Optimization of hemispherical electrostatic analyzer manufacturing with respect to resolution requirements

Jari Vilppola, Jyrki Keisala, Pekka Tanskanen, Heikki Huomo

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Electrostatic analyzers with different geometries have been used extensively in space plasma investigations. When the energy resolution requirements are such that ΔE/E≊10% the instrument is rather simple to design and to manufacture. However, when an energy resolution of ≊1% is required, the manufacturing costs increase rapidly. For analyzers with an energy resolution of ≊10% the calibration can also be used to correct for manufacturing errors when they appear. In this paper, it has been shown that to reach an energy resolution ΔE/E=(1.6±0.2)% using a hemispherical electrostatic analyzer with outer and inner radii 101.25 and 98.75 mm respectively and plate thickness 0.4 mm, an accuracy of 25 μm in the alignment of one hemisphere with respect to the other is sufficient. It is also shown that the effect on the energy resolution of an indentation of the surface of one of the conductors can be neglected as long as its depth is less than ≊100 μm. Larger indentations can easily be detected in the manufacturing process. For each case considered, the maximum permitted loss of transmitted particles with respect to the transmission of an ideal instrument has been defined as 10%. Similarly, it has been specified that the deviations in the distributions of entrance angles of transmitted particles shall be less than 0.1°.  
Original languageEnglish
Pages (from-to)2190 - 2194
Number of pages5
JournalReview of Scientific Instruments
Volume64
Issue number8
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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Electrostatics
analyzers
manufacturing
electrostatics
requirements
optimization
Indentation
indentation
energy
space plasmas
hemispheres
entrances
Calibration
Plasmas
conductors
alignment
Geometry
costs
deviation
radii

Cite this

Vilppola, Jari ; Keisala, Jyrki ; Tanskanen, Pekka ; Huomo, Heikki. / Optimization of hemispherical electrostatic analyzer manufacturing with respect to resolution requirements. In: Review of Scientific Instruments. 1993 ; Vol. 64, No. 8. pp. 2190 - 2194.
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abstract = "Electrostatic analyzers with different geometries have been used extensively in space plasma investigations. When the energy resolution requirements are such that ΔE/E≊10{\%} the instrument is rather simple to design and to manufacture. However, when an energy resolution of ≊1{\%} is required, the manufacturing costs increase rapidly. For analyzers with an energy resolution of ≊10{\%} the calibration can also be used to correct for manufacturing errors when they appear. In this paper, it has been shown that to reach an energy resolution ΔE/E=(1.6±0.2){\%} using a hemispherical electrostatic analyzer with outer and inner radii 101.25 and 98.75 mm respectively and plate thickness 0.4 mm, an accuracy of 25 μm in the alignment of one hemisphere with respect to the other is sufficient. It is also shown that the effect on the energy resolution of an indentation of the surface of one of the conductors can be neglected as long as its depth is less than ≊100 μm. Larger indentations can easily be detected in the manufacturing process. For each case considered, the maximum permitted loss of transmitted particles with respect to the transmission of an ideal instrument has been defined as 10{\%}. Similarly, it has been specified that the deviations in the distributions of entrance angles of transmitted particles shall be less than 0.1°.  ",
author = "Jari Vilppola and Jyrki Keisala and Pekka Tanskanen and Heikki Huomo",
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Optimization of hemispherical electrostatic analyzer manufacturing with respect to resolution requirements. / Vilppola, Jari; Keisala, Jyrki; Tanskanen, Pekka; Huomo, Heikki.

In: Review of Scientific Instruments, Vol. 64, No. 8, 1993, p. 2190 - 2194.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Optimization of hemispherical electrostatic analyzer manufacturing with respect to resolution requirements

AU - Vilppola, Jari

AU - Keisala, Jyrki

AU - Tanskanen, Pekka

AU - Huomo, Heikki

N1 - Project code: INS3204

PY - 1993

Y1 - 1993

N2 - Electrostatic analyzers with different geometries have been used extensively in space plasma investigations. When the energy resolution requirements are such that ΔE/E≊10% the instrument is rather simple to design and to manufacture. However, when an energy resolution of ≊1% is required, the manufacturing costs increase rapidly. For analyzers with an energy resolution of ≊10% the calibration can also be used to correct for manufacturing errors when they appear. In this paper, it has been shown that to reach an energy resolution ΔE/E=(1.6±0.2)% using a hemispherical electrostatic analyzer with outer and inner radii 101.25 and 98.75 mm respectively and plate thickness 0.4 mm, an accuracy of 25 μm in the alignment of one hemisphere with respect to the other is sufficient. It is also shown that the effect on the energy resolution of an indentation of the surface of one of the conductors can be neglected as long as its depth is less than ≊100 μm. Larger indentations can easily be detected in the manufacturing process. For each case considered, the maximum permitted loss of transmitted particles with respect to the transmission of an ideal instrument has been defined as 10%. Similarly, it has been specified that the deviations in the distributions of entrance angles of transmitted particles shall be less than 0.1°.  

AB - Electrostatic analyzers with different geometries have been used extensively in space plasma investigations. When the energy resolution requirements are such that ΔE/E≊10% the instrument is rather simple to design and to manufacture. However, when an energy resolution of ≊1% is required, the manufacturing costs increase rapidly. For analyzers with an energy resolution of ≊10% the calibration can also be used to correct for manufacturing errors when they appear. In this paper, it has been shown that to reach an energy resolution ΔE/E=(1.6±0.2)% using a hemispherical electrostatic analyzer with outer and inner radii 101.25 and 98.75 mm respectively and plate thickness 0.4 mm, an accuracy of 25 μm in the alignment of one hemisphere with respect to the other is sufficient. It is also shown that the effect on the energy resolution of an indentation of the surface of one of the conductors can be neglected as long as its depth is less than ≊100 μm. Larger indentations can easily be detected in the manufacturing process. For each case considered, the maximum permitted loss of transmitted particles with respect to the transmission of an ideal instrument has been defined as 10%. Similarly, it has been specified that the deviations in the distributions of entrance angles of transmitted particles shall be less than 0.1°.  

U2 - 10.1063/1.1143958

DO - 10.1063/1.1143958

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