scholarly journals Безаберрационная линза и корректоры аберраций

2020 ◽  
Vol 90 (6) ◽  
pp. 1016
Author(s):  
В.В. Лукашевич
Keyword(s):  
Phase Diagram ◽  
Ion Beam ◽  
Axially Symmetric ◽  
Diagram Method ◽  
Electrostatic Lenses

An aberration-free four-electrode lens is described for forming an ion beam for mass separators or spectrometers. The lens is a modification of the transaxial lens, in which the circular gaps between the electrodes are replaced by elliptical gaps. A lens converts an axially symmetric beam into a tape-type beam. The lens parameters are found using the phase diagram method. Using the same method, a new aberration corrector for electrostatic lenses and a new sector magnet aberration corrector are developed.

Ion Irradiation Effects on Ho2+xTi2-xO7-x/2 (x=0, 0.4 and 0.67)

2012 ◽  
Vol 512-515 ◽  
pp. 643-647
Author(s):  
Yu Hong Li ◽  
Yong Qiang Wang ◽  
Juan Wen ◽  
Valdez A. James ◽  
Kurt E. Sickafus
Keyword(s):  
Phase Diagram ◽  
Ion Irradiation ◽  
Incident Angle ◽  
Ion Beam ◽  
National Laboratory ◽  
Grazing Incidence ◽  
Phase Transformation Temperature ◽  
Synthesis Methods ◽  
Threshold Fluence ◽  
Β Phase

We recently synthesized different composition polycrystalline Ho2+xTi2-xO7-x/2 (x=0, 0.4 and 0.67), which is derivative fluorite compounds known as and pyrochlore phases in Ho3O2-TiO2 phase diagram by using conventional solid state synthesis methods. The samples were irradiated with 400 keV Ne2+ ions at cryogenic temperature (~77 K), using the Danfysik ion accelerator at the Ion Beam Materials Laboratory (IBML) of Los Alamos National Laboratory (LANL). The irradiation fluences in the experiments ranged from 5×1014-5×1015ions/cm2. An order-to-disorder (O-D) transformation was observed for α, β and pyrochlore phases, as determined using grazing incidence X-ray diffraction (GIXRD) at an incident angle of 0.25°. The O-D transformation threshold fluence for α phase was found to be noticeably lower than those for β phase and pyrochlore, and the O-D transformation threshold fluence for β phase was the highest. The O-D transformation threshold fluence was found to be coherent with the phase transformation temperature in the Ho3O2-TiO2temperature-composition (T-C) phase diagram.

Phase Diagram Method of Solvent Evaluation

1938 ◽  
Vol 30 (2) ◽  
pp. 199-203 ◽  
Author(s):  
Arthur Doolittle
Keyword(s):  
Phase Diagram ◽  
Diagram Method

Preparation of MgSO4·H2O by the Phase Diagram Method

2013 ◽  
Vol 807-809 ◽  
pp. 2788-2792
Author(s):  
Hong Xia Li ◽  
De Wen Zeng ◽  
Yan Yao
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Ternary System ◽  
Magnesium Sulfate ◽  
Phase Diagrams ◽  
Industrial Production ◽  
Diagram Method ◽  
Equilibrium Time ◽  
Salt Pans ◽  
C 50

Kieserite (MgSO4·H2O) which has great application in recent years, was prepared according to the binary system MgSO4H2O at 80°C and the ternary system MgCl2MgSO4H2O at 25°C, 50°C and 75°C phase diagrams in this research. We reveal that the pure MgSO4·H2O is acquired in the ternary system MgCl2MgSO4H2O at 75°C with MgCl2 (23.966%~37.93%) for the equilibrium time 5~7days. The higher hydrated magnesium sulfate can be obtained in the ternary system with MgCl2 (0~34.52%) at 25°C, (0~35.684%) at 50°C, and (0~23.966%) at 75°C for 5~7days. These results are beneficial for the industrial production by converting MgSO4·7H2O and MgCl2·6H2O which are not fully exploited in salt pans into the useful MgSO4·H2O.

A 1 eV - 1000 eV ion beam system designed for the calibration of low-energy ion mass spectrometers

2020 ◽  
Author(s):  
Yiren Li ◽  
Bin Miao ◽  
Xinjun Hao ◽  
Tielong Zhang ◽  
Yuming Wang
Keyword(s):  
Imaging System ◽  
Ion Beam ◽  
Low Energy ◽  
Beam Diagnostics ◽  
Large Area ◽  
Mass Spectrometers ◽  
Faraday Cup ◽  
Beam System ◽  
Electrostatic Lenses ◽  
Positive Ion

<p>For the calibration of space plasma analyzers, in particular low-energy ion mass spectrometers, a low energy ion beam system was developed. The positive ion beam is produced by a hot-cathode penning source and modified by a series of electrostatic lenses. And a 75 mm diameter 2-D imaging system and a Faraday cup mounted on movable arms are used for ion beam diagnostics. With protons as primary species, the system provides an ion beam in the energy range of 1 eV - 1000 eV with a large area ( ~ 50 cm<sup>2</sup>), highly parallel ( ± 0.5°), and spatially uniform ( ± 5%).</p>

Precipitation Prediction and Experimental Clarification of Mg-Al-Sn System

2009 ◽  
Vol 620-622 ◽  
pp. 295-298
Author(s):  
Jin Young Kim ◽  
Eun Jung Kim ◽  
Jeong Whan Han
Keyword(s):  
Phase Diagram ◽  
Thermodynamic Description ◽  
Alloy System ◽  
Detailed Comparison ◽  
Precipitation Process ◽  
Diagram Method ◽  
Precipitation Prediction ◽  
Mg17al12 Phase ◽  
Commercial Package ◽  
Lower Temperature

Phase equilibrium of the Mg-Al-Sn alloy system was calculated in detail by utilizing phase diagram calculation commercial package and other thermodynamic data for Mg alloys. The calculated phase diagrams were compared with the DSC results for the alloys of Mg-3wt%Al-3wt%Sn. The solidification and precipitation process of Mg-3wt%Al-Xwt%Sn were analyzed. The detailed comparison strongly supports the reliability of the selected thermodynamic description based on the results of thermodynamic calculation. It is clarified that when the Mg-Al-Sn alloy ends its solidification and cools down continuously, the phase Mg2Sn precipitated first from solid solution of magnesium, and then the Mg17Al12 phase precipitated at relative lower temperature. This is shown that the calculation phase diagram method considerably reduces the effort of alloy design and that the reliability of the results is high.

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