BL11-2

Overview

Beam line 11-2 is a high-flux XAS end-station dedicated to radiological, geochemical, and surface/interfacial science. It is optimized for challenging XAS measurements on dilute or radioactive samples, surfaces, and interfaces. To support these experiments, BL11-2 is equipped with collimating and focusing optics, a "double double" Si(220) LN2-cooled monochromator, and a 100-pixel monolithic solid state Ge detector array. Additional instrumentation includes LHe and LN2 cryostats, a grazing incidence XAS spectrometer, and HEPA-filtered controlled exhaust systems that are continuously monitored to detect the presence of air-born radioactivity. It has an adjacent sample preparation room for handling and temporary storage of radioactive samples. BL11-2 can accommodate samples containing uranium and other radionuclides, depending upon their radiotoxicity level, activity, shielding requirements, and complexity of the experimental requirements.

 

Source —

26-pole, 2.0-Tesla Wiggler, ≤1.5 mrad variable acceptance

Status —

Operational

Beamline Parameters —

Energy Range Resolution ΔE/E Spot Size Flux
Focused 5500-22000 eV 1 x 10-4 50 x 800 µm2 2 x 1012 ph/sec
Unfocused 5500-37000 eV 1 x 10-4 2 x 12 mm2 2 x 1012 ph/sec

Optics —

M0 Mirror M1 Mirror Monochromator
1-meter Rh coated Si vertically collimating mirror. 1-meter Rh coated Si cylindrical focusing mirror, ~1:1 focusing Si(220), ϕ = 0o & 90o. double-crystal, variable-exit geometry

Instrumentation —

Detectors Canberra 100-element monolithic germanium solid-state detector with XIA
Xmap electronics
Passivated implanted planar silicon (PIPS) semiconductor detector
Ionization chambers
Lytle Detector
Ancillary Soller slits and positioners
Turbo-pump carts
Biologic potentiostat
Multiple motorized sample positioners
In-hutch HEPA filtered exhaust snorkel
CAM monitors for radiological samples

Sample Environment —

Standard Purged polycarbonate standard sample box with motorized multi-sample positioner capable of mounting sample plates listed below:
  • Single solid sample
  • 4-slot and 8-slot solid sample cassette
     
Non-Standard Unfocused -
LN2 cryostat with 8-slot sample holder
LHe cryostat with single liquid and solid sample holders

Focused – GIXAS -
Solid-liquid interface electrochemical cells
Solid-gas heated electrochemical cells (max temp ~250 °C)
Anton-Paar DHS 1100 Domed Hot Stage

For radioactive samples (RAM), refer to:
http://www-ssrl.slac.stanford.edu/content/safety/radioactive-materials-ssrl
Radioactive sample contact person:
Matt Padilla: mpadilla@slac.stanford.edu
Data Acquisition and Analysis
  • WebXAS
  • EXAFSPAK
  • SIXPack
  • Athena


BL 11-2

Publications

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Science Highlights

We are in the process of porting over science highlights from our previous system. You can access new highlights and a portion or our catalog here. 

For science highlights dated before 2021 visit this site. Use the filters to narrow down your search by year and beam line.