scholarly journals A Quantum-Based Microwave Magnetic Field Sensor

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3288 ◽  
Author(s):  
Hao Shi ◽  
Jie Ma ◽  
Xiaofeng Li ◽  
Jie Liu ◽  
Chao Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Free Space ◽  
Longitudinal Distribution ◽  
Clock Transition ◽  
Microwave Magnetic Field ◽  
Field Sensor ◽  
Glass Cell ◽  
Electromagnetic Perturbation ◽  
The Magnetic Field

In this paper, a quantum-based method for measuring the microwave magnetic field in free space is presented by exploring atomic Rabi resonance in the clock transition of 133Cs. A compact cesium glass cell serving as the microwave magnetic field sensing head was used to measure the spatial distribution of microwave radiation from an open-ended waveguide antenna. The measured microwave magnetic field was not restricted by other microwave devices. The longitudinal distribution of the magnetic field was measured. The experimental results measured by the sensor were in agreement with the simulation. In addition, a slightly electromagnetic perturbation caused by the glass cell was investigated through simulation calculations.

scholarly journals Измерение пространственных распределений температуры электронов в облаках полистироловых пеллетов, испаряющихся в плазме гелиотрона LHD

2018 ◽  
Vol 44 (9) ◽  
pp. 41
Author(s):  
И.А. Шаров ◽  
В.Ю. Сергеев ◽  
И.В. Мирошников ◽  
Б.В. Кутеев ◽  
N. Tamura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Local Thermodynamic Equilibrium ◽  
Longitudinal Distribution ◽  
Emission Coefficient ◽  
Pellet Surface ◽  
Local Emission ◽  
Temperature Of Electrons ◽  
First Time ◽  
The Magnetic Field

AbstractTwo methods for measuring the spatial distribution of the temperature of electrons in a cloud near a polystyrene pellet that ablates in LHD heliotron plasma are described. The first method is based on measuring the ratio of the local emission-coefficient values at wavelengths of 486 ± 5 nm (the H _β line) and 630 ± 5 nm (continuum). The second (new) method is based on the measurement of radiation distributions of the H _β line in the direction along the magnetic field. Both the methods use an assumption about the partial local thermodynamic equilibrium in the cloud and show close results. It is shown for the first time that the temperature of cloud electrons increases from 0.8 eV in the immediate vicinity of the pellet surface to 6.0–7.0 eV at a distance of 6–8 mm from the pellet in the direction along the magnetic field, which agrees with the experimentally observed longitudinal distribution of the H _β radiation in the cloud.

Kinematic dynamo problem in a linear velocity field

1984 ◽  
Vol 144 ◽  
pp. 1-11 ◽  
Author(s):  
Ya. B. Zel'Dovich ◽  
A. A. Ruzmaikin ◽  
S. A. Molchanov ◽  
D. D. Sokoloff
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Velocity Field ◽  
Random Matrix ◽  
Magnetic Energy ◽  
Linear Velocity ◽  
Finite Conductivity ◽  
Kinematic Dynamo ◽  
Linear Velocity Field ◽  
The Magnetic Field

A magnetic field is shown to be asymptotically (t → ∞) decaying in a flow of finite conductivity with v = Cr, where C = Cζ(t) is a random matrix. The decay is exponential, and its rate does not depend on the conductivity. However, the magnetic energy increases exponentially owing to growth of the domain occupied by the field. The spatial distribution of the magnetic field is a set of thin ropes and (or) layers.

scholarly journals Magnetic Field Instability of a Plasma in a Beam of Electromagnetic Radiation

1980 ◽  
Vol 35 (4) ◽  
pp. 461-463 ◽  
Author(s):  
O. M. Gradov ◽  
L. Stenflo
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Magnetic Fields ◽  
Field Strength ◽  
Electromagnetic Radiation ◽  
Characteristic Time ◽  
Incident Radiation ◽  
Maximum Value ◽  
Quasi Stationary State ◽  
The Magnetic Field

