Response analysis of LHC Sectors 8-7-6 and 2-3-4-5

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Response analysis of LHC Sectors 8-7-6 and
2-3-4-5

• J. Wenninger, K. Fuchsberger

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The riddle of Saturday (8..6)
H
Problem starts around 5L7, 6L7
V
Beam from left to right, bars measurement, dots
model
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Fit with strength for kq6.l7b2
H
V
Beam from right to left. No monitor- and
corrector gains fitted! Good fit ?rms 2.627
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Used fit parameter
Fit gives clear inversion
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The riddle of Sunday (2..5)
Only horizontal data available
BPM.6L3
BPM.10L3
Corrector MCBH.12R2.B1
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Diff. meas - model
rms
BPM.13R3.B1
One Corrector
Phase from the beginning
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Model with values from trim
4L3
7L3
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Fit - parameters
Preliminary changed kqtl8.r3b1
0.000604 (nominal 0.002529) kqtl10.r3b1
0.000604 (nominal0.0029587) kqtl11.r3b1
-0.0006039 (nominal -0.00408)
Change in defocusing strength (phase)
Also found wrong in trim kqt12.r3b1
0.0005758 (nominal 0.00525) kqt13.r3b1
-0.0005758 (nominal -0.005236)
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Monitor- and corrector gains