Search Results - "Barchfeld, Robert"

Nano-CNC Machining of Sub-THz Vacuum Electron Devices by Gamzina, Diana, Himes, Logan G., Barchfeld, Robert, Yuan Zheng, Popovic, Branko K., Paoloni, Claudio, EunMi Choi, Luhmann, Neville C.

“…Nano-computer numerical control (CNC) machining technology is employed for the fabrication of sub-THz (100-1000 GHz) vacuum electron devices. Submicron feature…”
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Performance of a Nano-CNC Machined 220-GHz Traveling Wave Tube Amplifier by Baig, Anisullah, Gamzina, Diana, Kimura, Takuji, Atkinson, John, Domier, Calvin, Popovic, Branko, Himes, Logan, Barchfeld, Robert, Field, Mark, Luhmann, Neville C.

“…We report on hot test measurements of a wide-bandwidth, 220-GHz sheet beam traveling wave tube amplifier developed under the Defense advanced research projects…”
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Fabrication of a 0.346-THz BWO for Plasma Diagnostics by Feng, Jinjun, Tang, Ye, Gamzina, Diana, Li, Xiang, Popovic, Branko, Gonzalez, Michelle, Himes, Logan, Barchfeld, Robert, Li, Hanyan, Pan, Pan, Letizia, Rosa, Paoloni, Claudio, Luhmann, Neville C.

“…Nuclear fusion energy is perhaps one of the most demanding challenges that the scientific community is facing. Unfortunately, the plasma is affected by…”
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THz Backward-Wave Oscillators for Plasma Diagnostic in Nuclear Fusion by Paoloni, Claudio, Gamzina, Diana, Himes, Logan, Popovic, Branko, Barchfeld, Robert, Lingna Yue, Yuan Zheng, Xiaopin Tang, Ye Tang, Pan Pan, Hanyan Li, Letizia, Rosa, Mineo, Mauro, Jinjun Feng, Luhmann, Neville C.

“…Understanding of the anomalous transport attributed to short-scale length microturbulence through collective scattering diagnostics is key to the development…”
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Nanoscale Surface Roughness Effects on THz Vacuum Electron Device Performance by Gamzina, Diana, Hanyan Li, Himes, Logan, Barchfeld, Robert, Popovic, Branko, Pan Pan, Letizia, Rosa, Mineo, Mauro, Jinjun Feng, Paoloni, Claudio, Luhmann, Neville C.

“…Vacuum electron devices are the most promising solution for the generation of watt-level power at millimeter wave and terahertz frequencies. However, the…”
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Experimental study of multichromatic terahertz wave propagation through planar micro-channels by Shin, Young-Min, Baig, Anisullah, Barchfeld, Robert, Gamzina, Diana, Barnett, Larry R., Luhmann, Neville C.

“…Previous theoretical and numerical studies [Y. M. Shin and L. R. Barnett, Appl. Phys. Lett. 92 , 091501 (2008) and Y. M. Shin , Appl. Phys. Lett. 93 , 221504…”
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Development of Laser Based Plasma Diagnostics for Fusion Research on NSTX-U by Barchfeld, Robert Adam

“…Worldwide demand for power, and in particular electricity, is growing. Increasing population, expanding dependence on electrical devices, as well as the…”
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Millimeter wave band TWTA compatible with nano-CNC fabrication by Baig, Anisullah, Gamzina, Diana, Barchfeld, Robert, Barnett, Larry R., Luhmann, Neville C.

“…Summary form only given. Airborne advanced communication systems seek high power amplifiers (~ 50 W) in the atmospheric window around ~ 233 GHz with a…”
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THz backward-wave oscillators for plasma diagnostic in nuclear fusion by Paoloni, Claudio, Lingna Yue, Xiaopin Tang, Zhang, Fuzhi, Popovic, Branko, Himes, Logan, Barchfeld, Robert, Gamzina, Diana, Letizia, Rosa, Mineo, Mauro, Luhmann, Neville C.

“…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…”
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Development of nano machining techniques to bridge the terahertz gap by Himes, Logan, Gamzina, Diana, Popovic, Branko, Barchfeld, Robert, Luhmann, N. C.

