We show that the spectral properties of a self-amplified spontaneous emission x-ray free-electron laser can be controlled by modulating the gain in magnetic undulators, thus producing one or several spectral lines within a single few femtosecond pulse. By varying the magnetic field along the undulator and the electron beam transport line, the system we demonstrate can tailor the x-ray spectrum ...

We explore theoretically how the coupling to cavity vacuum fields affects electron transport in quantum conductors due counter-rotating-wave terms of light-matter interaction. determine conductance transmission coefficients predicted by an effective Hamiltonian. The between bare electronic states is mediated virtual processes involving intermediate with one (or hole) on top Fermi sea and photon...

PURPOSE To design a rotating anode X-ray tube capable of operating in strong magnetic field environments. This tube design can be used in 'close proximity" hybrid X-ray/MR system geometries where the imaging fields of view are separated by only ∼1.2 meters. METHODS Existing rotating anode X-ray tube designs fail in strong magnetic field environments because the fields alter the electron traje...

Effects of irradiation on the electronic conductance in nanowires, for field-free conditions and under the influence of applied longitudinal magnetic fields, were investigated. The nanowires were modeled within the free-electron framework with a parabolic ~transverse! confining potential. Our results for the dependence of the photoconductance of irradiated nanowires on the photon energy and/or ...

We examine the effect of weak, small scale magnetic field structure on the rate of reconnection in a strongly magnetized plasma. We recover lower and upper limits on the reconnection rate, depending on the reaction of the magnetic field to stresses exerted from within the reconnection layer. Using Goldreich and Sridhar’s model of strong turbulence in a magnetized plasma with negligible intermit...