Evaluation of shimmed DECY-13 MeV Cyclotron Magnet Using H- Beam Tracking Simulation

2020 ◽  
Vol 1 (2) ◽  
pp. 19-23
Author(s):  
Idrus Abdul Kudus, Mirza Satriawan
Keyword(s):  
Magnetic Field ◽  
Measured Data ◽  
Free Software ◽  
Design Data ◽  
Final Energy ◽  
Beam Tracking ◽  
H Beam ◽  
Magnetic Poles ◽  
The Magnetic Field ◽  
Magnet Axis

Abstract –Using OPERA3DTM, the magnet poles’ shimming that provide an isochronous magnetic field in DECY-13 cyclotron was designed and calculated. The shimmed magnet poles as designed were placed in the magnet and the distribution of the magnetic field in the magnet axis direction (Bz) was measured in radial ( x and y) directions using 2 probes covering x=0 to 480 mm for one probe and 481 to 960 mm  for the other, and y=0 to 960 mm, all were done at z=0 in 9 hours of scanning at 5 mm steps. This paper describes the interpolation and extrapolation to obtain data for magnetic field components (Bx, By,Bz) at 1 mm resolution and at z≠0 as required for beam tracking simulations. The tracking results are used to evaluate the distribution of the shimmed magnetic fields of DECY-13. The program for the interpolation and extrapolation was written and run using a free software Scilab 5.4.1, and tested against OPERA3DTM design data. The beam can reach final energy of 13 MeV when both data was applying in the beam tracking simulation.. However when the measured data was used, the final energy of the beam  reached only 3 MeV, meaning that at the place where that energy was reached the magnetic field is no longer is of isochronous and the shimming of the magnetic poles’ must be improved or redesigned to reach the final beam energy of 13 MeV.Key words: isochronous, DECY-13 cyclotron, Scilab 5.4.1, interpolation and extrapolation, beam tracking simulation

scholarly journals Numerical Simulation on the Brake Effect of FAC-EMBr and EMBrRuler in the Continuous Casting Mold

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1620
Author(s):  
Zhuang Li ◽  
Lintao Zhang ◽  
Yanming Bao ◽  
Danzhu Ma
Keyword(s):  
Magnetic Field ◽  
Molten Steel ◽  
Casting Speed ◽  
Submerged Entry Nozzle ◽  
Pole Position ◽  
Level Fluctuation ◽  
Steel Flow ◽  
Magnetic Poles ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

The brake effect of the freestanding adjustable combination electromagnetic brake (FAC-EMBr) and EMBr ruler on the behavior of molten steel flow and the level fluctuation were investigated with the numerical method. The effects of the horizontal magnetic pole position (EMBr ruler), magnetic induction intensity, and casting speed on two types of electromagnetic brakes were studied. The numerical simulation results show that the magnetic field caused by the EMBr ruler is mainly distributed under the submerged entry nozzle (SEN), and it is very weak nearby the meniscus area. After the FAC-EMBr is applied, the magnetic field is mainly distributed in the area below the submerged entry nozzle, the upper roll region, and in the meniscus region. The application of the electromagnetic brake can effectively suppress the impact of the jet and decrease the molten steel velocity in the meniscus area. The brake effect of the EMBr ruler on the behavior of the molten steel flow and the level fluctuation is significantly influenced by the horizontal magnetic pole position. The increasing of the magnetic flux density can significantly increase the velocity of molten steel in the upper roll region and lead to an intense fluctuation in the steel/slag interface, as the horizontal magnetic field cannot cover the three key regions. The brake effect of the FAC-EMBr is less influenced by the variation of the process parameters due to the addition of vertical magnetic poles. Additionally, the “secondary braking effect” of the vertical magnetic poles can help to lower the increase of velocity in the upper roll region caused by the excessive magnetic induction intensity and the high casting speed. Therefore, even under the high casting speed conditions, the application of a new type of FAC-EMBr is also an efficient way to suppress the molten steel flow and level fluctuation at the meniscus area and decrease the possibility of slag entrapment.

