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SLAC has several Globus endpoints, including one for LCLS (slac#lclslcls_pcds). To obtain access the Globus LCLS endpoint, please send an email to data-management. Once enabled to use Globus with LCLS, the user can use their SLAC Unix username/password to authenticate with endpoint slac#lclsendpoint lcls_pcds.
For more information about Globus, including documentation, support, and troubleshooting, check out the resources at the bottom of globus.org. If you suspect that a problem is SLAC/LCLS specific, please contact unix-admin@slac.stanford.edu.