26AUG16

LCLS-II baseline [29JUN16] (15.59 MeV/m … 6% overhead) 1.600 GeV BC2 15 L2 L3 4.000 GeV Jose’s space ~10 m COL2 EXT 16 25 26 35 CP-1 15+2 CP-2 20 BRB1 (to NIT) NOTE: not to scale LCLS-II-HE [07JAN16] (17.68 MeV/m … 6% overhead) 1.600 GeV BC2 15 L2 L3 7.000 GeV Jose’s space 24.4 m COL2 16 25 26 35 36 45 46 54 CP-1 25+2 BRB1 (to NIT) CP-2 29 68.82 m LCLS-II-HE [01JUL16] (18.60 MeV/m … 6% overhead) 1.882 GeV BC2 15 3.630 GeV 8.000 GeV Jose’s space 12.2 m 16 27 28 37 38 47 48 57 CP-2 30 BRB1 (to NIT) CP-1 25+2

LCLS-II baseline (15.59 MeV/m … 6% overhead) 1.600 GeV BC2 15 L2 L3 4.000 GeV 44.19 m Jose’s space ~10 m COL2 EXT 16 25 26 35 CP-1 15+2 CP-2 20 BRB1 (to NIT) LCLS-II′ (15.56 MeV/m … 6% overhead) L2 1.600 GeV L3 4.000 GeV BC2 particle free NOTE: not to scale 15 16 26 27 30 35 20 m BRB1 (to NIT) CP-1 15+2 CP-2 20 special long vacuum break (ΔL = +7.72 m) LCLS-II-HE (19.53 MeV/m … 6% overhead) L2 1.963 GeV L3 3.623 GeV L4 8.000 GeV BC2 12.4 m Jose’s space 15 16 26 27 36 37 45 46 55 BRB1 (to NIT) CP-1 26+2 CP-2 29

NOTE: this drawing has been modified to show 26AUG16 design 27 37 36 46 45 55 L4 SIT SCRF expansion and layout. Each gray block represents one 12-m long 1.3-GHz cryomodule, with 55 total CM’s. A fast extraction kicker is added at 3.6-GeV to optionally feed the SXR FEL at 3.6 GeV. The cryo distribution (CP – blue lines) is also shown. 2.0 GeV 3.6 GeV 36 55 Cryomodules and the cryo distribution system for the LCLS-II-HE upgrade with 55 total CM’s. NOTE: this drawing has been modified to show 26AUG16 design

Surface Transfer Lines / DB positions 0.610 m 41.8521 m Surface Transfer Lines 2 x 80m = 160 m 44.1889 m from Vincent Heloin

DISTRIBUTION BOX 2 POSITION 5.75945 m FC6 5-4 5-5 CM (34.00) ZFC6 = 434.1756 m (29JUN16) → 389.9867 m (19AUG16)

Low Energy Extraction South Tunnel Wall North Tunnel Wall Tunnel Floor Tunnel Ceiling Kickers Septum SIT CM27

looking East beam into page NIT SIT 120” = 4.01” 132” = 4.38”

WSEMIT2

Changes with respect to baseline (29JUN16) remove COL2 move L3 u/s 44.1889 m (including cryogenics Distribution Box #2) add EMIT2 between BC2 and L3 four 1.259Q3.5 quadrupoles double-waist (βX = βY ≈ 6 m; σ ≈ 25 μ) provided for quad-scan ε-measurement match into L3 add 20 CM’s (55 1.3 GHz CM’s total) L3 has 11 CM’s; L4 has 29 CM’s (10-break-9-break-10) common L2/L3/L4 gradient: 19.53 MeV/m (includes 6% overhead) BC2 energy increases from 1.6 GeV to 1.963 GeV final energy = 8.0 GeV extract 3.623 GeV beam after L3 and connect to SIT line with dogleg FC7 (d/s end of L3) to FC8 (u/s end of L4) ΔZ = 44.6 m required for extraction 3 kickers plus Lambertson septum (spreader type) used to extract standard “2π” dogleg design (eight 2Q10’s) reinstall SIT line from “QB-5” (Sector 8) connection from SIT line to SXR not yet designed

Still to do connect SIT line to SXR add two sextupoles to LEX (Low Energy Extraction) check effectiveness of single R56-compensation chicane after LEX begin engineering design iterations tracking studies

LCLS-II’

LCLS-II baseline (15.59 MeV/m … 6% overhead) 1.600 GeV BC2 15 L2 L3 4.000 GeV 44.19 m Jose’s space ~10 m COL2 EXT 16 25 26 35 CP-1 15+2 CP-2 20 BRB1 (to NIT) LCLS-II′ (15.56 MeV/m … 6% overhead) L2 1.600 GeV L3 4.000 GeV BC2 particle free NOTE: not to scale 15 16 26 27 30 35 20 m BRB1 (to NIT) CP-1 15+2 CP-2 20 special long vacuum break (ΔL = +7.72 m) LCLS-II-HE (19.53 MeV/m … 6% overhead) L2 1.963 GeV L3 3.623 GeV L4 8.000 GeV BC2 14.9 m Jose’s space 15 16 26 27 36 37 45 46 55 BRB1 (to NIT) CP-1 26+2 CP-2 29

BC2 EMIT2 dogleg 16 26 27 35 NIT particle free ε

Changes with respect to baseline (29JUN16) remove COL2 move L3 u/s 44.1889 m (including cryogenics Distribution Box #2) add EMIT2 between BC2 and L3 four 1.259Q3.5 quadrupoles double-waist (βX = βY ≈ 6 m ; σ ≈ 25 μ) provided for quad-scan ε-measurement match into L3 35 1.3 GHz CM’s total (baseline) … repartition L3 L3 has 20 CM’s (11-long break-9 … baseline was 10-break-10) use a long break (ΔL = 7.72 m) between CM26 and CM27 to align CMs for LCLS-II-HE 3 CM’s must move to upgrade to LCLS-II-HE if we use a standard vacuum break, 9 CM’s must move to upgrade to LCLS-II-HE retain baseline L2/L3 gradients BC2 energy = 1.6 GeV final energy = 4.0 GeV remove EXT move dogleg 277.15 m upstream (into Sector 7) leave 20 m particle-free space between post-L3 Differential Pumping station and R56-compensation chicane (includes two QE-type quadrupoles) install two NIT line FODO cells u/s of “QBP13”

LCLS-II-HE’ ?

LCLS-II baseline (15.59 MeV/m … 6% overhead) 1.600 GeV L3 4.000 GeV 44.19 m BC2 Jose’s space ~10 m COL2 EXT 15 16 25 26 35 CP-1 15+2 CP-2 20 BRB1 (to NIT) LCLS-II′ (15.85 MeV/m … 6% overhead) L2 1.800 GeV L3 4.000 GeV BC2 particle free NOTE: not to scale 15 17 18 27 28 35 20 m BRB1 (to NIT) CP-1 17+2 CP-2 18 special long vacuum break (ΔL = +7.72 m) LCLS-II-HE’ (18.65 MeV/m … 6% overhead) L2 2.159 GeV L3 3.619 GeV L4 8.000 GeV BC2 Jose’s space 14.9 m 15 17 18 27 28 37 38 47 48 57 CP-1 27+2 BRB1 (to NIT) CP-2 30