Transcript Corrector Upgrade (P. Emma),

Shot-to-Shot Orbit Stability in LCLS
 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…
New LCLS XOR’s full range at rms regulation  10-4 for orbit jitter 2% of beam-size
existing Bmax for
linac correctors
need this Bmax
for existing XCOR’s
new correctors
Bmax 20
Solution
 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
LCLS X and YCOR strength to steer by one beam-size unit
Corrector strength needed to steer by 1-sigma