Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron

Cerfon, Antoine; Choi, Eun‐Mi; Marchewka, C.; Mastovsky, I.; Shapiro, Michael A.; Sirigiri, J.R.; Temkin, Richard J.

doi:10.1109/tps.2009.2020903

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…If the wave is not reflected entirely at the input it may cause interaction with electrons that have not yet reached the resonator space and the operation will be disturbed. Unwanted oscillations in the GUN area are especially studied in high power gyrotrons [3]. The literature proposes other kinds of boundary condition for the radiation of the Fourier components of the RF field of Robin's type, which are discussed in [2].…”

Section: Boundary Conditionsmentioning

confidence: 99%

The Gyrotron Startup Scenario in the Single Mode Time Dependent Approach

Nowak

Pliński

Więckowski

et al. 2019

Mathematical Modelling and Analysis

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Section: Boundary Conditionsmentioning

confidence: 99%

The Gyrotron Startup Scenario in the Single Mode Time Dependent Approach

Nowak

Pliński

Więckowski

et al. 2019

Mathematical Modelling and Analysis

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“…They can form a 'halo' around the main electron beam, be issued from the cathode nose, or even be located at the rear of the gun. Such an effect has been invoked to explain parasitical oscillations observed in the 100MHz range in gyrotrons [5], [6].…”

Section: B Voltage Stand-offmentioning

confidence: 99%

Gun design criteria for the refurbishment of the first prototype of the EU 170GHz/2MW/CW coaxial cavity gyrotron for ITER

Pagonakis¹,

Hogge²,

Goodman³

et al. 2009

2009 34th International Conference on Infrared, Millimeter, and Terahertz Waves

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The first prototype of the EU 170 GHz/2 MW/CW coaxial cavity gyrotron for ITER has been tested in the frame of a collaboration between European Research Institutions (EGYC 1 ) supported by Fusion for Energy (F4E). The experiments showed (i) the limitation of the operating parameters range to a low efficiency domain, and (ii) a voltage stand-off problem. The first observation has been associated to a poor beam quality at the cavity. Possible explanations for the second observation are the existence of a potential well located at the rear part of the gun and/or the presence of an electron population trapped in the magnetic mirror between the cathode and the cavity. Both effects were simulated using Ariadne++ [1] and a new gun design is proposed, were they are absent.

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“…Trapped electron mechanisms and emission inhomogeneity are studied at KIT, where experimental results suggest a correlation between gyrotron performance and the presence of trapped electrons [26][27][28]. Massachusetts Institute of Technology (MIT) explored low-frequency oscillation in a 1.5 MW, 110 GHz gyrotron, measuring oscillations in the range of 165-180 MHz with a capacitive probe [29]. At Huazhong University of Science and Technology (HUST), an 800 GHz gyrotron prototype with a sapphire window was developed to examine the correlation between misalignment and beam trajectory.…”

Section: Introductionmentioning

confidence: 99%

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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Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron

Abstract: Abstract-We

Cited by 20 publications

References 14 publications

The Gyrotron Startup Scenario in the Single Mode Time Dependent Approach

The Gyrotron Startup Scenario in the Single Mode Time Dependent Approach

Gun design criteria for the refurbishment of the first prototype of the EU 170GHz/2MW/CW coaxial cavity gyrotron for ITER

Helical Electron Beam Status Online Evaluation for Magnetron Injection Gun

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