Precision surveying and smoothing analysis for Pohang Light Source

Author

Seo, K.W. ; Maeng, A.H. ; Lee, S.C. ; Ko, I.S.

Author_Institution

Pohang Accel. Lab., South Korea

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

3663

Abstract

The Pohang Light Source (PLS), a 2 GeV synchrotron radiation source, started its operation from August 1994. The magnets of the storage ring were aligned to a designed beam path with a relative positional error of 0.15 mm(rms) in 1994. Since then the storage ring tunnel has moved by 1.0 mm and 3.0 mm per year (average) in the horizontal and the vertical directions, respectively. The deformation by the ground motion gives rise to the maximum offsets from the designed beam path. We introduce a smoothing analysis using a low-pass filter method in order to estimate the relative positional errors close to the actual beam path. Based on the measurement of the machine deformations and daily machine operational status, we come up with an idea of the allowable maximum offset of 2.0 mm from the designed beam path. The relation between boundary conditions of the smoothing analysis and estimated maximum offset is also studied

Keywords

electron accelerators; position measurement; storage rings; surveying; 1 mm; 2 GeV; 2 mm; 3 mm; PLS; Pohang Light Source; deformation; low-pass filter; magnet alignment; maximum offset; positional error; smoothing analysis; storage ring tunnel; surveying; synchrotron radiation source; Coordinate measuring machines; Light sources; Low pass filters; Magnetic analysis; Magnetic separation; Magnets; Smoothing methods; Storage rings; Structural beams; Theodolites;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.753377

Filename

753377