An Experimental Analysis of Vibration Induced Behaviour in Magnetorheological Fluids

2017 ◽  
Author(s):  
Paul-Alexis Novikoff ◽  
Laurent Eck ◽  
Moustapha Hafez
Keyword(s):  
Magnetic Field ◽  
Rotation Axis ◽  
Cylinder Surface ◽  
Stress Variation ◽  
Particle Chain ◽  
Free Air ◽  
Magneto Rheological ◽  
Magnetic Poles ◽  
The Magnetic Field ◽  
Viscosity Dependence

Magneto-rheological fluids (MRF) are commonly applied in MRF brakes and vibration damping. The apparent viscosity dependence with respect to the magnetic field has been addressed in detail in the state of the art. The aim of this paper is to experimentally study the vibration effects on the particle chain-like structures and, as a consequence, the shear stress variation applied to the fluid. Three vibration configurations have been applied to a ferromagnetic cylinder rotating between two magnetic poles filled with MRF a “Z-vibration” where the generated displacement is along the rotation axis of the shearing cylinder, a “θ-vibration”, tangential to the cylinder, and an “R-vibration”, normal to the cylinder surface. First we focus on the vibration mode characterisation in free air, and then when plunged in the fluid. In a second step, we measure the reactive torque generated on the clutch under different magnetic field intensities with different rotation speeds and vibration amplitudes. It appears that the “R-vibration” configuration is providing the most influence, up to 20% of torque reduction observed at moderate B field. The “Z-vibration” and the “θ-vibration” configurations respectively have less influence on the torque, nevertheless vibrations always tend to decrease the corresponding yield stress in the MRF.

Finite Element Analysis of Radial Bearing Magnetic Field

2010 ◽  
Vol 37-38 ◽  
pp. 486-490
Author(s):  
Guo Qing Wu ◽  
Wei Nan Zhu ◽  
Jing Ling Zhou
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Controller Design ◽  
Magnetic Coupling ◽  
System Structure ◽  
Element Analysis ◽  
Radial Bearing ◽  
And Performance ◽  
Magnetic Poles ◽  
The Magnetic Field

There is a magnetic field inside of the radial bearing. The magnetic field distribution is one of the key factors that decides the running state and performance of the system. By using the finite element ANSYS software, the magnetic field of radial bearing was analyzed. The analysis indicated that NSSN mode is suiTable for magnetic radial bearing and NSNS mode unsuiTable. There is a magnetic coupling between magnetic poles. There is magnetic leakage for radial bearing, which leaks towards spindle center through rotor and to coil, but it is very little, less than 5%. The research provides a theoretical basis for optimization of system structure and controller design.

New scheme for computing the magnetic field resulting from a uniformly magnetized arbitrary polyhedron

Geophysics ◽  
1999 ◽  
Vol 64 (1) ◽  
pp. 70-74 ◽  
Author(s):  
D. Guptasarma ◽  
B. Singh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Arbitrary Shape ◽  
Numerical Evaluation ◽  
Solid Angle ◽  
New Approach ◽  
Polygonal Surface ◽  
Magnetic Poles ◽  
The Magnetic Field

The magnetic field at any point outside a uniformly magnetized polyhedron of arbitrary shape is obtained by adding the fields resulting from the effective free magnetic poles on each of the polygonal surfaces of the polyhedron. For each polygonal surface, the components of the field at the point of observation are expressed in terms of new line integrals around the edges of the polygon and the solid angle subtended by the polygon at the point of observation. The line integrals are standard elementary forms. This new approach makes the numerical evaluation of the magnetic fields for such models much simpler and faster than previously published methods.

scholarly journals The Electrical Magnetism of Maxwell (1873) Is the “Crooked Mirror” of Physical Science

2019 ◽  
Vol 11 (3) ◽  
pp. 49
Author(s):  
Robert A. Sizov
Keyword(s):  
Magnetic Field ◽  
Physical Science ◽  
Dimensional Space ◽  
Big Bang ◽  
Nuclear Forces ◽  
Ultimate Truth ◽  
Great Physicist ◽  
Dimensional Space Time ◽  
Magnetic Poles ◽  
The Magnetic Field

