Pressure profile as measured along the JENSA gas jet target system. The pressure gradient inside of each aperture is treated as a discrete step for the purposes of display. The blue star at the jet location shows the measured pressure at the inlet of the jet nozzle; the solid blue curve at the jet location shows the derived pressure of the jet after expansion into the chamber (in other words, as “seen” by a beam). Note the log scale on
the vertical axis.