Source sizes calculated for normal running condition plus a calculator.

The emittance and coupling for the most common running condition (lower-emittance) are 2.5 nm-rad and 0.01, respectively. The values may vary during the run as the undulator gaps settings change, and we make more accurate determination of beam parameters at the diagnostics beamline source point.

As-measured emittance value of 2.5 nm-rad, coupling 0.01
Element Name	Sigmax (um)	Sigmaxp (urad)	betax (m)	alphax	gammax (1/m)	etax (m)	etaxp
ID	275.3	11.3	19.5	0	0.05	0.172	0
Moved BM	91.6	56.4	2.12	0.97	0.91	0.058	-0.031
Unmoved BM	88.7	56.5	2.00	0.91	0.91	0.056	-0.032
Element Name	Sigmay (um)	Sigmayp (urad)	betay (m)	alphay	gammay (1/m)
ID	8.5	3.0	2.87	0	0.35
Moved BM	25.5	1.1	25.97	0.59	0.05
Unmoved BM	25.8	1.2	26.54	0.75	0.06

(The gamma columns are not the relativistic factor but a function related to divergence of the distribution)

Moved and unmoved BM refers to BM source points in sectors that have the new "Decker" alignment and the sectors with the original alignment. All BM source points are moved except for 14BM. The ID source point parameters are unaffected by the Decker alignment. To generate beam parameters for a particular emittance and coupling condition use the following calculator.

Calculate beam parameters:
Emittance
Coupling
Lower emittance lattice (lattice since 2002)

We have run with a coupling of 1.5% and 2.0% in the past.