Journal ArticleDOI
Characteristics and applications of fast-wave gyrodevices
Kevin Felch,B.G. Danly,Howard Roberts Jory,K.E. Kreischer,W. Lawson,Baruch Levush,Richard J. Temkin +6 more
- Vol. 87, Iss: 5, pp 752-781
TLDR
The development of gyro-oscillators for fusion experiments has led to the utilization of the devices in several industrial applications, such as ceramic sintering and metal joining as mentioned in this paper.Abstract:
Gyrodevice oscillators and amplifiers (or gyro-oscillators and gyro-amplifiers) are being utilized in a variety of applications where high power levels are required at millimeter-wave frequencies. Gyro-oscillators, developed primarily for magnetic fusion research applications, have achieved power levels near 1 MW for pulse durations in excess of 1 s at frequencies above 100 GHz. Continued work on these devices should enable them to achieve continuous-wave operation at multimegawatt power levels at frequencies in the 100-GHz to 200-GHz range, thereby meeting the requirements of planned magnetic fusion experiments. The development of gyro-oscillators for fusion experiments has led to the utilization of the devices in several industrial applications, such as ceramic sintering and metal joining. Activities in this area involve adapting the oscillators to the industrial environment where reliability, efficiency, and ease of operation are paramount. Gyro-amplifiers are being developed for applications requiring phase coherence and instantaneous bandwidth, such as in linear accelerators and millimeter-wave radar. Impressive results from X-band to W-band already suggest the promise of these devices. Potential new applications and novel gyrodevice design approaches continue to attract the attention of researchers around the world.read more
Citations
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Journal ArticleDOI
Dynamic nuclear polarization at high magnetic fields
Thorsten Maly,Galia T. Debelouchina,Vikram S. Bajaj,Kan-Nian Hu,Chan-Gyu Joo,Melody L. Mak-Jurkauskas,Jagadishwar R. Sirigiri,Patrick C.A. van der Wel,Judith Herzfeld,Richard J. Temkin,Robert G. Griffin +10 more
TL;DR: This review focuses on recent developments in the field of DNP with a special emphasis on work done at high magnetic fields (> or =5 T), the regime where contemporary NMR experiments are performed.
Journal ArticleDOI
The electron cyclotron maser
TL;DR: The electron cyclotron maser (ECM) as mentioned in this paper is based on a stimulated cyclogron emission process involving energetic electrons in gyrational motion, which constitutes a cornerstone of relativistic electronics.
Journal ArticleDOI
Solid-state dynamic nuclear polarization at 263 GHz: spectrometer design and experimental results.
Melanie Rosay,Leo Tometich,Shane Pawsey,Reto Bader,Robert Schauwecker,M. Blank,Philipp Borchard,Stephen Cauffman,Kevin Felch,Ralph T. Weber,Richard J. Temkin,Robert G. Griffin,Werner E. Maas +12 more
TL;DR: The experimental parameters affecting the DNP efficiency are characterized: the magnetic field dependence, temperature dependence and polarization build-up times, microwave power dependence, sample heating effects, and spinning frequency dependence of the D NP signal enhancement.
Journal ArticleDOI
State-of-the-Art of High-Power Gyro-Devices and Free Electron Masers
TL;DR: A review of the development of high-power gyrotron oscillators for long-pulse or CW operation and pulsed gyrotrons for many applications can be found in this article.
Journal ArticleDOI
Second harmonic operation at 460 GHz and broadband continuous frequency tuning of a gyrotron oscillator
M.K. Hornstein,Vikram S. Bajaj,Robert G. Griffin,K. E. Kreischer,Ivan Mastovsky,Michael A. Shapiro,Jagadishwar R. Sirigiri,Richard J. Temkin +7 more
TL;DR: In this article, the authors report the short-pulse operation of a 460 GHz gyrotron oscillator both at the fundamental (near 230 GHz) and second harmonic (near 460 GHz) of electron cyclotron resonance.
References
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Journal ArticleDOI
MPM—An atmospheric millimeter-wave propagation model
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Journal ArticleDOI
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Journal ArticleDOI
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TL;DR: A review of experiments and theory of electron cyclotron resonance heating (ECRH) and current drive (ECCD) is presented in this article, where the basic linear theory of wave propagation and absorption is given and compared with experimental results from many devices.
Journal Article
The Gyrotron
TL;DR: In this article, the authors described the genealogical tree of the gyrotron, stimulated emission of cyclotron radiation in microwave electronics from magnetron to gyroscope, and arrangement of the Gyroscope.