scholarly journals ZONE FOR COLLECTING THE IONS OF A GIVEN MASS RANGE IN THE PLASMA FILTER OF MASSES

2020 ◽  
pp. 185-190
Author(s):  
V.V. Katrechko ◽  
V.B. Yuferov ◽  
V.O. Ilichova ◽  
A.S. Svichkar ◽  
S.N. Khizhnyak
Keyword(s):  
Cyclotron Frequency ◽  
Initial Conditions ◽  
Radial Electric Field ◽  
Plasma Source ◽  
Mass Range ◽  
Molecular Ions ◽  
Variable Component ◽  
Mass Filter ◽  
Ion Motion ◽  
Ion Trajectory

The trajectories of motion for atomic and molecular ions of a given mass range (M = 232...277) in the plasma mass filter, which is currently being developed, are calculated. The influence of the initial conditions (energy, angle, radius) on the ion trajectory to determine the dimensions of the collector for actinides, the so-called “pocket”, is studied. It is shown that the variable component of the radial electric field, tuned to a frequency equal to half the ion cyclotron frequency for M = 238 allows target ions to enter the “pocket”. An analysis of the calculations showed that there are limitations on energy, angle, and radius related to the initial conditions for the ion motion, that must be taken into account when creating the plasma source for the plasma mass filter.

scholarly journals SPATIAL SEPARATION OF THE IONES OF A GIVEN MASS RANGE IN THE DEMO-IMITATION SEPARATOR AT THE FIRST TURN OF IONIC TRAJECTORY

2021 ◽  
pp. 118-121
Author(s):  
V.V. Katrechko ◽  
V.B. Yuferov ◽  
V.O. Ilichova ◽  
S.N. Khizhnyak
Keyword(s):  
Spent Nuclear Fuel ◽  
Spatial Separation ◽  
Radial Electric Field ◽  
Mass Range ◽  
Purex Process ◽  
Variable Component ◽  
Mass Filter ◽  
Spent Nuclear Fuel Reprocessing ◽  
Ion Trajectory ◽  
Fuel Reprocessing

Plasma methods, where only electricity is required, are an alternative to the PUREX process used in industry for spent nuclear fuel reprocessing. It is considered the possibility of filtering out the target ions (М = 232…277) to the collector at the first turn of the ion trajectory in the plasma mass filter, which is currently being developed, that is achieved by specifying certain parameters (amplitude and frequency) for a variable component of a radial electric field. This approach significantly reduces the thermal load onto deposition surface of target ions.

scholarly journals Призменный масс-спектрометр для изотопного анализа водородно-гелиевых смесей

2018 ◽  
Vol 44 (14) ◽  
pp. 94
Author(s):  
Л.Н. Галль ◽  
Е.М. Якушев ◽  
Л.М. Назаренко ◽  
А.С. Антонов ◽  
А.А. Семенов ◽  
...  
Keyword(s):  
Ion Beam ◽  
Mass Range ◽  
High Dispersion ◽  
High Brightness ◽  
Ion Trajectory ◽  
Ion Optics ◽  
Ion Energies ◽  
Trajectory Length ◽  
Original Scheme ◽  
Magnetic Mass

AbstractAn original scheme of a special magnetic mass-spectrometer for isotope measurements in a mass range of hydrogen–helium mixtures and their main impurities is proposed. The ion optics system contains a two-dimensional magnetic prism supplemented with two identical cylindrical electrostatic capacitors matched so that the system operates in the regime of complete triple focusing of the ion beam in two orthogonal directions and with respect to ion energies. The system ensures high dispersion and allows the mass resolution (no less than 3500) required for analysis at high brightness and a central ion trajectory length on the order of 1 m.

scholarly journals Dust Experiment for a Rendezvous Cometary Mission

1980 ◽  
Vol 90 ◽  
pp. 273-273
Author(s):  
B.-K. Dalmann ◽  
D. Bahr ◽  
H. Fechtig ◽  
J. Kissel
Keyword(s):  
Mass Range ◽  
Mass Region ◽  
Dust Particles ◽  
Simulation Studies ◽  
Quadrupole Mass ◽  
Mass Filter ◽  
Oxygen Ions ◽  
Secondary Ions ◽  
Primary Ions ◽  
Secondary Ion

