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New high-resolution electrostatic ion mass analyzer using time of flight : Eighth topical conference on high−temperature plasma diagnostics (1990)

Hamilton, D. C. ; Gloeckler, G. ; Ipavich, F. M. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 3104-3106

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: We have developed a high-resolution mass analyzer that utilizes a measurement of an ion's time of flight (TOF) in an electrostatic field that is configured to produce a harmonic potential. The TOF corresponds to one-half period of a harmonic oscillator and is independent of ion energy, in analogy to the amplitude independence of a harmonic oscillator's period, and is proportional to the square root of the ion's mass per charge ratio. The TOF is determined from a start pulse from secondary electrons produced when the ion passes through a thin carbon foil (1–3 μg/cm2) at the entrance of the TOF region and a stop pulse from the ion striking a microchannel plate (MCP) upon exiting the region. The energy independence of the TOF implies there is no degradation of resolution from energy straggling in the foil. We have achieved a mass resolution M/ΔM (FWHM) of greater than 100 with a laboratory prototype. Three versions of this analyzer for solar wind measurements are included on upcoming space missions and will be flown on the GGS/WIND spacecraft, the SOHO spacecraft, and the ACE spacecraft.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1141695

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The solar WIND and suprathermal ion composition investigation on the WIND spacecraft (1995)

Gloeckler, G. ; Balsiger, H. ; Bürgi, A. ; [et al.]

Springer

Space science reviews 71 (1995), S. 79-124

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ISSN: 1572-9672

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The Solar Wind and Suprathermal Ion Composition Experiment (SMS) on WIND is designed to determine uniquely the elemental, isotopic, and ionic-charge composition of the solar wind, the temperatures and mean speeds of all major solar-wind ions, from H through Fe, at solar wind speeds ranging from 175 kms−1 (protons) to 1280 kms−1 (Fe+8), and the composition, charge states as well as the 3-dimensional distribution functions of suprathermal ions, including interstellar pick-up He+, of energies up to 230 keV/e. The experiment consists of three instruments with a common Data Processing Unit. Each of the three instruments uses electrostatic analysis followed by a time-of-flight and, as required, an energy measurement. The observations made by SMS will make valuable contributions to the ISTP objectives by providing information regarding the composition and energy distribution of matter entering the magnetosphere. In addition SMS results will have an impact on many areas of solar and heliospheric physics, in particular providing important and unique information on: (i) conditions and processes in the region of the corona where the solar wind is accelerated; (ii) the location of the source regions of the solar wind in the corona; (iii) coronal heating processes; (iv) the extent and causes of variations in the composition of the solar atmosphere; (v) plasma processes in the solar wind; (vi) the acceleration of particles in the solar wind; and (vii) the physics of the pick-up process of interstellar He as well as lunar particles in the solar wind, and the isotopic composition of interstellar helium.