“…Research conducted in parallel with the construction of various vacuum electronic devices, including a 220 GHz Sheet Beam Traveling Wave Tube (SBTWT), a 263…”
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A 75-110GHz micro machined high-Q tunable filter by Do, James T., Barchfeld, Robert, Luhmann, Neville C., Liu, Xiaoguang

“…A 75-110GHz (W band) high-Q tunable band pass filter is demonstrated. The band pass filter has low insertion loss, a Q of approximately 200 and can be tuned…”
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Fabrication of the 0.346 THz BWO for plasma diagnostic by Feng, Jinjun, Tang, Ye, Gamzina, Diana, Li, Xiang, Huang, Xuejiao, Popovic, Branko, Himes, Logan, Barchfeld, Robert, Li, Hanyan, Pan, Pan, Letizia, Rosa, Paoloni, Claudio, Luhmann, Neville C.

“…Nuclear fusion is probably the most demanding challenge the scientific community is facing. The plasma is a delicate material that has to be properly shaped to…”
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Effect of fabrication tolerance on 0.346 THz double corrugated waveguide for backward wave oscillators by Li, Xiang, Gamzina, Diana, Letizia, Rosa, Gonzales, Michelle, Tang, Ye, Zheng, Yuan, Popovic, Branko, Himes, Logan, Barchfeld, Robert, Li, Hanyan, Pan, Pan, Feng, Jinjun, Paoloni, Claudio, Luhmann, Neville C.

“…The fabrication of slow wave structures for THz vacuum electronic devices presents substantial technology challenges and requires tight tolerances as the…”
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High energy beam THz backward wave oscillator based on double corrugated waveguide by Jun Zhang, Li Li, Pan Pan, Ye Tang, Zhang, Fuhzi, Paoloni, Claudio, Letizia, Rosa, Luhmann, Neville C., Popovic, Branko, Himes, Logan, Barchfeld, Robert, Gamzina, Diana, Jinjun Feng

“…A new approach to realize THz BWOs relaxing the assembly challenge is presented. An international consortium including UC Davis, Beijing Vacuum Electronics…”
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346 GHz BWO for fusion plasma diagnostics by Popovic, Branko, Barchfeld, Robert, Xiaopin Tang, Fuzhi Zhang, Yue, Lingna, Mineo, Mauro, Letizia, Rosa, Paoloni, Claudio, Gamzina, Diana, Himes, Logan, Domier, Calvin, Luhmann, Neville

“…Two backward wave oscillator (BWO) designs are proposed for a 346 GHz source for fusion plasma diagnostics applicable for the MAST and NSTX-U devices. Both…”
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Double corrugated waveguide 0.346 THz BWO with wide beam channel by Li, Xiang, Waring, Rob, Zhang, Jun, Pan, Pan, Feng, Jinjun, Luhmann, Neville C., Paoloni, Claudio, Gamzina, Diana, Popovic, Branko, Himes, Logan, Barchfeld, Robert, Letizia, Rosa, Tang, Ye, Li, Hanyan

“…An international consortium including the University of California, Davis (UC Davis), Beijing Vacuum Electronics Research Institute (BVERI), and Lancaster…”
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Nano CNC milling technology for terahertz vacuum electronic devices by Gamzina, Diana, Barchfeld, Robert, Barnett, Larry R., Luhmann, Neville C., Shin, Young-Min

“…To satisfy the growing interest in high power (~1-200 W) THz sources, our research group has been working on various technologies to miniaturize vacuum…”
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Nanoscale surface roughness effects on THz vacuum electron device performance by Luhmann, Neville C., Ye Tang, Mengchao Gao, Pan Pan, Popovic, Branko, Himes, Logan, Barchfeld, Robert, Gamzina, Diana, Paoloni, Claudio, Letizia, Rosa, Mineo, Mauro, Jinjun Feng

“…Vacuum electron devices are the most promising solution to generate power at Watt level at millimeter waves and terahertz frequencies. The three dimensional…”
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220 GHz ultra wide band TWTA: Nano CNC fabrication and RF testing by Baig, Anisullah, Gamzina, Diana, Barchfeld, Robert, Jinfeng Zhao, Domier, Ivin, Spear, Alexander, Barnett, Larry R., Luhmann, Neville C.

“…Precision fabrication and RF testing of a 220 GHz GHz sheet beam TWTA based on the double vane half-period staggered slow wave structure design[1]is reported…”
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Nano CNC milling of two different designs of 0.22 THz TWT circuits by Barchfeld, Robert, Gamzina, Diana, Baig, Anisullah, Barnett, Larry R., Luhmann, Neville C.

“…To satisfy the growing interest in high power (∼1-200 W) THz sources, our research group has been working on various technologies to miniaturize vacuum…”
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