Improvement of charged particles transport across a transverse magnetic filter field by electrostatic trapping of magnetized electrons

2014 ◽  
Vol 21 (7) ◽  
pp. 072118 ◽  
Author(s):  
B. K. Das ◽  
P. Hazarika ◽  
M. Chakraborty ◽  
M. Bandyopadhyay
Keyword(s):  
Charged Particles ◽  
Transverse Magnetic ◽  
Magnetic Filter ◽  
Electrostatic Trapping

Stochastic analysis of pitch angle scattering of charged particles by transverse magnetic waves

2009 ◽  
Vol 16 (11) ◽  
pp. 112306 ◽  
Author(s):  
Don S. Lemons ◽  
Kaijun Liu ◽  
Dan Winske ◽  
S. Peter Gary
Keyword(s):  
Pitch Angle ◽  
Stochastic Analysis ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Angle Scattering ◽  
Magnetic Waves

scholarly journals Trapping and acceleration of charged particles in Bessel beams

2006 ◽  
Vol 24 (4) ◽  
pp. 559-566 ◽  
Author(s):  
V. H. MELLADO ◽  
S. HACYAN ◽  
R. JÁUREGUI
Keyword(s):  
Electromagnetic Field ◽  
Transverse Electric ◽  
Bessel Beam ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Optical Vortices ◽  
Bessel Beams ◽  
Relativistic Charged Particle ◽  
Constants Of Motion ◽  
Dynamical Properties

We study the motion of a classical relativistic charged particle in the electromagnetic field of a Bessel beam exhibiting vector optical vortices, and show how its dynamical properties, such as linear and angular momentum, are transmitted to the particle. The effects of different polarizations are taken into account using transverse electric and magnetic modes, and their superpositions. The constants of motion are identified for the most general case. We report typical numerical results for axial and radial motion for various configurations, with an estimate of expected axial accelerations when transverse magnetic Bessel modes are used. The Lorentz transformation properties of the field are used throughout in order to simplify the calculations.

scholarly journals Surface-modified elastomeric nanofluidic devices for single nanoparticle trapping

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Deepika Sharma ◽  
Roderick Y. H. Lim ◽  
Thomas Pfohl ◽  
Yasin Ekinci
Keyword(s):  
Surface Modification ◽  
Charged Particles ◽  
Aqueous Environment ◽  
Homogeneous Surface ◽  
Single Nanoparticle ◽  
Nanofluidic Devices ◽  
Surface Modified ◽  
Trapping Device ◽  
Trapping Devices ◽  
Electrostatic Trapping

AbstractOur work focuses on the development of simpler and effective production of nanofluidic devices for high-throughput charged single nanoparticle trapping in an aqueous environment. Single nanoparticle confinement using electrostatic trapping has been an effective approach to study the fundamental properties of charged molecules under a controlled aqueous environment. Conventionally, geometry-induced electrostatic trapping devices are fabricated using SiOx-based substrates and comprise nanochannels imbedded with nanoindentations such as nanopockets, nanoslits and nanogrids. These geometry-induced electrostatic trapping devices can only trap negatively charged particles, and therefore, to trap positively charged particles, modification of the device surface is required. However, the surface modification process of a nanofluidic device is cumbersome and time consuming. Therefore, here, we present a novel approach for the development of surface-modified geometry-induced electrostatic trapping devices that reduces the surface modification time from nearly 5 days to just a few hours. We utilized polydimethylsiloxane for the development of a surface-modified geometry-induced electrostatic trapping device. To demonstrate the device efficiency and success of the surface modification procedure, a comparison study between a PDMS-based geometry-induced electrostatic trapping device and the surface-modified polydimethylsiloxane-based device was performed. The device surface was modified with two layers of polyelectrolytes (1: poly(ethyleneimine) and 2: poly(styrenesulfonate)), which led to an overall negatively charged surface. Our experiments revealed the presence of a homogeneous surface charge density inside the fluidic devices and equivalent trapping strengths for the surface-modified and native polydimethylsiloxane-based geometry-induced electrostatic trapping devices. This work paves the way towards broader use of geometry-induced electrostatic trapping devices in the fields of biosensing, disease diagnosis, molecular analysis, fluid quality control and pathogen detection.

scholarly journals Distribution of the charged particles of a gas-discharge laser plasma in a transverse magnetic field. I. Calculation model

2021 ◽  
Vol 2059 (1) ◽  
pp. 012013
Author(s):  
S A Martsinukov ◽  
D K Kostrin
Keyword(s):  
Magnetic Field ◽  
Transverse Magnetic Field ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Gas Discharge ◽  
Calculation Model ◽  
Independent Components ◽  
Electrons And Ions ◽  
Weakly Ionized ◽  
Discharge Laser

Abstract The paper considers a physical and mathematical model describing the influence of an external transverse magnetic field on the distribution of charged particles in a positive column of a gas discharge. This model is developed in relation to the weakly ionized plasma of a gas-discharge laser. In this case, the plasma flow is considered as an analog of a liquid consisting of two practically independent components – electrons and ions.

scholarly journals Distribution of the charged particles of a gas-discharge laser plasma in a transverse magnetic field. II. Experimental study

2021 ◽  
Vol 2059 (1) ◽  
pp. 012014
Author(s):  
S A Martsinukov ◽  
D K Kostrin
Keyword(s):  
Magnetic Field ◽  
Mathematical Model ◽  
Experimental Study ◽  
Transverse Magnetic Field ◽  
Positive Column ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Gas Discharge ◽  
Gas Mixture ◽  
Discharge Laser

Abstract The paper presents an experimental verification of the adequacy of a physical and mathematical model describing the influence of an external transverse magnetic field on the distribution of the charged particles in a positive column of a gas discharge. A gas-discharge laser located in a transverse magnetic field was used to conduct the study. The vacuum installation allows pumping out the system and feeding the gas mixture into it under a certain pressure. The data obtained during the experiments differ from the calculated ones by no more than 4–5 %.

Critical Examination of a Proposed Charged-Particle Stern–Gerlach Experiment

1972 ◽  
Vol 50 (3) ◽  
pp. 185-195
Author(s):  
Thomas F. Knott
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Phase Space ◽  
Initial Phase ◽  
Initial Conditions ◽  
Transverse Velocity ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Critical Examination ◽  
Focusing Effect

It has been proposed by Enga and Bloom that combined electric and magnetic helical quadrupole fields may be used to perform a Stern–Gerlach experiment on charged particles. A detailed investigation shows that the longitudinal Lorentz force due to coupling of the transverse velocity of the particles to the transverse magnetic field produces an additional focusing effect which masks the Stern–Gerlach force in large regions of initial phase space. Consideration of uncompensated magnetic fields, produced by small random variations in conductor dimensions and location, shows that the tolerances required to preserve spin separation in the useful range of initial conditions are several orders of magnitude higher than can be achieved at this time.

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

Sign in / Sign up

Export Citation Format

Share Document