Is it possible to put multiple accelerator grids in an ion engine?

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Discussion Overview

The discussion revolves around the feasibility of incorporating multiple accelerator grids in an ion engine, exploring the potential benefits such as increased exhaust velocity and any associated disadvantages. The conversation touches on theoretical implications and practical considerations related to ion propulsion technology.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question whether multiple accelerator grids could enhance exhaust velocity in an ion engine, suggesting potential benefits.
  • One participant proposes the idea of using two smaller grids instead of one larger grid, prompting further inquiry into the rationale behind grid configuration.
  • A later reply references a NASA paper that suggests using multiple grids may not be effective for xenon ion engines, indicating that the grid disassociates ions from the circuit, complicating the use of additional grids.
  • Another participant argues for the removal of intermediary grids, suggesting that eliminating obstacles could simplify the engine design and improve ion flow.
  • One participant draws parallels to historical technologies, mentioning that additional grids in vacuum tubes often inhibited flow, which may have implications for ion engine design.
  • It is noted that the original poster has not engaged further in the discussion.

Areas of Agreement / Disagreement

Participants express differing views on the utility and effectiveness of multiple accelerator grids in ion engines. There is no consensus on whether such a configuration would be beneficial or detrimental, and the discussion remains unresolved.

Contextual Notes

Limitations include the dependence on specific engine designs, the assumptions about ion behavior in relation to grid configurations, and the unresolved implications of historical technologies on current designs.

RocketAstro
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Is it possible to put multiple accelerator grid in ion engine instead of one? So we will get higher exhaust velocity and benefit for us right? or is there any disadvantages?
 
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Why two small ones instead of one bigger one?
 
RocketAstro said:
Is it possible to put multiple accelerator grid in ion engine instead of one? So we will get higher exhaust velocity and benefit for us right? or is there any disadvantages?
Here is a paper from NASA that analyzed ion wind propulsion.
https://ntrs.nasa.gov/citations/20100000021
TLDR; not really.
if you are talking about a xenon ion engine then no. The grid disassociates the ion from the ‘circuit’ so it can shoot out the nozzle. I believe you would have to re energize the particle to even make a second accelerator grid work. So unfortunate no.
 
See it from the other direction: What's the point of adding grids between the ion source and the last grid? Just remove them, you remove obstacles for the ions and simplify the engine.
 
Old style hot-cathode vacuum tubes and cathode ray tubes (CRT) often added additional grids between the anode and cathodes for various purposes. Even grids that increased anode emissions often inhibited flow; i.e., increased travel time between anodes and cathodes.

While not an ion reaction engine, vacuum tube grid technology has extensive documentation and possible application.
 
It's probably worth pointing out that the OP posted and left.
 

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