Design and Control of Field-Free Region Using Two Permanent Magnets for Selective Magnetic Hyperthermia

The use of the linear magnetostrictive motor (LMM) in outer space, in the absence of Earth’s gravitational field and where extreme temperatures manifest, involves innovative technical solutions that result in significant construction changes. This paper highlights these constructive changes and presents the mathematical modeling followed by the numerical simulation of different operating regimes of LMM. The novelty of the design resides in using a bias coil instead, in addition to permanent magnets, to magnetize the magnetostrictive core and pulse width modulated (PWM) power sources to control the two coils of the LMM (bias and activation). The total absorbed current is less than 2 A, which results in the reduction of Joule losses. Moreover, a PWM source is provided to power and control a set of three Peltier elements aimed at cooling the device. The experiments validate the design of the LMM, which elicits it to power and control devices that may modulate fuel injection for rocket engines or for machines used to adjust positioning on circumterrestrial orbits.

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Design and control of the miniature maglev using electromagnets and permanent magnets in magnetic levitation system

ICCAS 2010 ◽

10.1109/iccas.2010.5670257 ◽

2010 ◽

Author(s):

Jeong-Min Jo ◽

Young-Jae Han ◽

Chang-Young Lee ◽

Bu-Byung Kang ◽

Kyung-Min Kim ◽

...

Keyword(s):

Permanent Magnets ◽

Magnetic Levitation ◽

Levitation System ◽

Magnetic Levitation System ◽

And Control

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Effect of cesium on H− production in a field free region of a volume source

Review of Scientific Instruments ◽

10.1063/1.1148605 ◽

1998 ◽

Vol 69 (2) ◽

pp. 974-976 ◽

Cited By ~ 4

Author(s):

M. Nishiura ◽

M. Sasao ◽

M. Wada

Keyword(s):

Volume Source ◽

Free Region ◽

Field Free Region

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Electroactive Composites with Block Copolymer-Templated Iron Oxide Nanoparticles for Magnetic Hyperthermia Application

Polymers ◽

10.3390/polym11091430 ◽

2019 ◽

Vol 11 (9) ◽

pp. 1430

Author(s):

Shu-Chian Yang ◽

Chun-Yu Chen ◽

Hung-Yu Wan ◽

Szu-Ying Huang ◽

Ta-I Yang

Keyword(s):

Iron Oxide ◽

Block Copolymer ◽

Magnetic Particles ◽

Magnetic Hyperthermia ◽

Promising Technique ◽

Cathodic Current ◽

Heating Performance ◽

Relaxation Loss ◽

And Control ◽

Human Death

Cancer has been one of the leading causes of human death for centuries. Magnetic hyperthermia is a promising technique to confine and control cancers. However, particles used in magnetic hyperthermia leaking from where the cancers are located could compromise human health. Therefore, we developed electroactive iron oxide/block copolymer composites to tackle the leakage problem. Experimental results show that oleylamine-modified magnetic iron oxide (Fe3O4) particles and electroactive tetraaniline (TA) could be templated in the self-assembled microstructures of sulfonated [styrene-b-(ethylene-ran-butylene)-b-styrene] (S-SEBS) block copolymers. Various amounts of Fe3O4 particles and TA oligomer were incorporated in S-SEBS block copolymer and their electroactive behavior was confirmed by exhibiting two pairs of well-defined anodic and cathodic current peaks in cyclic voltammetry tests. The heating performance of the resultant TA/Fe3O4/polymer composites improved on increasing the added amount of Fe3O4 particles and TA oligomers. Both Fe3O4 and TA can contribute to improved heating performance, but Fe3O4 possesses a greater contribution than TA does. Hence, the main source for increasing the composites’ temperature is Neel relaxation loss from Fe3O4 magnetic particles.

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The ASACUSA antihydrogen and hydrogen program: results and prospects

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2017.0273 ◽

2018 ◽

Vol 376 (2116) ◽

pp. 20170273 ◽

Cited By ~ 13

Author(s):

C. Malbrunot ◽

C. Amsler ◽

S. Arguedas Cuendis ◽

H. Breuker ◽

P. Dupre ◽

...

Keyword(s):

Ground State ◽

Hyperfine Splitting ◽

Atomic Spectroscopy ◽

Standard Model Extension ◽

Production Region ◽

Free Region ◽

Model Extension ◽

The Standard Model ◽

Field Free Region ◽

Antihydrogen Production

The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 m away from their production region. This was the first observation of ‘cold’ antihydrogen in a magnetic field free region. In parallel to the progress on the antihydrogen production, the spectroscopy beamline was tested with a source of hydrogen. This led to a measurement at a relative precision of 2.7×10 −9 which constitutes the most precise measurement of the hydrogen hyperfine splitting in a beam. Further measurements with an upgraded hydrogen apparatus are motivated by CPT and Lorentz violation tests in the framework of the Standard Model Extension. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold antiatoms in the ground state. The first antihydrogen quantum states scan at the entrance of the spectroscopy apparatus was realized in 2016 and is presented here. The prospects for a ppm measurement are also discussed. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.

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Field-Free Region (FFR)

IUPAC Standards Online ◽

10.1515/iupac.85.0457 ◽

2016 ◽

Author(s):

Kermit K. Murray ◽

Robert K. Boyd ◽

Marcos N. Eberlin ◽

G. John Langley ◽

Liang Li ◽

...

