Welcome to the Workshop LCLS Status Since the January Workshop Charge 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu Linac-to-Undulator (227m) Undulator Hall (175m) Beam Dump (40M) Front End (29m) X-ray Near Transport Expt. (250m) Far Expt. Hall Hall 3rd Undulator Line 2nd Undulator Line 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu Capacity- 300 68,300 GSF Total 150-Seat Auditorium 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu 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 CD-0 CD-1 CD-2a Title I CD-2b Design XFEL Commissioning CD-3b Complete FY2001 FY2002 FY2003 2002 2003 FY2004 Project Engineering Design 2004 FY2005 Long-Lead Procurement 2005 FY2006 2006 FY2007 FY2008 Construction CD-3a 22 September 2004 Welcome/Charge LCLS Commissioning Workshop FY2009 Operation CD-4 John N. Galayda galayda@slac.stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center 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? LCLS Undulator Diagnostics Workshop Opening Comments and Charge 19 January 2004 John N. Galayda, SLAC galayda@slac.stanford.edu Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center 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 LCLS Undulator Diagnostics Workshop Opening Comments and Charge 19 January 2004 John N. Galayda, SLAC galayda@slac.stanford.edu 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 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu 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 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu 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 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu Welcome! Thanks for Coming! 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu End of Presentation 22 September 2004 Welcome/Charge LCLS Commissioning Workshop John N. Galayda galayda@slac.stanford.edu