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A Scanning Multi-Probe Straightness Measurement System for Alignment of Linear Collider Accelerator

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Abstract:

This paper describes a scanning multi-probe measurement system for local alignment of linac components. The system consists of two probe-units, each having three displacement probes. The two probe-units, which are placed on the two sides of the cylindrical linac components, are moved by a scanning stage with a scanning range of 5 m to simultaneously scan the two opposed straightness profiles of the linac cylinders. A differential output calculated from the probe outputs in each probe-unit cancels the influence of error motions of the scanning stage, and a double ntegration of the differential output gives the straightness profile. The difference between the unknown zero-values of the probes in each probe-unit of zero-difference, which introduces a parabolic error term in the profile evaluation result, is calculated and compensated for by a zero-adjustment method so that accurate straightness profiles of the linac cylinders can be obtained. The effectiveness of the measuring system is confirmed by experimental results.

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Periodical:

Key Engineering Materials (Volumes 295-296)

Pages:

253-258

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.295-296.253

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Online since:

October 2005

Authors:

Wei Gao, J. Yokoyama, S. Kiyono, N. Hitomi

Keywords:

Accelerator, Cylinder, Dimensional Measurement, Linac Component, Linear Collider, Measurement, Multi-Probe Method, Straightness, Three-Probe Method

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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