EXPERIMENTAL STATION 4-2

CURRENT STATUS:	Beam line is closed for upgrade and expected to be available in 2008
SUPPORTED TECHNIQUES:	Macromolecular solution x-ray scattering Biological Small Angle X-ray Scattering/Diffraction Lipid membrane diffraction Fiber diffraction Time-resolved x-ray scattering/diffraction Small-angle single crystal diffraction Ultra small-angle x-ray scattering (under development)
MAIN SCIENTIFIC DISCIPLINES:	Biology
% TIME GENERAL USE:	100%
SCHEDULING:	see Proposal Submittal and Scheduling Procedures
SOURCE:	20-pole, 2.0-Tesla Wiggler ID End Station
BEAM LINE SPECIFICATIONS:   energy range grating type resolution DE/E spot size flux angular acceptance focused (crystal) 6000-17000 eV ~5 x 10-4 0.2 x 1.0mm   .0.1 - 1.5 mrad focused (multilayers) 8000-12000 eV ~3 x 10-2 0.2 x 1.0mm   .1 - 2.0 mrad
OPTICS:	Bent cylinder mirror, silicon, Rh-coated Radii: 15.4m vertical (adjustable) x 57mm horizontal Mean angle of incidence: 3.8mrad Cut off energy: 17.5keV Magnification: 1.0
MONOCHROMATOR:	Parallel crystal geometry Si(111), Mo/B4C multilayers Upward reflecting liquid nitrogen-cooled monochromator (same as other insertion device hard x-ray stations)
ANGULAR RANGE:	Distance(m)   Typical Q (2ps) Range(Å-1) 0.25   0.045 - 3.6 0.45 0.024 - 2.2 0.65 0.017 - 1.6 1.10 0.010 - 1.0 1.65 0.0068 - 0.67 2.40 0.0045 - 0.46 3.40 0.0034 - 0.33 E=11keV, 4mm circular beam stop assumed
INSTRUMENTATION:	Please refer to http://ssrl.slac.stanford.edu/~saxs
DATA ACQUISITION AND ANALYSIS:	Data acquisition: Blu-ice, HiPic see: http://www-ssrl.slac.stanford.edu/~saxs/daq/daq.htm Data analysis: MarParse, fit2D see: http://www-ssrl.slac.stanford.edu/~saxs/daq/daq.htm
RESPONSIBLE STAFF:	Hiro Tsuruta, 650-926-3104 (office) Thomas Weiss, 650-926-4078 (office)
BEAM LINE PHONE NUMBER:	650-926-5242
GENERAL DESCRIPTION:	BL4-2 is a small-angle scattering station dedicated to structural biology studies primarily on non-crystalline systems. The 20-pole wiggler in combination with the multilayer monochromator provide high brilliance x-ray beam for time-resolved studies down to milliseconds. This facility covers the range of characteristic length scale of 3.6 Å to a few micrometers by the combined use of a pin-hole geometry camera, which can be automatically configured to have one of 7 sample-to-detector distances, and a separate ultra small angle scattering setup. A Rayonix MX225-HE detector is our primary detector. A Hamamatsu image-intensified CCD detector system is used for fast time-resolved studies. The facility provides a large selection of sample handling devices, such as stopped- flow rapix mixers, capillary flow cells and automated sample change for solution scattering.
SCIENTIFIC APPLICATIONS / SELECTED RESULTS:	February 2008: Scientists Decipher Mechanism behind Antimicrobial "Hole Punchers" October 2007: Untangling a Sticky Situation to Save Lives September 2007: Steps Toward Understanding Autism July 2007: Floppy Hairs and Sound Waves July 2007: Structural Polymorphism of the Actin-Espin System: A Prototypical System of Filaments and Linkers in Sterocilia October 2006: Physicists Discover a New Structure of Cationic Lipid-DNA Complexes for Gene Theraphy March 2006: Polymorphism of DNA-anionic Liposome Complexes Reveals Hierarchy of Ion-mediated Interactions October 2005: Cationic Liposome-Microtubule Complexes: Lipid-Protein Bio-Nanotubes with Open or Closed Ends January 2005: Higher Order Assembly of Microtubules by Counter-ions: From Hexagonal Bundles to Living Necklaces
ENGINEERING NOTES:	http://www-ssrl.slac.stanford.edu/safety/ beamlines/bl4/

SSRL | Beamlines | User Admin | Safety

Last Updated:	22 JUL 2008
Content Owner:	Hiro Tsuruta
Page Editor:	Nikola Stojanovic