IMPATT Devices for Generation of Millimeter Waves

Kuno, H.J.

doi:10.1016/b978-0-12-147701-1.50008-7

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…The JET FIR diagnostic [2] (see figure 1), at the end of JET plasma operation on 18 December 2023, operated as a hybrid Mach-Zehnder interferometer/polarimeter with diffraction grating wheels used as beam modulators [3] probing the plasma with four vertical channels and four lateral channels (see figure 2).…”

Section: Latest Diagnostic Capabilitiesmentioning

confidence: 99%

JET far-infrared interferometer/polarimeter diagnostic system—40 years of lessons learned

Boboc,

Macdonald,

Felton

et al. 2024

Plasma Phys. Control. Fusion

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Originally designed for five years of plasma operations, the JET Far Infrared (FIR) interferometer/polarimeter diagnostic system was still operating at its full capabilities nearly forty years later in ITER relevant conditions (eg. metal-wall, tungsten divertor) for multiple D-T campaigns, albeit with significantly lower neutron fluences. The original design had to adapt substantially over the years due to machine changes, leading to reduced signal and access to mirrors etc, and the diagnostic still worked due to the excellent dynamic range of the detectors.This paper will discuss invaluable lessons learned designing, operating, optimising, and enhancing such a complex system and how these can be used for developing the new class of laser-based diagnostics for the next generation reactor grade machines.

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Section: Latest Diagnostic Capabilitiesmentioning

confidence: 99%

JET far-infrared interferometer/polarimeter diagnostic system—40 years of lessons learned

Boboc,

Macdonald,

Felton

et al. 2024

Plasma Phys. Control. Fusion

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“…Examples for the RF performance of individual device structures are given in the subsequent sections. An overview of typical configurations for waveguide circuits (31,32) is shown in Fig. 14.…”

Section: Device Packages Oscillator Circuits and Rf Performancementioning

confidence: 99%

Gunn or Transferred‐Electron Devices

Eisele

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Transferred‐electron devices are the only microwave devices whose operation is solely based on the bulk‐material properties of semiconductors such as GaAs or InP. These devices are mainly employed in low‐noise medium‐power oscillators up to high millimeter‐wave frequencies. James B. Gunn was the first scientist to observe the underlying physical phenomenon in an experiment and, therefore, these devices are often referred to as Gunn devices. This chapter describes the principles of operation, basic fabrication technologies, and common oscillator circuits for them. Different device structures for performance optimization, optimization procedures, and simulation tools are discussed. The chapter also summarizes the current state of the art of Gunn devices and the outlook covers the prospects of more recent device structures and material systems.

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“…At the same time as Nishizawa was developing optical-to-THz generators using laser techniques, he was also pushing his semiconductor oscillators and three terminal devices up in frequency-the fourth goal of his future directions speech [38]. The IMPATT (impact ionization and transit time) diode, which he first described in a report to Nippon Telegraph and Telephone in 1953 [24], and the TUNNETT (tunnel injection transit time) diode, presented in 1958 [26], were both demonstrated to oscillate above 100 GHz by the mid 1970's [100], [25]. The GaAs TUNNETT diode reached the submillimeter in 1979 [101] and hit 650 GHz in 2005 [102] and 700 GHz in 2006 [103].…”

mentioning

confidence: 99%

Terahertz Pioneer: Jun-ichi Nishizawa “THz Shogun”

Siegel

2015

IEEE Trans. THz Sci. Technol.

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IMPATT Devices for Generation of Millimeter Waves

Cited by 12 publications

References 27 publications

JET far-infrared interferometer/polarimeter diagnostic system—40 years of lessons learned

JET far-infrared interferometer/polarimeter diagnostic system—40 years of lessons learned

Gunn or Transferred‐Electron Devices

Terahertz Pioneer: Jun-ichi Nishizawa “THz Shogun”

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