EXPERIMENTAL STATION 5-4

CURRENT STATUS:	Open
SUPPORTED TECHNIQUES:	Very High Energy Resolution; Photoemission Angle-Resolved Photoelectron Spectroscopy
MAIN SCIENTIFIC DISCIPLINES:	Materials
% TIME GENERAL USE:	100%
SCHEDULING:	Proposal Submittal and Scheduling Procedures Current SPEAR and Beam Line Schedules
SOURCE:	10-period undulator, maximum field 0.61 T
BEAM LINE SPECIFICATIONS:   energy range grating type resolution DE/E spot size flux angular acceptance focused 7-40 eV 1700 l/mm: 7-18 eV, E/DE > 10000 2800 l/mm: 16-32 eV, E/DE> 10000 3600 l/mm: 20-40 eV, E/DE> 10000 ≥1 x 10-4 0.5 x  0.6 mm2 ~1011 >1.5 mrad
OPTICS:	M0: horizontal deflecting, flat, water-cooled M1: vertical focusing 10:1, elliptically cylinder M3: horizontal refocusing 1:1, cylinder M4: vertical refocusing 1:1, cylinder
MONOCHROMATOR:	Normal Incidence Monochromator (NIM)
ABSORPTION:	NA
INSTRUMENTATION:	SCIENTA R4000 Electron Analyzer Low-temperature Manipulator Low Energy Electron Diffraction
DATA ACQUISITION AND ANALYSIS:	BL5-4 Precautions, Paramaters, Manipulations and Instruction links SCIENTA
RESPONSIBLE STAFF:	Donghui Lu, 650-926-3026 Hashimoto Makoto, 650-926-5126
BEAM LINE PHONE NUMBER:	650-926-5254 On-site Users: Contact the Duty Operator at 9-926-4040
GENERAL DESCRIPTION:	The BL5-4 station is a normal incidence monochromator beam line optimized for high-resolution angle-resolved photoemission spectroscopy (ARPES) in the photon energy range of 10-40 eV. The dedicated experimental end station is equipped with a SCIENTA R4000 electron spectrometer operating in the parallel multi-angle recording mode. In conjunction with the normal incidence monochromator, this system is capable of performing ARPES experiments with a total energy resolution of a few meV and an angular resolution of 0.3°. The experimental end station consists of two chambers: a sample preparation chamber together with LEED and a spectroscopy analysis chamber. Both chambers are kept under UHV throughout the experiments with a base pressure better than 3x10-11 torr. It is also equipped with a low-temperature sample manipulator with two degree of freedom of rotation, which can be cooled down to 10 K. See video on the role of aluminum foil in vacuum chamber 'bakeouts.'
SCIENTIFIC APPLICATIONS / SELECTED RESULTS:	August 2010: Topological Insulators Take Two Steps Forward April 2010: Scientists Find Unexpected Electron Behavior in the Pseudogap of High-temperature Superconductors September 2009: Yulin Chen Receives Spicer Young Investigator Award,   July 2009: Three Research Grants and a New Branchline for SIMES and SSRL    March 2009: Macroscopic Quantum Insulator State Observed October 2008: A New Type of Superconductor July 2008: New Mechanism Identified for Charge Density Wave Formations January 2008: Unique SSRL-Stanford Collaboratioan Illuminates Rare Materials November 2007: Bridging the Gaps of High-Tc Superconductor January 2007: Pseudogap and Superconducting Gap in High-Temperature Superconductors March 2005: From Mott Insulator to High-Tc Superconductor See Review Paper "Photoemission spectroscopy - from early days to recent applications, New Journal of Physics 2005 July 2001: Complex Materials Research by Angle-Resolved Photoemission Spectroscopy
ENGINEERING NOTES:	March 18, 2010: Taming the Superconductor    http://www-ssrl.slac.stanford.edu/beamlines/BL5-4/BL5-4_engr_notes.pdf http://www-ssrl.slac.stanford.edu/safety/beamlines/bl5/

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Last Updated:	28 JAN 2011
Content Owner:	Donghui Lu
Page Editor:	Nikola Stojanovic