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LCLS does everything it can to make the most of The Laser and it's associated tools of characterization available available for public use. But there is a rigorous and competitive select selection process that takes detailed technical proposals and months (often years) of planning + prep. And the actual use of the laser will come down to a few days with long, strange hours (LCLS runs 24 hours a day). Use of LCLS is free to the selected applicants (called users), but it costs thousands (hundreds of thousands?) of dollars an hour to operate.
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