Greg Stewart

This animation shows how krypton (red) is removed from xenon gas (blue) by flowing the combined gases through a column of charcoal (black specks). Both elements stick to the charcoal, but krypton is not as strongly attached and gets swept...

A cross section of the LCLS-II accelerator showing where liquid and gaseous helium flow in and out of the system.

A schematic of the LCLS-II cryoplant.

Now that the cavities have been cooled, the next step is to pump them with more than a megawatt of microwave power to accelerate the electron beam from the new source. Electrons passing through the cavities will draw energy from...

A half-mile-long stretch of tunnel in Menlo Park, California is now colder than most of the universe.

The linac is equipped with two world-class helium cryoplants.