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Title: Postsaturation dynamics and superluminal propagation of a superradiant spike in a free-electron laser amplifier

Abstract

We study the dynamics of an isolated spike of radiation in superradiant regime. We show that conditions exist where the pulse moves with a group velocity larger than the velocity of light in vacuum and is followed by a pedestal resulting from a complex postsaturation dynamics. The tail is constituted by a train of subpulses with both transverse and longitudinal coherence and decaying amplitudes. We analyze the dynamical conditions leading to the formation of the main pulse and the tail. We study the correlation of the tail structure with the longitudinal phase space of the electrons, and provide a recipe to partially suppress this tail.

Authors:
 [1];  [2];  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Elettra-Sincrotrone Trieste (Italy)
  3. Elettra-Sincrotrone Trieste (Italy); Lab. Nazionali di Frascati (Italy)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1593245
Report Number(s):
BNL-213561-2020-JAAM
Journal ID: ISSN 2469-9888; PRABCJ; TRN: US2101082
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 23; Journal Issue: 1; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Yang, Xi, Mirian, Najmeh, and Giannessi, Luca. Postsaturation dynamics and superluminal propagation of a superradiant spike in a free-electron laser amplifier. United States: N. p., 2020. Web. doi:10.1103/PhysRevAccelBeams.23.010703.
Yang, Xi, Mirian, Najmeh, & Giannessi, Luca. Postsaturation dynamics and superluminal propagation of a superradiant spike in a free-electron laser amplifier. United States. https://doi.org/10.1103/PhysRevAccelBeams.23.010703
Yang, Xi, Mirian, Najmeh, and Giannessi, Luca. Mon . "Postsaturation dynamics and superluminal propagation of a superradiant spike in a free-electron laser amplifier". United States. https://doi.org/10.1103/PhysRevAccelBeams.23.010703. https://www.osti.gov/servlets/purl/1593245.
@article{osti_1593245,
title = {Postsaturation dynamics and superluminal propagation of a superradiant spike in a free-electron laser amplifier},
author = {Yang, Xi and Mirian, Najmeh and Giannessi, Luca},
abstractNote = {We study the dynamics of an isolated spike of radiation in superradiant regime. We show that conditions exist where the pulse moves with a group velocity larger than the velocity of light in vacuum and is followed by a pedestal resulting from a complex postsaturation dynamics. The tail is constituted by a train of subpulses with both transverse and longitudinal coherence and decaying amplitudes. We analyze the dynamical conditions leading to the formation of the main pulse and the tail. We study the correlation of the tail structure with the longitudinal phase space of the electrons, and provide a recipe to partially suppress this tail.},
doi = {10.1103/PhysRevAccelBeams.23.010703},
journal = {Physical Review Accelerators and Beams},
number = 1,
volume = 23,
place = {United States},
year = {2020},
month = {1}
}

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