1. 26AUG16

2. 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

3. 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 = 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

4. NOTE: this drawing has been modified to show 26AUG16 design27 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

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

6. DISTRIBUTION BOX 2 POSITIONm
FC6
5-4
5-5 CM
(34.00)
ZFC6 = m (29JUN16) → m (19AUG16)

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

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

9. WSEMIT2

13. Changes with respect to baseline (29JUN16)
remove COL2
move L3 u/s 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 ( GHz CM’s total)
L3 has 11 CM’s; L4 has 29 CM’s (10-break-9-break-10)
common L2/L3/L4 gradient: MeV/m (includes 6% overhead)
BC2 energy increases from 1.6 GeV to GeV
final energy = 8.0 GeV
extract 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

14. 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

15. LCLS-II’

16. 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 = 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

17. BC2
EMIT2
dogleg 16 26 27 35
NIT
particle
free ε

19. Changes with respect to baseline (29JUN16)
remove COL2
move L3 u/s 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
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 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”

20. LCLS-II-HE’ ?

21. 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 = 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