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Proceedings Paper

Adjustable phase planar helical undulator
Author(s): Roger G. Carr; Steve Lidia
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Paper Abstract

We present here the design description of a new type of planar helical undulator, which we are constructing for the SPEAR storage ring at the Stanford Synchrotron Radiation Laboratory. It comprises four rows of pure permanent magnet blocks, one row in each quadrant about the axis defined by the electron beam. Rows may be translated longitudinally with respect to each other to change the helicity of the magnetic field they create at the position of the beam. They may also be translated longitudinally to vary the energy of the x-rays emitted, unlike designs where this function is performed by varying the gap between the rows. This work includes numerical calculations of the fields, electron trajectories, and x-ray spectra, including off-axis effects.

Paper Details

Date Published: 29 November 1993
PDF: 12 pages
Proc. SPIE 2013, Electron-Beam Sources of High-Brightness Radiation, (29 November 1993); doi: 10.1117/12.164806
Show Author Affiliations
Roger G. Carr, Stanford Synchrotron Radiation Lab. (United States)
Steve Lidia, Lawrence Berkeley Lab. (United States)


Published in SPIE Proceedings Vol. 2013:
Electron-Beam Sources of High-Brightness Radiation
Henry P. Freund, Editor(s)

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