The helium (damping) gas regulator controls the flow of UHP helium gas into the dual-pressure linear ion trap analyzer cavity. Helium gas enters the left side of the MS through a 1/8 in. port. The MS regulates the flow of helium gas and delivers it to the ion trap.
Helium gas in the ion trap cavity dampens ionic motion and improves the performance of the MS. For more information, see Helium Damping Gas.