Nonlinear magneto-optic effects with ultranarrow widths

Abstract Several dispersion-like features in the magnetic field dependence of the nonlinear magneto-optic effect were observed in an experiment performed on rubidium atoms contained in a vapor cell with anti-relaxation coating. The narrowest feature has effective resonance width γ=gµ∆B z ≈1.3 Hz, where ∆B z ≈2.8 µGs is the peak-to-peak separation. The observed nontrivial dependence of the magneto-optic effect on transverse magnetic fields is discussed. The results of this work may be applied to low-field magnetometry, to parity where g is the Lande factor, µ is the Bohr magneton, and ∆B z is the peak-to-peak separation of the feature. This is approximately eight or nine orders of magnitude narrower than the effective widths of the linear resonant Faraday (Macaluso-Corbino

Beam energy spread in FERMI@elettra gun and linac induced by intrabeam scattering

Intrabeam scattering (IBS) of electrons in the pre-cathode area in the electron guns know in the literature as Boersh effect is responsible for a growth of the electron beam energy spread there. Albeit most visible within the electron gun where the electron beam density is large and the energy spread is small, the IBS acts all along the entire electron beam pass through the Linac. In this report we calculate the energy spread induced by IBS in the FERMI@elettra electron gun

ABSOLUTE BUNCH LENGTH MEASUREMENTS AT THE ALS BY INCOHERENTSYNCHROTRON RADIATION FLUCTUATION ANALYSIS

By analysing the pulse to pulse intensity fluctuations ofthe radiation emitted by a charge particle in the incoherent part of thespectrum, it is possible to extract information about the spatialdistribution of the beam. At the Advanced Light Source (ALS) of theLawrence Berkeley National Laboratory, we have developed and tested asimple scheme based on this principle that allows for the absolutemeasurement of the bunch length. A description of the method and theexperimental results are presented