Plasma Definition and 681 Threads

So, I'm considering the match up between Goku and, let's say, an armored mech. I wrote out rules for a GURPS game based on Dragon Ball flavor and powers but kind of a more logically consistent version of that universe that I have written probably a couple dozen pages about so far. So, the...

I have a thin copper tube of 4.4mm inner diameter (inside a long ionizer plasma cannon) and I want to fill in with hydrogen plasma fully ionized at low temperature (100eV), what is recommended magnetic field to have the ions there without touching tha walls? The plasma life is about 0.5 seconds

What kind of ion sensor can I use in the range 1e19to 1e22 ions/m3? (corresponds to 0.1 to 5 pascals if non ionized) Does it exist any sensor based in the charge capacity?

Excuse me if this is naive question :oldsmile: Plasma is gas where all atoms are ionized. I would like to know if liquid or solid plasma can exist. Let’s take chemical element Lithium, its atom has got 3 electrons and Lithium’s crystal lattice is arranged like this...

Hi there, I am currently doing a project involving cold-plasma technology systems. I am struggling to find papers relating to surface-micro barrier discharge systems, and the difference between those and dielectric barrier discharge systems. Any help would be greatly appreciated, however basic.

Homework Statement Are longitudinal magnetic waves possible? Give reasons for your answer. Homework Equations Working with Maxwell's equations, Lorentz force, electrostatic and electromagnetic waves in plasma. The Attempt at a Solution No idea whatsoever. I believe it is possible based on...

Homework Statement Prove that in an MHD equilibrium state in a pinch with flux and Bθ(r) and Bz(r), the equation for pressure is; d/dr(P + B2/8π) + Bθ2/4πr - ρ( u2θ/r)= 0 B is the total Magnetic field, uθ(r) the velocity of plasma, ρ= density, and solving in a (r,θ,z) system Homework...

In general, when we say that in a fermionic gas the higher its density, the better we can consider it to be a plasma instead of gas?

When do we use the equations of curvature drift ( ΔΒ⊥Β) V∇B= ±1/2u⊥rL (B x ∇B)/B2 and the general VF= c/q (F x B)/B2? For particles like muons and protons, do they need different equations to calculate a gas' drift velocity, when the gas is made of protons or muons instead of electrons? Am I...

When do we use the Boltzmann equation for density in a Fermi plasma? n in [cm-3] and when do we use the ρ=m/V, ρ in [Kg/m3 ] (this is not an example, I just added the equations to make my question more understandable) Is the ideal gas only when we have electron and ions? Is the Boltzmann...

Homework Statement Cylinder electron gas with density of ne= 1010 and radius or r=1cm is inside magnetic field of B=104 Gauss. If we change the electron gas with (i) muon gas (ii) proton gas does the Drift Velocity change? Homework Equations [/B] Boltzmann equation of density...

I am trying to understand the "strong" negative E field in the Aston Dark Space in the thin region close to the cathode or else even the cathode surface. See the diagram at: http://www.glow-discharge.com/?Physical_background:Glow_Discharges My question regards the "Electrical Field E" graph...

Homework Statement We are investigating hydrogen in a plasma with the temperature 4500 ºC. Calculate the probability per atom and second for stimulated emission from 2p to 1s if the lifetime of 2p is 1.6 ns Homework Equations ##A=\frac{1}{\Sigma \tau}## $$A_{2,1} = \frac{8*\pi *h *...

How does plasma particles (ions, electrons, neutral particles as a whole) interact with an applied steady-state magnetic field? If you have plasma at atmospheric pressure ejected from a plasma torch in the z-axis direction (upwards/north), how will two permanent magnets, axially aligned N-S to...

How does the corona develope into stream and disapear finall

For a Year 12 Assignment I have to do a seminar on how magnetic fields are involved with a certain topic. I chose nuclear fusion energy production and specifically the tokamak. I understand that a toroidal magnetic field is created when a current is sent through a solenoid wrapped in a torus...

How do i get this equation, $$\frac{db}{dl}=(\hat{B}.∇)\hat{b}$$ This equation is a vector whose direction is towards the centre of the circle which most closely approximates the magnetic field-line at a given point, and whose magnitude is the inverse of the radius of this circle. However I...

I study engineering physics and I’m interested in plasma physics and cosmology

Homework Statement So I have got the question below. I am asked to find the phase difference between the electric field and magnetic field of electromagnetic waves traveling in a plasma, using the electrical conductivity expression. Now I have found the frequency of the waves and I know that...

When a lightning bolt strikes the earth, the air molecules are turned into plasma which causes the "light" that we see. What happens to the plasma air molecules after a lightning bolt? Do the positive/negative charged molecules find free electrons in the air and resume to be neutrally charged...

HI, I have embarked on a small project basically it is for my daughters dance routine prop. I was wondering if I could power a small plasma ball with a battery. The plasma ball power supply specs are: Output: DC 12V 350mA MAX 4.2W It has to be mobile it will sit on a small table which has to be...

If you were to have some way to remove plasma out of a tokamak or stellarator, how would it act? I realize there's basically no way to actually remove plasma from those machines, but I'm curious how plasma would act in the actual atmosphere. Would it act like a plasma cutter? Would it stay...

I may be grossly generalizing the principle, but is there a way to calculate the energy needed to transform a solid/liquid/gas into plasma? Information is easily found on enthalpy of fusion/vaporization/sublimation, but I couldn't find anything regarding transforming to the 4th state of matter...

