1. Linearization of Bunch Compression (2nd order )
Includes 2nd-order chicane compaction (T566)
Reduce BC1 energy (250  225 MeV) to reduce V39 by 10%

2. LCLS-II Longitudinal Tracking with Variable 3.9-GHz Voltage
Nominal:
V39 = 64.7 MV
j39 = -150 deg
V39 = 60.0 MV
j39 = -160 deg
RF Gradients (MV/m):
L0 L1 L39 L2 L3
Nom
60 MV: no
change

3. LCLS-II Longitudinal Tracking with Variable 3.9-GHz Voltage
Nominal:
V39 = 64.7 MV
j39 = -150 deg
V39 = 57.0 MV
j39 = -165 deg
spike
appears
RF Gradients (MV/m):
L0 L1 L39 L2 L3
Nom
57 MV: