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Related Experiment Videos

High-gradient millimeter-wave accelerator on a planar dielectric substrate.

M E Hill1, C Adolphsen, W Baumgartner

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. marc@physics.harvard.edu

Physical Review Letters
|September 5, 2001
PubMed
Summary

Researchers tested a new planar dielectric accelerator, achieving high gradients of 20 MeV/m without breakdown. This study also presents the first measurement of quadrupolar content in an accelerating mode for millimeter-wave accelerators.

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Area of Science:

  • Physics
  • Accelerator Physics
  • Materials Science

Background:

  • Millimeter-wave accelerators are crucial for future high-energy physics.
  • Dielectric structures offer potential for high-gradient acceleration.
  • Previous studies lacked high-gradient data for dielectric accelerators.

Purpose of the Study:

  • To perform the first high-gradient studies on a planar dielectric accelerator.
  • To evaluate the performance and breakdown limits of dielectric structures at millimeter-wave frequencies.
  • To measure the quadrupolar content of an accelerating mode.

Main Methods:

  • Utilized a planar dielectric accelerator powered by a 0.5-A, 300-MeV drive electron beam at 11.424 GHz (8th harmonic, 91.392 GHz).
  • Embedded the structure in a ring-resonator circuit within the electron beam line vacuum.

Related Experiment Videos

  • Operated the accelerator at 20 MeV/m with 200 kW circulating power for 2 x 10^5 pulses.

    • Main Results:

    • Achieved stable operation at 20 MeV/m without dielectric breakdown, charging, or other high-gradient issues.
    • Demonstrated the viability of planar dielectric structures for high-gradient millimeter-wave acceleration.
    • Successfully measured the quadrupolar content of an accelerating mode for the first time.

    Conclusions:

    • Planar dielectric accelerators are a promising technology for future high-gradient accelerators.
    • The demonstrated performance indicates robustness against high-gradient phenomena.
    • The measurement of quadrupolar content provides valuable insights into accelerator mode dynamics.