The QClam is one of two magnet spectrometers at the S- DALINAC. It is used for (e,e') and (e,e'x) experiments at various incident beam energies and scattering angles. Electrons which have been scattered from a target nucleus will enter the spectrometer and be deflected by the pentapole and dipole magnet according to their respective impulse. These electrons can then be detected by the position sensitive wire chambers and their energy and scattering angle can be reconstructed.
Additionally it is possible to operate the QClam in 180 degree mode using the schicane. This allows the detection of electrons scattered by 180 degrees, which results in a suppression of longitudinal excitations and thus presents a unique opportunity to study weak vertical excitations.