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Related Concept Videos

Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Updated: Mar 28, 2026

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A versatile retarding potential analyzer for nano-satellite platforms.

L Fanelli1, S Noel1, G D Earle1

  • 1Virginia Tech, Blacksburg, Virginia 24061, USA.

The Review of Scientific Instruments
|January 3, 2016
PubMed
Summary
This summary is machine-generated.

A new retarding potential analyzer (RPA) designed for CubeSats offers high performance in a small package. This instrument measures key ionospheric plasma parameters, enabling advanced space science missions on limited platforms.

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Area of Science:

  • Space Science and Engineering
  • Plasma Physics
  • Satellite Instrumentation

Background:

  • CubeSats are increasingly used for space science due to their low cost and small size.
  • Traditional plasma instruments are often too large, heavy, or power-hungry for CubeSat platforms.
  • There is a need for miniaturized instruments capable of robust plasma measurements.

Purpose of the Study:

  • To present the design of the first retarding potential analyzer (RPA) specifically developed for resource-limited CubeSat missions.
  • To demonstrate that CubeSat-compatible instruments can achieve performance comparable to larger, more established platforms.
  • To detail the engineering and operational aspects of this novel RPA.

Main Methods:

  • Detailed mechanical and electrical design of the RPA for CubeSat integration.
  • Development of specific operating modes, command structure, and data handling protocols.
  • Validation of instrument performance using laboratory testing with an ion source in a vacuum chamber.

Main Results:

  • The RPA meets CubeSat size, mass, and power constraints.
  • Achieved performance specifications are comparable to those of RPAs on larger spacecraft.
  • The instrument successfully measures ion density, temperature, and ram velocity, with ion composition estimation capabilities.

Conclusions:

  • The developed RPA is suitable for deployment on resource-limited CubeSat platforms.
  • This miniaturized instrument enables advanced in-situ plasma measurements for space science.
  • The design validates the feasibility of high-performance plasma instruments for nano-satellites.