The concept of the electric magnetism Maxwell (1873) is a result of the superficial and exceptionally erroneous impression of Great Physicist from the well-known experience of Oersted. However the world scientific community adopted this erroneous impression as the ultimate truth and, following Maxwell, declared the moving electric charges to be direct sources of the magnetic field. At same time, the true sources of the magnetic field the magnetic poles (magnetic charges) which are the real structural components of atoms and substance, were “buried alive”. Such theoretical discoveries as the curvature of four-dimensional space-time, explaining the physics of gravity, the big bang, the journey through “Black holes” in space and time, and many others, are well known. All these discoveries were formed without taking into account the existence of real magnetic poles (magnetic charges) since were based on the provisions of Maxwell’s flawed electromagnetic concept. The main reason which for more than 100 years inhibits the detection and recognition of real magnetic charges, are the special conditions of their confinement in a substance that are radically in the substance different from confinement of electrons. The results the experiments of F. Ehrenhaft, the present author and others in which of real magnetic charges were observed in the structures of atoms and substance prove that the existing concept of electric magnetism is deeply erroneous, and the fundamental change in physical priorities is the most important task today. Physical science, freed from vicious EM-concept of Maxwell and the accompanying relativism will offer humanity innovations in the form of practically useful physical effects and manifestations. This article presents 11 such innovations discovered by the author when embedded into the representations of real magnetic charges including, example, the electromagnetic (vortex) nature of the gravitational field, as well as the effects of Gravitational levitation and Intra-atomic gravitational shielding (IAGS). The first effect allows, for example, a person to go out into space without the use of jet thrust. The IAGS effect largely determines the physics of such fundamental manifestations as the chemical bonding, nuclear forces, and radioactivity.

scholarly journals Roald Amundsen's Arctic research role in the development of Geophysics: the case of the 1903-1906 expedition

2020 ◽  
Vol 84 ◽  
pp. 01001
Author(s):  
Valeriy Kramskiy ◽  
Ekaterina Samylovskaya ◽  
Stefano Maria Capilupi
Keyword(s):  
Magnetic Field ◽  
Arctic Region ◽  
The Arctic ◽  
Earth Structure ◽  
Northwest Passage ◽  
The Earth ◽  
Magnetic Poles ◽  
Further Development ◽  
The Magnetic Field ◽  
The Arctic Region

The paper discusses Roald Amundsen’s discoveries in the sphere of knowledge about the Earth’s magnetic field, made during the Arctic expedition of 1903-1906. A historical overview of previous discoveries made by scientists in the process of studying Geomagnetism is given. The research is based on the study and analysis of R. Amundsen’s memoirs about the expedition. The authors consistently consider the stages of the expedition along the Northwest passage in 1903-1906 and its results. The significance of the geomagnetic characteristics obtained in this expedition is shown. Attention is paid to the phenomenon of magnetic poles drift, and the process of its discovery is described in detail. Amundsen’s discovery of magnetic drift gave an invaluable impetus for further Geomagnetism development, which is also briefly considered. Observations made by Roald Amundsen helped to take a new look at the existing scientific picture of the world, to challenge the traditional model of the Earth structure and to construct a new and, in many ways, revolutionary scheme. As a result of the research, the authors of the paper come to the conclusion that the expedition of 1903-1906 is one of the greatest scientific breakthroughs of that time, also in the sphere of Geophysics. Scientists processed the recorded characteristics of the magnetic field in the Arctic until the 30s of the 20th century. This huge flow of data allowed to supplement the existing maps with magnetic declination and inclination readings in the studied area, and thus to simplify further development of the Arctic region.

