High Power Gyrotrons

1994 ◽  
Vol 347 ◽  
Author(s):  
R. J. Temkin ◽  
K. E. Kreischer
Keyword(s):  
High Power ◽  
Plasma Heating ◽  
Industrial Applications ◽  
Continuous Operation ◽  
Materials Processing ◽  
Pulse Operation ◽  
Wide Range ◽  
Magnetically Confined ◽  
The Status ◽  
Long Pulse

ABSTRACTHigh power gyrotrons have been developed for application to plasma heating in the program of magnetically confined nuclear fusion research. Gyrotron power levels of up to 1 MW in long pulse operation (>ls) and up to 200 kW in true continuous operation (CW) have been demonstrated at frequencies in the 8 to 140 GHz range. The status of high power gyrotron development is reviewed. One current goal of the worldwide gyrotron effort is the development of 1 MW,CW gyrotrons at a frequency of about 170 GHz for heating the proposed international tokamak ITER to ignition. Gyrotrons are also now being used in a variety of other applications including materials processing. Improved gyrotrons with features such as wide range tuning could be developed for industrial applications.

Development of a compact ICRF antenna for high-power and long-pulse plasma heating in the KSTAR

2020 ◽  
Vol 154 ◽  
pp. 111496
Author(s):  
Kenji Saito ◽  
Hyunho Wi ◽  
Sonjong Wang ◽  
Haejin Kim ◽  
Kwangho Jang ◽  
...  
Keyword(s):  
High Power ◽  
Plasma Heating ◽  
Pulse Plasma ◽  
Long Pulse

Experimental assessment of the noise characteristics of propellers for commercial drones

2021 ◽  
Vol 263 (2) ◽  
pp. 4418-4425
Author(s):  
Han Wu ◽  
Peng Zhou ◽  
Siyang Zhong ◽  
Xin Zhang ◽  
Kunyu Luo
Keyword(s):  
Low Cost ◽  
Industrial Applications ◽  
Broadband Noise ◽  
Small Scale ◽  
Noise Emission ◽  
Rotor Aerodynamics ◽  
Noise Characteristics ◽  
Wide Range ◽  
Test Platform ◽  
The Status

Multi-copters or drones are engaged in a wide range of industrial applications for their flexibility, safety and low-cost. The noise emission is becoming an issue with the expanding applications, among which the propellers that drive the drones are the major sources of noise. In this work, the noise characteristics of small-scale propellers is experimentally investigated using the advanced rotor aerodynamics and aeroacoustics test platform in an anechoic chamber at the Hong Kong University of Science and Technology (HKUST). The study will focus on the representative off-the-shelf propellers. The rotor noise will be measured by a linear array with 20 microphones, and the aerodynamic forces will be acquired by using the high-accuracy load cells. The dependence of both the tonal and broadband noise radiation with the thrust and rotation speed at various conditions will be tested. The study will enhance our understanding of the noise features of the multi-rotor powered drones, and will provide us with a better understanding of the status of the drone noise impact on the environment.

scholarly journals Mechanical Properties of Hydrogen Free Diamond-Like Carbon Thin Films Deposited by High Power Impulse Magnetron Sputtering with Ne

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 385 ◽  
Author(s):  
Asim Aijaz ◽  
Fabio Ferreira ◽  
Joao Oliveira ◽  
Tomas Kubart
Keyword(s):  
Thin Films ◽  
Wear Rate ◽  
Magnetron Sputtering ◽  
High Power ◽  
Mass Density ◽  
Industrial Applications ◽  
Diamond Like Carbon ◽  
Mechanical And Tribological Properties ◽  
Process Gas ◽  
Wide Range

Hydrogen-free diamond-like carbon (DLC) thin films are attractive for a wide range of industrial applications. One of the challenges related to the use of hard DLC lies in the high intrinsic compressive stresses that limit the film adhesion. Here, we report on the mechanical and tribological properties of DLC films deposited by High Power Impulse Magnetron Sputtering (HiPIMS) with Ne as the process gas. In contrast to standard magnetron sputtering as well as standard Ar-based HiPIMS process, the Ne-HiPIMS lead to dense DLC films with increased mass density (up to 2.65 g/cm3) and a hardness of 23 GPa when deposited on steel with a Cr + CrN adhesion interlayer. Tribological testing by the pin-on-disk method revealed a friction coefficient of 0.22 against steel and a wear rate of 2 × 10−17 m3/Nm. The wear rate is about an order of magnitude lower than that of the films deposited using Ar. The differences in the film properties are attributed to an enhanced C ionization in the Ne-HiPIMS discharge.

Long pulse operation and premature termination of a high‐power discharge‐pumped XeCl laser

1986 ◽  
Vol 59 (3) ◽  
pp. 711-715 ◽  
Author(s):  
M. R. Osborne ◽  
M. H. R. Hutchinson
Keyword(s):  
High Power ◽  
Premature Termination ◽  
Xecl Laser ◽  
Pulse Operation ◽  
Long Pulse

Development of High Power RF Transmission Components for Long Pulse Operation

2003 ◽  
Vol 43 (1T) ◽  
pp. 101-104
Author(s):  
J.S. Yoon ◽  
Y.D. Bae ◽  
B.G. Hong ◽  
J. G. Kwak
Keyword(s):  
High Power ◽  
Pulse Operation ◽  
Rf Transmission ◽  
Long Pulse
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