Single-mode operation of a high-power, step-tunable gyrotron

Kreischer, K.E.; Temkin, Richard J.

doi:10.1103/physrevlett.59.547

Cited by 154 publications

(46 citation statements)

References 19 publications

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“…In conventional gyrotrons, for example, competition between transverse modes of highly-overmoded closed resonators is a primary concern in obtaining high efficiency operation 7 . In quasioptical gyrotrons, mode competition between axial modes is Ga. oc --…”

mentioning

confidence: 99%

Direct spectral measurements of a quasi-cw free-electron laser oscillator

Danly¹,

Evangelides²,

Chu³

et al. 1990

Phys. Rev. Lett.

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mentioning

confidence: 99%

Direct spectral measurements of a quasi-cw free-electron laser oscillator

Danly¹,

Evangelides²,

Chu³

et al. 1990

Phys. Rev. Lett.

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“…The cavity was designed to resonate with the TE 1 5 , 2 , 1 mode at 140 GHz. and has also been operated successfully 7 in other modes including the TE 1 6 , 2 , 1 mode at 148 GHz. The control-anode voltage during 80 kV operation was 24.5 -25.0 kV.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Velocity ratio measurements of a gyrotron electron beam

Guss¹,

Grimm²,

Kreischer³

et al. 1991

Journal of Applied Physics

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A 140 GHz high power gyrotron has recently been operated in a 14 T Bitter magnet to characterize emission as a function of magnetic field and beam current. The velocity ratio (or pitch angle) a = (v±.)/(v 1 ) of the beam electrons is a critical parameter for high efficiency gyrotron operation and was measured using a capacitive probe located in the beam tunnel before the cavity. The observed velocity ratio decreased as the beam current increased while the beam voltage and magnetic fields were held fixed. This decrease in a partially explains the reduced gyrotron efficiency observed at high beam currents. The velocity ratio exhibited saturation effects as a function of both the beam current and the control-anode voltage, at low cathode magnetic field values. Particle code results show a decrease in a as a function of beam current that is consistent in magnitude with the observed values. 1

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“…In FEL oscillators [41] and gyrotrons [42], mode competition detcrmines the temporal behavior of the eigenmodes of the cavity and the radiation spectrum. Multimode phenomena also occur in overmoded amplifier systems, where the temporal dependence of the eigenmodes is usually sinusoidal.…”

Section: 1mentioning

confidence: 99%

Proposed research on advanced accelerator concepts

Davidson¹,

Wurtele²

1991

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Single-mode operation of a high-power, step-tunable gyrotron

Cited by 154 publications

References 19 publications

Direct spectral measurements of a quasi-cw free-electron laser oscillator

Direct spectral measurements of a quasi-cw free-electron laser oscillator

Velocity ratio measurements of a gyrotron electron beam

Proposed research on advanced accelerator concepts

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