Could a particle beam reach the surface of the moon?

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Discussion Overview

The discussion centers around the feasibility of directing a particle beam (such as protons, gold ions, or electrons) to the surface of the moon using current technology. Participants explore the implications of atmospheric interference, beam focusing, and the potential applications or motivations for such an endeavor.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that a particle beam sent from space could reach the moon, while a beam from the surface would be stopped by the atmosphere.
  • There is uncertainty about the term "scenter" used in the original post, with some participants interpreting it as "scatter" and others questioning its relevance.
  • One participant argues that increasing the beam size and power could compensate for atmospheric losses, allowing particles to reach the moon's surface.
  • Another participant notes that particle beams behave differently from lasers, stating that at low energy, they are completely stopped by the atmosphere, and at higher energies, they may create showers that complicate focusing.
  • Concerns are raised about the ability to focus a particle beam sufficiently to induce relevant heating on the moon's surface.
  • There is a contention regarding the feasibility of using the Large Hadron Collider (LHC) directed at the moon, with differing views on whether it could produce any significant effect.
  • One participant calculates that the beam's opening angle would result in a large illuminated area on the moon, suggesting that the energy delivered would be minimal compared to sunlight.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the feasibility and implications of using particle beams directed at the moon. The discussion remains unresolved, with no consensus on the practicality or effectiveness of such an approach.

Contextual Notes

Participants highlight limitations related to atmospheric interference, beam focusing capabilities, and the energy dynamics of particle beams versus lasers. There are also unresolved questions about the motivations for targeting the moon with particle beams.

bauhaus
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Could a particle(proton, gold ion, electron) beam reach the surface of the moon, given current technology? Would the beam diffuse too much too scenter the regolith? Or would the beam have to be focused or continually refocused in order to achieve that? If so why can they do it with laser (photon beams) into a reflector but not be able to focus a particle beam from Earth onto the lunar surface? Thank you for any insight.
 
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The atmosphere would stop every reasonable beam sent from the surface, a particle beam sent from space could easily reach the moon. But where is the point? You cannot do lunar ranging with particle beams, there is no suitable mirror, amongst other issues.

What do you mean with "scenter the regolith"?
 
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Why would anyone want to do that? Ans what is "scenter"?
 
I assume he means "scatter the regolith", although I too am puzzled as to why anyone would want to bother.
 
Thank you so much for your response, I found it very helpful. :-)

Sinter as in sintering, my bad. "The atmosphere would stop every reasonable beam sent from the surface, a particle beam sent from space could easily reach the moon." Do diffusion/difraction is not an issue. You must just increase the beam size and power to make up for the loss of particle collisions with atmospheric particles(gases). So scaling up at some point so many of them will get through that some will hit the surface of the moon. If you turned the LHC onto the direction of the moon you could take out a "jade rabbit."
 
bauhaus said:
You must just increase the beam size and power to make up for the loss of particle collisions with atmospheric particles(gases).
Particle beams are not like lasers. At low energy they just get stopped completely. At sufficient energy they start showers. If the particles are high-energetic enough some shower products (but not the original particles) leave the atmosphere, but then every attempt of collimating them is completely pointless.

Even ignoring the atmosphere, there is no realistic way to focus a beam well enough to induce any relevant heating at the moon.
bauhaus said:
If you turned the LHC onto the direction of the moon you could take out a "jade rabbit."
No you could not. You could not even induce any notable signal.
 
bauhaus said:
If you turned the LHC onto the direction of the moon you could take out a "jade rabbit."

No, you couldn't. The beam would have an opening angle of at least .05 degrees - maybe more - and as such would illuminate a spot about 25 miles in radius. That will put 5% of the energy received in a second's worth of sunlight onto the illuminated surface.
 

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