Development of an undulator with a variable magnetic field profile

An undulator generating a magnetic field whose longitudinal profile is arbitrarily varied has been developed, which is one of the key components in a number of proposed new concepts in free-electron lasers. The undulator is composed of magnet modules, each of which corresponds to a single undulator period, and is driven by a linear actuator to change the magnetic gap independently. To relax the requirement on the actuator, the mechanical load on each module due to magnetic force acting from opponent and adjacent modules is reduced by means of two kinds of spring systems. The performance of the constructed undulator has been successfully demonstrated by magnetic measurement and characterization of synchrotron radiation.

Download Full-text

Secondary resonance magnetic force microscopy using an external magnetic field for characterization of magnetic thin films

Applied Physics Letters ◽

10.1063/1.4930878 ◽

2015 ◽

Vol 107 (10) ◽

pp. 103110 ◽

Cited By ~ 4

Author(s):

Dongzi Liu ◽

Kangxin Mo ◽

Xidong Ding ◽

Liangbing Zhao ◽

Guocong Lin ◽

...

Keyword(s):

Magnetic Field ◽

Thin Films ◽

External Magnetic Field ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Magnetic Thin Films ◽

Secondary Resonance ◽

Force Microscopy

Download Full-text

Characterization of Magnetic Field Distribution in a Trailing-Edge Shielded Head by Frequency-Modulated Magnetic Force Microscopy

IEEE Transactions on Magnetics ◽

10.1109/tmag.2010.2045349 ◽

2010 ◽

Vol 46 (6) ◽

pp. 1479-1482 ◽

Cited By ~ 4

Author(s):

Wei Lu ◽

Kodai Hatakeyama ◽

Genta Egawa ◽

Satoru Yoshimura ◽

Hitoshi Saito

Keyword(s):

Magnetic Field ◽

Field Distribution ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Magnetic Field Distribution ◽

Trailing Edge ◽

Force Microscopy

Download Full-text

Electrical characterization of liquid-phase epitaxially grown single-crystal films of mercury cadmium telluride by variable-magnetic-field Hall measurements

Semiconductor Science and Technology ◽

10.1088/0268-1242/9/9/020 ◽

1994 ◽

Vol 9 (9) ◽

pp. 1696-1705 ◽

Cited By ~ 9

Author(s):

J S Kim ◽

D G Seiler ◽

L Colombo ◽

M C Chen

Keyword(s):

Magnetic Field ◽

Liquid Phase ◽

Cadmium Telluride ◽

Mercury Cadmium Telluride ◽

Electrical Characterization ◽

Variable Magnetic Field ◽

Single Crystal Films ◽

Crystal Films ◽

Grown Single Crystal

Download Full-text

Numerical and experimental study of dynamics of two pendulums under a magnetic field

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering ◽

10.1177/0959651819828878 ◽

2019 ◽

Vol 233 (4) ◽

pp. 441-453 ◽

Cited By ~ 2

Author(s):

Krystian Polczyński ◽

Adam Wijata ◽

Jan Awrejcewicz ◽

Grzegorz Wasilewski

Keyword(s):

Magnetic Field ◽

Magnetic Force ◽

Permanent Magnets ◽

Magnetic Interaction ◽

Variable Magnetic Field ◽

Phase Portraits ◽

Bifurcation Diagrams ◽

Regular Motion ◽

Novel Model ◽

Two Degree Of Freedom

In this article, a two-degree-of-freedom system consisting of two pendulums with magnets embedded in a variable magnetic field is investigated experimentally and numerically. Pivots of the pendulums are coupled by an elastic element. The magnetic interaction originates from permanent magnets, mounted at free ends of the pendulums and current-powered air coils underneath. A novel model for the magnetic force is proposed and verified experimentally. Nonlinear dynamics of the system is examined by means of time series, bifurcation diagrams, phase portraits, and Poincaré sections. Regions of chaotic and regular motion are predicted numerically and justified experimentally. Multiperiodic motion and coexisting solutions are detected, and pictures in basins of their attraction are reported, among other.

