THz backward-wave oscillators for plasma diagnostic in nuclear fusion
THz backward-wave oscillators for plasma diagnostic in nuclear fusion
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DOI：
10.1109/plasma.2015.7179508
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
C. Paoloni;Lingna Yue;Xiaopin Tang;Fuzhi Zhang;B. Popovic;Logan Himes;R. Barchfeld;D. Gamzina;R. Letizia;M. Mineo;N. Luhmann
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文献类型：
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作者：
C. Paoloni;Lingna Yue;Xiaopin Tang;Fuzhi Zhang;B. Popovic;Logan Himes;R. Barchfeld;D. Gamzina;R. Letizia;M. Mineo;N. Luhmann
仅提供摘要形式。对核聚变中等离子体湍流的理解与强大的THz源的可用性和绘制更宽等离子体区域的可能性有关。报道了一种用于NSTX实验等离子体诊断的紧凑型THz源的设计方法，设计了两个0.346THz返波振荡器（BWO），目前正在研制中。一种BWO基于双交错光栅（DSG），其支持片状电子束以提供高输出功率;第二种BWO基于双波纹波导（DCW），其支持由常规皮尔斯枪产生的圆柱形电子束。这两个BWO的性能计算的粒子在细胞（PIC）模拟。DSG-BWO提供约1 W的输出功率，束流为10 mA，束流电压为16.8 kV。在束流10 mA、束流电压13 kV的条件下，DCW-BWO输出功率为0.74 W。DSG和DCW已经通过最先进的原型纳米CNC铣床（DMG Mori-Seiki）实现，该铣床允许在成本和表面精加工方面实现任何其他技术都无法实现的性能。这是该技术首次应用于0.3THz以上的结构。这两种BWO的高输出功率表明了新方法在新兴的太赫兹真空电子器件领域的重要性。
Summary form only given. The understanding of plasma turbulence in nuclear fusion is related to the availability of powerful THz sources and the possibility to map wider plasma regions. A novel approach to realize compact THz sources to be implemented in the plasma diagnostic at NSTX experiment (Princeton Plasma Physics Laboratory, USA) is reported.Two novel 0.346 THz Backward-Wave Oscillators (BWOs) have been designed and are presently in the fabrication phase. One BWO is based on the Double Staggered Grating (DSG) that supports a sheet electron beam to provide a high output power; the second BWO is based on the Double Corrugated Waveguide (DCW) that supports a cylindrical electron beam generated by a conventional Pierce gun. The performance of both the BWOs was computed by Particle-in-cells (PIC) simulations. The DSG-BWO provides about 1W of output power with a beam current of 10 mA and a beam voltage of 16.8 kV. The DCW-BWO provides 0.74W output power with 10 mA beam current and 13 kV beam voltage. The DSG and the DCW have been realized by state of the art prototype nano-CNC milling machine (DMG Mori-Seiki) that permits one to achieve performance, in term of cost and surface finishing, unavailable with any other technology. It is the first time that this technique is applied to structures above 0.3 THz. The high output power of both the BWOs demonstrates the importance of novel approaches in the emerging field of THz vacuum electron devices.