Gyrotrons for ECH applications

Felch, K.; Huey, H.; Jory, H.

doi:10.1007/bf01057322

Cited by 65 publications

(23 citation statements)

References 14 publications

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“…Single-mode mm-wave gyrotron oscillators capable of high average power, 0.1-1 MW, in long pulse or CW operation, are currently under development in several scientific and industrial laboratories [10,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Table 1 summarizes the performance parameters of modern gyrotrons for ECRH in the frequency range from 28 to 85 GHz and 95 GHz gyrotrons for active denial systems which also could be used for ECRH.…”

Section: State-of-the-art Of Fusion Gyrotronsmentioning

confidence: 98%

“…The possible applications of gyrotrons and other gyro-type fast-wave devices span a wide range of technologies [11,[13][14][15][16][17][18]. The plasma physics community has already taken advantage of recent advances in producing high-power micro-and millimeter (mm) waves in the areas of RF plasma applications for magnetic confinement fusion studies, such as lower hybrid current drive (1)(2)(3)(4)(5)(6)(7)(8), electron cyclotron resonance heating and current drive , plasma production for numerous different processes and plasma diagnostic measurements such as collective Thomson scattering or heat-pulse propagation experiments.…”

mentioning

confidence: 99%

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Recent Developments on High-Power Gyrotrons—Introduction to This Special Issue

Thumm

2010

J Infrared Milli Terahz Waves

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Gyrotrons with output powers of several 100 kW are mainly used as high-power millimeter (mm)-wave sources for electron cyclotron resonance heating (ECRH), electron cyclotron current drive (ECCD), stability control and diagnostics of magnetically confined plasmas for generation of energy by controlled thermonuclear fusion. Other applications include ECR ion sources, materials processing and plasma chemistry, high-resolution Doppler radar, radar ranging and imaging in atmospheric and planetary science, active denial systems, as well as detection of concealed radioactive materials. The present review summarizes the status of recent developments on high-power gyrotrons and introduces this Special Issue on Gyrotrons.

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Section: State-of-the-art Of Fusion Gyrotronsmentioning

confidence: 98%

mentioning

confidence: 99%

Recent Developments on High-Power Gyrotrons—Introduction to This Special Issue

Thumm

2010

J Infrared Milli Terahz Waves

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“…The gyrotron tube was manufactured by Varian (now CPI, Inc.) and is rated for maximum, pulsed operations of 200 kW, 75 ms with a TE 02 dominant output mode [4,5]. TE 02 -to-HE 11 mode conversion was previously accomplished with an oversized, mode-converting waveguide system.…”

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confidence: 99%

Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment

Radder

Likin

Anderson

et al. 2008

Int J Infrared Milli Waves

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The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE 02 gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE 11 +TM 11 ), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations.The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.

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“…High-power, millimeter-wave gyrotron oscillators and amplifiers are presently used for numerous applications, which include plasma heating [1] and radars [2]. Normally, gyrotron oscillators operate in a single mode.…”

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confidence: 99%

Mode Switching in a Gyrotron with Azimuthally Corrugated Resonator

2007

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The operation of a gyrotron having a cylindrical resonator with an azimuthally corrugated wall is analyzed. In such a device, wall corrugation cancels the degeneracy of the modes with azimuthally standing patterns. The coupling between these modes depends on the radius of electron beam. It is shown that such a gyrotron can be easily switched from one mode to another. When the switching is done with the repetition frequency equal to the rotational frequency of magnetic islands, this sort of operation can be used for suppression of neoclassical tearing modes in large-scale tokamaks and stellarators.

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Gyrotrons for ECH applications

Cited by 65 publications

References 14 publications

Recent Developments on High-Power Gyrotrons—Introduction to This Special Issue

Recent Developments on High-Power Gyrotrons—Introduction to This Special Issue

Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment

Mode Switching in a Gyrotron with Azimuthally Corrugated Resonator

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