LCLS Accelerator SLAC linac tunnel research yard Linac-0 L =6 m Linac-1 L  9 m  rf   25° Linac-2 L  330 m  rf   41° Linac-3 L  550 m  rf  0° BC1 L  6 m R 56   39 mm BC2 L  22 m R 56   25 mm DL2 L =275 m R 56  0 DL1 L  12 m R 56  0 undulator L =130 m 6 MeV  z  0.83 mm    0.05 % 135 MeV  z  0.83 mm    0.10 % 250 MeV  z  0.19 mm    1.6 % 4.30 GeV  z  mm    0.71 % 13.6 GeV  z  mm    0.01 % Linac-X L =0.6 m  rf =  21-1 b,c,d...existing linac L0-a,b rfgun 21-3b24-6d X 25-1a30-8c Commission in Jan Commission in Jan. 2008

MMJJJJAASSOONNDDJJFFMMAAMMJJJJ Drive-Laser Install Drive-Laser Commissioning Gun/Inj./BC1 Commissioning May2006 Gun/Inj./BC1 Install linac/BC2 Install First Spont. Light linac/BC2 Commissioning LCLS Installation and Commissioning Time-Line LTU/undulator Commissioning LTU/und. Install AASSOONNDDJJFFMMAAMMJJ JJ FEL Comm. undulator hall ready First FEL Light

Q = 1 nC f = 120 Hz G = 120 MV/m  x,y = 1  m  t = 10 ps I = 100 A RF Photo-Cathode Gun

Slice emittance >1.8  m will not saturate courtesy S. Reiche P = P 0  N = 1.2  m P  P 0 /100  N = 2.0  m electron beam must meet brightness requirements

Complete & Detailed Design (cathode to dump) BC2LTU undulator L3 L2 cathode Full MAD deck at:

after BC1 after X-RF after L1 after DL1 after BC2 after L3 at und. after L2  z = 830  m  z = 190  m  z = 23  m  z = 190  m energy profile phase space time profile Bunch Compression Progression

Location of Main Linac Diagnostics 5+ energy spread meas. stations (optimized with small  )...existing linac L0 rfgun L3L1 X L2  x,y EEEE EEEE EEEE EEEE 5+ emittance meas. stations designed into optics (  x,y ) BPMs at or near most quadrupoles and in each bend syst. RF deflectors for slice  and  E measurements (L0 & L3) EEEE EEEE EEEE EEEE EEEE EEEE T-cav. T-cav.

Slice-Emittance Measurement Simulation RF-deflector at 1 MV slice OTR 10 times  y  bunch length quad scanned 135 MeV

Slice-Emittance Measurement Simulation slice-5 Injector (135 MeV) with S-band RF-deflector at 1 MV = meas. sim. = calc. = y distribution = actual (same SLAC slice-  code used at BNL/SDL) (slice- y -emittance also simulated in BC1-center) DL1 slice-emit on WS02

Transverse RF deflector RF Gun gun spectrometer YAG screen YAGscreen OTR screen & wire YAG screen YAG & OTR OTR screen & wire YAG screen main SLAC Linac Gun/Injector Diagnostics injector spectrometer trajectory (BPMs) emittance (+ slice) energy spread (+ slice) bunch length (+ dist.) charge (+ dark current)

Injector Through BC1 Commissioning  x,y and slice EEEE EEEE RF deflector no laser-heater until 2007

Injector Through BC1 Commissioning (2)  x,y EEEE  E  slice  y stopper relative bunch length monitors X-band RF BC1

Linac-To-Undulator (LTU) 4  -wires, 6 collimators, 1 OTR energy centroid & spread meas. (OTR) (3  10  5 & 10  4 ) + collimation vertical bends  vertical bend 4.7 mr  horizontal jog 1.25 m  energy diagnostics  emit. diagnostics  bunch length diag.  collimators  CSR cancellation  branch points for future undulators  spontaneous undulator possible  vertical bend 4.7 mr  horizontal jog 1.25 m  energy diagnostics  emit. diagnostics  bunch length diag.  collimators  CSR cancellation  branch points for future undulators  spontaneous undulator possible

Enhanced CSR in BC1

Emittance of RF Photo-Cathode Gun Micro-Bunching Instability Bunch Length Monitors CSR in BC1 and BC2 Impedance in BC2 Vacuum Chambers Space-Charge Effects in BC1 Region Chromatic Correction for Highly Chirped Beams Improved LTU Lattice Undulator Wakefields FEL Commissioning and Tuning Start-to-end Simulations and Integration with LCLS Controls ESASE/Replicator Optical Klystron Gain Enhancement Seeded and Self-Seeded FEL for Next Phase of LCLS Development of an X-band Transverse RF Deflector Multi-bunch LCLS and Regenerative Amplifier FEL Harmonic Afterburner