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Journal of Applied Physics / Volume 105 / Issue 5 / PLASMAS AND ELECTRICAL DISCHARGES

J. Appl. Phys. 105, 053304 (2009); http://dx.doi.org/10.1063/1.3075563 (11 pages)

Terahertz laser modulation of electron beams

J. G. Neumann1, R. B. Fiorito1, P. G. O’Shea1, H. Loos2, B. Sheehy2, Y. Shen2, and Z. Wu2

1Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
2National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, USA

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(Received 9 August 2008; accepted 18 December 2008; published online 4 March 2009)

The study of modulated electron beams is important because they can be used to produce coherent radiation, but the modulations can cause unwanted instabilities in some devices. Specifically, in a free electron laser, proper prebunching at the desired emission frequency can enhance performance, while bunching resulting from instabilities and bunch compression schemes can degrade performance. In a photoinjector accelerator, tailoring the shape of the drive laser pulse could be used as a technique to either enhance or mitigate the effect of these modulations. This work explores the possibility of creating deeply modulated electron beams at the photocathode by using a modified drive laser designed to produce multiple subpicosecond pulses repeated at terahertz frequencies. Longitudinal space charge forces can strongly influence the evolution of modulations by converting density modulations to energy modulations. Experiments at the Source Development Laboratory electron accelerator at Brookhaven National Laboratory and PARMELA simulations are employed to explore the dynamics of electron beams with varying charge and with varying initial modulation. Finally, terahertz light generated by a transition radiator is used to confirm the structure of the electron beam.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. DESCRIPTION AND SETUP OF THE DUV-FEL FACILITY
    1. Drive laser
    2. Electron beam diagnostics
    3. Terahertz diagnostics
  3. RESULTS
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

electron beams, free electron lasers, high-speed optical techniques, optical modulation, particle beam bunching, photocathodes

PACS

  • 41.60.Cr

    Free-electron lasers

  • 42.60.By

    Design of specific laser systems

  • 41.75.Fr

    Electron and positron beams

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3075563

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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