1.  LCLS beam energy is 200-times lower at sec-21 than SLC beam (2-times lower in FFTB)  LCLS emittance is 5-50 times smaller than SLC  Need weaker corrector strengths by… Shot-to-Shot Orbit Stability in LCLS

2. existing Bmax for linac correctors Bmax  20 New LCLS XOR’s full range at rms regulation  10  4 for orbit jitter 2% of beam-size need this Bmax for existing XCOR’s new correctors

3.  Modify ~80 existing XCOR’s and ~80 YCOR’s  Reduce dynamic range by 10-30 by adding trim coil to existing correctors?  Add new low-range LCLS-mode supplies (rms 10  4 )  Add switch to turn off existing supplies  New problem – solution not yet decided Solution

4. LCLS X and YCOR strength to steer by one beam-size unit Corrector strength needed to steer by 1-sigma