Parametric Study of the Performance of an Electrostatic Analyzer With an Hemispheric Field-of-View Based on the Donut Topology

IF 2.6 2区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Journal of Geophysical Research: Space Physics Pub Date : 2025-03-19 DOI:10.1029/2024JA033367

Gwendal Hénaff, Matthieu Berthomier

{"title":"Parametric Study of the Performance of an Electrostatic Analyzer With an Hemispheric Field-of-View Based on the Donut Topology","authors":"Gwendal Hénaff, Matthieu Berthomier","doi":"10.1029/2024JA033367","DOIUrl":null,"url":null,"abstract":"<p>We carried out a parametric study of the optical performance of an electrostatic analyzer based on the donut topology. The instantaneous hemispheric field-of-view of the optics eliminates the need of electrostatic deflectors, which are usually added to the energy analyzer in other designs to cover such a wide field-of-view. Parametrization of the donut topology and the use of parallel computing have enabled a wide parametric study of the instrument's performance as a function of the angle resolution of the instrument. We have identified a limited number of geometric parameters, including the outer radius of the detection system, which determine the geometric factor and energy resolution of the instrument for a given angular resolution. The average geometric factor per pixel of this 3D plasma camera varies in the range <span></span><math>\n <semantics>\n <mrow>\n <mn>4</mn>\n <mo>⋅</mo>\n <mn>1</mn>\n <msup>\n <mn>0</mn>\n <mrow>\n <mo>−</mo>\n <mn>4</mn>\n </mrow>\n </msup>\n <mspace></mspace>\n <mo>−</mo>\n <mspace></mspace>\n <mn>3</mn>\n <mo>⋅</mo>\n <mn>1</mn>\n <msup>\n <mn>0</mn>\n <mrow>\n <mo>−</mo>\n <mn>3</mn>\n </mrow>\n </msup>\n <mi>c</mi>\n <msup>\n <mi>m</mi>\n <mn>2</mn>\n </msup>\n <mo>.</mo>\n <mi>s</mi>\n <mi>r</mi>\n <mo>.</mo>\n <mi>e</mi>\n <mi>V</mi>\n <mo>/</mo>\n <mi>e</mi>\n <mi>V</mi>\n </mrow>\n <annotation> $4\\cdot 1{0}^{-4}\\ -\\ 3\\cdot 1{0}^{-3}\\mathrm{c}{\\mathrm{m}}^{2}.sr.eV/eV$</annotation>\n </semantics></math> with an energy resolution between 9% and 14% for an energy limit of 20 keV. Our results suggest that a wide range of space missions could benefit from this new instrument concept. A low-angular-resolution version of the instrument could be installed on a nano-satellite platform, for example, for space weather monitoring on low-Earth orbit. For space missions requiring high-angular-resolution measurements, a high-temporal-resolution plasma camera would be able to provide the detailed distribution function of charged particles on larger platforms.</p>","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":"130 3","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JA033367","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Space Physics","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JA033367","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

We carried out a parametric study of the optical performance of an electrostatic analyzer based on the donut topology. The instantaneous hemispheric field-of-view of the optics eliminates the need of electrostatic deflectors, which are usually added to the energy analyzer in other designs to cover such a wide field-of-view. Parametrization of the donut topology and the use of parallel computing have enabled a wide parametric study of the instrument's performance as a function of the angle resolution of the instrument. We have identified a limited number of geometric parameters, including the outer radius of the detection system, which determine the geometric factor and energy resolution of the instrument for a given angular resolution. The average geometric factor per pixel of this 3D plasma camera varies in the range $4 \cdot 1 0^{- 4} - 3 \cdot 1 0^{- 3} c m^{2} . s r . e V / e V$ with an energy resolution between 9% and 14% for an energy limit of 20 keV. Our results suggest that a wide range of space missions could benefit from this new instrument concept. A low-angular-resolution version of the instrument could be installed on a nano-satellite platform, for example, for space weather monitoring on low-Earth orbit. For space missions requiring high-angular-resolution measurements, a high-temporal-resolution plasma camera would be able to provide the detailed distribution function of charged particles on larger platforms.