Table 1. Comparison of flux densities for selected XAS beamlines^† at 10 keV.

Beamline	Flux density (photons s−1 mm−2)	Aperture (V × H) (mm)	Current (mA)	GeV
SSRL 9-3‡	1.7 × 1012	0.4 × 3	100§	3
SSRL 7-3	3.3 × 1010	2 × 15	100§	3
AS XAS (focused)	3.3 × 1014	0.1 × 0.3	200	3
AS XAS (defocused)	1.0 × 1013	0.5 × 2	200	3
PF ANBF	5.0 × 109	2 × 10	450	2.5
APS 20BMB (focused)	1.0 × 1012	0.2 × 0.5	100	7
APS 20BMB (unfocused)	2.0 × 109	1 × 10	100	7
APS 20ID (microfocus)¶	4.0 × 1016	0.005 × 0.005	100	7
ESRF ID24	1.7 × 1014	0.03 × 0.2	100	6
CLS BioXAS (focused)††	3.4 × 1014	0.05 × 0.3	250	2.9
CLS BioXAS (defocused)††	5.0 × 1012	0.5 × 2	250	2.9
LNLS XAFS2	5.0 × 109	2 × 10	450	2.5

^†This table is not intended to provide a comprehensive review of beamlines.

^‡Recent flux data for SSRL 9-3 are not available because this beamline is currently under repair.

^§SSRL now routinely operates at 450 mA and fluxes are expected to approximately scale accordingly.

^¶We note that APS 20ID is not a standard XAS beamline. It is included here to illustrate the remarkably high flux densities that can be available on state-of-the-art third-generation infrastructure.

^††Calculated values presented as the CLS BioXAS beamlines are not yet operational.