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Title: Laser Seeding of the Storage-Ring Microbunching Instability for High-Power Coherent Terahertz Radiation

Abstract

We report the first observation of laser seeding of the storage-ring microbunching instability. Above a threshold bunch current, the interaction of the beam and its radiation results in a coherent instability, observed as a series of stochastic bursts of coherent synchrotron radiation (CSR) at terahertz frequencies initiated by fluctuations in the beam density. We have observed that this effect can be seeded by imprinting an initial density modulation on the beam by means of laser ''slicing.'' In such a situation, most of the bursts of CSR become synchronous with the pulses of the modulating laser and their average intensity scales exponentially with the current per bunch. We present detailed experimental observations of the seeding effect and a model of the phenomenon. This seeding mechanism also creates potential applications as a high-power source of CSR at terahertz frequencies.

Authors:
; ; ; ; ; ; ;  [1]
  1. Ernest Orlando Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
20860694
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 97; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevLett.97.074802; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM BUNCHING; INSTABILITY; LASERS; MODULATION; PULSES; STORAGE RINGS; SYNCHROTRON RADIATION

Citation Formats

Byrd, J M, Hao, Z, Martin, M C, Robin, D S, Sannibale, F, Schoenlein, R W, Zholents, A A, and Zolotorev, M S. Laser Seeding of the Storage-Ring Microbunching Instability for High-Power Coherent Terahertz Radiation. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.074802.
Byrd, J M, Hao, Z, Martin, M C, Robin, D S, Sannibale, F, Schoenlein, R W, Zholents, A A, & Zolotorev, M S. Laser Seeding of the Storage-Ring Microbunching Instability for High-Power Coherent Terahertz Radiation. United States. doi:10.1103/PHYSREVLETT.97.074802.
Byrd, J M, Hao, Z, Martin, M C, Robin, D S, Sannibale, F, Schoenlein, R W, Zholents, A A, and Zolotorev, M S. Fri . "Laser Seeding of the Storage-Ring Microbunching Instability for High-Power Coherent Terahertz Radiation". United States. doi:10.1103/PHYSREVLETT.97.074802.
@article{osti_20860694,
title = {Laser Seeding of the Storage-Ring Microbunching Instability for High-Power Coherent Terahertz Radiation},
author = {Byrd, J M and Hao, Z and Martin, M C and Robin, D S and Sannibale, F and Schoenlein, R W and Zholents, A A and Zolotorev, M S},
abstractNote = {We report the first observation of laser seeding of the storage-ring microbunching instability. Above a threshold bunch current, the interaction of the beam and its radiation results in a coherent instability, observed as a series of stochastic bursts of coherent synchrotron radiation (CSR) at terahertz frequencies initiated by fluctuations in the beam density. We have observed that this effect can be seeded by imprinting an initial density modulation on the beam by means of laser ''slicing.'' In such a situation, most of the bursts of CSR become synchronous with the pulses of the modulating laser and their average intensity scales exponentially with the current per bunch. We present detailed experimental observations of the seeding effect and a model of the phenomenon. This seeding mechanism also creates potential applications as a high-power source of CSR at terahertz frequencies.},
doi = {10.1103/PHYSREVLETT.97.074802},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 7,
volume = 97,
place = {United States},
year = {2006},
month = {8}
}