scholarly journals Scaling Law of Stray Fields from SMES Coil Configurations as Functions of Stored Energy and Maximum Magnetic Field.

2002 ◽  
Vol 37 (5) ◽  
pp. 202-207 ◽  
Author(s):  
Takataro HAMAJIMA ◽  
Kimiyasu SATO ◽  
Hiroshi YAMADA ◽  
Naoyuki HARADA ◽  
Makoto TSUDA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Scaling Law ◽  
Stored Energy ◽  
Maximum Magnetic Field

Scaling Law of Fringe Fields as Functions of Stored Energy and Maximum Magnetic Field for SMES Configurations

2004 ◽  
Vol 14 (2) ◽  
pp. 705-708 ◽  
Author(s):  
T. Hamajima ◽  
T. Yagai ◽  
N. Harada ◽  
M. Tsuda ◽  
H. Hayashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Scaling Law ◽  
Stored Energy ◽  
Maximum Magnetic Field ◽  
Fringe Fields

scholarly journals On the pinning force in high density MgB2 samples

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
V. Sandu ◽  
A. M. Ionescu ◽  
G. Aldica ◽  
M. A. Grigoroscuta ◽  
M. Burdusel ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Scaling Law ◽  
Critical Force ◽  
High Density ◽  
Pinning Force ◽  
Pinning Mechanism ◽  
Grain Boundary Pinning ◽  
Peaked Function ◽  
Main Factor

AbstractAn analysis of the field dependence of the pinning force in different, high density sintered samples of MgB2 is presented. The samples were chosen to be representative for pure MgB2, MgB2 with additives, and partially oriented massive samples. In some cases, the curves of pinning force versus magnetic field of the selected samples present peculiar profiles and application of the typical scaling procedures fails. Based on the percolation model, we show that most features of the field dependence of the critical force that generate dissipation comply with the Dew-Hughes scaling law predictions within the grain boundary pinning mechanism if a connecting factor related to the superconducting connection of the grains is used. The field dependence of the connecting function, which is dependent on the superconducting anisotropy, is the main factor that controls the boundary between dissipative and non-dissipative current transport in high magnetic field. Experimental data indicate that the connecting function is also dependent on the particular properties (e.g., the presence of slightly non-stoichiometric phases, defects, homogeneity, and others) of each sample and it has the form of a single or double peaked function in all investigated samples.

scholarly journals Validation of a scaling law for the coronal magnetic field strength and loop length of solar and stellar flares

2016 ◽  
Vol 69 (1) ◽  
pp. 7 ◽  
Author(s):  
Kosuke Namekata ◽  
Takahito Sakaue ◽  
Kyoko Watanabe ◽  
Ayumi Asai ◽  
Kazunari Shibata
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Scaling Law ◽  
Coronal Magnetic Field ◽  
Loop Length ◽  
Stellar Flares

scholarly journals Linear transformer accelerator for the excimer laser

2003 ◽  
Vol 21 (2) ◽  
pp. 219-222 ◽  
Author(s):  
B.M. KOVALCHUK ◽  
E.N. ABDULLIN ◽  
D.M. GRISHIN ◽  
V.P. GUBANOV ◽  
V.B. ZORIN ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Excimer Laser ◽  
Electron Energy ◽  
High Voltage ◽  
Beam Current ◽  
The Self ◽  
High Current ◽  
Stored Energy ◽  
Beam Formation ◽  
Diode Current

A high-current accelerator for pumping of the 200-L excimer laser is developed, providing electron energy of 550 keV, a diode current of 320 kA, and an e-beam current of 250 kA. The high-voltage part of the accelerator consists of two linear transformers with a stored energy of 98 kJ. To reduce the influence of the self-magnetic field on e-beam formation, the vacuum diode is divided into six separate magnetically isolated diodes.

Instability and transition of a vertical ascension or fall of a free sphere affected by a vertical magnetic field

2018 ◽  
Vol 859 ◽  
pp. 33-48 ◽  
Author(s):  
Jun-Hua Pan ◽  
Nian-Mei Zhang ◽  
Ming-Jiu Ni
Keyword(s):  
Magnetic Field ◽  
Interaction Parameter ◽  
Scaling Law ◽  
Density Ratio ◽  
Vertical Magnetic Field ◽  
Streamwise Vorticity ◽  
Close Relationship ◽  
Wake Patterns ◽  
The Magnetic Field ◽  
Solid System

