The R&amp;D of NSLS-II Girder Profiling

Yu, Chenghao; Spataro, C.; Karl, F.; Hubbard, Rodger; Sharma, S.; Jain, A.; Doom, L.; Skaritka, J.

doi:10.2172/1504896

Cited by 2 publications

(2 citation statements)

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“…This is, however, a problem the experimentalist is urged to deal with. In some cases, some metric to measure the performance of the instrumentation is considered; in others, uncertainty components are combined in a quadratic manner without a proper model to correlate them [18,19].…”

Section: Subject Mattermentioning

confidence: 99%

“…This value (normally estimated by RMS errors) of the deviations may address the smoothness of the particles trajectory, but not the uncertainty of the measurement process involved in the alignment. In the literature, probably due to the complexity of the measurement system and the difficulty in modeling it by mathematical functions, when uncertainties are estimated for specific components, they are usually not combined in a rigorous manner [18,19,52]. For example, let us assume that isolated uncertainty estimations were performed for the fiducialization, the monument network points and the uncertainty of the fiducial measurements inside the accelerator tunnel.…”

Section: Aps Upgradementioning

confidence: 99%

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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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Section: Subject Mattermentioning

confidence: 99%

Section: Aps Upgradementioning

confidence: 99%