Modelling the effects of optical vibrations on photon beam parameters using ray-tracing software

Abstract

A method to simulate beam properties observed at the beamline sample-point in the presence of motion of optical components has been developed at Diamond Light Source. A series of stationary ray-tracing simulations are used to model the impact on the beam stability caused by dynamic motion of optical elements. Ray-tracing simulations using SHADOW3 in OASYS, completed over multiple iterations and stitched together, permit the modelling of a pseudo-dynamic beamline. As beamline detectors operating at higher frequencies become more common, beam stability is crucial. Synchrotron ring upgrades to low-emittance lattices require increased stability of beamlines in order to conserve beam brightness. By simulating the change in beam size and position, an estimate of the impact the motion of various components have on stability is possible. The results presented in this paper focus on modelling the physical vibration of optical elements. Multiple beam parameters can be analysed in succession without manual input. The simulation code is described and the initial results obtained are presented. This method can be applied during beamline design and operation for the identification of optical elements that may introduce large errors in the beam properties at the sample-point.

Optical autocollimator for vibration measurements at Diamond I13 beamline

“…However, further progress requires extreme stability of experimental setup and vibration is often a problem causing poor quality of photon beams [3]. Therefore, vibration measurement, analysis, and control at long synchrotron beamlines is crucial for the full realisation of potential offered by fourth generation storage rings [4].…”

An assisted decision-making tool for synchrotron beamline alignment based on neural networks

“…When this scheme is implemented, the 𝑂𝐸 𝑠 in the beamline must be adjusted sequentially, which is very time-consuming and cannot guarantee to get the ideal focusing quality at the sampling point. Recently, C. Houghton et al developed a scheme to simulate the effect of the dynamic movement of 𝑂𝐸 𝑠 on beam stability [6]. This method uses 𝑆𝐻 𝐴𝐷𝑂𝑊3 in 𝑂 𝐴𝑆𝑌 𝑆 [7] for ray-tracing simulation, depending on multiple iterations and stitching, which is very complicated and cannot quickly obtain ideal optical characteristics at the sample point.…”