Dresden 2020 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 9: Diagnostics, Control and Instrumentation
AKBP 9.2: Talk
Tuesday, March 17, 2020, 16:45–17:00, MOL 213
Advanced temporal and spatial electron bunch diagnostics for laser-wakefield accelerated electron bunches — •Omid Zarini1, Maxwell LaBerge3, Jurjen Couperus Cabadag1, Alexander Köhler1, Richard Pausch1, Thomas Kurz1,2, Susanne Schöbel1,2, Yen-Yu Chang1, Michael Bussmann1, Michael Downer3, Ulrich Schramm1,2, Alexander Debus1, and Arie Irman1 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technische Universität Dresden — 3University of Texas at Austin
Laser wakefield accelerators (LWFA) feature unique electron bunch characteristics, namely micrometer beam size with duration ranging from a few fs to tens of fs. Precise knowledge of the longitudinal profile of such ultra-short electron bunches is essential for the design of future table-top x-ray light-sources. Our broadband, single-shot spectrometer combines the coherent transition radiation (CTR) spectrum in UV/VIS, near-IR and mid-IR. Our fully calibrated spectrometer is capable to characterize electron bunches with charges as low as 1 pC and resolve time-scales from 0.4 to 40 fs. In addition, complementary data on the transverse bunch profile is provided by simultaneously imaging the CTR in the far- and near-field. We present recent experimental results on electron bunch profiles and peak currents of different LWFA injection mechanisms. Furthermore, we present single-shot CTR imaging and interferometry data from electron bunches. We combine near field (NF) and far field (FF) imaging of CTR from a foil just outside the accelerator to determine the transverse structure of micro-bunched portions of the beam.