Characterization of transverse electron pulse trains using RF powered traveling wave metallic comb striplines
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
- Euclid Techlabs, LLC, Bolingbrook, IL (United States)
- JEOL USA LTD, Peabody, MA (United States)
Advancements in ultrafast electron microscopy have allowed elucidation of spatially selective structural dynamics. However, as the spatial resolution and imaging capabilities have made progress, quantitative characterization of the electron pulse trains has not been reported at the same rate. In fact, inexperienced users have difficulty replicating the technique because only a few dedicated microscopes have been characterized thoroughly. Systems replacing laser driven photoexcitation with electrically driven deflectors especially suffer from a lack of quantified characterization because of the limited quantity. The primary advantages to electrically driven systems are broader frequency ranges, ease of use and simple synchronization to electrical pumping. Here, we characterize the technical parameters for electrically driven UEM including the shape, size and duration of the electron pulses using low and high frequency chopping methods. At high frequencies, pulses are generated by sweeping the electron beam across a chopping aperture. For low frequencies, the beam is continuously forced off the optic axis by a DC potential, then momentarily aligned by a countering pulse. Using both methods, we present examples that measure probe durations of 2 ns and 10 ps for the low and high frequency techniques, respectively. Here, we also discuss how the implementation of a pulsed probe affects STEM imaging conditions by adjusting the first condenser lens.
- Research Organization:
- Euclid Techlabs, LLC, Bolingbrook, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0013121; SC0012704; DESC0012704
- OSTI ID:
- 1970023
- Alternate ID(s):
- OSTI ID: 1968925; OSTI ID: 1975240
- Report Number(s):
- BNL-224451-2023-JAAM; TRN: US2313476
- Journal Information:
- Ultramicroscopy, Vol. 249; ISSN 0304-3991
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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ultrafast transmission electron microscopy
UTEM
STEM
ultrafast pulser
pump-probe
RF chopped beam
instrumentation
copper mesh
instrument characterization
time-resolved instrument development
electron beam manipulation
ultrafast electron microscopy