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In this work the feasibility of a 4 MW 170 GHz coaxial-cavity gyrotron for continuous wave operation is demonstrated. For the first time complete physical designs of the major gyrotron components are elaborated. In a first step, one possible new operating mode is determined, followed by the development of detailed physical designs of the major gyrotron components: Diode and triode type electron gun, coaxial cavity, two-beam quasi-optical output coupler and depressed collector.

coaxial --- gyrotron --- cavity --- two beam --- 4 MW

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The increasing demand for powerful, reliable, and efficient gyrotron oscillators for Electron Cyclotron Resonance Heating (ECRH) in fusion plasma experiments requires a close look at the various factors in gyrotrons that determine gyrotron performance. In this frame, the influence of emitter surface roughness, emission inhomogeneity, and secondary electron generation on gyrotron operation is presented, with focus on Low Frequency Oscillations (LFOs) and Electron Beam Halo (EBH) generation.

Strahlsysteme --- Emitter --- Low Frequency Oscillations --- Magnetron Injection Gun --- Gyrotron --- Electron Beam Halo --- Electron Beam HaloGyrotron

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The DEMOnstration fusion power plant (DEMO) will be the first fusion reactor, which is intended to generate net electrical power. For successful operation of DEMO, high-power gyrotrons with operating frequencies up to 240 GHz are required for plasma heating and stabilization. In this work, a systematic feasibility study and tolerance analysis are performed for the conventional-type hollow-cavity DEMO gyrotrons. The various approaches are also suggested to identify its operational limits.

Hollow-cavity --- Hohlleitergyrotron --- Kernfusion --- Frequenz durchstimmbarkeit --- Gyrotron --- DEMO --- Nuclear Fusion --- Frequency Tunability

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The last decade has contributed to the rapid progress in developing high-power microwave sources. This Special Issue aims to bring together information about the most striking theoretical and experimental results, new trends in development, remarkable modern applications, new demands in parameter enhancement, and future goals. Although only a tiny part of the achievements of recent years is included in this Issue, we hope that the presented articles will be useful for experts and students focusing on modern vacuum electronics.

Technology: general issues --- Energy industries & utilities --- velocity ratio --- velocity spread --- low-voltage --- gyrotrons --- MIG --- particle simulation --- space charge effects --- pillbox window --- wide-band --- W-band --- low loss --- mode converter --- 220 GHz --- taper --- terahertz --- traveling-wave tube --- folded waveguide (FWG) --- slow wave system --- high harmonic traveling wave tube --- gyrotron --- quasi-optical cavity --- confocal waveguide --- frequency tuning --- high power --- sub-millimeter wave --- PFN-Marx --- compact --- modular --- trigger source --- gas switch --- mica capacitor --- millimeter waves --- wireless power transmitting --- quasi-optical antenna --- gaussian beam --- Gyrotron --- sub-terahertz --- high-power microwave source --- HPM source --- virtual cathode oscillator --- vircator --- ring reflector --- high-power electromagnetic waves (HPEM) --- semiconductor --- failure threshold time --- microwave hardness --- electromagnetic pulse (EMP) shielding --- broadband --- gyro-TWT --- high-resolution imaging radar --- TE02 mode --- dielectric properties --- low-reflection barrier windows --- broadband window --- microwaves --- terahertz radiation --- velocity ratio --- velocity spread --- low-voltage --- gyrotrons --- MIG --- particle simulation --- space charge effects --- pillbox window --- wide-band --- W-band --- low loss --- mode converter --- 220 GHz --- taper --- terahertz --- traveling-wave tube --- folded waveguide (FWG) --- slow wave system --- high harmonic traveling wave tube --- gyrotron --- quasi-optical cavity --- confocal waveguide --- frequency tuning --- high power --- sub-millimeter wave --- PFN-Marx --- compact --- modular --- trigger source --- gas switch --- mica capacitor --- millimeter waves --- wireless power transmitting --- quasi-optical antenna --- gaussian beam --- Gyrotron --- sub-terahertz --- high-power microwave source --- HPM source --- virtual cathode oscillator --- vircator --- ring reflector --- high-power electromagnetic waves (HPEM) --- semiconductor --- failure threshold time --- microwave hardness --- electromagnetic pulse (EMP) shielding --- broadband --- gyro-TWT --- high-resolution imaging radar --- TE02 mode --- dielectric properties --- low-reflection barrier windows --- broadband window --- microwaves --- terahertz radiation

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• Reference Manager
• EndNote
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The last decade has contributed to the rapid progress in developing high-power microwave sources. This Special Issue aims to bring together information about the most striking theoretical and experimental results, new trends in development, remarkable modern applications, new demands in parameter enhancement, and future goals. Although only a tiny part of the achievements of recent years is included in this Issue, we hope that the presented articles will be useful for experts and students focusing on modern vacuum electronics.

velocity ratio --- velocity spread --- low-voltage --- gyrotrons --- MIG --- particle simulation --- space charge effects --- pillbox window --- wide-band --- W-band --- low loss --- mode converter --- 220 GHz --- taper --- terahertz --- traveling-wave tube --- folded waveguide (FWG) --- slow wave system --- high harmonic traveling wave tube --- gyrotron --- quasi-optical cavity --- confocal waveguide --- frequency tuning --- high power --- sub-millimeter wave --- PFN-Marx --- compact --- modular --- trigger source --- gas switch --- mica capacitor --- millimeter waves --- wireless power transmitting --- quasi-optical antenna --- gaussian beam --- Gyrotron --- sub-terahertz --- high-power microwave source --- HPM source --- virtual cathode oscillator --- vircator --- ring reflector --- high-power electromagnetic waves (HPEM) --- semiconductor --- failure threshold time --- microwave hardness --- electromagnetic pulse (EMP) shielding --- broadband --- gyro-TWT --- high-resolution imaging radar --- TE02 mode --- dielectric properties --- low-reflection barrier windows --- broadband window --- microwaves --- terahertz radiation --- n/a