Nonlinear Magnetostrictive Effect of Magnetorheological Elastomers

2013 ◽  
Vol 833 ◽  
pp. 291-294 ◽  
Author(s):  
Shu Lei Sun ◽  
Xiong Qi Peng ◽  
Zao Yang Guo
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Finite Element ◽  
Volume Fraction ◽  
Nonlinear Function ◽  
Measured Data ◽  
Magnetorheological Elastomers ◽  
Smart Composites ◽  
Element Simulation ◽  
The Magnetic Field

Magnetorheological elastomers (MREs) are a class of smart composites whose mechanical properties can be obviously changed under different magnetic field. Only a few works study its magnetostrictive property, which describes the changes in dimensions of a material in its magnetization. Magnetostriction in the ferromagnetic particle is also called eigenstrain in MREs. It is modeled using the nonlinear function of the magnetization in this article. The eigenstrain due to the magnetostriction is incorporated in the structure of the MREs using a generalized Hookes Law. By means of initial strain, a finite element simulation is presented to describe the magnetostriction of MREs. The results show that the magnetostriction along the magnetic field depends on the magnetization and the volume fraction of particles. As an application, we will present numerical simulations for a magnetostriction and compare these results with measured data.

New magnetic algorithm to detect community structure based on the magnets’ approach

2019 ◽  
Vol 33 (13) ◽  
pp. 1950166
Author(s):  
Mohamed Amine Midoun ◽  
Xingyuan Wang
Keyword(s):  
Magnetic Field ◽  
Community Structure ◽  
Magnetic Force ◽  
Community Structures ◽  
Mobile Nodes ◽  
The Law ◽  
Magnetic Poles ◽  
Organizational Principles ◽  
Acting Force ◽  
The Magnetic Field

This research paper investigates areas of identifying the community structures which can help us to uncover organizational principles in complex networks. So far, a large number of algorithms have been introduced to discover the community structures, but the majority of these algorithms are suitable just for the unweighted networks. We present a new hierarchical method that identifies communities in weighted and unweighted networks based on the magnetic field. In our approach, the nodes are considered as a set of stationary/mobile magnetic nodes where these magnets can attract and repulse under the influence of an acting force. Based on the magnetic force between magnetic poles, we propose the law of node gravitation LNG and node repulsion LNR. Our method identifies a set of stationary magnetic nodes (SMNs). Each SMN attracts a group of mobile nodes and at the same time, they do not influence one another by any acting force. Then, we construct the stationary magnetic communities (SMCs) based on the law of community gravitation and repulsion. Our method finishes when all the magnets in the network become stationary. The experimental results are presented to prove the performance of our method in several real networks including weighted and unweighted networks.

scholarly journals Origin of Giant Radio Pulses

2004 ◽  
Vol 218 ◽  
pp. 369-372 ◽  
Author(s):  
Ya. N. Istomin
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
Magnetic Reconnection ◽  
Electric Discharge ◽  
Alfvén Waves ◽  
Light Cylinder ◽  
Zero Line ◽  
Field Lines ◽  
Magnetic Poles ◽  
The Magnetic Field

A model for the origin of giant radio pulses is suggested. Radio emission is generated by the electric discharge taking place due to the magnetic reconnection of field lines connecting the opposite magnetic poles. The reconnection occurs in the region of the light cylinder near the zero line of the magnetic field. The coherent mechanism of radiation is pure maser amplification of Alfvén waves. The radiated frequencies are found.

Magnetic-Field-Assisted Finishing with Axial Vibration -Deburring on Internal Holes and Internal Finishing of Pipes with Rectangular Cross-Sections-

2007 ◽  
Vol 329 ◽  
pp. 261-266 ◽  
Author(s):  
Hideki Fujita ◽  
Takeo Shinmura ◽  
H. Yamaguchi
Keyword(s):  
Magnetic Field ◽  
Iron Powder ◽  
Cross Sections ◽  
Magnetic Field Effects ◽  
Axial Vibration ◽  
Field Effects ◽  
Magnetic Poles ◽  
The Magnetic Field

In the magnetic-field-assisted finishing, grinding powder mixed with iron powder is placed inside a part and vibration is applied to the part under magnetic field. Effects of the process on deburring of step-wise holes and internal roughness of brass square pipes were examined. Rotation was given to the pipes with step-wise holes, while the magnetic poles were vibrated. Axial vibration was given to the square pipes, while the magnetic poles were fixed. Burr formed by drilling at internal edges was effectively removed by the process. Inside roughness of the square pipe was successfully finished to 0.023 μm Ra.

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