Coherent Smith-Purcell radiation as a diagnostic for sub-picosecond electron bunch length

Title: Coherent Smith-Purcell radiation as a diagnostic for sub-picosecond electron bunch length

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Abstract

We suggest a novel technique of measuring sub-picosecond electron bunch length base on coherent Smith-Purcell radiation (SPR) emitted when electrons pass close to the surface of a metal grating. With electron bunch lengths comparable to the grating period, we predict that coherent SPR will be emitted at large angles with respect to direction of beam propagation. As the bunch length shortens, the coherent SPR will be enhanced over the incoherent component that is normally observed at small angles. Furthermore, the angular distribution of the coherent SPR will be shifted toward smaller angles as the bunch length becomes much smaller than the grating period. By measuring the angular distribution of the coherent SPR, one can determine the bunch length of sub-picosecond electron pulses. This new technique is easy to implement and appears capable of measuring femtosecond electron bunch lengths.

Authors:: Nguyen, D C

Publication Date:: 1996-10-01

Research Org.:: Los Alamos National Lab., NM (United States)

Sponsoring Org.:: USDOE, Washington, DC (United States)

OSTI Identifier:: 389073

Report Number(s):: LA-UR-96-3231; CONF-9608133-4
ON: DE97000135; TRN: 96:029103

DOE Contract Number:: W-7405-ENG-36

Resource Type:: Conference

Resource Relation:: Conference: 18. international free electron laser conference and 3. FEL Users` workshop, Rome (Italy), 25-30 Aug 1996; Other Information: PBD: [1996]

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; 66 PHYSICS; ELECTRON BEAMS; PULSES; BEAM BUNCHING; BEAM PULSERS; DIAGNOSIS; COHERENT RADIATION; DIFFRACTION GRATINGS

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                    Nguyen, D C. Coherent Smith-Purcell radiation as a diagnostic for sub-picosecond electron bunch length.  United States: N. p., 1996. 
        Web.

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                    Nguyen, D C. Coherent Smith-Purcell radiation as a diagnostic for sub-picosecond electron bunch length.  United States.

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                    Nguyen, D C. Tue .  
        "Coherent Smith-Purcell radiation as a diagnostic for sub-picosecond electron bunch length".  United States.  https://www.osti.gov/servlets/purl/389073.

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@article{osti_389073,

  title        = {Coherent Smith-Purcell radiation as a diagnostic for sub-picosecond electron bunch length},

  author       = {Nguyen, D C},

  abstractNote = {We suggest a novel technique of measuring sub-picosecond electron bunch length base on coherent Smith-Purcell radiation (SPR) emitted when electrons pass close to the surface of a metal grating. With electron bunch lengths comparable to the grating period, we predict that coherent SPR will be emitted at large angles with respect to direction of beam propagation. As the bunch length shortens, the coherent SPR will be enhanced over the incoherent component that is normally observed at small angles. Furthermore, the angular distribution of the coherent SPR will be shifted toward smaller angles as the bunch length becomes much smaller than the grating period. By measuring the angular distribution of the coherent SPR, one can determine the bunch length of sub-picosecond electron pulses. This new technique is easy to implement and appears capable of measuring femtosecond electron bunch lengths.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/389073},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1996},

  month        = {10}

}

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