Linac Coherent Light Source-II

2 Documents in Project


SCH Number
Lead Agency
United States Department of Energy
Document Title
Linac Coherent Light Source-II
Document Type
EA - Environmental Assessment
Document Description
The Linac Coherent Light Source-II Project (LCLS-II) is a proposed expansion of the existing facility at the SLAC National Accelerator Laboratory (SLAC). The proposed LCLS-II project would consist of an upgrade to the existing LCLS to enhance its experimental capabilities and perform new types of experiments. These upgrades will require dismantling and removing existing equipment and utilities within Sectors 0 through 10 of the existing accelerator housing and klystron gallery and installing new superconducting accelerator equipment. It would also require upgrades to existing LCLS equipment and utilities. It would also require upgrades to existing LCLS equipment and utilities including those contained in the Beam Transport Hall (BTH), Undulator Hall (UH), Near Experimental Hall (NEH), and Far Experimental Hall (FEH). One of the upgrades would be the installation of a second beamline, which would accommodate additional researchers and allow completion of more experiments. To provide new capabilities, SLAC may construct up to two cryogenic plants to produce extremely cold liquid helium and circulate it through the superconducting accelerator equipment via new utility connections. The primary cryogenic plant would be located near Sector 4 of the existing klystron gallery and would consist of a steel-frame building to house compressors and control rooms.

Contact Information

Mitzi Heard
Agency Name
U.S. Department of Energy
Contact Types
Lead/Public Agency


Menlo Park
San Mateo
Cross Streets
I-280/Sand Hill Rd.
Parcel #
State Highways
5 Schools within 1 mile
San Francisquito Creek

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Energy Commission, California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Department of Water Resources, Office of Historic Preservation, Resources Agency
Development Types
Other (Federal Research and Development Project)
Local Actions
Project Issues
Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Economics/Jobs, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Noise, Population/Housing, Solid Waste, Transportation, Vegetation

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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