Theory of ion-cyclotron resonances and diffusion at high energy in the 2XIIB magnetic mirror experiment

1983 ◽  
Vol 26 (1) ◽  
pp. 244
Author(s):  
M. Tagger
Keyword(s):  
High Energy ◽  
Magnetic Mirror ◽  
Ion Cyclotron ◽  
And Diffusion

Investigation of the confinement of high energy non-neutral proton beam in a bent magnetic mirror

2022 ◽  
Author(s):  
Fangping Wang ◽  
Heng Zhang ◽  
Sheng Zhang ◽  
Wenshan Duan
Keyword(s):  
Proton Beam ◽  
Oscillation Frequency ◽  
Loss Rate ◽  
Cyclotron Frequency ◽  
Deflection Angle ◽  
High Energy ◽  
Magnetic Mirror ◽  
Number Density ◽  
Ion Cyclotron ◽  
Electrostatic Oscillation

Abstract By using the Particle-In-Cell(PIC) simulation method, we study how the proton beam is confined in a bent magnetic mirror. It is found that the loss rate of the charged particles in a bent mirror is less than that in the axi-symmetric mirror. For a special bent mirror with the deflection angle of the coils $\alpha=45^{\circ}$, it is found that the loss rate reaches maximum value at certain ion number density where the ion electrostatic oscillation frequency is equal to the ion cyclotron frequency. In addition, the loss rate is irrelevant to the direction of the proton beam. Our results may be helpful to devise a mirror. In order to obtain the least loss rate, we may choose a appropriate deflection angle, and have to avoid a certain ion number density at which the ion electrostatic oscillation frequency is equal to the ion cyclotron frequency.

scholarly journals Pollution Monitoring Based on Vehicle-borne Particulate Quantum Lidar

2020 ◽  
Vol 237 ◽  
pp. 03023
Author(s):  
Xu Wang ◽  
Jing Gao ◽  
Yuefeng Zhao
Keyword(s):  
Environmental Protection ◽  
Dimensional Space ◽  
Three Dimensional ◽  
High Energy ◽  
Pollution Monitoring ◽  
Observation Area ◽  
Surrounding Areas ◽  
Environmental Network ◽  
And Diffusion ◽  
Three Dimensional Space

From February 7 to 10, 2018, due to unfavorable meteorological conditions, a process of air pollution occurred in Hefei and its surrounding areas, and moderate to severe pollution occurred in the municipal districts. Aiming at the pollution process in Hefei City, under the leadership of Hefei Environmental Protection Bureau and with the support of Hefei Environmental Protection Sub-bureau, four fixed observation points were selected to carry out all-weather environmental network monitoring pilot projects in Hefei municipal jurisdiction area. At the same time, a "mobile monitoring vehicle of atmospheric environmental pollution" was arranged to conduct all-weather walking observation to real-time monitor the spatial distribution and three-dimensional space of pollutants in Hefei urban area、inter-transport and space subsidence and diffusion. The RaySound Series Portable high-energy high-frequency lidar was used in the environmental networking monitoring in Hefei. The air quality in the observation area was evaluated comprehensively by using the mode of fixed vertical monitoring, plane scanning monitoring and mobile walking monitoring.

Ion Heating and High-Energy-Particle Production by Ion-Cyclotron Heating in the Large Helical Device

2000 ◽  
Vol 85 (21) ◽  
pp. 4530-4533 ◽  
Author(s):  
T. Mutoh ◽  
R. Kumazawa ◽  
T. Seki ◽  
T. Watari ◽  
K. Saito ◽  
...  
Keyword(s):  
Particle Production ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Ion Heating ◽  
Ion Cyclotron

Synthesis and Characterization of Nanostructured Mechanical Cu-Fe-Co Alloy

2018 ◽  
Vol 941 ◽  
pp. 1232-1237
Author(s):  
Alisiya Biserova-Tahchieva ◽  
Isabel López-Jiménez ◽  
Núria Llorca-Isern
Keyword(s):  
Defect Density ◽  
Nanocrystalline Structure ◽  
High Energy ◽  
Magnetic Behaviour ◽  
X Ray Diffraction ◽  
X Ray ◽  
Soft Ferromagnetic ◽  
Hours Of Work ◽  
And Diffusion

Nanocrystalline structure of CuFeCo (50:25:25 wt%) alloy has been obtained by high energy mechanical milling from elemental metal powder mixture during large hours of work. Phase transformations and diffusion in the system subjected to heat treatment are discussed. Thermal stability at high temperatures is analysed and considered of importance for several applications. The nanostructure was studied by employing X-Ray diffraction and electron microscopy. It has been determined the reduction in crystallite size and the induced microstrain by the milling time. The solid solution achievement through the increment of defect density was confirmed by Mössbauer analysis. Magnetic behaviour was analysed through magnetization technique entailing their soft ferromagnetic behaviour related to the microstructural changes.

Ion cyclotron range of frequencies heating and high-energy particle production in the Large Helical Device

2003 ◽  
Vol 43 (8) ◽  
pp. 738-743 ◽  
Author(s):  
T Mutoh ◽  
R Kumazawa ◽  
T Seki ◽  
K Saito ◽  
T Watari ◽  
...  
Keyword(s):  
Particle Production ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Ion Cyclotron

Preparation of TiAl alloy powder by high-energy ball milling and diffusion reaction at low temperature

Rare Metals ◽  
2015 ◽  
Vol 37 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Hui-Ping Shao ◽  
Zhi Wang ◽  
Tao Lin ◽  
Qing Ye ◽  
Zhi-Meng Guo
Keyword(s):  
Low Temperature ◽  
Ball Milling ◽  
Alloy Powder ◽  
Tial Alloy ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Diffusion Reaction ◽  
Energy Ball ◽  
And Diffusion

scholarly journals Cosmic-Ray Transport and Acceleration

1994 ◽  
Vol 142 ◽  
pp. 926-936
Author(s):  
Reinhard Schlickeiser
Keyword(s):  
Cosmic Rays ◽  
Decisive Role ◽  
Cosmic Ray ◽  
High Energy ◽  
Galactic Cosmic Rays ◽  
Diffusion Term ◽  
Solar Particle Events ◽  
High Energy Cosmic Rays ◽  
Propagation Parameters ◽  
And Diffusion

AbstractWe review the transport and acceleration of cosmic rays concentrating on the origin of galactic cosmic rays. Quasi-linear theory for the acceleration rates and propagation parameters of charged test particles combined with the plasma wave viewpoint of modeling weak cosmic electromagnetic turbulence provides a qualitatively and quantitatively correct description of key observations. Incorporating finite frequency effects, dispersion, and damping of the plasma waves are essential in overcoming classical discrepancies with observations as the Kfit - Kql discrepancy of solar particle events. We show that the diffusion-convection transport equation in its general form contains spatial convection and diffusion terms as well as momentum convection and diffusion terms. In particular, the latter momentum diffusion term plays a decisive role in the acceleration of cosmic rays at super-Alfvénic supernova shock fronts, and in the acceleration of ultra-high-energy cosmic rays by distributed acceleration in our own galaxy.Subject headings: acceleration of particles — convection — cosmic rays — diffusion — shock waves

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