Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 1 LCLS Commissioning Status P. Emma for The LCLS Commissioning Team LCLS FAC Meeting November 11, 2008 LCLS Machine Performance Estimated FEL Power Ultra-Short Pulse Possibilities Plans for 2009 Results published in FEL’08 and Linac’08 proceedings

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 2 Phase-II Commissioning Highlights (2008) Injector Commissioning: Apr-Aug, 2007 (DONE) Phase-II Commissioning: Dec-Aug, 2008 (DONE) Great drive-laser uptime (99%) and good performance Projected emittances  m at 0.25 nC, 10 GeV Routine 30-Hz e  to 14 GeV (~24/7 with ~90% up-time) Bunch compression fully demonstrated down to 1-2 µ m New cathode installed with greatly improved thermal emittance 20-pC bunch with µ m emittance (and 2-fs length?) Electron bunch appears bright enough to drive 1.5-Å FEL Phase-III commissioning started Nov. 3, 2008 – X-rays by July ‘09

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 3 Design and Typical Measured Parameters (Aug. 2008) Parametersymboldesignmeasuredunit Final linac e  energy  mc MeV Bunch charge Q10.25nC Initial bunch length (rms)  z mm Final bunch length (rms)  zf mmmm Projected emittance (injector)  x,y μmμmμmμm Slice emittance (injector)  s x,y μmμmμmμm Projected emittance (linac end)  L x,y , 1.6* μmμmμmμm Single bunch repetition rate f12030Hz RF gun field at cathode EgEgEgEg120115MV/m Laser energy on cathode ulululul μJμJμJμJ Laser diameter on cathode 2R2R2R2R1.51.2mm Cathode quantum efficiency QE  5 * horizontal slice emittance likely < 1 µ m

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 4 Bunch Compression & CSR Measured after BC2 (0.25 nC)  z > 25  m BC2 (4.3 GeV) BSY (14 GeV) TCAV (5.0 GeV) 550 m  z < 5  m old screen used L2 4 wires  z  2  m nominal

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 5 long weekend run at 0.25 nC with no tuning Emittance Near End of Linac Over Long Weekend (3.3 days) May 24, :01 to May 27 09:00  (  x  y ) 1/2 = 1.04  m

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 6 Beam Appears Bright Enough for FEL Saturation at 0.15 nm Calculation based on measured end-of-linac projected emittance values, measured peak current, and design undulator parameters (assuming undulator alignment and  0.01% rms slice energy spread – not yet measurable) M. Xie method, with wakes FEL Power 3D Gain Length FEL Power 3D Gain Length

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 7 New Cathode: Time-sliced x-Emittance at Very Low Charge 20 pC, 135 MeV, 0.6-mm spot diameter, 400 µm rms bunch length (5 A) TAIL (not same data) 0.14 µm

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 8  z  1  m ? 8 kA? LiTrack (no CSR) Measurements and Simulations for 20-pC Bunch at 14 GeV Photo-diode signal on OTR after BC2 shows minimum compression at  34.5 degL2-linac phase. Photo-diode signal on OTR after BC2 shows minimum compression at  34.5 deg L2-linac phase. Horizontal projected emittance measured at 10 GeV, after BC2, using 4 wire-scanners. Y. Ding LCLS FEL simulation at 1.5 Å based on measured injector beam and Elegant trackingwith CSR at 20 pC. LCLS FEL simulation at 1.5 Å based on measured injector beam and Elegant tracking with CSR at 20 pC. 1.5 Å, 3.6  photons I pk = 4.8 kA   0.4 µm SIMULATED FEL PULSE

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory Hz RF & Controls Testing Done (Gun, L0a, L0b, L1-S, & L1-X) Measured 120-Hz “Timeslot” phase jitter for all injector RF stations: Gun, L0a, L0b ~0.8 deg rms (tol. = 0.1 deg) L1S ~0.17 deg rms (tol. = 0.1 deg) L1X ~0.3 deg rms (tol. = 0.5 deg) Observe ~1 deg difference on every 4th pulse (L0a, L0b, L1X) Measurements confirmed with old SLC control system and new Beam Synchronous Acquisition system More feedback development is needed (beam-based and RF-based) Radiation measured are below posted limits at each klystron Gun temperature and vacuum response OK at 120 Hz M. Stanek

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 10 The LCLS Laser Heater is Ready (except undulator) IR & e- beams on OTR screens now Controls ready Beam through chicane already…

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 11 RF Deflector (LOLA) + special lattice configuration in spectrometer allows fine measurement of time-sliced energy spread (to <6 keV)  E  6 keV rms (40  m) OTR screens (7) YAG screens (7) Wire scanners (7) Dipole magnets (8) Beam stoppers (2) S-band RF acc. sections (5) RF Gun Solenoid GunSpectrometer RFDeflector X-band RF acc. section BC1 L1S L0a L0b 2-km point in 3-km SLAC linac 135-MeVSpectrometer EmittanceScreens/Wires EmittanceScreen/Wires 135 MeV 250 MeV TD11stopperLaser-Heater

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 12 q = 0.25 nC  x = 0.61 µm  y = 0.67 µm New emittance data at 135 MeV taken on Nov. 8, 2008 just 2 days into the turn-on

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 13 Important Dates for 2008/2009 Commissioning Nov. 3, 2008:Startup (establish beam to end of linac again) Dec. 3, 2008:Install laser-heater undulator (?) Dec. 15, 2008:First beam through LTU & to dump? Dec. 19, 2008:SLAC shuts down for holidays Jan. 5, 2009:Startup again (establish beam in LTU & dump) March 2, 2009:Install ~25 undulators & PPS cert. (~2 wks) May 14, 2009:First beam in FEE July 2009:Photons in NEH August 2009:Start AMO Experiment

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 14 Re-establish e  to SL2 LTU/UndComm. First Light in FEE First Light in FEH NEH Ops & Commissioning JJFFMMAAMMJJJJAASSDDJJFFMMAAMMJJJJAASSOONNDDJJFFMMAAMMJJJJ ON A A Down PPS Linac/BC2 Commissioning FEL/FEECommissioning Nov. 3, 2008 Install Undulators M M D D LCLS Installation and Commissioning Time-Line LTU/Und Install PEP-II run ends FEE/NEH Install PPS Cert. LTU/Dump CD-4 (7/31/2010) X-Rays in NEH now D D Down? FEH Hutch BO

Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 15 LTU/Undulator/FEE/FEL Commissioning H. Tompkins + heater