The LCLS-II BSY, LTU, and UH Layout
Paul Emma et al.May 18, 2011
LCLS-II Meeting
LCLS-II Machine Layout
New injector at sector-10 (1 km upstream)Two new bunch compressors and 4-14 GeV linac (~1 km)1200-m long bypass (old PEP-II 9-GeV line) goes around LCLS-I
Slide 2
LCLS-IX
L1 L2 L3BC1 BC2
RFgun-1
L0
3-15 GeV
existing und-hall-1
LCLS-I
L3
RFgun-2
L1 L2BC1 BC2
L0
one more km of linac
HXR4-14 GeV bypass line
SXR
und-hall-2
X
LCLS-II
Sector-20 wall
Inside Linac Tunnel - Looking Downstream
Slide 3DOE CD-1 Review of the LCLS-II Project, April 26-28, 2011
47”
66”
120”
132”
LINAC
25.610”
25.570”
9-GeV (PEP-II)17” 3-GeV
(PEP-II)
(ID-344-013-30)
Use existing PEP-II bypass line on linac tunnel ceiling(FODO cells with one quad every 101.6 m)
Moves LCLS-II 25.57” higher than LCLS-I
Existing Bypass Line in Linac Tunnel
LCLS-II Bypass Line
Slide 4
LCLS-II Layout After Linac
Armin Busse
LTUS (LCLS-II)
LTUH (LCLS-II)
pulsed bend
2.4-deg bends (4)
LCLS-I (approx.)
Slide 5
Slide 6
LCLS-II Layout After Linac
Need 2 low-profile quads here
Pulsed bend
Head-House Port (South Side)
LCLS-II-H
2.43 m (7.97 ft)
0.92 m(3.02 ft)
2.12 m (6.96 ft)
3.05
m (1
0.0
ft)
1.01 m(3.30 ft)
Wall face at Z’(LCLS) = 346.24 m
2.67 m
LCLS-II-S
0.51 m
2.05
m
LCLS-IX’ = -1.25 mY’ = -0.90 m
Slide 7
LCLS-II Line Fits Close to LCLS-I in BTH
Slide 8DOE CD-1 Review of the LCLS-II Project, April 26-28, 2011
LCLS-I
LCLS-II
LCLS-II Beam Transport Layout
Slide 9
LCLS-I FEE1LTU1
Undulator Hall, LCLS-I
e- dump
SXR
HXRFEEH
FEES
LTU2LTUH
LTUS
New Undulator Hall, LCLS-2pulsed dipole2.4°
e- dump-H
e- dump-S
2.5 m
LINAC
Exp. Hall
X-ray Transport to Experimental Hall-2
Slide 10J. Welch
Start-2-End Tracking with LCLS-II Optics
BC1 BC2
bypass line2.4°
bends
HXR und.
SXR not shown
Thanks to M. Woodley and Y. Nosochkov Slide 11
LCLS-II Electron Beam Diagnostics
L0
L1 L2 L3HXR
SXR
µ
BC2BC1
YAG screensOTR screensWire scannersBunch length mon.
2 Transverse RF cavities (135 MeV & 5 GeV)6 YAG screens8 OTR screens19 wire scanners (each with x & y wires)3 bunch length monitorsGun spectrometer, injector spectrometer, dump spectrometerBC1 stopper, abort kicker, BSY stopper, 2 undulator stoppers
gun
DL1 DL211-3 to 14-4 14-7 to 20-4
11-1
sd
sd sd
sd
sd
sd
sd
sd
sz szsz
Slide 12
Muon Plug Wall Exit to HXR Dump
2.4-degbends
HXR Emittance
Diagnostics and
Collimation
Self-Seeding Section
HXU
H-DumpVert.
bends
m-plugHXR
matching
Y. Nosochkov Slide 13
New Abort Kicker Located Above Old D10 Box
A. Ibrahimov
New abort kicker is in BSY now, but same as LCLS-I
New D2’ Stopper Needed (B-Line Bends Get Removed)
A. Ibrahimov
New D2’ Stopper in BSY (and its backup stoppers)
D2’ST60’
ST61’
ST61
QBP34
QA0
A. Ibrahimov
m-plug wall
Slide 17
A. Ibrahimov
Start of Muon Plug Wall (17 m thick iron)
Slide 18
HXR Matching Section, HXU, and Dump
HXR Self-Seeding Section
HXU
H-Dump
HXR Matching
Y. Nosochkov Slide 19
Muon Plug Wall Exit to SXR Dump
2.4-degbends
SXR Emittance
Diagnostics and
Collimation
Self-Seeding Section
SXU
S-DumpVert.
bends
m-plug
SXR matching
Y. Nosochkov
septum
Slide 20
SXR 3-Wire Emittance Diagnostics Section + Collimation
SXR Emittance Diagnostics and
Collimation
Y. Nosochkov
WS
LTU
S1
WS
LTU
S2
WS
LTU
S3
Dx,y = 120
Dx,y = 90
Slide 21
SXR Matching Section, SXU, and Dump
Self-Seeding Section
SXU
S-Dump
SXR matching
Y. Nosochkov Slide 22
New Features in LCLS-II
Y-kicker + HLAM magnets in BTH to split beam into HXR & SXR @ 60 Hz each
LTUH line has 4 LTU-like wire-scanners and 2/2 final x/y collimators
LTUS line has 3 BC1-like wire-scanners and 2/2 final x/y collimators
Each undulator line has an insertable stopper (TDUNDH & TDUNDS)
Future self-seeding sections leads each new undulator (30-100 m)
Two separate electron beam dumps
Soft bends start each dump bend (no Be foil needed)
Two separate x-ray front-ends (diagnostics – J. Welch, P. Heimann, J. Frisch)
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