A. Crisol, F. Bisti, C. Colldelram, M.L. Llonch, B. Molas, R. Monge, J. Nicolás, L. Nikitina, M. Quispe, L. Ribó, M. Tallarida
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
LOREA beamline (BL20) at ALBA Synchrotron is a new soft X-Ray beamline dedicated to investigate electronic structure of solids by means ARPES technique. Optical design has been developed in-house so as most of beamline core opto-mechanics like Monochromator. The design made for LOREA is based on a Hettrick-Underwood grating type that operates without entrance slit. Experience cumulated over years allowed to face the challenge of designing and building UHV Monochromator. The large energy range of LOREA (10-100 eV) requires a device with 3 mirrors and 4 gratings with variable line spacing to reduce aberrations. Monochromator most important part, gratings system, has been carefully designed to be isolated from external disturbances as cooling water, and at the same time having high performances. Deep analytical calculations and FEA simulations have been carried out, as well as testing prototypes. The most innovative part of Monochromator is gratings cooling with no vacuum guards or double piping that are well-known source of troubles. Heat load is removed by copper straps in contact with a temperature controller device connected to fixed water lines. In addition, motion mechanics and services (cabling, cooling) are independent systems. Designs involved give high stability (resonance modes over 60Hz) and angular resolution below 0.1 µrad over 11° range. On mirrors side, it has been used gonio mechanics from MIRAS* plus an eutectic InGa interface between cooling and optics to decouple them. Grating and mirror holders are fully removable from main mechanics to be able to assembled at lab measuring to achieve the best fit. Instrument has been already assembled and motions characterization or stability measurements are giving expected results matching with specifications. * L. Ribó et al., "MECHANICAL DESIGN OF MIRAS, INFRARED MICROSPECTROSCOPY BEAM LINE AT ALBA SYNCHROTRON", presented at MEDSI’16, Barcelona, Spain, September 2016, doi:10.18429/JACoW-MEDSI2016-FRAA03
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S.P. Kearney, S. Chen, B. Lai, J. Maser, T. Mooney, D. Shu
ANL, Lemont, Illinois, USA
Funding:Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The In Situ Nanoprobe (ISN, 19-ID) beamline will be a new best-in-class long beamline to be constructed as part of the Advanced Photon Source Upgrade (APS-U) project*,**. To achieve long working distance at high spatial resolution, the ISN instrument will be positioned 210 m downstream of the x-ray source, in a dedicated satellite building, currently under construction***. The ISN instrument will use a nano-focusing Kirkpatrick-Baez (K-B) mirror system, which will focus hard x-rays to a focal spot as small as 20 nm, with a large working distance of 61 mm. The large working distance provides space for various in situ sample cells for x-ray fluorescence tomography and ptychographic 3D imaging, allows the use of a separate, independent vacuum chambers for the optics and sample, and provides the flexibility to run experiments in vacuum or at ambient pressure. A consequence of the small spot size and large working distance is the requirement for high angular stability of the KB mirrors (5 nrad V-mirror and 16 nrad H-mirror) and high relative stability between focus spot and sample (4 nmRMS). Additional features include fly-scanning a maximum of a 2 kg sample plus in situ cell at 1 mm/s in vertical and/or horizontal directions over an area of 10 mm x 10 mm. Environmental capabilities will include heating and cooling, flow of fluids and applied fields, as required for electrochemistry and flow of gases at high temperature for catalysis. To achieve these features and precise requirements we have used precision engineering fundamentals to guide the design process. We will discuss in detail the current design of the instrument focusing on the precision engineering used to achieve the stability, metrology, and positioning requirements. * J. Maser, et al. Metal and Mat Trans A (2014) 45: 85. ** J. Maser, et al. Microsc. Microanal. 24 (Suppl 2), 2018. *** S. P. Kearney, et al. Synchrotron Radiat. News Volume 32 (5), 2019.
H.Y. He, L. Kang, L. Liu, R.H. Liu, X.J. Nie, A.X. Wang, L.Q. Zhao
IHEP, Beijing, People’s Republic of China
The construction of the South Advanced Light Source Platform will be completed in 2021. Among them, the high-precision test hall requires that the effective value of the micro-vibration of the foundation be controlled within the vibration range of 25nm, which has already met the requirements of nanometer level. Research at dongguan machinery group, therefore, in view of the high precision testing hall, south of advanced light source is proposed to geological environment factors, carry out detailed geological survey measurement, focus on the advanced light source foundation vibration test, resistance to vibration and vibration characteristics research foundation and anti-vibration scheme research and the advanced light source is the key equipment vibration reduction technology research, through to the light source address of the proposed foundation vibration test, the vibration of foundation design, synchrotron radiation device key equipment comprehensive analysis and research of vibration reduction technology, formed a series of foundation vibration and key equipment solution, for the later construction of the southern light source to lay a solid foundation.
L.R.M. Ribó, D. Alloza, C. Colldelram, J. Nicolás, I. Šics
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
The ALBA optics laboratory has recently acquired a new Zygo Verifire HD Fizeau interferometer. The instrument has been integrated into a positioning stage to allow stitching of long x-ray optical elements. The mechanical set up, with four axes, allows for automatic positioning and alignment of the interferometer aperture to the surface under test. The longitudinal movement allows for scan of X-ray mirrors up to 1500 m long. The positioning platform includes two angles, roll and yaw, and two translations, vertical and longitudinal translations. The longitudinal translation is a custom designed linear stage. The yaw rotation is based on a sine arm mechanism. The vertical and roll motions are combined in a single stage, closely integrated around the main linear stage. The system reaches repeatabilities better than 1 µm or 1 µrad for all axes. The system is mounted on top of a vibration isolated bench in the clean room of the laboratory. The control software of the instrument allow direct control of every individual axis, and allows selecting the center of rotation for both roll and yaw. The system includes inclinometers and autocollimators to control the relative orientation between the interferometer and the mirror under test. The system is integrated to the software of the interferometer, and includes features for automatic alignment of the interferometer to the mirror, or for automatic stitching acquisition, with selectable parameters. The system allows for full three-dimensional characterization of the optical surface of mirrors and gratings, and provides height map reconstructions with accuracy in the order of 1 nm, for flat or curved surfaces with lengths up to 1500 mm.
