R
Robert Barchfeld
Researcher at University of California, Davis
Publications - 26
Citations - 592
Robert Barchfeld is an academic researcher from University of California, Davis. The author has contributed to research in topics: Traveling-wave tube & Backward-wave oscillator. The author has an hindex of 12, co-authored 25 publications receiving 444 citations.
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Journal ArticleDOI
Performance of a Nano-CNC Machined 220-GHz Traveling Wave Tube Amplifier
Anisullah Baig,Diana Gamzina,Takuji Kimura,John Atkinson,Calvin Domier,Branko Popovic,Logan Himes,Robert Barchfeld,Mark Field,Neville C. Luhmann +9 more
TL;DR: In this article, the authors report on hot test measurements of a wide-bandwidth, 220-GHz sheet beam traveling wave tube amplifier developed under the Defense advanced research projects agency (DARPA) HiFIVE program.
Journal ArticleDOI
Nano-CNC Machining of Sub-THz Vacuum Electron Devices
Diana Gamzina,Logan Himes,Robert Barchfeld,Yuan Zheng,Branko Popovic,Claudio Paoloni,EunMi Choi,Neville C. Luhmann +7 more
TL;DR: In this article, the nano-computer numerical control (CNC) machining technology is employed for the fabrication of sub-THz (100-1000 GHz) vacuum electron devices.
Journal ArticleDOI
THz Backward-Wave Oscillators for Plasma Diagnostic in Nuclear Fusion
Claudio Paoloni,Diana Gamzina,Logan Himes,Branko Popovic,Robert Barchfeld,Lingna Yue,Yuan Zheng,Xiaopin Tang,Ye Tang,Pan Pan,Hanyan Li,Rosa Letizia,Mauro Mineo,Jinjun Feng,Neville C. Luhmann +14 more
TL;DR: In this paper, the progress of a joint international effort devoted to the design and realization of novel backward-wave oscillators at 0.346 THz and above with output power in the 1 W range is reported.
Journal ArticleDOI
Nanoscale Surface Roughness Effects on THz Vacuum Electron Device Performance
Diana Gamzina,Hanyan Li,Logan Himes,Robert Barchfeld,Branko Popovic,Pan Pan,Rosa Letizia,Mauro Mineo,Jinjun Feng,Claudio Paoloni,Neville C. Luhmann +10 more
TL;DR: In this article, the surface roughness of metal waveguides has been investigated at the nanoscale using microfabrication techniques, and two significant examples are considered: a 0.346-THz backward wave tube oscillator and an 0.263-thz traveling wave tube.
Proceedings ArticleDOI
THz backward-wave oscillators for plasma diagnostic in nuclear fusion
Claudio Paoloni,Lingna Yue,Xiaopin Tang,Fuzhi Zhang,Branko Popovic,Logan Himes,Robert Barchfeld,Diana Gamzina,Rosa Letizia,Mauro Mineo,Neville C. Luhmann +10 more
TL;DR: In this article, 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.