Keyword(s):

Free Region ◽

Field Free Region

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Synthesis and properties of an electron-ion plasma

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1961.0204 ◽

1961 ◽

Vol 264 (1318) ◽

pp. 355-366

Keyword(s):

Plasma Frequency ◽

Electron Velocity ◽

Signal Frequency ◽

Electric Signal ◽

Lithium Aluminium ◽

Ion Plasma ◽

Free Region ◽

Field Free Region ◽

Field Lines ◽

Singly Charged

It is shown that a low-density neutral plasma in a steady state, consisting of electrons and ions only, can be obtained by injecting opposing beams of charges into a field-free region. With the aid of electrostatic probes the electric neutrality of such a synthetic plasma can be controlled. Experiments were carried out with a plasma consisting of singly charged lithium ions of energy up to 300 eV drawn from a lithium-aluminium silicate emitter and electrons of energy 12 to 24 eV drawn from a dispenser cathode. The residual gas pressure was kept so low that collision with atoms did not contribute to the effects measured. A continuous electric signal of frequency 2 to 30 Mc/s was transmitted through the plasma. Whereas in a gaseous plasma a resonance peak at the plasma frequency was found by varying either the signal frequency or the discharge current (and thus the plasma frequency), a resonance absorption was recorded in an electron-ion plasma. This suggests that for frequencies lower than that corresponding to an individual electron crossing the region of influence of the signal the phase of the electron oscillation always tends to reduce the local field. As the electron velocity was raised the magnitude of absorption was shown to grow. The transmission in the electron-ion plasma was also studied with a magnetic field parallel to the direction of the beams which caused the electrons to circulate about the field lines. By varying the field strength the absorption was found to reach a maximum when the electron cyclotron frequency equals the plasma frequency. The width of the absorption curves for the electron-ion plasma was greater than that with an electron beam only. The interaction between ions and electrons has been demonstrated by measuring the electric noise produced by the plasma. For electron energies between 10 and 70 eV the increase in noise corresponds to a change of the electron temperature by 400 to 500 °K or to an average scattering angle of 1 to 3°.

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Positron extraction to an electromagnetic field free region

Journal of Physics B Atomic Molecular and Optical Physics ◽

10.1088/0953-4075/49/1/014001 ◽

2015 ◽

Vol 49 (1) ◽

pp. 014001 ◽

Cited By ~ 5

Author(s):

D A Cooke ◽

G Barandun ◽

S Vergani ◽

B Brown ◽

A Rubbia ◽

...

Keyword(s):

Electromagnetic Field ◽

Free Region ◽

Field Free Region

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Modeling and Control of Proportional Valve with Synchronous Motor

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.220-221.457 ◽

2015 ◽

Vol 220-221 ◽

pp. 457-462 ◽

Cited By ~ 2

Author(s):

Andrzej Milecki ◽

Dominik Rybarczyk

Keyword(s):

Permanent Magnets ◽

Dead Zone ◽

Flow Characteristics ◽

Synchronous Motor ◽

Hydraulic Actuator ◽

Servo Drive ◽

Proportional Valve ◽

Modeling And Control ◽

Basic Characteristics ◽

And Control

The paper describes the research results of modeling and control of proportional valve with synchronous motor type PMSM (Permanent Magnets Synchronous Motor). In the paper, a simulation model of the proposed valve was developed and described. The model included the square root flow characteristics, nonlinearity of the hydraulic actuator, valve dead zone and saturation of the flow. The study included the investigations of the basic characteristics, such as valve flow characteristic and step responses. In order to determine the basic parameters of the valve, the test stand was built, on which the new valve and the servo drive with this valve were tested. A servo drive control system was based on PLC with touch panel and inverter module. In the paper, the chosen investigations results of the valve and the servo drive system are presented and shortly discussed.

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Behaviorof Ion Beams For Triplet Quadrupole Lenses

Al-Mustansiriyah Journal of Science ◽

10.23851/mjs.v27i5.174 ◽

2017 ◽

Vol 27 (5) ◽

pp. 95

Author(s):

Hiyam Chasib Majed ◽

Ameera Jawad Kadhem ◽

Esraa Akram Abass ◽

Taghreed Khalid Hameed

Keyword(s):

Ion Beam ◽

Free Field ◽

Charged Particles ◽

Vertical Plane ◽

System Matrix ◽

Free Region ◽

Field Free Region ◽

Region Length ◽

Quadrupole Lenses ◽

Focusing Properties

This research includes a study to understand the behavior of charged particles beam through consideration of systems of quadrupole triplet reaching to the optimum design of beam transport through a system of triplet quadrupole triplet lenses. In this work, tracing the path of charged particles beam has been within the free field space and quadrupole electrostatic lens system which include the triplet quadrupolelens by using matrices to described particle trajectories throughout the system. Matrix representation deals with ion beam as bunched and representing phase ellipse for both horizontal and vertical planes. The present work investigated the effect of the main parameters of triplet quadruple such as length of quadrupole, the distance between the lenses, voltage applying on lenses,second field free region length. Matlab program built to study these parameters, the results indicated that good focusing properties for both horizontal and vertical plane.

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