A scanning multi-probe straightness measurement system for alignment of linear collider accelerator

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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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 integration 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.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalKey Engineering Materials
Publication statusPublished - 2005


  • Accelerator
  • Cylinder
  • Dimensional measurement
  • Linac component
  • Linear collider
  • Measurement
  • Multi-probe method
  • Straightness
  • Three-probe method

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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