Abstract A beam of electromagnetic radiation can generate magnetic fields in plasmas. It is shown that those fields grow significantly when the incident radiation is sufficiently strong. We obtain expressions for the characteristic time of the growth of the fields as well as for their spatial distribution and point out a possible mechanism, which can lead to the formation of a quasi-stationary state. The maximum value of the magnetic field strength is estimated

scholarly journals Optical and Radio Surface Photometry of NGC 891

1990 ◽  
Vol 140 ◽  
pp. 223-224
Author(s):  
R.J. Allen ◽  
S. Sukumar ◽  
F.X. Hu ◽  
P. C. Van Der Kruit
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Surface Brightness ◽  
Relativistic Electrons ◽  
Synchrotron Emission ◽  
Surface Photometry ◽  
Star Forming ◽  
Evolved Stars ◽  
Optical Continuum ◽  
The Magnetic Field

A general correlation between the radio and optical continuum surface brightness has been found in the edge-on galaxy NGC 891. This suggests that the relativistic electrons are produced/accelerated in the vicinity of evolved stars or stellar remnants which have a spatial distribution similar to old disk stars. In this picture, the magnetic field required for the synchrotron emission is carried up from the disk to high Z through instabilities and star-forming activity in the plane.

Sensitive element of the magnetic field sensor based on three-layer film system Co/X/Co (X = Dy, Gd)

2014 ◽  
Vol 59 (11) ◽  
pp. 1644-1649 ◽  
Author(s):  
S. I. Vorobiov ◽  
O. V. Shutylieva ◽  
I. M. Pazukha ◽  
A. M. Chornous
Keyword(s):  
Magnetic Field ◽  
Sensitive Element ◽  
Magnetic Field Sensor ◽  
Film System ◽  
Layer Film ◽  
Field Sensor ◽  
The Magnetic Field

scholarly journals Asymptotic Methods in the Nonlinear Mean-field Dynamo

1991 ◽  
Vol 130 ◽  
pp. 135-139
Author(s):  
D.D. Sokoloff ◽  
A. Shukurov ◽  
A.A. Ruzmaikin
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Steady State ◽  
Main Part ◽  
Asymptotic Methods ◽  
Mean Field ◽  
Coriolis Forces ◽  
The Mean ◽  
The Magnetic Field ◽  
Mean Field Dynamo

AbstractWe discuss the methods and results of analysis of nonlinear mean-field dynamo models based on α-quenching in two asymptotic regimes, namely for weakly and highly supercritical excitation. In the former case the spatial distribution of the steady-state magnetic field is close to that given by the neutrally stable eigenfunction of the corresponding kinematic dynamo. In the latter case the magnetic field distribution within the main part of the dynamo volume is presumably determined by the balance between the Lorentz and Coriolis forces while near the boundaries boundary layers arise in which the field adjusts itself to the boundary conditions. The asymptotic behaviour of the highly supercritical αω-dynamos is sensitive to the particular form of dependence of the mean helicity on magnetic field while α2-dynamos are less sensitive to this dependence.

The Magnetic Field Sensor on the Base of Ybacuo Ceramics with Sharp Jump of Magnetic Reply

1996 ◽  
Vol 430 ◽  
Author(s):  
Kh. R. Rostami ◽  
A. A. Sukhanov ◽  
V. V. Mantorov
Keyword(s):  
Magnetic Field ◽  
Field Measurement ◽  
Critical Magnetic Field ◽  
Measurement Methods ◽  
Magnetic Field Sensor ◽  
Magnetic Field Measurement ◽  
Field Sensor ◽  
The Magnetic Field

AbstractThe magnetic field sensor with sensitivity 10−3 Oe and work temperature 77°K is created on the base of YBaCuO ceramics having a sharp jump of the diamagnetic moment in the region of the first Josephson critical magnetic field. The magnetic field measurement methods and the sensor principle are described. Ways to improve the obtained results are indicated.

Effect of Spatial Distribution of Electronic and Ionic Currents on the Magnetic Field Induced by Galvanic Corrosion

2002 ◽  
Vol 149 (3) ◽  
pp. B65 ◽  
Author(s):  
Hitoshi Yashiro ◽  
Masahito Yoshizawa ◽  
Naoaki Kumagai ◽  
Johann H. Hinken
Keyword(s):  
Magnetic Field ◽  
Spatial Distribution ◽  
Galvanic Corrosion ◽  
Ionic Currents ◽  
The Magnetic Field
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