PETRA Bunch Rotation

The upgrade of the Petra bunch rotation scheme for protons will be described. Bunch compression in Petra is necessary for stable longitudinal transfer matching with Hera. The influence of beam loading in Petra has to be taken into account for currents above 50 mA even though a strong fast rf feedback system is installed. Amplitude modulation in a short push-pull cycle is chosen for bunch rotation and a bunch length compression factor of 0.7 is established with tolerable distortion

Longitudinal Schottky Signal Monitoring for Protons in HERA

Stable longitudinal behavior of the protons is an important feature for future HERA operation. Specific diagnostic tools must be developed for this reason. In this case a standard wall current monitor is used to detect a beam signal from the incoherent motion of the protons due toboth coasting beam and synchrotron oscillations during luminosity operation. This will be helpful to understand the process of coasting beam production in HERA. The coherent rotation harmonics from the bunched beam are strongly suppressed to enable amplification of the Schottky signal. The signal processing will be described and measurements at HERA will be presented