1. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Welcome to the Workshop LCLS Status Since the January Workshop Charge

2. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Linac-to-Undulator (227m) Undulator Hall (175m) Beam Dump (40M) Front End (29m) Near Expt. Hall X-ray Transport (250m) Far Expt. Hall 2 nd Undulator Line 3 rd Undulator Line

3. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Capacity- 300 68,300 GSF Total 150-Seat Auditorium

4. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge LCLS - Estimated Cost, Schedule $273M Total Estimated Cost (includes $59.7M contingency) $315M Total Project Cost FY2005 Long-lead purchases for injector, undulator FY2006 Construction begins FY2008 Q2 FEL Commissioning begins September 2008 Construction complete – operations begin 20022003200420052006FY2008FY2009 Construction Operation FY2001FY2002FY2003FY2004FY2005FY2006FY2007 CD-1CD-2aCD-2b CD-3a CD-3b CD-0 Title I Design Complete XFEL Commissioning CD-4 Project Engineering Design Long-Lead Procurement

5. Opening Comments and Charge 19 January 2004 galayda@slac.stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Diagnostics Workshop John N. Galayda, SLAC Challenges for Diagnostics in the Undulator Channel Tolerances on Trajectory are Tight for SASE at 1.5Å Beam-based alignment, RFBPMs must deliver a good trajectory Tolerance on K of an undulator is around 1.5 x 10 -4 Equivalent to 50 micron vertical misplacement This displacement does little to the electron optics This displacement does little to the spontaneous spectrum of 1 und. Piezo end tuners provide adjustment equivalent to K~ 4x10 -4 Radiation Damage to Undulators is a Concern Interlocks will be implemented but tolerable losses are low Can the diagnostics identify a damaged undulator? Tolerances on Trajectory are Tight for SASE at 1.5Å Beam-based alignment, RFBPMs must deliver a good trajectory Tolerance on K of an undulator is around 1.5 x 10 -4 Equivalent to 50 micron vertical misplacement This displacement does little to the electron optics This displacement does little to the spontaneous spectrum of 1 und. Piezo end tuners provide adjustment equivalent to K~ 4x10 -4 Radiation Damage to Undulators is a Concern Interlocks will be implemented but tolerable losses are low Can the diagnostics identify a damaged undulator?

6. Opening Comments and Charge 19 January 2004 galayda@slac.stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Diagnostics Workshop John N. Galayda, SLAC Will the Undulator Diagnostics Serve Commissioning and Operations Needs for the LCLS? Charge – Will the Undulator Diagnostics Serve Commissioning and Operations Needs for the LCLS? Commissioning Can diagnostics be used to troubleshoot the new hardware? Can diagnostics be used to guide path to saturation? Operations Will the diagnostics permit simple and speedy troubleshooting? Reliability/Availability goals of the LCLS will be those of a light source Light diagnostics are crucial Can the diagnostics survive at high power? If not, are we placing too heavy a reliance on data taken with low charge? What are the alternatives? Variable gap? Rollaway undulators? Do we have redundant diagnostics capability where appropriate? Diagnostics that check the diagnostics Commissioning Can diagnostics be used to troubleshoot the new hardware? Can diagnostics be used to guide path to saturation? Operations Will the diagnostics permit simple and speedy troubleshooting? Reliability/Availability goals of the LCLS will be those of a light source Light diagnostics are crucial Can the diagnostics survive at high power? If not, are we placing too heavy a reliance on data taken with low charge? What are the alternatives? Variable gap? Rollaway undulators? Do we have redundant diagnostics capability where appropriate? Diagnostics that check the diagnostics

7. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Since the January Workshop K adjustment in undulators implemented by “canted” poles – Adjustment range 0.56% achieved by horizontal translation of undulator We took the extra step to “rollaway” undulators Electromagnet quadrupoles to be in baseline Beam-based alignment via 20% strength variation Coarse steering by cam movers under und. + quads Fine steering by dipole trims on quads

8. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Undulator Diagnostics Wire scanners/CTR monitors every 3rd undulator NO inter-undulator x-ray diagnostics End-of-undulator spectrometer as x-ray pulse length diagnostic Subject of DESY/SLAC XFEL2004 workshop http://www-ssrl.slac.stanford.edu/lcls/xfel2004/index.html Improved understanding of spontaneous radiation shallow-angle reflection in beam pipe Ideas for spectrometric diagnostics

9. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Charge is Expanded: Will the LCLS Diagnostics Serve Commissioning and Operations Needs for the LCLS? Last workshop we assumed the electron beam to be completely understood upstream of the undulator This time we expand scope to consider start-to-end diagnostics Goal: diagnostics to guide us from gun to SASE to characterization of x-ray beam Diagnostics to understand the beam in detail Diagnostics for feedback control (fluence, bunch length, etc.) Diagnostics to troubleshoot problems along entire electron beam path We’d love to measure gain versus z for poor gain- was a blind spot Do end-of-undulator x-ray diagnostics look like a viable commissioning/operation tool? Alternative approaches to be considered? Lock-in on modulation of electron beam properties? Other ideas? Diagnostics to provide data required for x-ray experiments A recent concern of mine: diagnostics for wake field effects in undulator channel

10. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge Welcome! Thanks for Coming!

11. John N. Galayda LCLS Commissioning Workshopgalayda@slac.stanford.edu 22 September 2004 Welcome/Charge End of Presentation