Redesign of the A4 calorimeter for the measurement at backward angles
Backward angle measurements of the parity violating asymmetry in elastic electron proton scattering are planned with the A4 calorimeter. At present the experiment measures at forward angles. For the measurement at backward angles the support of the PbF2-detector has to be redesigned. For this purpose it will be positioned on a rotatable platform, so that measurements at forward and backward angles will be possible with little effort. We will highlight the new experimental setup and its special features.