱动器的纵向能量传输和转换问题。放大器中能量转换主要通过储能组件、脉冲氙灯、泵浦腔和增益介质等单元部件实现。为了达到最佳的性能和最高的效率，必须使放大器每一个单元部件设计尽量最优，并保持较高的可靠性。影响储能的主要因素见图1。放大器的设计和优化，关联到众多元器件的协同配合，在各单元的设计中必须考虑到对系统的影响和指标分配。放大器的设计需要是在总体设计的框架下，以提高系统的储能效率、增益能力、降低热效应为目标，结合元器件的可靠性水平，进行系统设计。同样，合理均衡的能量转换和传输过程，也是决定放大器稳定可靠、高效运行的前提和保障。     

基于偏振保持掺Er3+光纤的高稳定性单波长光纤激光器

研制出光敏偏振保持掺Er³⁺光纤,通过在这种光纤上紫外写入三个光纤光栅,形成对抽运激光高转化效率的谐振腔.在输出功率为23.617dBm、工作波长为976nm的激光抽运下,得到均值功率为9.20dBm、均值中心波长为1554.554nm的单波长激光输出.在室温下800min（约13.3h）的测量时间内,其输出功率的波动为±0.05dB,中心工作波长的波动为±0.0015nm. 关键词： 光纤激光器 3+光纤')" href="#">偏振保持掺Er³⁺光纤 光纤Bragg光栅     

Conceptual design of Hefei advanced light source

The conceptual of Hefei Advanced Light Source, which is an advanced VUV and Soft X-ray source, was developed at NSRL of USTC. According to the synchrotron radiation user requirements and the trends of SR source development, some accelerator-based schemes were considered and compared; furthermore storage ring with ultra low emittance was adopted as the baseline scheme of HALS. To achieve ultra low emittance, some focusing structures were studied and optimized in the lattice design. Compromising of emittance, onmomentum and off-momentum dynamic aperture and ring scale, five bend acromat (FBA) was employed. In the preliminary design of HALS, the emittance was reduced to sub nm·rad, thus the radiation up to water window has full lateral coherence. The brilliance of undulator radiation covering several eVs to keVs range is higher than that of HLS by several orders. The HALS should be one of the most advanced synchrotron radiation light sources in the world.     

Scanning the energy dissipation process of energetic materials based on excited state relaxation and vibration–vibration coupling

The energy dissipation mechanism of energetic materials(EMs) is very important for keeping safety. We choose nitrobenzene as a model of EM and employ transient absorption(TA) spectroscopy and time-resolved coherent anti-stokes Raman scattering(CARS) to clarify its energy dissipation mechanism. The TA data confirms that the excited nitrobenzene spends about 16 ps finishing the twist intramolecular charge transfer from benzene to nitro group, and dissipates its energy through the rapid vibration relaxation in the initial excited state. And then the dynamics of vibrational modes(VMs) in the ground state of nitrobenzene, which are located at 682 cm~(-1)(v_1), 854 cm~(-1)(v_2), 1006 cm~(-1)(v_3), and 1023 cm~(-1)(v_4),is scanned by CARS. It exhibits that the excess energy of nitrobenzene on the ground state would further dissipate through intramolecular vibrational redistribution based on the vibrational cooling of vi and v_2 modes, v_1 and v_4 modes, and v_3 and v_4 modes. Moreover, the vibration-vibration coupling depends not only on the energy levels of VMs, but also on the spatial position of chemical bonds relative to the VM.     

OPTICAL REALIZATION OF WAVELET TRANSFORM WITH A SINGLE LENS

Two optical set-ups to implement wavelet transform with a single lens have been proposed, in which the wavelet filter was placed in front of the imaging lens or on the frequency plane. The general formula of the complex field distribution of the output plane has been deduced. The analysing wavelet functions of the band-pass wavelet filters with double and circular slits have been discussed.     

合肥储存环二期改造工程的调试

合肥光源二期工程改造后, 对电子储存环光学参数进行了全面的调试和测量, 新注入系统和高频系统的调试, 也获得了巨大的成功, 在插入八极铁和过正地补偿色品后, 耦合束团不稳定性的得到了有效地抑制, 从而使改造后电子储存环能积累和运行在300mA以上的流强.     

瞬态大电流测量结温中校温曲线弯曲现象的研究

利用脉宽250 μs、占空比5%的0–1.5 A脉冲电流, 分别在50, 70, 90, 110, 130 ℃条件下, 对TO-247-2L封装型PIN快恢复二极管大电流下的校温曲线进行了测量分析. 研究发现, 恒定大电流条件下, 二极管的校温曲线随温度变化发生弯曲. 分析表明, 弯曲现象主要是由于串联电阻受迁移率的影响随温度发生变化而引起的. 通过实验测量及理论计算, 得到了准确的非线性校温曲线, 从而减小了瞬态大电流测量结温中的误差.     

基于变形镜的气动光学效应仿真实验研究

基于高速飞行器流场光传输数据和变形镜系统,提出了一种气动光学效应半实物仿真方法。根据流体力学、统计、几何和物理光学等理论,建立远场目标的光学传输模型,获得气动光学效应引起的目标光波的波前畸变数据,控制变形镜系统调制光波来仿真生成畸变。完成了初步验证,建立了一个超音速飞行模型(马赫数Ma=5)并进行了仿真实验,计算了实验的波前仿真误差,并分析了成像偏移和模糊特性。对高速飞行中的气动光学效应进行仿真,在实验室条件下实现对相关成像系统性能和校正技术的测试。