Metrology Department

SLAC Projects

The Alignment Engineering Group (AEG) provides alignment and geodetic services for SLAC. Currently the Linac Coherent Light Source (LCLS) and the Stanford Positron Electron Accelerating Ring (SPEAR3) are the main users of AEG services:


LCLS-II alignment tasks have pushed the state-of-the-art in terms of highly accurate and precise alignment techniques and equipment. This free-electron x-ray laser requires extremely well aligned components-especially in the Undulator Hall where successful self-amplified spontaneous emission (SASE) of x-rays requires a series of precisely aligned undulator magnets and components. LCLS presents the challenge of aligning the entire 2 kilometers of new components in narrow tunnels while also having only limited external tunnel access for outside survey network control.

FACET is an advanced plasma acceleration facility that will provide high energy density electron and positron beams focused down to 10x10 um spot size. New and many re-used beam-line components are used in this facility creating challanges in terms of successful alignment with equipment that may not have been originally designed for this new facility.

SPEAR3 is the Stanford Synchrotron Radiation Laboratory's (SSRL) third generation synchrotron light source that has been operating successfully since commissioning in March 2004. For installation, the AEG was involved in alignment tasks relating to the concrete floor, girder pre-alignment, component fiducialization, and installation of the new SPEAR3 ring. Alignment efforts continue in tasks dealing with component quality control, fiducialization and installation of new ring components and beamlines. A Hydrostatic Leveling System (HLS) and length gauge have been added to study and continuously monitor floor height for ring and beamline trajectories.


Ongoing Projects

Past Projects

The AEG and its predecessors have been involved in almost every large experiment at SLAC. Past experiments include the Stanford Linear Collider (SLC), End Station A, the Final Focus Test Beam (FFTB), the Next Linear Collider Test Accelerator (NLCTA), and the Positron Electron Project (PEP). Below are links to some archived alignment information on some significant AEG projects including GLAST (Gamma Ray Large Area Space Telescope), SABER (South Arc Beam Experimental Region), and the next generation PEP-II project including the B-Factory.


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Last update: November 07, 2012