Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers

Title: Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers

Full Record
Other Related Research

Abstract

In general, the inherent statistical variances in the laser-driven plasma accelerators (LPAs) and self-amplified spontaneous emission (SASE) free electron lasers (FELs) motivate the use of single-shot diagnostics. In addition, the microbunching phenomenon in each is also variable, so coherent optical transition radiation (COTR) techniques also warrant single-shot evaluations. In both cases, the enhancements of the signals enable optical beam splitters to be used to direct light to the different measuring devices for electron beam size, divergence, spectral content, and/or bunch length as appropriate. COTR Interferometry (COTRI) modelling results for the pre-buncher case at 266 nm and for the LPA case at 633 nm are presented. In addition, examples of few-micron beam size and sub-mrad beam divergence measurements from a single shot of an LPA are reported.

Authors:

Lumpkin, Alex H. ^[1]; Rule, Donald W. ^[2]

Fermilab
Unlisted, MD

Publication Date:: 2019-09-01

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

OSTI Identifier:: 1572510

Report Number(s):: FERMILAB-CONF-19-467-AD
oai:inspirehep.net:1761796

DOE Contract Number:: AC02-07CH11359

Resource Type:: Conference

Resource Relation:: Conference: 8th International Beam Instrumentation Conference, Malmo, Sweden, 09/08-09/12/2019

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS

Citation Formats


                    Lumpkin, Alex H., and Rule, Donald W. Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers.  United States: N. p., 2019. 
        Web.

Copy to clipboard


                    Lumpkin, Alex H., & Rule, Donald W. Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers.  United States.

Copy to clipboard


                    Lumpkin, Alex H., and Rule, Donald W. Sun .  
        "Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers".  United States.  https://www.osti.gov/servlets/purl/1572510.

Copy to clipboard


                    
@article{osti_1572510,

  title        = {Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers},

  author       = {Lumpkin, Alex H. and Rule, Donald W.},

  abstractNote = {In general, the inherent statistical variances in the laser-driven plasma accelerators (LPAs) and self-amplified spontaneous emission (SASE) free electron lasers (FELs) motivate the use of single-shot diagnostics. In addition, the microbunching phenomenon in each is also variable, so coherent optical transition radiation (COTR) techniques also warrant single-shot evaluations. In both cases, the enhancements of the signals enable optical beam splitters to be used to direct light to the different measuring devices for electron beam size, divergence, spectral content, and/or bunch length as appropriate. COTR Interferometry (COTRI) modelling results for the pre-buncher case at 266 nm and for the LPA case at 633 nm are presented. In addition, examples of few-micron beam size and sub-mrad beam divergence measurements from a single shot of an LPA are reported.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/1572510},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2019},

  month        = {9}

}

Copy to clipboard

Conference:

View Conference

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers

Conference Lumpkin, A. H. ; Rule, D. W.

aThe need for single-shot diagnostics of the periodic longitudinal density modulation of relativistic electrons at the resonant wavelength (microbunching) in a free-electron laser (FEL) or at broadband visible wavelengths as in a laser-driven plasma accelerator (LPA) has been reaffirmed. In the self-amplified spontaneous emission (SASE) FEL case, statistical fluctuations in the microbunching occur in the startup- from-noise process. In the LPA, the plasma itself is chaotic and varies shot to shot. Fortunately, we have shown that coherent optical transition radiation (COTR) techniques, can assess beam size, divergence, spectral evolution, and z-dependent gain (100,000) of microbunched electrons in a past SASEmore »« less
Full Text Available
Observations n Microbunching of electrons in Laser-Driven Plasma Accelerators and Free-Electron

Conference Lumpkin, A. H. ; Rule, D. W. ; LaBerge, M. ; ...

We provide observations on the visible-wavelength microbunching of relativistic electrons at beam energies >200 MeV in both laser-driven plasma accelerators (LPAs) and a self-amplified spontaneous emission (SASE) free-electron laser (FEL). An analytical model for coherent optical transition radiation interferometry (COTRI) addresses both cases. It is noted that the COTR/OTR gain observed in the LPA rivals that of the SASE FEL at saturation, although the few micron transverse sizes of the microbunched beamlets are much smaller than in the FEL. The broadband microbunching observed in the LPA case could act as a seed for a SASE FEL experiment with tunability overmore » the visible regime, in principle.« less
Full Text Available
Observations on Microbunching of Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers

Technical Report Lumpkin, A. H. ; Rule, D. W. ; LaBerge M., LaBerge M. ; ...

The periodic longitudinal density modulation of relativistic electrons at the resonant wavelength ( is a fundamental aspect of free-electron lasers ( FELs).In one case, microbunching fractions reached 20% at saturation of a self-amplified spontaneous emission ( FEL resulting in gains of 1 million at 530 nm .In that experiment the z-dependent gain of coherent optical transition radiation ( was also measured In laser-driven plasma accelerators ( microbunching at visible wavelengths has also been recently reported as evidenced by significant COTR enhancements measured in near-field and far-field images on a single shot for the first time.An analytical model for COTR interferometrymore »« less
https://doi.org/10.2172/1596020

Full Text Available
INTERFEROMETRIC OPTICAL SIGNATURE OF ELECTRON MICROBUNCHING IN LASER-DRIVEN PLASMA ACCELERATORS

Journal Article Lumpkin, A. H. ; LaBerge, M. ; Rule, D. W. ; ... - Phys.Rev.Lett

We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ~200-MeV electrons as they emerge from a laser-plasma accelerator. The divergence of the microbunched portion of electrons, deduced by comparison to an analytical COTRI model, is ~6x smaller than the ~3 mrad ensemble beam divergence, while the radius of the microbunched beam, obtained from COTR images on the same shot, is < 3 microns. The combined results show that the microbunched distribution has estimated transverse normalized emittance ~0.5 mm mrad.
Full Text Available
Coherent Optical Signatures of Electron Microbunching in Laser-Driven Plasma Accelerators

Journal Article Lumpkin, A. H. ; LaBerge, M. ; Rule, D. W. ; ... - Physical Review Letters

We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ~200-MeV electrons as they emerge from a laser-driven plasma accelerator. The divergence of the microbunched portion of electrons, deduced by comparison to a COTRI model, is ~9× smaller than the ~3 mrad ensemble beam divergence, while the radius of the microbunched beam, obtained from COTR images on the same shot, is <3 μm. The combined results show that the microbunched distribution has estimated transverse normalized emittance ~0.4 mmmrad.
https://doi.org/10.1103/PhysRevLett.125.014801

Similar Records