TY  - CONF
AU  - Ye, Hong
AU  - Fallahi, Arya
AU  - Kärtner, Franz
AU  - Küpper, Jochen
AU  - Muecke, Oliver
AU  - Rossi, Giulio Maria
AU  - Trippel, Sebastian
TI  - Characterization of Polarization-Dependent Emittance From an Array of Au Nanorods using Velocity Map Imaging Spectrometer
CY  - Geneva
PB  - JACoW Publishing
M1  - PUBDB-2018-03279
SN  - 978-3-95450-184-7
SP  - 1612-1614
PY  - 2018
AB  - Electron beams of high quality, e.g., low emittance, are of crucial importance for cutting-edge scientific instruments, such as x-ray free electron lasers (XFELs) and ultrafast electron diffraction (UED) setups. A velocity-map-imaging (VMI) spectrometer was implemented to characterize the intrinsic root-mean-square (rms) normalized emittance from photocathodes. The spectrometer operated in both, spatial map imaging (SMI) and VMI modes. Therefore, spatial- and velocity-coordinates were recorded independently and quickly. The technique allows for fast complete emittance measurements, within minutes. A 75 μm pitch array of Au nanorods of dimension 100 × 30   nm, was studied under strong-field-emission regime by 100 fs 1 kHz 1.3 μm laser pulses with a 300 × 30 μm² focus spot size on the sample. A patterned electron bunch was observed, each emitted from a single nanorod within the array. A polarization dependent photoemission study was performed showing a smaller rms-normalized divergence of 0.8 mrad with the laser polarization normal to the sample surface, compared to 1.15 mrad for the parallel case.
T2  - 9th International Particle Accelerator Conference
CY  - 29 Apr 2018 - 4 May 2018, Vancouver (Canada)
Y2  - 29 Apr 2018 - 4 May 2018
M2  - Vancouver, Canada
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
DO  - DOI:10.18429/JACOW-IPAC2018-TUPML031
UR  - https://bib-pubdb1.desy.de/record/409100
ER  -