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  1. M

    Transition from pressurised envoronment to vaccum environment

    Hi Armin11, I like the plasma solution as I am a plasma physisist. But I am also a practical guy so I think you are right the airlock without any air is the best solution. You suggest a gel to replace the air. I think this should be a gel inside a flexible but impervious outer surface so like an...
  2. M

    Knotted flux tube in a plasma

    Can you explain what type of flux you are talking about.
  3. M

    Transition from pressurised envoronment to vaccum environment

    Hi Armin11, The principle is the same. However creating a high pressure air jet only gets the energy upto a limited value. The air velocity at the exit of a jet engine is 500m/s. The velocity of a 1000eV beam is 2.5e5 m/s. As the energy goes as the velocity squared each molecule in a beam...
  4. M

    Transition from pressurised envoronment to vaccum environment

    astronaut goes through the plasma beam front and exits to side of beam sources. Also possible to have opening between two beam sources.
  5. M

    Transition from pressurised envoronment to vaccum environment

    Ok the astronaut would put on his suit and and seal the airlock before the plasma is switched on. The plasma will create ozone and other radicals that would harm him if he inhaled them. The plasma is on while the door is open, only a short time so that the power needed is small. 1kW for a few...
  6. M

    Transition from pressurised envoronment to vaccum environment

    I am a plasma physist so I decided to look at the idea of using a plasma window or more accurately a beam driven ion wind to keep the air from leaving the airlock. Just like the Star Trek idea. The system would work like this. An ion beam would be formed at the door of the airlock and directed...
  7. M

    Transition from pressurised envoronment to vaccum environment

    I am afraid the 30cc to 50cc idea only reduces the pressure from atmopsphere to about 400 milli-Torr. That is still high pressure not really an approximation to a vacuum. A vaccum pump needs to take it down at least 1:1000 to 1:100000. That means the plunger would be bigger than the ship.
  8. M

    Transition from pressurised envoronment to vaccum environment

    Use a vacuum pump on the space craft to evacuate the air in the airlock back into the craft before opening the doors. Simple engineering solution.
  9. M

    Transition from pressurised envoronment to vaccum environment

    Thought this thread might be interested in this - what happens to a body in a vacuum? That empty feeling, when everything sucks!
  10. M

    Generating magnetic field with Plasma

    The plasma does not generate a coherent magnetic field. It requires a current driven in the plasma to generate the magnetic field. It would require massive currents to produce fields you mention.
  11. M

    How voltage amplification affects plasma flux density?

    The plasma density for a fixed gap will generally depend on the current, so increasing the volatge and keeping the power constant will produce a lower plasma density.
  12. M

    Nominal voltage for plasma?

    There is a connention between ionisation potential and voltage. 24 electron volts is the energy gained by a electron in traveling through a potential difference of 24 Volts. So if you have a voltage gap of 24 volts and an electron travels through this gap then it will gain enough energy to...
  13. M

    Can Plasma Be Solid

    It comes down to the definition of a plasma. Plasma behave in a collective way. Some people define a plasma as positive and negative particles but this is not enough. The collection of charged particles must react to shield a potential so that no electric field can be sustained in the plasma...
  14. M

    Plasma shields like in star trek will they be possible

    The concept of a plasma shield does not make sense if you are trying to shield a phyiscal missile. However, the Starship Enterprise will be attacked by high energy beams, of particles or photons (phasors). A plasma shield makes alot of sense in this case. A magnetic field can be used as a...
  15. M

    The affect of different plasmas on each other

    I have never seen an application with colliding plasma. High density plasma are used in industry. These are used in fusion but also in ion sources. I have worked with a dual plasma where you form a hot dense plasma inside a magnetic field and allow it to diffuse across the magnetic field. In...
  16. M

    Can Plasma Be Solid

    wow great questions. The obvious answser is no! you can not have solid plasmas. Plasmas are hot and when you cool them they will lose their charge. But plasma physics is never obvious. And would you believe it there are plasma crystals which behave like solids. They are very interesting...
  17. M

    Water and plasma

    You should check out the concept of a plasma scalpel, This is now used in surgery. It is a plasma is liquid. It forms is an bubble in the liquid. So plasma in water or other liquids is not only possible but now used in hospitals. The reason this is...
  18. M

    What's the excitation temp of He? How to get this?(DBD plasma)

    That is why it is called a non-equilibrium plasma. The gas in the DBD is in equilibrium and has a temperature of 300-400k but the electrons are not in equibrium. The electrons are heated by the electrical field and the DBD contains hot electrons that have energies of several eV. It is these...
  19. M

    Transition from pressurised envoronment to vaccum environment

    I like this questions. Innovative idea. However, passing through a substance might be possible. But not in a standard suit. As the astronaut is halfway through he will experience air pressure on one side and vacuum on the other. Given that his cross-section will be about 1m^2 that's 10 tonnes...
  20. M

    Difference Between Plasma and Radiation

    Hi good question. A plasma is a collective group of charged particles. It consists of both positive and negative particles and there has to be enough particles present in a volume so that they interact in a collective way. So if a space ship meets a plasma the plasma particles will move to...