Energy Modulator Specifications

Energy Modulation Wiggler Parameters (The NSLS Mini-Undulator)

Parameter Unites Value Notes
Period mm 80
Number of Periods   10
Peak Field T 0.35 max
K   2.3 max
Minimum Gap 31 mm original design
Overall Length m 0.8
Clear Aperature mm 25 original design

The Mini-Undulator is a Rare Earth Permanent Magnet Hybrid Undulator using SmCo5 magnet material and steel poles. The device was originally built by the NSLS in 1986 as a scaled prototype for the X-1A undulator. The limited number of poles was used to keep the maximum heatload within the capabilities of the Phase-I x-ray ring exit chambers. It was installed as X-17T (T for testbed) where it provided one of the earliest soft x-ray undulator sources for microscopy and spectroscopy. After the Phase II shutdown it was moved to X-13 as an R&D source, then removed and used as the energy modulator for the HGHG experiment in the infra-red at the ATF in 1999 and 2000. This venerable and productive device will be moved to the SDL and refitted with a modified gap separation mechanism to serve as the energy modulator for the DUV-FEL in early 2001.