Long Pulse and High Duty Operation of a W-Band Gyrotron Traveling Wave Tube

Liu, Guo; Jiang, Wei; Yao, Yelei; Wang, Yu; Cao, Yingjian; Wang, Jianxun; Luo, Yong

doi:10.1109/led.2023.3255303

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Third, the OEM could compare the MIG status for different gyro-TWTs in different testing systems. This technology supports the testing of high-performance gyro-TWTs in several frequency bands [18,20,22].…”

Section: Evaluation Of Experimentsmentioning

confidence: 62%

“…At Beijing Vacuum Electronics Research Institute (BVERI), a W-band TE 02 mode gyro-TWT with a triode MIG achieved a peak power of 60 kW, a bandwidth of 8 GHz, and a saturated gain of 32 dB under the 1% duty cycle [16]. At the University of Electronic Science and Technology of China (UESTC), triode and diode MIGs are developed and applied to the gyro-TWTs covering X [17], Ku [18], Ka [19], Q [20], W [21,22], and G bands [23]. A W-band gyro-TWT with a high duty cycle of 40% and a long pulse width of 2 ms, measured a maximum average power of 20.1 kW.…”

Section: Introductionmentioning

confidence: 99%

“…In comparison with existing testing methods, the proposed OEM technique can calculate the beam quality of the gyro-TWT under various operating conditions in real-time. Furthermore, the OEM technique is universally applicable to all dielectric-loaded gyro-TWTs developed by our group and has undergone experimental verification across the X-band to G-band [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Helical Electron Beam Status Online Evaluation for Magnetron Injection Gun

Jiang,

Lu,

Han

et al. 2023

QuBS

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The magnetron injection gun (MIG) is an essential component of the gyrotron traveling wave tube (gyro-TWT). Although the electron beam status influences the performance of the device, it cannot be measured directly in the experiment. An online evaluation module (OEM) for the experiment is developed to calculate the instant beam parameters of MIG. The OEM, by reconstructing the geometry of the MIG and related magnetic field distribution, can obtain the electron beam status under the operating parameters through the online simulation. The beam velocity spread of thermal emission with instant temperature and surface roughness are also considered. The validation is done in a W-band gyro-TWT, and the beam performance is evaluated in the experiment. With a pitch factor of 1.06 electron beam, the velocity spread affected by the electric-magnetic mismatch, thermal emission, and roughness is 1.00%, 0.56%, and 0.43%, respectively. The other beam parameters are also presented in the developed module. The OEM could guide and accelerate the testing process and ensure the safe and stable operation of the device.

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Section: Evaluation Of Experimentsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Helical Electron Beam Status Online Evaluation for Magnetron Injection Gun

Jiang,

Lu,

Han

et al. 2023

QuBS

Self Cite

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“…Gyrotron traveling wave tubes (gyro-TWTs) can generate high power and broadband microwave, making them the candidates for advanced radars, high data rate communication systems, and advanced spectroscopic techniques [1,2]. Recently, more Guo Liu E-mail: liuguo@uestc.edu.cn and more researchers have paid attention to the high average power or continuous wave (CW) performance due to their unique advantages, especially at W-band and above [3][4][5]. But the spurious oscillations caused by convective and absolute instabilities limit their development and applications.…”

Section: Introductionmentioning

confidence: 99%

Performance Degradation Caused by Ionization of the Released Gas Molecules in W-Band Gyrotron Traveling Wave Tube Based on a Simplified Ionization Model

Wang,

Liu,

Jiang

et al. 2024

J Infrared Milli Terahz Waves

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Analysis of the performance degradation for W-band lossy ceramic-loaded gyrotron traveling wave tubes (gyro-TWTs) caused by ionization of the released gas molecules is presented in this paper. The gas is released from the lossy ceramics during high average or continuous wave operation and ionized by colliding with the high-energy gyrating electrons. A potential well will be formed by the diffusion and accumulation of the ionization particles after the collision and then degrade the gyro-TWT performance. This process has been simulated based on a simplified model by introducing an equivalent ionization source combining ions and electrons. With a vacuum of 2.1 × 10 −6 Pa, the theoretically calculated initial energy and equivalent ionization current are 0.01 eV and 0.5 A, respectively. It leads to a deterioration in the output power stability of the gyro-TWT. The performance degradation including spectrum, and field pattern caused by gas ionization is also given and analyzed. One of the primary causes is the quality (pitch factor and velocity spread) degradation of the electron beam. According to the simulation and hot test experiments, the vacuum should be maintained below 2.1 × 10 −6 Pa for stabilizing the amplified operation.

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