Plasma wakefield acceleration. Why is plasma the perfect transformer?

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Discussion Overview

The discussion centers around plasma wakefield acceleration, specifically exploring why plasma is considered an efficient transformer in this context. Participants seek clarification on the mechanisms involved and the comparative efficiency of plasma versus other acceleration methods.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants note that plasma has a high density of free charges, which enables the generation of intense electric fields.
  • Others suggest that while superconducting cavities may be more efficient in terms of energy, their field strength is limited compared to plasma acceleration, which can reach GeV/cm levels.
  • There is mention of two primary methods for plasma wakefield excitation: lasers and electron beams, with a reference to proton beams being tested as well.
  • One participant highlights recent advancements in achieving quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV, suggesting potential applications in medical and industrial fields, though noting current limitations for particle colliders.
  • A request for diagrams or schematics of plasma wakefield accelerators indicates a need for visual aids to better understand the concepts discussed.
  • Another participant questions how the acceleration process can be continuous, acknowledging the initial acceleration but seeking further explanation on sustained acceleration.

Areas of Agreement / Disagreement

Participants express various viewpoints on the efficiency and mechanisms of plasma wakefield acceleration, with no consensus reached on specific explanations or the best methods for understanding the topic.

Contextual Notes

Some discussions involve assumptions about prior knowledge of electrodynamics and induction, which may affect the clarity of explanations provided. There are also references to ongoing research and developments that may not be fully resolved.

Superposed_Cat
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Hi all, I recently read the wiki article on Plasma wakefield acceleration and it states that plasma is "The most efficient transformer known" but does no explain how (or maybe it does electrodynamics and induction are not my strong suit) and when I google it the only things that come up are cartoon referances. could someone please explain? Thanks in advance:)
 
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Plasma has a high density of free charges. This allows to get very intense electric fields.
I guess in terms of efficiency, superconducting cavities are better, but their field strength is more limited (currently ~35 MeV/m, while plasma acceleration is of the order of GeV/cm).
 
Superposed_Cat said:
Hi all, I recently read the wiki article on Plasma wakefield acceleration and it states that plasma is "The most efficient transformer known" but does no explain how (or maybe it does electrodynamics and induction are not my strong suit) and when I google it the only things that come up are cartoon referances. could someone please explain? Thanks in advance:)

Plasma Wakefield comes in two different favors: excitation by lasers and by electron beam.

Here are links on laser plasma wakefields:

http://www.rsc.org/chemistryworld/News/2006/December/06120602.asp

http://cerncourier.com/cws/article/cern/29728

Info on electron plasma Wakefield:

http://arxiv.org/abs/1308.1145

Zz.
 
ZapperZ said:
Plasma Wakefield comes in two different favors: excitation by lasers and by electron beam.
Proton beams are tested, too.

Here is some recent progress on the energy spread issue: Quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV

They are probably nice for medical and industrial applications, for particle colliders the beam is not narrow enough. (at least at the moment).
 
Thanks guys. Does anyone have a link to a diagram or schematic of a hypothetical plasma w/f accelerator for me? I am having trouble understanding the whole thing works.
Every page I look at is either too complex or so simple it omits vital info. Thanks if it's not too much
 
How does it CONTINUALLY accelerate the particles. I get how it gives them an initial massive kick.
 

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