A compact and high-precision method for active beam stabilization system

Ding, Chenliang; Zhu, Dan; Wei, Zhen; Tang, Mengbo; Kuang, Cuifang; Liu, Xü

doi:10.1016/j.optcom.2021.127328

Cited by 6 publications

(3 citation statements)

References 32 publications

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“…[42][43][44][45]. Nowadays, the angular pointing of a laser beam can be stabilized within sub-µrad level using state-of-the-art active stabilization techniques [46][47][48][49][50], which corresponds to sub-µm level of transverse offset fluctuation at focus with a focal length of 1 meter. We find that for the conditions of our simulation case, a transverse offset as large as 3 µm still yields the same spin polarization but the normalized emittance in the offset direction becomes twice of that in the other direction.…”

Section: Discussionmentioning

confidence: 99%

Highly spin-polarized multi-GeV electron beams generated by single-species plasma photocathodes

Nie¹,

Li²,

Morales³

et al. 2022

Preprint

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High-gradient and high-efficiency acceleration in plasma-based accelerators has been demonstrated, showing its potential as the building block for a future collider operating at the energy frontier of particle physics. However, generating and accelerating the required spin-polarized beams in such a collider using plasma-based accelerators has been a long-standing challenge. Here we show that the passage of a highly relativistic, high-current electron beam through a single-species (ytterbium) vapor excites a nonlinear plasma wake by primarily ionizing the two outer 6s electrons. Further photoionization of the resultant Yb 2+ ions by a circularly polarized laser injects the 4f 14 electrons into this wake generating a highly spin-polarized beam. Combining time-dependent Schrödinger equation simulations with particle-in-cell simulations, we show that a sub-femtosecond, high-current (4 kA) electron beam with up to 56% net spin polarization can be generated and accelerated to 15 GeV in just 41 cm. This relatively simple scheme solves the perplexing problem of producing spin-polarized relativistic electrons in plasma-based accelerators.

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Section: Discussionmentioning

confidence: 99%

Highly spin-polarized multi-GeV electron beams generated by single-species plasma photocathodes

Nie¹,

Li²,

Morales³

et al. 2022

Preprint

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“…A common practice to improve the precision and stability of beam is to weaken the vibration interference [3] .The traditional foundation vibration isolation [4][5] in beam pointing research has limited effect on the control of low and medium frequency vibration, and cannot further improve the beam pointing accuracy. The use of mirrors with feedback control to weaken the error [6] is also a frequently considered approach. The piezoelectric ceramic-driven fast steering mirror (FSM) has the good performance of small size, fast response and high precision [7] , which is very suitable for weakening the beam position error.…”

Section: Introductionmentioning

confidence: 99%

A PID algorithm based on convolutional neural network for pointing stabilization control of synchrotron radiation beams

Hu,

Liang,

Xiu

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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A PID algorithm using a fixed set of parameters in synchrotron radiation beam control systems does not meet the need to control various environmental vibrations. This study proposes a vibration identification method based on convolutional neural network(CNN) to improve the PID algorithm. Firstly, the genetic algorithm is used to rectify the optimal control parameters for various types of vibration in advance, and then the CNN recognizes the vibration types to assist the PID algorithm in selecting the corresponding optimal control parameters online, so as to realize the optimal control under various vibrations. A set of mixed vibration signal inputs are applied to the beam control system to detect the final beam position deviation displacement. The experiment shows that the beam deviation displacement under the improved PID method is smaller and has better results than the traditional PID control method

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“…In this study, to achieve beam spatial alignment and stability automatically, we propose a new method that can be used for spatial alignment and stability of beams in multi-beam systems. The error separation technique that we previously proposed [21] was used in this method, which has the ability to avoid alignment errors caused by the coupling effect of piezoelectric devices, inaccurate correction calculations, and detection mode of angular deviation, compared with other previous calibration techniques. The spatial alignment and stability system of the double beams was built with a small size, and a pair of detectors was used to adjust the spatial alignment of the two beams, which can then exit with the same beam center and high stability.…”

Section: Introductionmentioning

confidence: 99%

Method for active spatial alignment and stabilization of laser beams in multi-beam systems

Ding

Zhu

et al. 2023

中国光学快报

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We propose a new method for the development of multi-beam systems for the spatial alignment and stability of beams based on the error separation technique. This method avoids alignment errors caused by coupling effect of piezoelectric devices, inaccurate correction calculations, and detection mode of the angular deviation. According to the results by external detectors, the error value of spatial alignment and the root mean square (RMS) of deviations under control during 1 h can be equivalent to approximately 0.87 and 1.06 nm at the sample plane under an oil immersion lens (focal length f = 2 mm). The RMS of deviations is less than one-third of those currently reported for multi-beam systems; therefore, higher alignment and stability accuracy can be achieved with our proposed method.

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A compact and high-precision method for active beam stabilization system

Cited by 6 publications

References 32 publications

Highly spin-polarized multi-GeV electron beams generated by single-species plasma photocathodes

Highly spin-polarized multi-GeV electron beams generated by single-species plasma photocathodes

A PID algorithm based on convolutional neural network for pointing stabilization control of synchrotron radiation beams

Method for active spatial alignment and stabilization of laser beams in multi-beam systems

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