Shown in cross-section:

• 12.8 cm period
• 500-3000 eV output
• circular polarization, both left and right
• linear polarization, both vertical and horizontal
• switchable polarization
• compatible with standard ID vacuum chamber, so it can share a straight section
• open along one side for access by magnetic measurement probes
• upgraded in Fall 2009 with vanadium permendur poles for horizontal field