The vector potential admitted by a solenoidal field is not unique. The solenoidal vector fields are those with . To get around this, she adapted an older form of spectrometer, a solenoidal spectrometer. An incompressible flow is described by a solenoidal flow velocity field. That is, if formula 7 is a solenoidal vector field. The field lines of a solenoidal field are either closed loops or end at infinity. The calorimeters are situated outside the solenoidal magnet that surrounds the Inner Detector. In this case, formula 6 is said to be solenoidal. We see that the component on is always solenoidal. She developed the STAR detector, a solenoidal tracker to measure hadronic particle production. A vortex with helical streamlines is said to be solenoidal. The Noether current is defined up to a solenoidal (divergenceless) vector field. However, it is solenoidal everywhere. Thus solenoidal vector fields are precisely those that have volume-preserving flows. A field which has zero divergence everywhere is called solenoidal.