Beamline smoothing of the Advanced Photon Source

Friedsam, H.; Pěnička, Martin; Zhao, Shufan

doi:10.1109/pac.1995.505462

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…The data, including elevation information, were analyzed using a bundle adjustment routine developed at Stanford Linear Accelerator Center (SLAC). The differences between the resulting magnet positions from the bundle adjustment and the ideal locations were then subjected to a smooth curve fitting operation to obtain an estimate for the achieved relative alignment [5].…”

Section: Alignment Resultsmentioning

confidence: 99%

Long-term stability of the APS storage ring

Friedsam¹,

Pěnička²,

Error³

2000

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Section: Alignment Resultsmentioning

confidence: 99%

Long-term stability of the APS storage ring

Friedsam¹,

Pěnička²,

Error³

2000

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“…Since the development of a laser tracker (LT) in 1980s by Lau et al [1,2], LTs have been widely used to measure length, such as in the production and assembly of components of aircraft and the space industry, motion calibration of industrial robots, error evaluation of coordinate measuring machines, and alignment of large-scale structures such as a particle accelerator and a telescope [1][2][3][4][5]. Recently, the High Energy Accelerator Research Organization (KEK) in Japan has been developing a system to measure the anomalous magnetic moment and electric dipole moment (g − 2) of muons with ultrahigh precision by utilizing an ultracold muon beam [6].…”

Section: Introductionmentioning

confidence: 99%

Novel design of ball-lens-based laser tracker using pulsed interferometer

Masuda

Nakajima

Winarno

et al. 2019

Meas. Sci. Technol.

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A new laser tracker using an optical frequency comb with ball lenses as a reference and targets is proposed. In this system, high-accuracy absolute length measurement based on pulsed interferometry of an optical comb is utilized. By using a ball lens with a refractive index of 2.0 as a reference, it can avoid the error caused by reference point displacement. As targets, ball lenses have a wider acceptance angle than a conventional retroreflector. In this work, two new designs of the laser tracker are proposed. The simulation and experimental investigation of the refractive index characteristics of a ball lens were examined to obtain the optimal parameters for each design. Using these designs, the one-axis absolute length measurement of as much as 10 m was performed, and its combined uncertainty was evaluated to be [(0.145 µm) 2 + (3.05 × 10 −7 l) 2 ] 1/2 , where l is measured length.

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“…Particle accelerators are traditionally aligned by means of geomatics instruments and techniques, such as precision levels and theodolites [10]. Today, with the evolution of portable coordinate measuring instruments, small to middle-sized machines (hundreds of meters-long) have shifted to the use of spherical coordinate systems, whereas, large accelerators (kilometers-long) tend to use a combination of total stations, levels and global navigation satellite system (GNSS) [11]. This branch of dimensional metrology has become known as large-scale metrology [12,13].…”

Section: Introductionmentioning

confidence: 99%

Engineering survey planning for the alignment of a particle accelerator: part I. Proposition of an assessment method

Leão

Baldo

Reis

et al. 2018

Meas. Sci. Technol.

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The performance of particle accelerators depends highly on the relative alignment between their components. The position and orientation of the magnetic lenses that form the trajectory of the charged beam is kept to micrometric tolerances in a range of hundreds of meters of the length of the machines. Therefore, the alignment problem is fundamentally of a dimensional metrology nature. There is no common way of expressing these tolerances in terms of terminology and alignment concept. The alignment needs for a certain machine is normally given in terms of deviations between the position of any magnet in the accelerator and the fitted line that relates the actual position of the magnets’ assembly. Root mean square errors and standard deviations are normally used interchangeably and measurement uncertainty is often neglected. Although some solutions have been employed successfully in several accelerators, there is no off-the-shelf solution to perform the alignment. Also, each alignment campaign makes use of different measuring instruments to achieve the desired results, which makes the alignment process a complex measurement chain. This paper explores these issues by reviewing the tolerances specified for the alignment of particle accelerators, and proposes a metric to assess the quality of the alignment. The metric has the advantage of fully integrating the measurement uncertainty in the process.

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Beamline smoothing of the Advanced Photon Source

Cited by 7 publications

References 6 publications

Long-term stability of the APS storage ring

Long-term stability of the APS storage ring

Novel design of ball-lens-based laser tracker using pulsed interferometer

Engineering survey planning for the alignment of a particle accelerator: part I. Proposition of an assessment method

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