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Title: Bunching phase and constraints on echo enabled harmonic generation

Abstract

A simple mathematical description is developed for the bunching spectrum in echo enabled harmonic generation (EEHG) that incorporates the effect of additional electron beam energy modulations. Under common assumptions, they are shown to contribute purely through the phase of the longitudinal bunching factor, which allows the spectral moments of the bunching to be calculated directly from the known energy modulations. In particular, the second moment (spectral bandwidth) serves as simple constraint on the amplitude of the energy modulations to maintain a transform-limited seed. Here, we show that, in general, the impact on the spectrum of energy distortions that develop between the EEHG chicanes scales like the harmonic number compared to distortions that occur upstream. This may limit the parameters that will allow EEHG to reach short wavelengths in high brightness FELs.

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1439122
Alternate Identifier(s):
OSTI ID: 1458459
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 21 Journal Issue: 5; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Hemsing, E. Bunching phase and constraints on echo enabled harmonic generation. United States: N. p., 2018. Web. doi:10.1103/PhysRevAccelBeams.21.050702.
Hemsing, E. Bunching phase and constraints on echo enabled harmonic generation. United States. doi:10.1103/PhysRevAccelBeams.21.050702.
Hemsing, E. Fri . "Bunching phase and constraints on echo enabled harmonic generation". United States. doi:10.1103/PhysRevAccelBeams.21.050702.
@article{osti_1439122,
title = {Bunching phase and constraints on echo enabled harmonic generation},
author = {Hemsing, E.},
abstractNote = {A simple mathematical description is developed for the bunching spectrum in echo enabled harmonic generation (EEHG) that incorporates the effect of additional electron beam energy modulations. Under common assumptions, they are shown to contribute purely through the phase of the longitudinal bunching factor, which allows the spectral moments of the bunching to be calculated directly from the known energy modulations. In particular, the second moment (spectral bandwidth) serves as simple constraint on the amplitude of the energy modulations to maintain a transform-limited seed. Here, we show that, in general, the impact on the spectrum of energy distortions that develop between the EEHG chicanes scales like the harmonic number compared to distortions that occur upstream. This may limit the parameters that will allow EEHG to reach short wavelengths in high brightness FELs.},
doi = {10.1103/PhysRevAccelBeams.21.050702},
journal = {Physical Review Accelerators and Beams},
number = 5,
volume = 21,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.21.050702

Citation Metrics:
Cited by: 1 work
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Works referenced in this record:

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    Works referencing / citing this record:

    Soft x-ray seeding studies for the SLAC Linac Coherent Light Source II
    journal, November 2019