scholarly journals Holistic numerical calibration of the iMESA electrostatic analyzer

2021 ◽  
Vol 92 (2) ◽  
pp. 023303
Author(s):  
C. L. Enloe ◽  
G. R. Wilson ◽  
C. A. Maldonado ◽  
M. G. McHarg
Keyword(s):  
Electrostatic Analyzer

The analyzer constant of top hat electrostatic analyzer: comparison between theory and simulations

2018 ◽  
Vol 13 (12) ◽  
pp. P12027-P12027
Author(s):  
C. Li ◽  
Y. Wang ◽  
H. Zhang ◽  
S. Li ◽  
Z. Liu ◽  
...  
Keyword(s):  
Electrostatic Analyzer

scholarly journals Statistical Uncertainties of Space Plasma Properties Described by Kappa Distributions

Entropy ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 541
Author(s):  
Georgios Nicolaou ◽  
George Livadiotis
Keyword(s):  
Accurate Determination ◽  
Space Plasma ◽  
High Energy ◽  
Distribution Functions ◽  
Kappa Distribution ◽  
Plasma Properties ◽  
Electrostatic Analyzer ◽  
Bulk Parameters ◽  
Plasma Bulk

The velocities of space plasma particles often follow kappa distribution functions, which have characteristic high energy tails. The tails of these distributions are associated with low particle flux and, therefore, it is challenging to precisely resolve them in plasma measurements. On the other hand, the accurate determination of kappa distribution functions within a broad range of energies is crucial for the understanding of physical mechanisms. Standard analyses of the plasma observations determine the plasma bulk parameters from the statistical moments of the underlined distribution. It is important, however, to also quantify the uncertainties of the derived plasma bulk parameters, which determine the confidence level of scientific conclusions. We investigate the determination of the plasma bulk parameters from observations by an ideal electrostatic analyzer. We derive simple formulas to estimate the statistical uncertainties of the calculated bulk parameters. We then use the forward modelling method to simulate plasma observations by a typical top-hat electrostatic analyzer. We analyze the simulated observations in order to derive the plasma bulk parameters and their uncertainties. Our simulations validate our simplified formulas. We further examine the statistical errors of the plasma bulk parameters for several shapes of the plasma velocity distribution function.

scholarly journals A laminated energetic electrostatic analyzer for 0–5 keV charged particles

2020 ◽  
Vol 91 (1) ◽  
pp. 013303
Author(s):  
C. A. Maldonado ◽  
Z. Eyler ◽  
B. Pierce ◽  
L. Matson ◽  
P. Neal ◽  
...  
Keyword(s):  
Charged Particles ◽  
Electrostatic Analyzer

AMS Measurement of 237Np at CIAE

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 294-301 ◽  
Author(s):  
Xianggao Wang ◽  
Shan Jiang ◽  
Ming He ◽  
Kejun Dong ◽  
Hongtao Chen ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Isotopic Ratio ◽  
Atomic Ratio ◽  
Molecular Ions ◽  
Nuclear Safeguards ◽  
Electrostatic Analyzer ◽  
Integral Neutron ◽  
Set Up ◽  
Oxide Sample ◽  
Integral Neutron Flux

237Np (≃2.14 × 106 yr half-life) is potentially applicable in studies on nuclear safeguards and radioactive waste migration. The atomic ratio of 237Np/U in nature is 10−12 or even lower, depending strongly on the integral neutron flux received by the material. As an ultra-sensitive technique, accelerator mass spectrometry (AMS) is the best for measuring ultratrace 237Np. By extracting negative molecular ions NpO– from the oxide sample using 238UO– and 208Pb16O2– pilot beams for the simulation of 237Np ion transport, identifying the interference isotopes by high-resolution dedicated injector, electrostatic analyzer, and time of flight (TOF) detector, a method for AMS measurement of 237Np was set up on the HI-13 accelerator at the China Institute of Atomic Energy (CIAE). A sensitivity of <10–11 has been achieved for the isotopic ratio 237Np/238U.

Comparison of a time-of-flight system with an electrostatic analyzer in low-energy ion scattering

1978 ◽  
Vol 149 (1-3) ◽  
pp. 591-594 ◽  
Author(s):  
T.M. Buck ◽  
G.H. Wheatley ◽  
G.L. Miller ◽  
D.A.H. Robinson ◽  
Y.-S. Chen
Keyword(s):  
Time Of Flight ◽  
Low Energy ◽  
Ion Scattering ◽  
Flight System ◽  
Electrostatic Analyzer ◽  
Low Energy Ion Scattering
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