Contribution to a conference proceedings/Contribution to a book

PUBDB-2018-03279

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Characterization of Polarization-Dependent Emittance From an Array of Au Nanorods using Velocity Map Imaging Spectrometer

Ye, H. (Corresponding author)CFEL*Extern* ; Fallahi, A.CFEL*DESY* ; Kärtner, F.CFEL*Extern*DESY* ; Küpper, J.CFEL*DESY* ; Muecke, O.CFEL*DESY* ; Rossi, G. M.CFEL*Extern* ; Trippel, S.CFEL*DESY*

2018
JACoW Publishing Geneva
ISBN: 978-3-95450-184-7

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Please use a persistent id in citations: doi:10.18429/JACOW-IPAC2018-TUPML031  doi:10.3204/PUBDB-2018-03279

Abstract: 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.

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Contributing Institute(s):

1. beauftragt von UNI (UNI/CUI)
2. FS-CFEL-2 (CFEL-UFOX)
3. Ultrafast Lasers & X-rays Division (FS-CFEL-2)
4. Controlled Molecule Imaging (FS-CFEL-CMI)
5. Uni Hamburg / Experimentalphysik (UNI/EXP)
6. CFEL-Coherent X-Ray Imaging (FS-CFEL-1)

Research Program(s):

1. 631 - Accelerator R D (POF3-631) (POF3-631)
2. AXSIS - Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy (609920) (609920)
3. CUI - Hamburger Zentrum für ultraschnelle Beobachtung (194651731) (194651731)
4. DFG project 281310551 - SOLSTICE - Festkörper in starken terahertz und infrarotenTräger-Einhüllende phasenstabilen Wellenformen (281310551) (281310551)
5. ACHIP - Laser Accelerators on a Chip (ACHIP_2015-10-01) (ACHIP_2015-10-01)
6. COMOTION - Controlling the Motion of Complex Molecules and Particles (614507) (614507)

Experiment(s):

1. Experiments at CFEL

Appears in the scientific report 2018

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