Suite of three protein crystallography beamlines with single superconducting bend magnet as the source

Journal Article · Sun Aug 01 00:00:00 EDT 2004 · Journal of Synchrotron Radiation

DOI:https://doi.org/10.1107/S0909049504024835· OSTI ID:835362

MacDowell, Alastair A; Celestre, Richard S; Howells, Malcolm; McKinney, Wayne; Krupnick, James; Cambie, Daniella; Domning, Edward E; Duarte, Robert M; Kelez, Nicholas; Plate, David W; Cork, Carl W; Earnest, Thomas N; Dickert, Jeffery; Meigs, George; Ralston, Corie; Holton, James M; Alber, Thomas; Berger, James M; Agard, David A; Padmore, Howard A

At the Advanced Light Source (ALS), three protein crystallography (PX) beamlines have been built that use as a source one of the three 6 Tesla single pole superconducting bending magnets (superbends) that were recently installed in the ring. The use of such single pole superconducting bend magnets enables the development of a hard x-ray program on a relatively low energy 1.9 GeV ring without taking up insertion device straight sections. The source is of relatively low power, but due to the small electron beam emittance, it has high brightness. X-ray optics are required to preserve the brightness and to match the illumination requirements for protein crystallography. This was achieved by means of a collimating premirror bent to a plane parabola, a double crystal monochromator followed by a toroidal mirror that focuses in the horizontal direction with a 2:1 demagnification. This optical arrangement partially balances aberrations from the collimating and toroidal mirrors such that a tight focused spot size is achieved. The optical properties of the beamline are an excellent match to those required by the small protein crystals that are typically measured. The design and performance of these new beamlines are described.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic Energy Sciences. Materials Science and Engineering Division; National Science Foundation (NSF); Howard Hughes Medical Institute, Henry Wheeler (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 835362
• Report Number(s): LBNL-56285; R&D Project: A580ES; TRN: US0500024
• Journal Information: Journal of Synchrotron Radiation, Vol. 11; Other Information: Submitted to Journal of Synchrotron Radiation, Volume 11; Journal Publication Date: 2004; PBD: 1 Aug 2004
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
47 OTHER INSTRUMENTATION
59 BASIC BIOLOGICAL SCIENCES
ADVANCED LIGHT SOURCE
BENDING
BRIGHTNESS
CRYSTALLOGRAPHY
DESIGN
ELECTRON BEAMS
ILLUMINANCE
MAGNETS
MIRRORS
MONOCHROMATORS
OPTICAL PROPERTIES
OPTICS
PERFORMANCE
PROTEINS
X-RAY BEAMLINE PROTEIN CRYSTALLOGRAPHY SUPERBEND INVAR MIRROR DOUBLE CRYSTAL MONOCHROMATOR.