LER MAR13 Analysis
• Is MIA data less accurate than that taken in last year? Is phase measurement still Ok? Is coupling measurement still Ok? Or simply that the MIA solution over-kill? Or MIA solution caused unwanted nonlinear effect?
Yiton T. Yan
SLAC
Let us quickly survey some results and then we will discuss this at the end.
Virtual LER MAR13, 2007 (left) and wanted model (right)
ey ~ 2.0 Ey ~ 1.5
MIA wanted LER (left) and after-dialing LER (right)
Virtual LER MAR13, 2007 (left) vs. after dialing in MIA solution (right)
XX raw data ---- Mar13, 2007 (left) vs. April 25, 2006
YY raw data ---- Mar13, 2007 (left) vs. April 25, 2006
XY raw data ---- Mar13, 2007 (left) vs. April 25, 2006
YX raw data ---- Mar13, 2007 (left) vs. April 25, 2006
Symplecticity for XX vs. YY MIA data shows that the MIA
data for XX and YY seems to have similar quality
Singular values ---- Mar13, 2007 (left) vs. August 15, 2006
Singular Vectors ---- Mar13, 2007 (left) vs. August 15, 2006
Comparison of R12 residuals: Apr 25, 2006 (top) vs. Mar 13, 2007 (bottom)
Comparison of R34 residuals: Apr 25, 2006 (top) vs. Mar 13, 2007 (bottom)
Comparison of R32 (y to x) residuals: Apr 25, 2006 (top) vs. Mar 13, 2007 (bottom)
Comparison of R14 (x to y) residuals: Apr 25, 2006 (top) vs. Mar 13, 2007 (bottom)
The Knob: magnet strength changes
QFP9R12 -0.645
QDP8R12 0.71
QFP7R12 -2.477
QDP6R12 -0.523
QFP5R12 -1.018
QDP4R12 1.15
QFP3R12 0.345
QDPR12 0.39
QFPR12 -2.033
QFP9R04 1.081
QDP8R04 0.434
QFP7R04 0.983
QDP6R04 0.325
QFP5R04 1.001
QDP4R04 -0.683
QFP3R04 0.865
QDPR04 -0.328
QFPR04 0.578
SKG1 -1.745
SKG2 3.494
SK6L -0.215
SK5L -0.013
SK4L 0.565
SK3L 0.561
SK2L -0.903
SK2 0.013
SK3 1.127
SK4 -1.194
SK5 0.418
SK6 0.416
SKG3 -1.357
SKG4 -1.579
Discussion – Why MIA LER solution did not work on Mar 13, 2007, what should we do next for LER?
• Simply LER MIA data was not good enough to warrant a good enough virtual LER?
• The solution over-kill: strong changes of global skew, etc. causing significant orbit change which was not restored to the original orbit after dialing in MIA solution?
• Others?• What should we do next for LER?