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P435 - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
P435 - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH

P435 – Mirror Unit SXR XFEL PAL

Application

Mirror unit (M1) for soft X-ray synchrotron radiation

Year of delivery

2016

Installation site

Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea

This mirror unit for the soft X-ray beamline at the Korean XFEL features a cardanic mount to realize the required degrees of freedom. B4C beam blocking provisions are integrated in the system.

Design Features

  • In-UHV stacked design for the requested degrees of freedom.

  • XFEL compatible.

  • Spectral range: 270 – 1300 eV.
  • Pitch rotation stage motorized and encoded in-UHV.
  • Roll rotation guidance system motorized and encoded in-UHV.
  • Linear stage for mirror horizontal translation motorized and encoded in-air.
  • Temperature sensor at pitch stage.
  • Electrode at mirror surface for carbon contamination prevention.
  • Active water cooling of the mirror.
  • Motion control system with EPICS interface.

  • Adjustable support structure.
  • Permanently installed bakeout provisions.

Performance Features

  • High positioning resolution (minimum incremental motion).
  • High pitch rotation stability and repeatability.
  • Minimized mounting induced deformations.

Outer Dimensions

P435 - Outer dimensions - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH

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

1400 mm

Number of mirrors

1

Surface shape

plane

Mirror dimensions

600 mm x 50 mm x 50 mm

Mirror mechanics

Pitch rotation

Range

± 5 mrad

Resolution (design value)

0.036 µrad /motor step
0.0067 µrad /encoder count

Resolution (measured value)

0.05 µrad

Repeatability

0.11 µrad (pitch)

0.15 µrad (roll)

Long-term stability (> 30 minutes)

0.016 µrad

Roll rotation

Range

± 10 mrad

Resolution (design value)

0.068 µrad /motor step
0.0067 µrad /encoder count

Resolution (measured value)

0.10 µrad

Repeatability

0.05  µrad (pitch)

0.16 µrad (roll)

Long-term stability (> 30 minutes)

0.023 µrad

Translation
along surface normal

Range

± 10 mm

Resolution

0.30 µm /motor step
0.05 µm /encoder count

Repeatability

0.06 µrad (pitch)

0.13 µrad (roll)

Performance Test Results

Pitch deviation after pitch change
P435 - Pitch deviation after pitch change - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Roll deviation after pitch change
P435 - Roll deviation after pitch change - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Pitch deviation after roll change
P435 - Pitch deviation after roll change - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Roll deviation after roll change
P435 - Roll deviation after roll change - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Pitch deviation after mirror translation
P435 - Pitch deviation after mirror translation - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Roll deviation after mirror translation
P435 - Roll deviation after mirror translation - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Mirror pitch positioning resolution
P435 - Mirror pitch positioning - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Mirror pitch long-term stability
P435 - Mirror pitch stability - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Mirror roll positioning resolution
P435 - Mirror roll positioning - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Mirror roll long-term stability
P435 - Mirror roll stability - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH
Residual gas analysis
P435 - Residual gas analysis - Mirror unit (M1) for soft X-ray synchrotron radiation at Soft X-ray beamline (XFEL) at Pohang Accelerator Laboratory, South Korea, 2016 - Bestec GmbH

Pictures