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P429 - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
P429 - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA

P429 – Mirror Unit SIX NSLS-II

Application

Mirror unit (M3) for soft X-ray synchrotron radiation

Year of delivery

2015

Installation site

SIX beamline at the synchrotron radiation source NSLS-II, USA

The constant-strut-length hexapod design used in this soft X-ray deflecting mirror unit is adapted from that of the EMIL beamlines hexapods (see projects P405 to P412). This mirror unit is part of the SIX beamline, dedicated to high resolution soft X-ray scattering experiments. Energy resolution and pointing stability are here of crucial importance.

Design Features

  • Constant-strut-length hexapod mechanism.

  • Six degrees of freedom and selectable rotation center.
  • Spectral range: 150 – 2000 eV.
  • Optical elements: one focusing mirror.

  • Indirect cooling of the mirror with copper braids.

  • Electrode in front of each mirror surface.
  • Temperature sensors at mirror holder and chin guard.
  • Permanently installed bakeout provisions.
  • Adjustable support structure.

Performance Features

  • High positioning resolution (minimum incremental motion).
  • High stability and repeatability for all degrees of freedom.
  • Minimized mounting induced deformations.

Outer Dimensions

P429 - Outer dimensions - P429 - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA

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

1419.25 mm

Number of mirrors

1

Surface shape

elliptical cylinder

Mirror dimensions

410 mm x 50 mm x 50 mm

Actuator drives for hexapod axes

Resolution (design value)

0.004 µm /motor fine step
(1/128, recommended)
0.005 µm /encoder count

Mirror mechanics

Pitch rotation

Range

± 10 mrad

Resolution (measured value)

0.05 µrad

Repeatability

0.09 µrad (pitch)

0.14 µrad (roll)

Long-term stability (6h)

0.05 µrad

Roll rotation

Range

± 40 mrad

Resolution (measured value)

0.05 µrad

Repeatability

0.18 µrad (pitch)

0.06 µrad (roll)

Lateral translation

Range

-18 mm to +10 mm

Repeatability

1 µm

Performance Test Results

Pitch deviation after pitch change
P429 - Pitch deviation after pitch change - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
Roll deviation after pitch change
P429 - Roll deviation after pitch change - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
Pitch deviation after roll change
P429 - Pitch deviation after roll change - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
Roll deviation after roll change
P429 - Roll deviation after roll change - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
Mirror pitch positioning resolution
P429 - Mirror pitch positioning - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
Mirror pitch long-term stability
P429 - Mirror pitch stability - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA
Residual gas analysis
P429 - Residual gas analysis - Mirror unit (M3) for soft X-ray synchrotron radiation at SIX beamline at the synchrotron radiation source NSLS-II, USA

Pictures