Magnetic compton scattering using the elliptical multipole wiggler at sector 11-ID-B

Magnetic Compton scattering has been used to measure the momentum distribut ion of magnetic electrons in several materials. The polarization and freque ncy tunability of the elliptical multipole wiggler (EMW) makes it an ideal source for magnetic Compton scattering experiments. We performed the measur ements using 50, 100 and 150 keV photons simultaneously. The EMW was operat ed at K-y = 14 (E-c = 32 keV) and K-x between 0.6 and 1.03. The degree of c ircular polarization was about 80% or higher. The sample was mounted betwee n the poles of an electromagnet in a field of 0.8 T. The majority of Compto n scattering measurements were performed by switching the magnet polarity. Tests using an iron foil target gave a similar magnetic Compton profile by either switching the magnetic field or the photon helicity. A 9-element Ge solid state detector array was used for detection. (C) 2000 Elsevier Scienc e Ltd. All rights reserved.