Advanced Photon Source

An Office of Science National User Facility

Beamline Overview

Beamline Layout

Sector 29 - Beamline Information

Source Characteristics
Electromagnetic Variable Polarizing Undulator with Quasiperiodicity Capabilities
Device Length 4.8 m
Undulator Period 12.5 cm
First Harmonic Range
  • 250 to 2500 eV (Horizontal Linear Polarization)
  • 440 to 2500 eV (Vertical Linear Polarization;)
  • 400 to 2500 eV (Left and Right Circular Polarization)
Gap 10.5 mm
Optical Components
Component

Distance from Source

Comment
Mirror (M0) 30.5 m Heat-sink, side bounce
Mirror (M1) 31.3 m Heat-sink, side bounce
Monochromator (M2, MEG, HEG) 39.7 m In-Focus VLS-PGM
Exit Slit 59.7 m Both RSXS and ARPES
Mirror (M3A) 64.3 m Horizontal Focusing (ARPES branch)
Mirror (M4A) 65.1 m Vertical Focusing (ARPES branch)
ARPES focus 66.3 m ~ 30 µm x exit slit size (typically 25 µm)
Mirror (M3R) 43.7 m Horizontal Deflecting and Focusing (RSXS branch)
Mirror (M4R) 64.7 m Vertical Focusing (RSXS branch)
RSXS focus 69.7 m ~ 375 µm x exit slit size (typically 100 µm)
Beam Characteristics
Grating k0 (lines/mm) cff Resolving Power
(E/dE)
Flux (photon/sec) Energy Range (eV)
HEG 2400 4.2 50,000 2 x 10^10 250 - 2,000
MEG 1200 2.2

10,000

2,500

2 x 10^11

2 x 10^9

250 - 2,000

2,000 - 3,000

LEG (to be installed)

400

1.5 2,500 4 x 10^12 250 - 1,900
Experimental Endstations