A. Andersson et al., EXPERIENCES WITH THE NARROW-GAP UNDULATOR AT MAX-LAB, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 362(2-3), 1995, pp. 586-591
An undulator with short poles (period 24 mm) and extremely narrow gap
(magnet gap 7.7 mm) using a squeezable vacuum chamber has been install
ed and is in operation at the MAX-lab 550 MeV storage ring. The device
operates with a vacuum chamber aperture down to 6.2 mm. The behaviour
of the storage ring concerning lifetime, emittance, tune shift and cl
osed orbit is well described by conventional models. We present here t
he design of the device, the influence on the storage ring and the spe
ctral characteristics, as well as comparison with expected theoretical
results and an overview of the activities at the beam line.