Recent content by LuisVela

Hi While working on a plasma device, we found the need to track the electrons downstream. We needed an emitting-electron probe (e-e probe) but we didn't want to buy anything expensive. We found that a good way to construct one, was to use a lantern's light bulb (A good old Mag-Lite will do...

Hi guys. I was reading some QM and they mentioned exp(a+b)=exp(a)*exp(b) only if [a,b]=0; so I thought to go to the series definition of exp(x) and work it out by myself. I do understand where the problem arises if suddenly a and b don't commute anymore, but that's not my problem. I want to...

@ Vanhees 71: Hey!, thanks for your reply. But I still don't understand your comment. \vec{v}^2=\vec{v}\cdot\vec{v}\in R which is also a scalar. I guess you misunderstood my no0tation (sorry for thta XD, my mistake). E is not the electric field. E is the total mechanical energy of the...

Hello everybody. I have the following problem: I am given a Speed distribution function, f(v). This distribution is normalized to the total number of particles there are, that's equivalent to: \int_0^\infty f(v) dv = n_0 (particles traveling away from my target are not considered.)Now. I know...

Hello everybody. Im starting a project on the basic processed undergoing in the edge plasma region. ( I mean, near the walls of a plasma confining device, like a tokamak or so.) I was wondering if you could name some ''things'' I should be aware of in order to make a small PIC code or...

Hi there, I read the paper. I think he is jumping to deeper and more complicated explanations too soon. Here is some curious result, that helps understand my point of view: If the ball on the top of the dome has already been set in motion, i.e. is already falling to a given direction, we...

That is great!, thanks a lot. BTW, what do you know about the Erasmus Mundus program in Fusion, I just remebered it because I saw the Gent University logo. Is it only focused on engineering and technology of Fusion?..or it also includes theoretical work on plasma physics?

I would like to ask, where did you get that pdf about the sizes of tokamaks?

There is another fact besides size. Iter, like the SouthCorean Tokamak ''K-Star'' will use super conducting magnets, therefore the energy lost by Ohms law, and Ohms heating is literally out of the picture. I am sure that adds up to reducing the amount of input energy.

So it is the biharmonic operator indeed ! Thanks a loot

I think i solved it. Fourier acting on laplace squared being equal to the square of F on Laplace is actually easy to prove... The only thing remaining to understand is the 'meaning' of laplace squared. Laplace acting on a function is an operation from R3-->R1, so you can't apply Laplace over...

...limits of integration...got it!

Hello there =) I got it, its a brilliant way of proving it. But i think I am missing something ... isnt it true that: e^{-i\frac{\pi}{4}}=\cos{\frac{\pi}{4}}-i\sin{\frac{\pi}{4}} ? and \cos{\frac{\pi}{4}}=\sin{\frac{\pi}{4}}=\frac{\sqrt{2}}{2} which ,I don't know how, got to be...

Hello Everybody. I gave a quick look onto the internet but i couldn't get anything interesting. Heres my problem. Im solving the differential equation given by: (-\Delta+k^2)^2u=\delta Where \delta is the dirac delta distribuiton (and u is thought as a distribution as well) The...

Formula No. 4 is even better...cant get any easier!