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.

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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 ~ 2.0Ey ~ 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 QFP9R QDP8R QFP7R QDP6R QFP5R QDP4R QFP3R QDPR QFPR QFP9R QDP8R QFP7R QDP6R QFP5R QDP4R QFP3R QDPR QFPR SKG SKG SK6L SK5L SK4L0.565 SK3L0.561 SK2L SK SK SK SK SK SKG SKG

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?