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)