During a Rendezvous-type cometary mission it will be possible to collect dust particles on exposed surfaces. A secondary-ion-mass-spectrometer is proposed for the subsequent chemical investigation of such dust collections. An ion gun shoots inert gas or oxygen-ions onto the sample. The energy of these primary ions can be chosen between 1 and 5 keV. The positive and negative secondary ions emitted from the dust surfaces are then analysed with a quadrupole mass filter. The mass range of the instrument will be 1-150 amu. The sensor is able to measure (a) nearly all elements in this mass region, (b) molecules and organic components present in the dust, (c) isotopic ratios of interesting elements. Results of a first series of simulation studies are reported.

scholarly journals Chemo-dynamical evolution of dwarf galaxies: from flat to cuspy dark matter density profiles

2009 ◽  
Vol 5 (H15) ◽  
pp. 78-78
Author(s):  
S. Pasetto ◽  
E. K. Grebel ◽  
P. Berczik ◽  
R. Spurzem
Keyword(s):  
Dark Matter ◽  
Dwarf Galaxies ◽  
Initial Conditions ◽  
Smooth Particle Hydrodynamic ◽  
Dynamical Evolution ◽  
Mass Range ◽  
Density Profiles ◽  
Hydrodynamic Approach ◽  
The Stability ◽  
Evolution With Time

A model of an isolated dwarf spherical galaxy (dSph) is considered in its chemo-dynamical evolution with time. The system is composed by 3 γ-model density profiles: gas, stellar and dark matter, and it is realized in a spherical symmetric equilibrium configuration. The total masses used in our simulations are covering the dwarf galaxies mass range. The stability of this configuration is first tested for the system evolving under the gravity effect alone and then evolved taking into account for the most relevant stellar astrophysical processes implemented with a Smooth Particle Hydrodynamic approach. The two different kinds of evolution are compared. The dark matter evolves naturally from a centrally cuspy density profile into a flatter one within a timescale of several Gyr. The effect manifests itself naturally, without any tuned initial conditions, as soon as few standard criteria on star formation are assumedand the SN feedback on the ISM has been adopted the prescription in (Cioffi & Shull 1991) and (Bradamante et al. 1998). This result is expected to be a possible natural explanation for the discrepancy between observations that want flatter dark matter profiles (e.g. de Block 2005), and N-body simulations that predict cuspy dark matter profiles (Navarro et al. 1997). Chemical considerations are presented as a tool to follow with observational parameters the theory predictions.

Identification of Rubber Additives by Field Desorption and Fast Atom Bombardment Mass Spectroscopy

1984 ◽  
Vol 57 (5) ◽  
pp. 1013-1022 ◽  
Author(s):  
Robert P. Lattimer ◽  
Robert E. Harris ◽  
Doyle B. Ross ◽  
Hugh E. Diem
Keyword(s):  
Molecular Weight ◽  
Mass Range ◽  
Molecular Ions ◽  
Organic Additives ◽  
Compound Identification ◽  
Mass Spectral ◽  
Rubber Compounds ◽  
General Answer ◽  
Background Ions ◽  
Normal Background

Abstract From the results presented here, it is clear that FD-MS and FAB-MS are very effective analytical methods for the identification of organic additives in extracts from rubber compounds. In the examples above, the molecular weight information provided by FD and FAB provided a nice complement to the IR data. In cases where IR could give only a general answer (i.e., a compound class), the mass spectral data provided a very specific compound identification. It is encouraging that all the samples examined gave useful spectra by both FD and FAB analysis. In most cases, the same information was obtained by both techniques. Certain compounds, however, were observed by FD but not by FAB (wax, oil, isocyanurate antioxidant). While FD provided only molecular weight information, FAB also provided fragmentation to aid in the confirmation of component assignments. Both the FD and FAB mass spectra were fairly complex for most of the extracts, but for different reasons. In FD, oil and wax oligomers gave many molecular ions over a wide mass range. FAB spectra, on the other hand, were somewhat cluttered due to the normal background ions produced by the sputtering process. With both techniques, however, the various components in some fairly complex mixtures were readily identified.

scholarly journals A novel rocket borne ion mass spectrometer with large mass range: instrument description and first flight results

2020 ◽  
Author(s):  
Joan Stude ◽  
Heinfried Aufmhoff ◽  
Hans Schlager ◽  
Markus Rapp ◽  
Frank Arnold ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Negative Ions ◽  
Mass Range ◽  
Large Mass ◽  
Molecular Ions ◽  
Negative Ion ◽  
Cluster Ions ◽  
The Arctic ◽  
Atmospheric Species ◽  
Smoke Particles

