Self-Fields in a Planar Orotron

Yu, Jieun; Antonsen, Thomas M.; Nusinovich, Gregory S.

doi:10.1109/tps.2008.923756

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The beam tunnel is especially prone to parasitic gyrotrontype oscillations, since the perpendicular energy of the electrons increases on the way from the emitter ring to the cavity. Azimuthally symmetric high-order TE 0n gyro-backward waves are the most dangerous source of parasitic oscillations, since it is difficult to attenuate them, especially in highelectron-current MW gyrotrons [27,28]. Several improved beam-tunnel damping structures have been developed to avoid unwanted oscillations:…”

Section: Magnetron Injection Gun and Beam Tunnelmentioning

confidence: 99%

High-power gyrotrons for electron cyclotron heating and current drive

Thumm¹,

Денисов²,

Sakamoto³

et al. 2019

Nucl. Fusion

141

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In many tokamak and stellarator experiments around the globe that are investigating energy production via controlled thermonuclear fusion, electron cyclotron heating and current drive (ECH&CD) are used for plasma start-up, heating, non-inductive current drive and MHD stability control. ECH will be the first auxiliary heating method used on ITER. Megawatt-class, continuous wave (CW) gyrotrons are employed as high-power millimeter (mm)-wave sources. The present review reports on the worldwide state-of-the-art of high-power gyrotrons. Their successful development during the past years changed ECH from a minor to a major heating method. After a general introduction of the various functions of ECH&CD in fusion physics, especially for ITER, Section 2 will explain the fast-wave gyrotron interaction principle. Section 3 discusses innovations on the components of modern long-pulse fusion gyrotrons (magnetron injection electron gun (MIG), beam tunnel, cavity, quasi-optical output coupler, synthetic diamond output window, single-stage depressed collector) and auxiliary components (superconducting magnets, gyrotron diagnostics, high-power calorimetric dummy loads). Section 4 deals with present megawatt-class gyrotrons for ITER, W7-X, LHD, EAST, KSTAR and JT-60SA, and also includes tubes for moderate pulse length machines as, ASDEX-U, DIII-D, HL-2A, TCV, QUEST and GAMMA-10. In Section 5 the development of future advanced fusion gyrotrons is discussed. These are tubes with higher frequencies for DEMO, multi-frequency (multi-purpose) gyrotrons, stepwise frequency tunable tubes for plasma stabilization, injection-locked and coaxial-cavity multi-megawatt gyrotrons, as well as sub-THz gyrotrons for collective Thomson scattering (CTS). Efficiency enhancement via multi-stage depressed collectors, fast oscillation recovery methods and reliability, availability, maintainability and inspectability (RAMI) will be discussed at the end of this section.

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Section: Magnetron Injection Gun and Beam Tunnelmentioning

confidence: 99%

High-power gyrotrons for electron cyclotron heating and current drive

Thumm¹,

Денисов²,

Sakamoto³

et al. 2019

Nucl. Fusion

141

View full text Add to dashboard Cite

show abstract

“…In recent years, much attention has been paid to the development of frequency-tunable low-power high-frequency gyrotrons. [1][2][3][4][5][6] Such gyrotrons can be used to study dynamic nuclear polarization, nuclear magnetic resonance, and the hyperfine split of positronium measurements. Here, the tuning scheme is based on the excitation of cavity modes that only differ by their number of axial variations on their field profile, which may lead to continuous tunability.…”

Section: Introductionmentioning

confidence: 99%