Conference Paper

Superbend upgrade at the Advanced Light Source

Lawrence Berkeley Lab., Berkeley, CA, USA
DOI: 10.1109/PAC.2003.1288885 Conference: Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the, Volume: 1
Source: IEEE Xplore

ABSTRACT At the ALS there had been an increasing demand for additional high brightness hard x-ray beamlines in the 7 to 40 keV range. In response to that demand, the ALS storage ring was modified in August 2001. Three 1.3 tesla normal conducting bending magnets were removed and replaced with three 5 Tesla superconducting magnets (Superbends). The radiation produced by these Superbends is an order of magnitude higher in photon brightness and flux at 12 keV than that of the 1.3 Tesla bends, making them excellent sources of hard x-rays for protein crystallography and other hard x-ray applications. At the same time the Superbends do not compromise the performance of the facility in the UV and soft x-ray regions of the spectrum. The Superbend will eventually feed 12 new beam lines greatly enhancing the facility's capacity in the hard x-ray region. The Superbend project is the biggest upgrade to the ALS storage ring since it was commissioned in 1993. In this paper we present a history of the project, as well as the installation, commissioning, and resulting performance of the ALS with Superbends.

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    ABSTRACT: A 4T superconducting wiggler for 1.4GeV synchrotron radiation facility Saga Light Source (SAGA-LS) was developed and manufactured. The wiggler consists of one superconducting magnet as main-pole and two normal conducting magnets as side-poles. The superconducting coils are wound with NbTi wires on iron poles, which are directly cooled by a 2-stage GM cryocooler. The structure of the wiggler is made for compactness and cryogen-free operation. This paper describes its magnet design and manufacturing processes.
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    ABSTRACT: A hybrid three-pole wiggler for generating hard X-rays in the range 4-40 keV was designed for the 1.4-GeV storage ring of a synchrotron radiation facility, i.e., the Saga Light Source. The wiggler consists of a superconducting main pole with a peak field of 4 T and two normal-conducting side poles with peak fields of 1 T. The normal-conducting side poles were used to reduce the heat load on the cryogenic system for the wiggler. A cryogen-free system was used to ensure long-term operational stability of the wiggler system. The superconducting coil and iron poles of the main pole are cooled by a Gifford-McMahon cryocooler via mechanical contact. To suppress the first and second field integrals of the main pole, we designed the main pole with relatively large field clamps and with no transverse return yoke. This pole structure was effective in suppressing beam displacement due to the wiggler field and in reducing the side pole volume. The beam effects due to the multipole fields of the wiggler were estimated and were found to be small or controllable. Based on these results, the storage ring with the designed wiggler is considered to be an effective hard-X-ray source.
    IEEE Transactions on Applied Superconductivity 03/2011; · 1.32 Impact Factor
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    ABSTRACT: Design of a superconducting wiggler is proceeded at synchrotron radiation facility SAGA Light Source. Purpose of the wiggler development is to respond to request of X-ray users in higher photon energy region 20~40keV. The wiggler consists of a main-pole magnet of superconducting magnet (4 T), and two side-poles of normal conducting magnets (1 T) to compensate the beam orbit. Operation stability and maintenance cost were important to decide the wiggler specification. The main pole is directly cooled by a small GM cryocooler and liquid helium is not used for maintenance of superconducting. The main pole was designed to have return yokes along the beam axis to reduce effective field integral.

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