Vector-based feedback of continuous wave radiofrequency compression cavity for ultrafast electron diffraction

Sutter, Thomas M.; Lee, Joshua S. H.; Kulkarni, Atharva V.; Musumeci, Pietro; Kogar, Anshul

doi:10.1063/4.0000231

Title: Vector-based feedback of continuous wave radiofrequency compression cavity for ultrafast electron diffraction

Journal Article · 24 March 2024 · Structural Dynamics

DOI: https://doi.org/10.1063/4.0000231 · OSTI ID:2565048

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University of California, Los Angeles, CA (United States)

The temporal resolution of ultrafast electron diffraction at weakly relativistic beam energies (⁠≲100 keV) suffers from space-charge induced electron pulse broadening. We describe the implementation of a radio frequency (RF) cavity operating in the continuous wave regime to compress high repetition rate electron bunches from a 40.4 kV DC photoinjector for ultrafast electron diffraction applications. Active stabilization of the RF amplitude and phase through a feedback loop based on the demodulated in-phase and quadrature components of the RF signal is demonstrated. This scheme yields 144 ± 19 fs RMS temporal resolution in pump–probe studies.

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Research Organization:: University of California, Los Angeles, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0023017

OSTI ID:: 2565048

Journal Information:: Structural Dynamics, Journal Name: Structural Dynamics Journal Issue: 2 Vol. 11; ISSN 2329-7778

Publisher:: AIP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter physics
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Title: Vector-based feedback of continuous wave radiofrequency compression cavity for ultrafast electron diffraction

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