In the third generation light source, photon beam position stability is critical issue on user experiment. Generally photon beam position monitors have been developed for the detection of the real photon beam position and the position is controlled by feedback system in order to keep the reference photon beam position. In the PLS-II, photon beam position stability for front end of particular beam line, in which photon beam position monitor is installed, has been obtained less than rms 1μm for user service period. Nevertheless, detail analysis for photon beam position data in order to demonstrate the performance of photon beam position monitor is necessary, since it can be suffers from various unknown noises. (for instance, a back ground contamination due to upstream or downstream dipole radiation, undulator gap dependence, etc.) In this paper, we will describe the start to end study for photon beam position stability and the Singular Value Decomposition (SVD) analysis to demonstrate the reliability on photon beam position data.

1.
S.
Shin
 et al,
Commissioning of the PLS-II
,
J. Instrum.
8
,
P01019
(
2013
).
4.
Changbum
Kim
 et al,
Photon-beam-position Monitor in the PLS diagnostic Beamline
,
J. Korean Phys. Soc.
56
,
1981
(
2010
).
5.
L.
Emery
,
Application of Model-Independent Analysis using the SDDS Toolkit
,
PAC03
,
Portland, OR
(
2003
).
6.
A.
Seryi
, et al “
Hydrostatic Level System for Slow Ground Motion Studies at Fermilab and SLAC
”,
PAC’01
,
Chicago
, p.
1479
(
2001
); http://www.JACoW.org.
7.
Chun-xi
Wang
,
Spatial-temporal modes observed in the APS storage ring using MIA
,
PAC03
,
Portland, OR
(
2003
).
This content is only available via PDF.