New 135-MeV injector energy requires minor changes

1
New 135-MeV injector energy requires minor
changes to linac operating point
2
(easy)
3
LCLS Accelerator and Compressor Schematic
6 MeV ?z ? 0.83 mm ?? ? 0.01
135 MeV ?z ? 0.83 mm ?? ? 0.10
250 MeV ?z ? 0.19 mm ?? ? 1.6
4.54 GeV ?z ? 0.022 mm ?? ? 0.71
14.35 GeV ?z ? 0.022 mm ?? ? 0.02
Linac-X L 0.6 m ?rf -160?
rf gun
Linac-1 L 9 m ?rf -25
Linac-2 L 330 m ?rf -41
Linac-3 L 550 m ?rf -13
new
Linac-0 L 6 m
undulator L 120 m
25-1a 30-8c
21-1b 21-1d
21-3b 24-6d
X
...existing linac
BC-1 L 6 m R56 -39 mm
BC-2 L 22 m R56 -25 mm
DL-1 L 12 m R56 ?0
DL-2 L 66 m R56 0
SLAC linac tunnel
undulator hall
(July 9, 2003)
4

• No engineering changes made all changes are in
  operational parameters
• DL1 bend fields are reduced from 7.521 kG to
  6.769 kG
• X-band rf phase tolerance almost 2-times looser
• Mean Ls rf phase tolerance 2-times looser
• L1 rf gradient reduced to very reasonable 16.8
  MV/m
• Old parameter set still possible with only
  control-room adjustments