Development of a high‐frequency, second‐harmonic gyrotron tunable up to 636 GHz

1993 ◽  
Vol 5 (5) ◽  
pp. 1377-1379 ◽  
Author(s):  
T. Idehara ◽  
T. Tatsukawa ◽  
I. Ogawa ◽  
Y. Shimizu ◽  
S. Makino ◽  
...  
Keyword(s):  
High Frequency ◽  
Second Harmonic ◽  
Harmonic Gyrotron

A new method of fluxgate signal extraction

2017 ◽  
Vol 2017 (45) ◽  
pp. 83-89
Author(s):  
A.A. Marusenkov ◽  
Keyword(s):  
High Frequency ◽  
Second Harmonic ◽  
Excitation Frequency ◽  
Low Noise ◽  
Measuring System ◽  
Signal Extraction ◽  
Fluxgate Magnetometer ◽  
New Approach ◽  
Average Value ◽  
The Time Domain

Using dedicated high-frequency measuring system the distribution of the Barkhausen jumps intensity along a reversal magnetization cycle was investigated for low noise fluxgate sensors of various core shapes. It is shown that Barkhausen (reversal magnetization) noise intensity is strongly inhomogeneous during an excitation cycle. In the traditional second harmonic fluxgate magnetometers the signals are extracted in the frequency domain, as a result, some average value of reversal magnetization noises is contributed to the output signals. In order to fit better the noise shape and minimize its transfer to the magnetometer output the new approach for demodulating signals of these sensors is proposed. The new demodulating method is based on information extraction in the time domain taking into account the statistical properties of cyclic reversal magnetization noises. This approach yields considerable reduction of the fluxgate magnetometer noise in comparison with demodulation of the signal filtered at the second harmonic of the excitation frequency.

High‐frequency, step tunable, cyclotron harmonic gyrotron

1991 ◽  
Vol 3 (7) ◽  
pp. 1766-1772 ◽  
Author(s):  
Toshitaka Idehara ◽  
Toshiaki Tatsukawa ◽  
Hidehiko Tanabe ◽  
Satoru Matsumoto ◽  
Kohji Kunieda ◽  
...  
Keyword(s):  
High Frequency ◽  
Harmonic Gyrotron ◽  
Cyclotron Harmonic

scholarly journals Achievement of High Power Sub-Terahertz Radiations with a Second Harmonic Gyrotron

2009 ◽  
Vol 4 ◽  
pp. 011-011 ◽  
Author(s):  
Takashi NOTAKE ◽  
Teruo SAITO ◽  
Yoshinori TATEMATSU ◽  
Akihito FUJII ◽  
Shinya OGASAWARA ◽  
...  
Keyword(s):  
High Power ◽  
Second Harmonic ◽  
Harmonic Gyrotron

Simulation of a 0.33-THz Second Harmonic Gyrotron Based on Double Confocal Cavity

2020 ◽  
Author(s):  
Xiaotong Guan ◽  
Wenjie Fu ◽  
Jiayi Zhang ◽  
Dun Lu ◽  
Xiaolei Zheng ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Confocal Cavity ◽  
Harmonic Gyrotron

A 250-Watts, 0.5-THz continuous-wave second-harmonic gyrotron

2021 ◽  
pp. 1-1
Author(s):  
Mikhail Yu. Glyavin ◽  
Andrey N. Kuftin ◽  
Mikhail V. Morozkin ◽  
Mikhail D. Proyavin ◽  
Andrey P. Fokin ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Second Harmonic ◽  
Harmonic Gyrotron

scholarly journals Receptivity of Boundary Layer over a Blunt Wedge due to Freestream Pulse Disturbances at Mach 6

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Jianqiang Shi ◽  
Xiaojun Tang ◽  
Zhenqing Wang ◽  
Mingfang Shi ◽  
Wei Zhao
Keyword(s):  
Boundary Layer ◽  
Fundamental Frequency ◽  
High Frequency ◽  
Pulse Wave ◽  
Second Harmonic ◽  
Acoustic Pulse ◽  
Disturbance Wave ◽  
Acoustic Disturbances ◽  
Disturbance Frequency ◽  
Harmonic Components

Direct numerical simulation (DNS) of a hypersonic compressible flow over a blunt wedge with fast acoustic disturbances in freestream is performed. The receptivity characteristics of boundary layer to freestream pulse acoustic disturbances are numerically investigated at Mach 6, and the frequency effects of freestream pulse wave on boundary layer receptivity are discussed. Results show that there are several main disturbance mode clusters in boundary layer under acoustic pulse wave, and the number of main disturbance clusters decreases along the streamwise. As disturbance wave propagates from upstream to downstream direction, the component of the modes below fundamental frequency decreases, and the component of the modes above second harmonic components increases quickly in general. There are competition and disturbance energy transfer between different boundary layer modes. The nose boundary layer is dominated by the nearby mode of fundamental frequency. The number of the main disturbance mode clusters decreases as the freestream disturbance frequency increases. The frequency range with larger growth narrows along the streamwise. In general, the amplitudes of both fundamental mode and harmonics become larger with the decreasing of freestream disturbance frequency. High frequency freestream disturbance accelerates the decay of disturbance wave in downstream boundary layer.

Optimization Design of Flat-Top Pulsed Magnet for an 800-GHz Second Harmonic Gyrotron

2020 ◽  
Vol 67 (3) ◽  
pp. 1234-1239
Author(s):  
Pengbo Wang ◽  
Xiaofeng Li ◽  
Junkai Liao ◽  
Xin Qi ◽  
Xiaotao Han ◽  
...  
Keyword(s):  
Optimization Design ◽  
Second Harmonic ◽  
Pulsed Magnet ◽  
Harmonic Gyrotron
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