Embedded Files
Monoplus –
The Monoplus project is about the development of adaptive optics in a grating monochromator at a soft x-ray beamline in order to compensate for residual phase errors and enable high-speed X-Ray Magnetic Circular Dichroism.
For this, we developped a set of simulations to determine the feasibility, we designed a soft x-ray photon energy (PhEnSe) that we have demonstrated at the beamline and we are integrating a deformable mirror at ALS beamline 6.3.1 .
Monochromatic beam passing through a grating monochromator with aberrations (Simulations by Johnny Ho and Xiaoya Chong)
Measurement of the effect of aberrations on the photon energy at the exit slits (A N'Diaye)
Deformable pre-mirror
Deformable pre-mirror
We are replacing the existing bendable spherical mirror at ALS beamline 6.3.1 by a bimorph mirror (with 24 piezoelectric actuatore) in order to correct any residual aberrations, coming from either substrate figure error on the grating, line spacing errors on the ruling or any other dynamic aberrations, to enable fast polarization switching.
Existing pre-mirror at ALS beamline 6.3.1
CAD model of deformable mirror mount (J Angelo, LBNL engineering)
generating the spectral barcode
Simulations of the detected signal on camera (J Ho)
Photon Energy Sensor (PhEnSe)
Photon Energy Sensor (PhEnSe)
Any adaptive optics system encomprise a deformable mirror and a feedback – usually a wavefront sensor, but in this case it's a novel diagnostics called the photon energy sensor (PhEnSe.) This diagnostics works by depositing thin films of various elements with a clear spectral signature (L-edges) on a scintillator, and illuminating it with a dispersed (and focused beam.) This allows the determination the absolute energy entering the endstation (known edge position), and the effective resolution (line width)
Resources
Resources
github repository (private): https://github.com/dream-beam/monoplus
Initial work: https://github.com/paola-luna24/Monoplus-project
Selected dream work:
Selected dream work:
Exploring the use of x-ray adaptive optics in soft x-ray grating monochromators with wavefront propagation simulations
P. Luna, A. Wojdyla, Proceedings of SPIE 12697, Advances in Computational Methods for X-Ray Optics VI; 1269705 (2023) https://doi.org/10.1117/12.2677719Assessing adaptive optics for fast polarization switching of synchrotron light for x-ray magnetic circular dichroism
Johnny Ho, Antoine Islegen-Wojdyla, Xiaoya Chong, Ali Sabbah, Kenneth A. Goldberg, Alpha T. N'Diaye, Proceedings Volume 13620, Advances in X-Ray/EUV Sources, Optics, and Components XX; 1362008 (2025) doi.org/10.1117/12.3064047 - Submitted DRAFT (pdf)
Page updated
Report abuse