ARLO / ACTIVE SHIELDING / CONCEPT RESEARCH

Bend a trajectory. Account for what arrives.

Understand magnetic rigidity, particle energy, field direction and why a magnetic field is not a universal barrier.

Explore the research ↓
Concept visualization · not a field solution or built hardware
Current evidenceLiterature + analytical modelNo measured ARLO shielding benefit
01

What a magnet changes

The magnetic part of the Lorentz force is q(v × B). It acts perpendicular to particle velocity: a static magnetic field bends a trajectory without directly removing kinetic energy. Neutral particles and photons do not experience this force. Particles traveling parallel to the local field initially experience no magnetic deflection.

02

Energy changes the challenge

For a proton, magnetic rigidity Bρ is momentum divided by charge. A 100 MeV proton has rigidity about 1.483 tesla-metres; a 1 GeV proton about 5.657 tesla-metres. At a uniform transverse field of 1 T, those correspond to curvature radii of 1.483 m and 5.657 m. These are single-particle calculations, not shielding requirements or dose reductions.

03

A field is not a closed wall

Real coils leave a three-dimensional distribution with different directions, gradients and access paths. Some trajectories can be focused toward hardware or occupied volumes. A trajectory that misses one detector may enter elsewhere. Score particles and deposited energy throughout the habitat, not only at a central point.

04

Keep the full momentum boundary

Deflecting external particles transfers momentum to the magnetic system and its supports. This is consistent with momentum conservation. It does not establish an internal-only propulsion mechanism, and a radiation shield is not automatically a useful thruster.

Try the proton calculator ↗

Research foundations

External work informs the study; it does not validate ARLO. Review date: 24 October 2026. Source access depth is stated below.

  1. NASA MAARSS engineering study, 2019 ↗

    Architecture, structural loads, quench protection and cooling; report summary reviewed.

  2. CREW HaT, Desiati & D’Onghia, 2022 ↗

    Preliminary magnetic habitat concept; abstract reviewed, not flight validation.

  3. Hesse-Withbroe & Arquilla, 2025 ↗

    Modeling preprint; revised strong-field performance. Abstract reviewed.

  4. NASA LEO station radiation environment, 2024 ↗

    Orbit-specific environment reference; presentation.

  5. NASA thermal-control overview ↗

    Engineering context for coatings, heat rejection and environment.

  6. ESA spacecraft impact shielding ↗

    Physical debris protection remains a separate system.

  7. NASA spacecraft power systems ↗

    Solar generation, eclipse storage and end-of-life considerations; overview reviewed.

FOLLOW THE DESIGN

Explore the next question.

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Help test the protection concept.

We are defining a research scope for radiation transport, superconducting engineering and optical-material testing. No shield is offered for sale or operational use.

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