Abstract
A report on a four-axis ultra-high-stability manipulator developed for use at the Veritas and Species RIXS beamlines at MAX IV Laboratory, Lund, Sweden, is presented. The manipulator consists of a compact, light-weight X-Y table with a stiffened Z tower carrying a platform with a rotary seal to which a manipulator rod holding the sample can be attached. Its design parameters have been optimized to achieve high eigen-frequencies via a light-weight yet stiff construction, to absorb forces without deformations, provide a low center of gravity, and have a compact footprint without compromising access to the manipulator rod. The manipulator system can house a multitude of different, easily exchangeable, manipulator rods that can be tailor-made for specific experimental requirements without having to rebuild the entire sample positioning system. It is shown that the manipulator has its lowest eigen-frequency at 48.5 Hz and that long-term stability is in the few tens of nanometres. Position accuracy is shown to be better than 100 nm. Angular accuracy is in the 500 nrad range with a long-term stability of a few hundred nanoradians.
Highlights
Veritas and Species are two resonant inelastic X-ray scattering (RIXS) beamlines at MAX IV Laboratory, Lund, Sweden, that operate in the energy range 30–1500 eV (Sathe et al, 2020; Urpelainen et al, 2017; Sjoblom et al, 2020)
RIXS is a technique used in a broad range of applications (Schmitt et al, 2014; Rubensson, 2015; Rubensson et al, 2013; Nordgren & Rubensson, 2013) but in recent years the use of RIXS in the study of correlated materials has led to an expansive build up of high-resolution soft X-ray RIXS beamlines world wide (Schmitt et al, 2013; Brookes et al, 2018; Diamond Light Source, 2020; Jarrige et al, 2018; Dvorak et al, 2016), where the main focus has been the study of solid samples
At MAX IV, the stated goal of the RIXS beamlines has been to offer as wide sample capabilities as possible to cater to a broad community of users
Summary
Veritas and Species are two resonant inelastic X-ray scattering (RIXS) beamlines at MAX IV Laboratory, Lund, Sweden, that operate in the energy range 30–1500 eV (Sathe et al, 2020; Urpelainen et al, 2017; Sjoblom et al, 2020). High-stability sample manipulation has been achieved using in-vacuum goniometers (ESRF, 2020) or hexapods (PhysicInstrumente, 2020) with stacked motion tables sharing a common center point where the sample can be mounted Systems of this design are usually quite bulky, limiting both the sample volume and accessibility. The final unibody design concept, with a back plate for the vertical motion, on the other hand permits free access to the top of the Z-platform in a 190 arc, regardless of X, Y and Z positions This limits the angular stroke to a 190 arc if parts of the sample rod assembly protrude outside the rotation radius of 63 mm. Should the manipulator itself need to be removed, an integrated balance-block can be adjusted on the lifting arm so that it always hangs in a true vertical position
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