150 Beam-based Correction and Optimization for Accelerators
0
50
100
150
quadrupole variable
-0.015
-0.01
-0.005
0
0.005
0.01
0.015
0.02
K (m
-2
)
Fit raw X/Y
Figure 5.18 The fitted quadrupole gradient errors, ∆K, for NSLS-II by directly
fitting turn-by-turn position data, using the least-square method for Eq. (5.47).
0
20
40
60
80
100 120 140 160 180
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
(rad)
x
y
Figure 5.19 The phase advance errors in the fitted lattice obtained by fitting the
raw position data, to be compared to Figure 5.13.
0
50
100
150
quadrupole variable
-0.015
-0.01
-0.005
0
0.005
0.01
0.015
0.02
K (m
-2
)
Fit raw X/Y
Figure 5.18 The fitted quadrupole gradient errors, ∆K, for NSLS-II by directly
fitting turn-by-turn position data, using the least-square method for Eq. (5.47).
0
20
40
60
80
100 120 140 160 180
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
(rad)
x
y
Figure 5.19 The phase advance errors in the fitted lattice obtained by fitting the
raw position data, to be compared to Figure 5.13.