Overview of basic parameters:

Undulator: EPU61 with 41.5 periods and a period length of 61 mm.

Energy range: 30-1500 eV

Polarization models: Currently available: horizontal, vertical. Under commissioning: circular

Gratings: Place for 3 gratings. Initially one Au coated 1221 lines/mm and one Ni coated 250 lines/mm gratings are installed. The Ni coated grating offers higher flux in the 200-600 eV range at the expense of resolving power

Energy resolution: Up to R = 10 000. Typically R = 5 000 provided for users

Flux: 10^13 to 10^10 photons/s

Beam spot size: 100 µm x 100 µm at APXPS branch, 5 µm x 25 µm at RIXS branch

Beamline flux curve measured on the APXPS branch BPM diode:

Approximate beamline resolution measured with different gases in the beamline gas absorption cell as well as with XPS in the APXPS endstation.

 M1M2PG1PG2M3 (RIXS)M3 (APXPS)M4 (RIXS)M4 (APXPS)
ShapeCylindricalPlanePlanePlaneToroidalToroidalEllipticalToroidal
DeflectionHorizontal
(towards ring)
Vertical
(up)
Vertical
(down)
Vertical
(down)
Horizontal
(towards ring)
Horizontal
(away from ring)
Horizontal
(towards ring)
Horizontal
(away from ring)
Size (h x v) mm^2210x20520x50120x40120x40240x30230x30250x40250x40
Clear aperture170x15500x20110x30110x30220x20220x20240x20240x20
CoatingAuAuAuNiAuAuAuAu
Slope error (arc sec)1/0.30.1/0.10.1/0.10.1/0.11/0.31/0.35/11/0.3
Entrance arm (mm)12000/-infinity/15300infinity/15300113004500/infinity
Exit arm (mm)infinity/-7000/75007000/infinity7001562/1500
Groove density1221250
Blaze angle1.71.7