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The PTB electromagnetic undulator for BESSY II.

R Klein1, J Bahrdt, D Herzog

  • 1Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, D-10587 Berlin, Germany.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary
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The Physikalisch-Technische Bundesanstalt (PTB) introduces a new electromagnetic undulator for radiometry at BESSY II. This device offers a tunable energy range for advanced radiometric applications.

Area of Science:

  • Synchrotron Radiation and Particle Accelerators
  • Metrology and Scientific Instrumentation

Background:

  • The BESSY II storage ring is a key facility for generating synchrotron radiation.
  • Radiometry requires precisely controlled photon sources for accurate measurements.

Purpose of the Study:

  • To present the design and parameters of a novel electromagnetic undulator for radiometric applications.
  • To detail the undulator's tunable energy range and operational modes.

Main Methods:

  • Design and simulation of an electromagnetic undulator with specific period length and magnetic field parameters.
  • Measurement of magnetic field data to validate design specifications.
  • Calculation of the first harmonic tuning range based on undulator parameters and electron beam energy.

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Main Results:

  • The undulator features a period length of 180 mm, 21 periods, and a maximum magnetic induction of 0.46 T.
  • A tuning range of 5 to 150 eV for the first harmonic is achieved at 1.7 GeV electron energy.
  • An alternative mode with a doubled period length (360 mm) shifts the tuning range to lower energies.

Conclusions:

  • The electromagnetic undulator is optimized for radiometry at the BESSY II facility.
  • The dual-mode operation provides flexibility for radiometric measurements across a wider energy spectrum.