Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit

Journal Article · Wed Jan 28 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4906786· OSTI ID:22413007

Waldecker, Lutz; Bertoni, Roman; Ernstorfer, Ralph ^[1]

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1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin (Germany)

We present the design and implementation of a highly compact femtosecond electron diffractometer working at electron energies up to 100 keV. We use a multi-body particle tracing code to simulate electron bunch propagation through the setup and to calculate pulse durations at the sample position. Our simulations show that electron bunches containing few thousands of electrons per bunch are only weakly broadened by space-charge effects and their pulse duration is thus close to the one of a single-electron wavepacket. With our compact setup, we can create electron bunches containing up to 5000 electrons with a pulse duration below 100 fs on the sample. We use the diffractometer to track the energy transfer from photoexcited electrons to the lattice in a thin film of titanium. This process takes place on the timescale of few-hundred femtoseconds and a fully equilibrated state is reached within 1 ps.

• OSTI ID: 22413007
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM BUNCHING
BEAM TRANSPORT
COMPUTERIZED SIMULATION
DESIGN
DIFFRACTOMETERS
ELECTRON BEAMS
ELECTRON DIFFRACTION
ELECTRONS
ENERGY TRANSFER
IMPLEMENTATION
KEV RANGE
SPACE CHARGE
THIN FILMS
TITANIUM
WAVE PACKETS