I Injection radius in a Penning trap

  • I
  • Thread starter Thread starter Malamala
  • Start date Start date
Malamala
Messages
345
Reaction score
28
Hello! When an ion is injected in a Penning trap, how well is its initial radius know? I understand that usually people use cooling mechanism to reduce that radius as much as needed, but I was wondering in the beginning, before the cooling starts, how small is the radius of the ion and how well is it know? Thank you!
 
Physics news on Phys.org
Not sure I understand the question. It isn't known until it's measured. Typically the initial position of an ion depends on how it's loaded to the trap. I am sure the probability distribution for loading an ion would be very different in the ALPHA experiment compared to the electron g-2 measurement (for example).

The most general answer I can give is that the expectation value of the radial position of the ion is determined by the velocity distribution of the ions being loaded and trapping potential (if loading axially) or the strength of the magnetic field (if loading radially).
 
From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...
Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...

Similar threads

Replies
16
Views
2K
Replies
1
Views
1K
Replies
1
Views
1K
Replies
13
Views
2K
Replies
5
Views
2K
Replies
0
Views
798
Back
Top