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Effects of electron spiralling on the anisotropy and polarization of photon emission from an electron beam ion trap

1999; IOP Publishing; Volume: 32; Issue: 22 Linguagem: Inglês

10.1088/0953-4075/32/22/314

1361-6455

Minfeng Gu, D. W. Savin, P. Beiersdörfer,

Mass Spectrometry Techniques and Applications

We present a theoretical formalism for calculating the anisotropy and polarization of photon emission due to a spiralling beam of electrons colliding with an ensemble of atoms or ions. For an axisymmetric beam with a given velocity angular distribution, the polarization and angular distribution of the resulting radiation can be characterized by the expansion coefficients of the distribution function in terms of Legendre polynomials. We present simple expressions for dipole and quadrupole radiation and apply the results to the case of an electron beam ion trap.