When the Galileo number is below the first bifurcation, the instability and transition of a vertical ascension or the fall of a free sphere affected by a vertical magnetic field are investigated numerically. A compact model is used to explain that the magnetic field can destabilize the fluid–solid system. When the interaction parameter exceeds a critical value, the sphere trajectory is transitioned from a steady vertical trajectory to a steady oblique one. Furthermore, the trajectory will remain vertical at a sufficiently large magnetic field because of a double effect of the magnetic field on the fluid–solid system. Under the influence of an external vertical magnetic field, four wake patterns at the rear of the sphere are found and the physical behaviour of the free sphere is independent of the density ratio. The wake or trajectory of the free sphere is only determined by the Galileo number $G$ and the interaction parameter $N$. A close relationship between the streamwise vorticity and the sphere motion is found. An interesting ‘agglomeration phenomenon’ is also found, which shows that the vertical velocities are agglomerated into a point for a certain magnetic field regardless of the Galileo number and satisfy a scaling law $V_{z}\sim N^{-1/4}$, when $N>1$. The principal results of the present work are summarized in a map of regimes in the $\{G,N\}$ plane.

scholarly journals Masses and Magnetic Fields of White Dwarfs in Cataclysmic Variables

1989 ◽  
Vol 114 ◽  
pp. 337-340
Author(s):  
J.P. Lasota ◽  
J.M. Hameury ◽  
A.R. King
Keyword(s):  
Magnetic Field ◽  
Angular Momentum ◽  
Magnetic Fields ◽  
White Dwarf ◽  
White Dwarfs ◽  
Cataclysmic Variables ◽  
Strong Support ◽  
Drastic Reduction ◽  
Secondary Star ◽  
Maximum Magnetic Field

We show that the existence of the AM Her period spike implies (i) a unique white dwarf mass ≃ 0.6 − 0.7M⊙ for most magnetic CV’s (ii) nova explosions remove exactly the accreted mass from magnetic white dwarfs, and (iii) the maximum magnetic field for most CV’s is ≤ 4 × 107 G. The existence of the spike is very strong support for the idea that the period gap results from a drastic reduction of angular momentum losses when the secondary star becomes fully convective.

scholarly journals Local influence of magnetosheath plasma beta fluctuations on magnetopause reconnection

2010 ◽  
Vol 28 (5) ◽  
pp. 1053-1063 ◽  
Author(s):  
T. V. Laitinen ◽  
Y. V. Khotyaintsev ◽  
M. André ◽  
A. Vaivads ◽  
H. Rème
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Scaling Law ◽  
Local Influence ◽  
Magnetic Fluctuations ◽  
Mirror Mode ◽  
Magnetopause Reconnection

Abstract. We present observations from two subsolar Cluster magnetopause crossings under southward interplanetary magnetic field and strong mirror mode fluctuations in the magnetosheath. In both events the reconnection outflow jets show strong variations on the timescale of one minute. We show that at least some of the recorded variations are truly temporal, not spatial. On the same timescale, mirror mode fluctuations appear as strong magnetic fluctuations in the magnetosheath next to the magnetopause. This suggests that mirror modes can cause the variations either through modulation of continuous reconnection or through triggering of bursty reconnection. Using a theoretical scaling law for asymmetric reconnection we show that modulation of reconnection at a single x-line can explain the observations of the first event. The second event cannot be explained by a single modulated x-line: there the evidence points to patchy and bursty reconnection.

Dynamic Analysis of a Ferromagnetic Colloidal System

1999 ◽  
Vol 13 (14n16) ◽  
pp. 2085-2092 ◽  
Author(s):  
Hisao Morimoto ◽  
Toru Maekawa
Keyword(s):  
Magnetic Field ◽  
Dynamic Analysis ◽  
Brownian Dynamics ◽  
Scaling Law ◽  
Three Dimensional ◽  
Fractal Dimensions ◽  
Point Of View ◽  
Dynamic Scaling ◽  
Colloidal System ◽  
Dimensional System

We studied cluster structures formed in two- and three-dimensional magnetic fluid systems numerically. We developed a Brownian dynamics calculation method in which both the translational and rotational motions of ferromagnetic particles were taken into account. The cluster formations are analysed from the point of view of second order phase transition and the dependence of the cluster size on the temperature and magnetic field is investigated. The fractal dimensions were, respectively, 1.3 and 1.6 for the two- and three-dimensional systems in the absence of a magnetic field. On the other hand, the fractal dimension was very close to 1.0 for both two- and three-dimensional systems when the system was subjected to a magnetic field. The cluster-cluster aggregations are also investigated and the validity of the dynamic scaling law is examined. It has been found that the fractal dimensions obtained by the dynamic analysis coincide with those obtained by the analysis of the cluster structures. The critical exponents were 0.7 and 0.8 in the absence of a magnetic field and in a magnetic field, respectively, in the case of the two-dimensional system, and 1.2 and 0.8 in the case of the three-dimensional system for λ=12 where λ is the ratio of magnetic dipole energy to thermal energy.

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