I am an undergrad physics major in my final semester currently taking Intro to Thermodynamics. As a final project, each student must choose a topic related to thermodynamics that is more advanced than what is covered in the curriculum and write a paper and present our findings to the class on...

I have not had any luck finding a fuse that will burn out fast at voltages below a volt. Is there no such thing? Thanks!

The theory of electroweak temperature says that when you have a plasma of particles at energy above the electroweak phase transition (100 GeV). The Higgs field would turn from nonzero vev to zero and the electroweak forces would unite and the electroweak bosons would become massless. What...

Plasma ball has a high voltage. Why don't we get an electric shock when we touch it?

I was wondering about the filament colors in a plasma ball that I have got. The main part of each filament is blue, but its end part is pink. Possibly the gas is 95% neon and 5% xenon, the pink part is light emitted by neon, and blue part light emitted by xenon. Using a hand spectroscope I...

Hello, Many Researchers talked about the following parameters: 1. Propagation length of the surface plasma wave(spw). 2. penetration depth of surface plasma wave(spw). 3. concentration of the (spw). 4. the equation of the interface in vacuum - plasma interface. I feel confused regarding such...

Does plasma react to eletromotive force

If plasma is just ionized gas isn't it basically just a sea of mobile electrons but in gas, if not then how can a bunch of electrons and positive ions stay separate and the gas ionized for long.

I am having trouble in making a power source for the DBD. I can't seem to find any calculations to get the required voltage and frequency of AC to generate plasma. I want to know the circuit/method/equipment needed to generate that voltage from a normal 220 V/50 Hz AC socket in my lab.I am doing...

A plasma is quasinetural with the negative charges (electrons) being much lighter than positive ions. When an electron is perturbed, the attractive force acts to restore it with a particular frequency. This was the explanation given to me for plasma oscillations. However, the equation presented...

<Moderator's note: Moved from the homework forum.> Homework Statement The following equation is one of a few equations that describe a plasma model. The left hand side is the part I am having trouble with in that I can't seem to visualise what (V dot delV) actually does. My physics teacher has...

I'm working on a thought experiment. I want to know how much of the kinetic energy from a liquid mercury piston will be converted into work done on the hydrogen plasma in the form of compression, and how much work will be done on the piston in the form of compression. Note: assume piston walls...

I've read on wikipedia that the force drifts of the guiding centers off particles in a magnetic field also occurs in cold plasma. But does it occur in a cold plasma (Partially Ionized ) in which the mean free time is less than the gyro frequency time? I thought that the drift were present...

Does electron gas in metals experience viscosity? Also, does highly charged plasma experience viscosity?

I've recently learned that conductors can achieve stability when placed in an alternating electric field. This is because of Lenz's law. So I was wondering if we could levitate a conductor and stabilize it, can we do the same thing with a plasma? If we can create a magnetic cusp, but oscillate...

https://futurism.com/stable-plasma-ring-created-open-air-first-time-ever/

Greetings everybody, Right now I'm applying to graduate physics programs, but since it's an expensive process I'm trying to be at least a little selective in my approach. Since my research interests are in plasma physics, I've limited myself to schools with a program in such. So far I've...

Someone asked if it was possible to conduct electricity through a wire with a plasma. I ran across a article about a inventor who wanted to turn a antenna on and off very quickly. He said it was possible to do this by using a florescent light bulb as a element in the antenna. When a...

I must find parameters for equation [1] in this link http://onlinelibrary.wiley.com/doi/10.1002/jgra.50543/pdf for satelite in height from 100km until 300km. Have to use IRI and IGRF. Any help with answer?

Hello, I may working through attached paper and really need help with deriving equation in appendix - A4 to give A10. http://iopscience.iop.org/article/10.1088/0004-637X/744/2/182/pdf Any help would be greatly appreciated. thanks, Sinéad

Hello, I am trying to work through attached paper, deriving from equation 2.2 to 2.4. I am not familiar with the notation. If I try and get the integral of inside the <> brackets, I end up with a different eqn 2.4. I need some maths help here :) Any help would be greatly appreciated...

I was passing time by Googling the properties of the sun (temperature, mass, etc) and got to wondering what lies at the center of stars. I found out its plasma under roughly 340 billion atmospheres of pressure. I realize Boyles law may not be strictly meant for plasmas, but using it I...

Hello, I'm studying dielectric barrier discharges (DBD) at atmospheric pressure. I'd like to have some references on highly collisional sheaths in radio-frequency discharges. I know the treatment becomes very complicated and one usually uses kinetic simulations, but nonetheless I'd like to see...

Hi guys I'm finishing up some promo art for my original comic book. You're seein it here first. But its missing something- an appropriate equation. I would like to integrate a math equation into the art. I am attempting to depict FTL travel, using qualities similar to an LWFA, the plasma being...

i study the electrostatic waves at plasma (as a beginner) and i come to some questions and hope to find a help 1) how could we ignore magnetic field (taking B =0) although we have oscillating charges (what particularly electrostatic wave means ) 2) at studying ion acoustic they always...

Hello everybody! I have been thinking about something for a while now. I would like to make a magnetic nozzle for a rocket engine. Basically, I would like to ionize the hot and high pressure gaz in the combustion chamber and then use a strong magnetic field to adjust the nozzle throat...

Homework Statement Im stuck on a old exam in plasma physics. It is about how to determine dispersion relations for high frequency waves in cold plasma's. I'm not sure how they do in the solution manual. Homework Equations B = B_0z^ E = E_0exp(i(kx-wt))z^ The Attempt at a Solution The...