Download Full-text

Characterization of Superconducting PrBa2Cu3Ox

International Journal of Modern Physics B ◽

10.1142/s0217979298002398 ◽

1998 ◽

Vol 12 (29n31) ◽

pp. 3242-3250

Author(s):

Zhigang Zou ◽

Jinhua Ye ◽

Kunihiko Oka ◽

Yoshikazu Nishihara

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Single Crystals ◽

Superconducting State ◽

Magnetic Measurement ◽

Stacking Faults ◽

Critical Magnetic Field ◽

Oxygen Annealing ◽

X Ray

The crystal structures of superconducting and nonsuperconducting PrBa2Cu3O x crystals were investigated using a single crystal X-ray precession camera. A large amount of stacking faults were observed in h0l reflections of as-grown supconducting PrBa2Cu3O x single crystals. These diffusing could be relaxed after oxygen annealing. Meanwhile, intensities of 003n (n = 1, 2, 3…) diffraction reflections of annealed crystal were increased significantly, indicating that the structural ordering of 1/3n unit cell was improved. Magnetic measurement exhibited that the superconducting state of PrBa2Cu3O x , is sensitive to magnetic fields and the magnetic fields dependence of the flux melting temperature showed that the sample has the smaller critical magnetic field than YBa2Cu3O x.

Download Full-text

A mechanical characterization of electroconductive magnetorheological elastomer and semi-analytical modeling of magnetic force

International Journal of Modern Physics B ◽

10.1142/s0217979219502904 ◽

2019 ◽

Vol 33 (25) ◽

pp. 1950290

Author(s):

Salah Aguib ◽

Abdelkader Nour ◽

Toufik Djedid

Keyword(s):

Magnetic Field ◽

Magnetic Force ◽

Magnetic Field Intensity ◽

Experimental Characterization ◽

Iron Particles ◽

Magnetorheological Elastomer ◽

Magnetorheological Elastomers ◽

Global Industry ◽

The Magnetic Field

Materials with novel properties and compounds of intelligent material combinations are a key to innovation in various successful sectors of the global industry as well as for its export. Magnetorheological elastomer materials have interesting physical properties; most of these properties are modified and adapted under the influence of external parameters such as the magnetic field. In this work, an experimental characterization of the magnetorheological elastomers (MRE) loaded with 20% of the iron particles was made. The results showed that the properties of these materials can be modified very selectively and reversibly under the influence of magnetic field, where the stiffness of the material varies depending on the magnetic field intensity that influences the attractive force between iron particles.

Download Full-text

Synthesis and Mechanical Characterization of Magnetic Hybrid Materials with PVB as Polymeric Matrix for Micro-Actuation Applications

MRS Proceedings ◽

10.1557/opl.2014.525 ◽

2014 ◽

Vol 1708 ◽

Cited By ~ 2

Author(s):

Beatriz López-Walle ◽

Jesús Romo-Rico ◽

Jesús Puente-Córdova ◽

Martín Reyes-Melo

Keyword(s):

Magnetic Field ◽

Electric Power ◽

Hybrid Materials ◽

Mechanical Characterization ◽

Polyvinyl Butyral ◽

Variable Magnetic Field ◽

Potential Applications ◽

Micro Actuators ◽

Maximal Displacement

ABSTRACTThis work presents two multifunctional magnetic hybrid materials with potential applications as micro-actuators. The first one consists of iron oxide (Fe2O3) nanoparticles embedded in polyvinyl butyral (PVB). For the second one, Fe2O3 nanoparticles, coated with carboxymethyl cellulose (CMC), were embedded in PVB. The main objective is to describe their synthesis and morphological and magnetic characterizations, and to evaluate their displacement against a variable magnetic field. The maximal displacement is obtained by the (Fe2O3-CMC)/PVB beam-shaped structure (28.37 x 2.6 x 0.183 mm3) with 843 μm; the maximal electric power being 1.14 W. The levels of displacement induced in both hybrid materials as a response of the external magnetic field, besides the low electric power required, let us conclude that the studied materials could be considered as good candidates to micro-actuators applications.

Download Full-text