Cornell Synchrotron Tune Correction

Methods are described for measurement and stabilization of energy dependent transverse tunes observed in the Cornell synchrotron. For this accelerator, operating over an energy range of 0.15 to 5.5 GeV, tune correction is required to compensate the low energy offset contribution of synchrotron magnetic field errors. Without dynamic correction, synchrotron transport losses and beam instability limit injection rates into the CESR collider and may induce long‐term damage in the CLEO detector. In the system described, a real‐time digitization technique [‘‘MIRABILE’’] has been applied for analysis of tune spectra over the energy ramp cycle. FTM (frequency‐time magnitude) plots derived from rapidly‐digitized time domain data are analyzed to determine appropriate correction waveforms for excitation of vertical and horiozontal correction quadrupoles distributed about the synchrotron ring. A description of the synchrotron tune stabilization system and related operational data are presented.