| Paper | Title | Page |
|---|---|---|
MOCP02 |
Non-Destructive, Shot-by-Shot Real-Time Monitor to Measure 3D Bunch Charge Distribution | |
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| Non-destructive, shot-by-shot real-time monitors have been developing to measure 3D bunch charge distribution (BCD). This ambitious monitor is based on Electro-Optic (EO) multiple sampling technique in a manner of spectral decoding that is non-destructive and enables real-time measurements of the longitudinal and transverse BCD. This monitor was materialized in simultaneously probing eight EO crystals that surround the electron beam axis with a radial polarized and hollow EO-probe laser pulse. In 2009, the concept of 3D-BCD monitor was verified through bunch measurements in SPring-8 photoinjector. The further target of the temporal resolution is ~30 fs (FWHM), utilizing an organic EO crystal (DAST) instead of conventional inorganic EO crystals (ZnTe, GaP, etc.) The EO-sampling with DAST crystal has been expected to measure a bunch length less than 30 fs (FWHM). However, it has never been realized in practice. In 2011, the first bunch measurement with an organic EO crystal (DAST) has been successfully demonstrated in the VUV-FEL accelerator at SPring-8. According to preliminary results of our experiments, the estimated temporal resolution of DAST should be less than ~50 fs (FWHM). | ||