Dryson,dryson":2d9b719f said:I was reading in another post that heat was an issue...
You don't seem to be devoting much time to researching the operating principles of the Vasimr concept. Yes, heat is an issue - and heat is a necessary component of the high efficiency (Isp) of the Vasimr. Please study the article on the Ad Astra Rocket Company's Vasimr VX-200 prototype which can be found here:
Since our experience with you to date is that you either wont read this article , or you wont be able to understand it, I'll provide the pertinent section here:
I've put the most important point in bold letters. Vasimr produces a very high temperature plasma exhaust in order to produce higher fuel efficiency (essentially, Isp). A cooler exhaust will produce a less "fuel efficient" propulsion system.The Technology
VASIMR® works with plasma, a very hot gas, at temperatures close to the interior of the Sun. Plasmas are electrically charged fluids that can be heated to extreme temperatures by radio waves and controlled and guided by strong magnetic fields. The magnetic field also insulates any nearby structure, so temperatures well beyond the melting point of materials can be achieved and the resulting plasma can be harnessed to produce propulsion. In rocket propulsion, the higher the temperature of the exhaust gases, the higher their velocity and hence the higher their fuel efficiency. Plasma rockets feature exhaust velocities far above those achievable by their chemical cousins, so their fuel consumption is extremely low.
PLEASE RESEARCH HOW THESE THINGS WORK BEFORE MAKING SUGGESTIONS ON HOW TO MAKE THEM WORK BETTER!