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Bourgeois, N.

Paper Title Page
TUPC094 Longitudinal Bunch Profile Monitoring via Single Shot Diagnostic with Linear Response 1278
 
  • U. Schmidhammer, V. De Waele, J.-P. Larbre, J.-L. Marignier, H. Monard, M. Mostafavi
    CLIO/ELISE/LCP, Orsay
  • N. Bourgeois, J.-R. Marquès
    LULI, Palaiseau
 
  A new approach of electro-optic (EO) spectral encoding allows for the non-invasive characterization of the longitudinal electron bunch distribution at the ELYSE laser triggered ps pulse radiolysis facility: the transverse electric field of the relativistic bunch is encoded to the temporally dispersed spectrum of a supercontinuum whose wavelength dependent polarisation state is then analyzed with balanced detection. This method combines the spectral bandwidth of the probe that corresponds to a Fourier transform limit < 5 fs with a direct signal response of the detection scheme. As a result, the field amplitude within the EO crystal can be determined in an absolute, undistorted manner with a time window several times longer than the electron pulse. For a time window easily tunable between 0.5 to 100 ps the possible time resolution is ~ 70 fs respectively 1 ps. The diagnostic allows bunch monitoring at the 100 pC level even for low beam energy and brightness. The influence of the accelerator conditions on the charge profile and its stability was able to be studied for the 8 MeV bunches at ELYSE with a 0.5 mm thick ZnTe crystal in a distance of 4 mm to the beam centre.