title: Initial results from an in-vacuum undulator in the NSLS X-ray ring.
abstract: A short-period in-vacuum undulator for the NSLS X-ray Ring has been developed in a collaboration between SPring-8 and the NSLS, and has achieved its project design goals during commissioning studies. The device is called IVUN (in-vacuum undulator) and employs magnet arrays (31 periods, with an 11 mm period) developed at SPring-8, while the requisite vacuum chamber and mechanical systems were developed at the NSLS. At a magnet gap of 3.3 mm, IVUN produces 4.6 keV radiation in the fundamental, with useful photon fluxes in both the second and third harmonics. The magnet gap is adjustable between 2 and 10 mm. A brief overview of IVUN is presented, together with initial commissioning results: the dependence of electron-beam lifetime and bremsstrahlung on magnet gap, and the output radiation spectrum.
authors.affiliation: National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Stefan
authors.forename: T
authors.initials: T
authors.lastname: Tanabe
authors.forename: S
authors.initials: S
authors.lastname: Krinsky
authors.forename: G
authors.initials: G
authors.lastname: Rakowsky
authors.forename: L
authors.initials: L
authors.lastname: Solomon
authors.forename: H
authors.initials: H
authors.lastname: Kitamura