MD study: characterize staggered L1 chirp
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observation: beam tails that can be clipped by BC11 collimator suggest something is longitudinally wrong in L1 (or possibly before) -> want to investigate chirp setup in L1 to see how beam quality is affected

new chirp setting:
  --> phi = arcsin[(E1/E2 + 1)*sin(psi)]

where:
  E1, E2 are 11-1,2 ENLDs,
  psi = old 11-1,2 phase,
  phi = new 11-2 phase

compare (1) current L1 chirp setup and (2) staggered L1 chirp
setup:

* procedure setup:
  - stable beam to S20
  - 11-1,2 phases verified by scan
  - should have nominal BC11 BLEN setting on both chirp settings
  - change chirp -> send beam to TD11 -> let feedbacks converge -> send beam to S20

* measurements:
  - L2 wire profiles
  - L2, L3 emittance
  - IPWS1 wire size
  - DTOTR2 + SYAG image
  - XTCAV BLEN
  - PLIC signal
  - difference orbit between distributed/staggered chirp

if time permits: repeat & compare msmts with BC11 collimator IN