用于电子偏磁共振光谱的263GHz移动波管的演示
Pan Pan1, Yuan Zheng2, Ying Li1
1National Key Laboratory of Science and Technology on Vacuum Electronics (NKLST-VE), Beijing Vacuum Electronics Research Institute (BVERI), Beijing 100015, China.
概括
一个新的263 GHz移动波管 (TWT) 已被开发用于电子偏磁共振光谱. 这种高功率的宽带放大器实现了11.9W的输出功率和25.5dB的增益,证明了稳定的运行.
科学领域:
- 特拉赫兹 (THz) 技术的使用.
- 光谱仪器仪表仪器仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表仪表
- 微波工程 微波工程 微波工程
背景情况:
- 电子磁共振 (EPR) 光谱需要高频,高功率的来源.
- 在这些频率上,现有的固态源在功率和带宽方面存在局限性.
- 移动波管 (TWT) 提供了在毫米波和子特拉赫兹频率上产生高功率的潜力.
研究的目的:
- 设计,制造和测试用于EPR光谱应用的263 GHz旅行波管 (TWT).
- 为了优化TWT的高功率,宽带性能和稳定的运行.
- 通过实验验证来验证设计.
主要方法:
- 采用了一个定期永久磁铁聚焦笔束电子光学系统.
- 一个折叠的波导慢波结构与修改的蛇形曲被利用和优化.
- 进行了实验测试,以验证分析并确认放大器稳定性.
主要成果:
- 设计的TWT实现了最大和输出功率11.9W.
- 记录了25.5dB的和增长.
- 尽管固态信号源的局限性,在5.6GHz带宽上测量了10W的输出功率在260-264GHz之间.
结论:
- 开发的263 GHz TWT是用于EPR光谱学的可行的高功率放大器.
- 折叠的波导结构使得在特拉赫兹以下频率的高功率和宽带操作成为可能.
- 实验结果证实了放大器的性能和稳定性.
相关概念视频
Atomic Emission Spectroscopy: Instrumentation
354
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
354
Transmission Electron Microscopy
5.4K
In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
5.4K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
785
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
785
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
201
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
201
NMR Spectrometers: Overview
1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.1K
Atomic Emission Spectroscopy: Lab
152
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
152


