An experiment shaped like a barbell (IMAGE)
Caption
The experimental apparatus is shaped roughly like a barbell, with two boxy vacuum chambers at the ends and beam pipes connecting them. X-ray pulses travel from the front cavity chamber to the back one through one pipe, then back to the front cavity through the other pipe, completing a 46-foot loop. Diamond mirrors inside the cavities guide the pulses along precisely the right path.
Credit
Diling Zhu/SLAC National Accelerator Laboratory
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