LBNL Image Library -- Collection BERKELEY-LAB/RESEARCH-1991-PRESENT/ADVANCED-LIGHT-SOURCE

ALS undulator with star effect

Image File

96904223

Title

ALS undulator with star effect

Description

The 5-cm-period undulators in use at the Advanced Light Source each contain two 4.55-meter-long arrays of permenent magnets with alternating polarity. The arrays are supported by a superstructure capable of resisting the force of their attraction-up to 42 tons (the weight of a 38,000 kg mass). As an electron beam passes throught a vacuum chamber between the arrays, the magnets cause the beam to curve back and forth and thus to produce synchrotron radiation. Undulators produce light brighter than that from other forms of synchrotron radiation sources and with the added characteristics of partial coherence and linear polarization. In this photograph, a strobe light emulates the electron beam.

Date

October 1992

Division

Accelerator and Fusion Research

Site

Berkeley

Research Category

Advanced Light Source

TEID Doc ID

XBD 9609-04223.TIF