Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Magnetic Measurements and Alignment Issues

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Undulator Alignment Process Optical Alignment requires direct line of sight between instrument and target  fiducials need to be either on aisle side or on top of component Optical Alignment requires direct line of sight between instrument and target  fiducials need to be either on aisle side or on top of component

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Alignment Operation and Tolerances (PM Quads) Quadrupole alignment Quadrupoles too small to carry fiducials is accomplished by relative alignment to adjacent undulator Carried out in MMF using CMM, no optical alignment involved undulator wrt to BBA-aligned quadrupoles relative alignment requirements: 70 µm in Y, 300 µm in X Using the undulator fiducials to align quadrupoles: fiducialization quadrupole axis to quadrupole fiducials to undulator fiducials X, Y 30 µm Undulator Cradle, quadrupole, BPM are aligned wrt undulator fiducials Carried out by optical alignment, supported by HLS and portable stretched wire measurements Quadrupole ab-initio position tolerance driven by BBA requirements; BBA quality is correlated to quality of initial alignment – mover motion range is about 3-times StD of alignment  BBA residual offsets are among others a function of quality of initial alignment Alignment StD of 150 µm sufficient for BBA to converge, goal is alignment StD of < < 100 µm Quadrupole alignment Quadrupoles too small to carry fiducials is accomplished by relative alignment to adjacent undulator Carried out in MMF using CMM, no optical alignment involved undulator wrt to BBA-aligned quadrupoles relative alignment requirements: 70 µm in Y, 300 µm in X Using the undulator fiducials to align quadrupoles: fiducialization quadrupole axis to quadrupole fiducials to undulator fiducials X, Y 30 µm Undulator Cradle, quadrupole, BPM are aligned wrt undulator fiducials Carried out by optical alignment, supported by HLS and portable stretched wire measurements Quadrupole ab-initio position tolerance driven by BBA requirements; BBA quality is correlated to quality of initial alignment – mover motion range is about 3-times StD of alignment  BBA residual offsets are among others a function of quality of initial alignment Alignment StD of 150 µm sufficient for BBA to converge, goal is alignment StD of < < 100 µm

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Alignment Fiducials and Abbe’s Law Abbe’s Law postulates that in order to avoid 1 st order errors, the measurement needs to take place in the principle plane of the dimension Hence: Horizontal measurement wrt fiducial in horizontal plane Vertical measurement wrt fiducial in vertical Abbe’s Law postulates that in order to avoid 1 st order errors, the measurement needs to take place in the principle plane of the dimension Hence: Horizontal measurement wrt fiducial in horizontal plane Vertical measurement wrt fiducial in vertical

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Effect of violating Abbe’s Law (1) Already placing the top fiducial not exactly in vertical plane of rotation creates too much of a roll correlation, assuming 1 mrad roll Need to change fiducial position into plane of rotation, or need to control roll about 0.1 mrad Already placing the top fiducial not exactly in vertical plane of rotation creates too much of a roll correlation, assuming 1 mrad roll Need to change fiducial position into plane of rotation, or need to control roll about 0.1 mrad

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Effect of violating Abbe’s Law (2) Roll Tolerance presently defined = 1mrad To reduce roll correlation to become insignificant, tolerance needs to be 0.1 mrad This requires to set elevation of both fiducials to better than 10 µm  cannot be done with optical measurements Roll Tolerance presently defined = 1mrad To reduce roll correlation to become insignificant, tolerance needs to be 0.1 mrad This requires to set elevation of both fiducials to better than 10 µm  cannot be done with optical measurements

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC “Gap open to Aisle” Fiducial Design Gap open to aisle requires two fiducials per cross- section on top of undulator Additionally, two reference surfaces to set roll using machinist level, one near either end Do we need roll reference in any case, e.g. is present roll tolerance consistent with vacuum chamber stay clear? Gap open to aisle requires two fiducials per cross- section on top of undulator Additionally, two reference surfaces to set roll using machinist level, one near either end Do we need roll reference in any case, e.g. is present roll tolerance consistent with vacuum chamber stay clear?

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC MMF Lay-out

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC New MMF lay-out Modified Lay-out Highlights Separation of magnetic measurements operation from fiducialization and assembly Allows different temperature zones: mag.meas +/-0.1degC CMM / assembly+/- 1 degC Loading / Storage+/- 2.5degC Assembly line type lay-out Storage capacity for most (all) undulator segments Modified Lay-out Highlights Separation of magnetic measurements operation from fiducialization and assembly Allows different temperature zones: mag.meas +/-0.1degC CMM / assembly+/- 1 degC Loading / Storage+/- 2.5degC Assembly line type lay-out Storage capacity for most (all) undulator segments

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Installation Schedule

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Installation and Alignment Schedule: Assumptions Goal: Get ready for commissioning in July / August 2007 SPEAR3 approach, complete as much work as possible before installation during pre-assembly Aggressive concurrent scheduling Optimize time not man-power Only one shift work Goal: Get ready for commissioning in July / August 2007 SPEAR3 approach, complete as much work as possible before installation during pre-assembly Aggressive concurrent scheduling Optimize time not man-power Only one shift work

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Pre-assembly of installation units Pre-assembled granite tables and cradles Pre-assembly of granite tables Mount support feet Mount support table and mechanical adjustment system Mount cam movers Install temperature acquisition system Install temperature insulation Complete cabling, plug-in ready Pre-align table supports and undulator supports Pre-assembly of cradles Attach cam mover kinematics Install roll-away rails (& mover system) Install undulator, quadrupole and BPM Install vacuum system Complete cabling, plug-in ready Fiducialize and align Pre-assembled granite tables and cradles Pre-assembly of granite tables Mount support feet Mount support table and mechanical adjustment system Mount cam movers Install temperature acquisition system Install temperature insulation Complete cabling, plug-in ready Pre-align table supports and undulator supports Pre-assembly of cradles Attach cam mover kinematics Install roll-away rails (& mover system) Install undulator, quadrupole and BPM Install vacuum system Complete cabling, plug-in ready Fiducialize and align

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Alignment Scheme All components use registration keys to preserve pre-alignment Install and measure alignment network Install floor anchors and foot plates Align foot plates to better than 0.5 mm Install granite tables onto foot plates Re-measure alignment network Align undulator mechanical supports Install cradles Install HLS and WPM Re-measure alignment network Align undulators All components use registration keys to preserve pre-alignment Install and measure alignment network Install floor anchors and foot plates Align foot plates to better than 0.5 mm Install granite tables onto foot plates Re-measure alignment network Align undulator mechanical supports Install cradles Install HLS and WPM Re-measure alignment network Align undulators

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Installation and Alignment Schedule (Version 0.1)

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Integration

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Integrating Monitoring Systems into Cradle / Support System Since the cradle needs to be easily removable, we cannot attach the monitoring systems to it. Hence, both WPM and HLS need to be mounted to support table. However, the mounting has to be accomplish in a way which will force the sensors to follow the cradle motion

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Integrating Monitoring Systems into Cradle / Support System

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC HLS Stability and Resolution

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC Integrating Monitoring Systems into Cradle / Support System

Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Undulator Physics and Engineering June 28 & 29, 2004 Robert Ruland, SLAC WPM Stability and Resolution