Abstract. We present a novel rocket borne ion mass spectrometer ROMARA (ROcket borne MAss spectrometer for Research in the Atmosphere) for measurements of atmospheric positive and negative ions (atomic, molecular and cluster ions) and positively and negatively charged meteor smoke particles. Our ROMARA instrument has, compared to previous rocket borne ion mass spectrometers, a markedly larger mass range of up to m/z 2000 and a larger sensitivity, particularly for meteor smoke particle detection. Mayor objectives of this first ROMARA flight included: a functional test of the ROMARA instrument, measurements between 55 km and 121 km in the mass range of atmospheric positive and negative ions, a first attempt to conduct mass spectrometric measurements in the mass range of meteor smoke particles with mass to charge ratios up to m/z 2000, and measurements inside a polar mesospheric winter echo layer as detected by ground based radar. Our ROMARA measurements took place on the Arctic island of Andøya/Norway around noon in April 2018 and represented an integral part of the PMWE rocket campaign. During the rocket flight, ROMARA was operated in a measurement mode, offering maximum sensitivity and the ability to qualitatively detect total ion signatures even beyond its mass resolving mass range. On this first ROMARA flight we were able to meet all of our objectives. We detected atmospheric species including positive atomic, molecular and cluster ions along with negative molecular ions up to about m/z 100. Above m/z 2000, ROMARA measured strong negative ion signatures, which are likely due to negatively charged meteor smoke particles.

scholarly journals Modeling of ion dynamics in the inner geospace during enhanced magnetospheric activity

2016 ◽  
Vol 34 (2) ◽  
pp. 171-185
Author(s):  
C. Tsironis ◽  
A. Anastasiadis ◽  
C. Katsavrias ◽  
I. A. Daglis
Keyword(s):  
Initial Conditions ◽  
Ion Dynamics ◽  
Particle Tracing ◽  
Kinematic Data ◽  
Ion Motion ◽  
Test Particles ◽  
Magnetospheric Currents ◽  
Solar Eruptions ◽  
Ion Species ◽  
Current Systems

Abstract. We investigate the effect of magnetic disturbances on the ring current buildup and the dynamics of the current systems in the inner geospace by means of numerical simulations of ion orbits during enhanced magnetospheric activity. For this purpose, we developed a particle-tracing model that solves for the ion motion in a dynamic geomagnetic field and an electric field due to convection, corotation and Faraday induction and which mimics reconfigurations typical to such events. The kinematic data of the test particles is used for analyzing the dependence of the system on the initial conditions, as well as for mapping the different ion species to the magnetospheric currents. Furthermore, an estimation of Dst is given in terms of the ensemble-averaged ring and tail currents. The presented model may serve as a tool in a Sun-to-Earth modeling chain of major solar eruptions, providing an estimation of the inner geospace response.

scholarly journals Cosmological baryon transfer in the simba simulations

2019 ◽  
Vol 491 (4) ◽  
pp. 6102-6119 ◽  
Author(s):  
Josh Borrow ◽  
Daniel Anglés-Alcázar ◽  
Romeel Davé
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Large Scale ◽  
Initial Conditions ◽  
Mass Range ◽  
Gas Content ◽  
Final State ◽  
Cosmological Simulations ◽  
Baryon Transfer ◽  
Matter Component

ABSTRACT We present a framework for characterizing the large-scale movement of baryons relative to dark matter in cosmological simulations, requiring only the initial conditions and final state of the simulation. This is performed using the spread metric that quantifies the distance in the final conditions between initially neighbouring particles, and by analysing the baryonic content of final haloes relative to that of the initial Lagrangian regions (LRs) defined by their dark matter component. Applying this framework to the simba cosmological simulations, we show that 40 per cent (10 per cent) of cosmological baryons have moved $\gt 1\, h^{-1}\, {\rm Mpc}{}$ ($3\, h^{-1}\, {\rm Mpc}{}$) by z = 0, primarily due to entrainment of gas by jets powered by an active galactic nucleus, with baryons moving up to $12\, h^{-1}\, {\rm Mpc}{}$ away in extreme cases. Baryons decouple from the dynamics of the dark matter component due to hydrodynamic forces, radiative cooling, and feedback processes. As a result, only 60 per cent of the gas content in a given halo at z = 0 originates from its LR, roughly independent of halo mass. A typical halo in the mass range Mvir = 1012–1013 M⊙ only retains 20 per cent of the gas originally contained in its LR. We show that up to 20 per cent of the gas content in a typical Milky Way-mass halo may originate in the region defined by the dark matter of another halo. This inter-Lagrangian baryon transfer may have important implications for the origin of gas and metals in the circumgalactic medium of galaxies, as well as for semi-analytic models of galaxy formation and ‘zoom-in’ simulations.

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