SLAC National Accelerator Laboratory LCLS Commissioning Status P

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

SLAC National Accelerator Laboratory 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 0. 7 -1. 6 mm at 0. 25 n. C, 10 Ge. V Routine 30 -Hz e- to 14 Ge. V (~24/7 with ~90% up-time) Bunch compression fully demonstrated down to 1 -2 µm New cathode installed with greatly improved thermal emittance 20 -p. C bunch with 0. 14 -µm 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 Nov. 11, 2008 LCLS Commissioning Status 2 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory Design and Typical Measured Parameters (Aug. 2008) Parameter symbol design measured unit gmc 2 13. 6 Me. V Bunch charge Q 1 0. 25 n. C Initial bunch length (rms) sz 0 0. 9 0. 75 mm Final bunch length (rms) szf 20 8 -10 mm Projected emittance (injector) gex, y 1. 2 0. 7 -1. 0 μm Slice emittance (injector) gesx, y 1. 0 0. 6 μm Projected emittance (linac end) ge. Lx, y 1. 5 0. 7, 1. 6* μm f 120 30 Hz RF gun field at cathode Eg 120 115 MV/m Laser energy on cathode ul 250 20 -150 μJ Laser diameter on cathode 2 R 1. 5 1. 2 mm Cathode quantum efficiency QE 6 0. 7 -7 10 -5 Final linac e- energy Single bunch repetition rate Nov. 11, 2008 LCLS Commissioning Status * horizontal slice emittance likely < 1 µm 3 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory Bunch Compression & CSR Measured after BC 2 (0. 25 n. C) nominal sz < 5 m m sz 2 m m old screen used sz > 25 mm L 2 BC 2 (4. 3 Ge. V) Nov. 11, 2008 LCLS Commissioning Status TCAV (5. 0 Ge. V) 4 550 m 4 wires BSY (14 Ge. V) Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory Emittance Near End of Linac Over Long Weekend g(exey)1/2 = 1. 04 mm long weekend run at 0. 25 n. C with no tuning (3. 3 days) May 24, 2008 00: 01 to May 27 09: 00 Nov. 11, 2008 LCLS Commissioning Status 5 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory Beam Appears Bright Enough for FEL Saturation at 0. 15 nm M. Xie method, with wakes FEL Power 3 D Gain Length 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) Nov. 11, 2008 LCLS Commissioning Status 6 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory New Cathode: Time-sliced x-Emittance at Very Low Charge 0. 14 µm TAIL (not same data) 20 p. C, 135 Me. V, 0. 6 -mm spot diameter, 400 µm rms bunch length (5 A) Nov. 11, 2008 LCLS Commissioning Status 7 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory Measurements and Simulations for 20 -p. C Bunch at 14 Ge. V sz 1 m m ? Li. Track (no CSR) 8 k. A? Photo-diode signal on OTR after BC 2 shows minimum compression at -34. 5 deg L 2 -linac phase. SIMULATED FEL PULSE 1. 5 Å, Y. Ding 3. 6 1011 photons Ipk = 4. 8 k. A ge 0. 4 µm LCLS FEL simulation at 1. 5 Å based on measured injector beam and Elegant tracking with CSR at 20 p. C. Horizontal projected emittance measured at 10 Ge. V, after BC 2, using 4 wire-scanners. Nov. 11, 2008 LCLS Commissioning Status 8 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory 120 -Hz RF & Controls Testing Done (Gun, L 0 a, L 0 b, L 1 -S, & L 1 -X) Measured 120 -Hz “Timeslot” phase jitter for all injector RF stations: Gun, L 0 a, L 0 b ~0. 8 deg rms (tol. = 0. 1 deg) L 1 S ~0. 17 deg rms (tol. = 0. 1 deg) L 1 X ~0. 3 deg rms (tol. = 0. 5 deg) Observe ~1 deg difference on every 4 th pulse (L 0 a, L 0 b, L 1 X) 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 Nov. 11, 2008 LCLS Commissioning Status 9 Paul Emma@SLAC. Stanford. edu

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

SLAC National Accelerator Laboratory RF Gun Solenoid L 0 a Gun Spectrometer OTR screens (7) YAG screens (7) Wire scanners (7) Dipole magnets (8) Beam stoppers (2) S-band RF acc. sections (5) Laser-Heater L 0 b Emittance Screens/Wires Emittance Screen/Wires RF Deflector 2 -km point in 3 -km SLAC linac 135 -Me. V Spectrometer L 1 S 135 Me. V LCLS Commissioning Status TD 11 stopper 250 Me. V RF Deflector (LOLA) + special lattice configuration in spectrometer allows fine measurement of time-sliced energy spread (to <6 ke. V) Nov. 11, 2008 X-band RF BC 1 acc. section 11 s. E 6 ke. V rms (40 mm) Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory New emittance data at 135 Me. V taken on Nov. 8, 2008 just 2 days into the turn-on gex = 0. 61 µm q = 0. 25 n. C gey = 0. 67 µm Nov. 11, 2008 LCLS Commissioning Status 12 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory 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 Nov. 11, 2008 LCLS Commissioning Status 13 Paul Emma@SLAC. Stanford. edu

SLAC National Accelerator Laboratory CD-4 (7/31/2010) First Light in FEH Hutch BO X-Rays in NEH First Light in FEE Install Undulators FEE/NEH Install PPS Cert. LTU/Dump now LTU/Und Install PEP-II run ends LCLS Installation and Commissioning Time-Line PPS J F M A M J J A S ON D J F M A M J J Down? 2008 2009 2010 Linac/BC 2 Commissioning Nov. 11, 2008 LCLS Commissioning Status LTU/Und NEH Ops & Commissioning Re-establish FEL/FEE e- to SL 2 Commissioning 14 Nov. 3, 2008 Paul Emma@SLAC. Stanford. edu

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