Loading ...
P370 - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
P370 - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom

P370 – PGM I08-SXM DLS

 

Application

Plane grating monochromator (PGM) for soft X-ray synchrotron radiation

Year of delivery

2013

Installation site

Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom

Design Features

  • High-resolution grazing incidence plane grating monochromator (PGM).
  • Spectral range: 250 – 4200 eV.
  • Optical elements: one plane mirror and four plane gratings.
  • Temperature sensors at internal mechanics, mirror and gratings holders.
  • Active water cooling of all optical elements.
  • Water cooled zero-order stop.

  • Mechanically decoupled internal mechanics from the vacuum chamber.
  • Internal mechanics directly connected to the adjustable support structure underneath.
  • Adjustable support structure.
  • Permanently installed bakeout provisions.

Performance Features

  • Very high step resolution.
  • Very high pitch rotation stability and repeatability.
  • Minimized mounting induced deformations.

Outer Dimensions

P370 - Outer dimensions - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom

Technical specifications and performance values

General

Vacuum chamber

Chamber type

cylindrical, vertical axis

Main flanges

at the top

Material

1.4404 (C < 0.02%)

Base pressure

10-10 mbar range

Optical design parameters

Beam height (entrance)

1400 mm

Beam offset

10 mm

Number of plane mirrors

1

Plane mirror dimensions

450 mm x 40 mm x 50 mm

Number of gratings

4

Gratings dimensions

150 mm x 40 mm x 40 mm

Support structure

Adjustment ranges

Vertical translation

± 15 mm

Trasversal translation

± 15 mm

Longitudinal translation

± 15 mm

Pitch

± 1°

Roll

± 1°

Yaw

± 1°

Plane mirror

Pitch rotation

Range

0.66° to -11.55°

Resolution (design value)

0.0036 µrad /motor fine step
(1/64, recommended)
0.0047961 µrad /encoder count

Resolution (measured value)

0.05 µrad

Repeatability

0.11 µrad (pitch)

Translation

Range

55.20 mm

Resolution (design value)

0.0586 µm /motor fine step
(1/256, recommended)
0.05 µm /encoder count

Repeatability

0.09 µrad (pitch)

Gratings

Pitch rotation

Range

0.63° to -11.76°

Resolution (design value)

0.0036 µrad /motor fine step
(1/64, recommended)
0.0047961 µrad /encoder count

Resolution (measured value)

0.05 µrad

Repeatability

0.12 µrad (pitch)

Long-term stability (> 1h)

0.023 µrad

Translation

Range

190.80 mm

Resolution (design value)

0.039 µm /motor fine step
(1/64, recommended)
0.05 µm /encoder count

Repeatability

0.22 µrad (pitch)

Performance Test Results

Pitch deviation after pitch change (mirror)
P370 - Pitch deviation after pitch change (mirror) - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Pitch deviation after pitch change (grating)
P370 - Pitch deviation after pitch change (grating) - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Pitch deviation after mirror translation
P370 - Pitch deviation after mirror translation - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Pitch deviation after grating translation
P370 - Pitch deviation after grating translation - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Mirror pitch positioning resolution
P370 - Mirror pitch positioning resolution - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Grating pitch positioning resolution
P370 - Grating pitch positioning resolution - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Mirror pitch positioning resolution
P370 - Mirror pitch positioning resolution with_without cooling water - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Grating pitch positioning resolution
P370 - Grating pitch positioning resolution with_without cooling water - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Pitch positioning stability vs inlet water pressure
P370 - Positioning resolution_inlet water pressure - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Pitch positioning stability vs cooling water flow rate
P370 - Positioning resolution_Water flow rate - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Grating pitch long-term stability
P370 - Grating pitch long-term stability - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom

Pictures