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Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 1 LCLS Commissioning Status P. Emma for The.

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Presentation on theme: "Paul Emma LCLS Commissioning Status Nov. 11, 2008 SLAC National Accelerator Laboratory 1 LCLS Commissioning Status P. Emma for The."— Presentation transcript:

1 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

2 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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 0.7-1.6  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 0.14- 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

3 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu Nov. 11, 2008 SLAC National Accelerator Laboratory 3 Design and Typical Measured Parameters (Aug. 2008) Parametersymboldesignmeasuredunit Final linac e  energy  mc 2 13.613.6MeV Bunch charge Q10.25nC Initial bunch length (rms)  z0 0.90.75mm Final bunch length (rms)  zf 208-10 mmmm Projected emittance (injector)  x,y 1.20.7-1.0 μmμmμmμm Slice emittance (injector)  s x,y 1.00.6 μmμmμmμm Projected emittance (linac end)  L x,y 1.5 0.7, 1.6* μmμmμmμm Single bunch repetition rate f12030Hz RF gun field at cathode EgEgEgEg120115MV/m Laser energy on cathode ulululul25020-150 μJμJμJμJ Laser diameter on cathode 2R2R2R2R1.51.2mm Cathode quantum efficiency QE60.7-7 10  5 * horizontal slice emittance likely < 1 µ m

4 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

5 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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, 2008 00:01 to May 27 09:00  (  x  y ) 1/2 = 1.04  m

6 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

7 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

8 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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  10 11 photons I pk = 4.8 kA   0.4 µm SIMULATED FEL PULSE

9 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu Nov. 11, 2008 SLAC National Accelerator Laboratory 9 120-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

10 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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…

11 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

12 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

13 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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

14 Paul Emma LCLS Commissioning Status Emma@SLAC.Stanford.edu 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 2008 2009 2010 2008 2009 2010 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

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

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