Cascade Atoms in a Bichromatic Standing Wave: A Magnetic-Field-Free Rectified Force Trap

1996 ◽  
pp. 393-394
Author(s):  
H. Pu ◽  
T. Cai ◽  
N. P. Bigelow ◽  
T. T. Grove ◽  
P. L. Gould
Keyword(s):  
Magnetic Field ◽  
Standing Wave

Open Localization in Micro LeadFrame Package Using Space Domain Reflectometry

2013 ◽  
Author(s):  
J. Gaudestad ◽  
V. Talanov ◽  
A. Orozco ◽  
M. Marchetti
Keyword(s):  
Magnetic Field ◽  
Radio Frequency ◽  
Standing Wave ◽  
High Resistance ◽  
Space Domain ◽  
The Past ◽  
Open Defects ◽  
Rf Electronics ◽  
Rf Signal ◽  
The Magnetic Field

Abstract In the past couple years, Space Domain Reflectometry (SDR) has become a mainstream method to locate open defects among the major semiconductor manufacturers. SDR injects a radio frequency (RF) signal into the open trace creating a standing wave with a node at the open location. The magnetic field generated by the standing wave is imaged with a SQUID sensor using RF electronics. In this paper, we show that SDR can be used to non-destructively locate high resistance failures in Micro LeadFrame Packages (MLP).

scholarly journals Обнаружение высокочастотных альфвеновских колебаний в омических разрядах сферического токамака Глобус-М2

2021 ◽  
Vol 47 (12) ◽  
pp. 17
Author(s):  
И.М. Балаченков ◽  
Ю.В. Петров ◽  
В.К. Гусев ◽  
Н.Н. Бахарев ◽  
В.И. Варфоломеев ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Standing Wave ◽  
High Frequency ◽  
Low Density ◽  
Frequency Range ◽  
High Frequency Oscillations ◽  
Model Predictions ◽  
Mode Excitation ◽  
Order Of Magnitude ◽  
Frequency Chirping

In Globus-M2 ohmic discharges with low density, by means of Mirnov coils array, magnetic field oscillations with frequencies in 1 MHz range were detected. Frequency range of these oscillations significantly exceed the range of TAE and RSAE frequencies, which were previously observed on Globus-M and Globus-M2 tokamaks, and their amplitude, contrary, turned out to be up to an order of magnitude lower. It was found that high frequency oscillations are interrelated with suprathermal electron fraction. At the same time the observed instability seems to have Alfvenic nature, since its frequency correlates well with Alfven frequency scaling. It was also found that magnetic perturbation always forms standing wave with predominantly low toroidal wavenumbers, including n = 0 structure, which makes gap (e.g. TAE) mode excitation impossible. Frequency chirping during single bursts with δω ~ √t is consistent with hole-clump model predictions.

scholarly journals Research of the Fundamental Wave of Wound-Rotor Brushless Doubly-Fed Machine

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1172
Author(s):  
Zhenming Li ◽  
Xuefan Wang ◽  
Lezhi Ou ◽  
Xinmai Gao ◽  
Fei Xiong
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Standing Wave ◽  
Electromotive Force ◽  
Fundamental Wave ◽  
Stator Windings ◽  
Doubly Fed ◽  
Rotor Winding ◽  
Doubly Fed Machine ◽  
The Magnetic Field

The brushless doubly-fed machine (BDFM) is a special type of machine with two sets of stator windings and one set of rotor winding. The magnetic field of the BDFM is considered to be complex with no regularity. To study the principles of magnetic fields for the BDFM, a general expression of the fundamental wave is deduced, which shows that the fundamental wave can be regarded as a standing wave when it is observed from rotor reference; also, some discussions about the characteristics of the fundamental wave are presented in the paper. Next, a model of wound-rotor BDFM prototype is established, and the enveloping line and the relations between rotor position and its electrical angle of the magnetic field are figured out in the paper. Finally, after detecting the induced electromotive force (EMF) of measurement coils embedded in the corresponding prototype machine, the validity of the proposed conclusions is verified.

Liquid Metal Free Surface Motion Submerged in an AC Magnetic Field

2007 ◽  
Vol 561-565 ◽  
pp. 1071-1074
Author(s):  
Kazuhiko Iwai ◽  
Shigeo Asai
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Liquid Metal ◽  
Standing Wave ◽  
Skin Layer ◽  
Alternating Magnetic Field ◽  
Liquid Gallium ◽  
Field Frequency ◽  
Surface Motion ◽  
The Magnetic Field

Free surface motion of a liquid metal submerged in an alternating magnetic field has been examined. A copper vessel filled with a liquid gallium is set in a coil for the imposition of the alternating magnetic field. The alternating magnetic field penetrates into a liquid gallium only from an upper free surface because thickness of the copper vessel is larger than the electromagnetic skin layer of copper. Time variation of displacement of the standing wave loop excited on the free surface is detected by a laser level sensor. The standing wave was suppressed not only by intensification of the magnetic field magnitude but also increase of the magnetic field frequency.

scholarly journals Semi-classical limit for Schrödinger equations with magnetic field and Hartree-type nonlinearities

2010 ◽  
Vol 140 (5) ◽  
pp. 973-1009 ◽  
Author(s):  
Silvia Cingolani ◽  
Simone Secchi ◽  
Marco Squassina
Keyword(s):  
Magnetic Field ◽  
Standing Wave ◽  
Electric Potential ◽  
Classical Limit ◽  
Schrodinger Equation ◽  
Schrödinger Equations ◽  
Wave Solutions ◽  
Non Local ◽  
Magnetic Potentials ◽  
Minimum Points

AbstractThe semi-classical regime of standing wave solutions of a Schrödinger equation in the presence of non-constant electric and magnetic potentials is studied in the case of non-local nonlinearities of Hartree type. It is shown that there exists a family of solutions having multiple concentration regions which are located around the minimum points of the electric potential.

Stability of parametrically excited drift waves

1971 ◽  
Vol 5 (3) ◽  
pp. 357-363 ◽  
Author(s):  
John G. Siambis
Keyword(s):  
Magnetic Field ◽  
Standing Wave ◽  
Perturbation Technique ◽  
Standing Waves ◽  
The Other ◽  
Drift Waves ◽  
The Real ◽  
Real Frequency ◽  
Field Lines ◽  
The Magnetic Field

The propagation and stability of drift waves is examined, by means of a perturbation technique, in geometries where the magnitude of the magnetic field varies periodically along the field lines. Two sets of modes are found which can be driven unstable by resonant particles trapped in the magnetic field non-uniformity. One set of modes consists of standing waves with wavelength twice that of the magnetic field non-uniformity. The other set of modes consists of standing waves composed essentially of the sum of a component which does not vary along the line and a component which is a standing wave with wavelength equal to the wavelength of the magnetic field non-uniformity. The advantage of this method is that it predicts simply and pictorially the real frequency of oscillation for these modes.

scholarly journals Effect of standing wave on the uniformity of a low magnetic field helicon plasma

2017 ◽  
Vol 66 (4) ◽  
pp. 045201
Author(s):  
Niu Chen ◽  
Liu Zhong-Wei ◽  
Yang Li-Zhen ◽  
Chen Qiang
Keyword(s):  
Magnetic Field ◽  
Standing Wave ◽  
Helicon Plasma ◽  
Low Magnetic Field
Sign in / Sign up

Export Citation Format

Share Document