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Scientific disciplines: Magnetism, materials science
Endstations:
| GENERAL BEAMLINE INFORMATION |
| Operational |
Yes |
| Proposal cycle |
Proposals for General Sciences Beamlines (6-month cycle) |
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Source characteristics
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5.0-cm period elliptical polarization undulator (EPU5)
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Energy range
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100-2000 eV
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Monochromator
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Variable-included-angle PGM
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Calculated flux (1.9 GeV, 400 mA)
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1 x 1013 photons/s/0.1%BW at 800 eV [Value reported is the merit function, flux = total flux x (degree of circular polarization)2.]
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Resolving power (E/ΔE)
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5,000-10,000 (at source-size limit; energy-dependent)
>25,000 (64 eV, 10-mm entrance/exit slits)
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Special notes
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Polarization is user selectable; linear polarization continuously variable from horizontal to vertical; left and right elliptical (or circular) polarization.
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Local contact
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Advanced Light Source, Berkeley Lab
Phone: (510) 486-4834
Fax: (510) 486-7588
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Advanced Light Source, Berkeley Lab
Phone: (510) 486-5926
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Beamline phone number
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(510) 495-2041
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Website
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http://ssg.als.lbl.gov/ssgdirectory/arenholz/BL402.html
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| ENDSTATION INFORMATION |
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Endstation name
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Eight-pole electromagnet
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Characteristics
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Magnetic fields up to 0.9 T can be applied in any direction relative to the incoming x-ray beam |
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Detectors
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Total electron yield, total fluorescence yield, transmission
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Spot size at sample
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100 micron x 100 micron or larger |
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Samples
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Solid samples
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Sample environment
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10-6 to 10-9 Torr, 15 to 450 K
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Scientific applications
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Spectroscopy on ferro- and antiferromagnetic materials
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Experimental techniques
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XAS, XMCD, XMLD measurements
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| ENDSTATION INFORMATION |
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Endstation name
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XMCD chamber (6T, 2K)
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Characteristics
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6-Tesla superconducting magnet, 2 K sample temperature
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Detectors
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30-element germanium fluorescence detector; sample current
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Spot size at sample
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100 micron x 100 micron or larger
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Samples
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Solids, powders, dried liquid films up to 5 x 5 mm
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Sample environment
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UHV
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Scientific applications
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Spectroscopy on proteins and model compounds, active sites in metalloproteins, enzymatic mechanisms
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Experimental techniques
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XMCD, L-edge spectroscopy
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| ENDSTATION INFORMATION |
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Endstation name
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L-edge chamber with superconducting spectrometer
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Detectors
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Array superconducting tunnel junction fluorescence detector; sample current
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Spot size at sample
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100 micron x 100 micron or larger
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Samples
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Solids, powders, dried up liquid films up to 5 x 5 mm
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Sample preparation
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Proteins dried on Al2O3 disks, often in inert atmosphere; model compounds usually as powder on carbon tape
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Sample environment
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UHV, (10-8 to 10-9 Torr), cooling down to ~15 K possible
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Special notes
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Also analysis of wet and/or air-sensitive samples
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Scientific applications
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Active sites in metalloproteins, enzymatic mechanisms
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Experimental techniques
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Fluorescence-detected absorption spectroscopy
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