Author :
Cameron, P. ; Cerniglia, P. ; Connolly, R. ; Cupolo, J. ; Dawson, W.C. ; Degen, C. ; DellaPenna, A. ; DeLong, J. ; Drees, A. ; Huhn, A. ; Kesselman, M. ; Marusic, A. ; Oerter, B. ; Mead, J. ; Schultheiss, C. ; Sikora, R. ; van Zeijts, J.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
Abstract :
Preliminary phase-locked loop betatron tune measurement results were obtained during RHIC 2000 with a resonant Beam Position Monitor. These results suggested the possibility of incorporating PLL tune measurement into a tune feedback system for RHIC 2001. Tune feedback is useful in a superconducting accelerator, where the machine cycle time is long and inefficient acceleration due to resonance crossing is not comfortably tolerated. This is particularly true with the higher beam intensities planned for RHIC 2001. We present descriptions of a PLL tune measurement system implemented in the DSP/FPGA environment of a RHIC BPM electronics module and the feedback system into which the measurement is incorporated to regulate tune. In addition, we present results from the commissioning of this system during RHIC 2001
Keywords :
accelerator control systems; colliding beam accelerators; feedback; ion accelerators; particle beam diagnostics; phase locked loops; storage rings; DSP/FPGA environment; PLL tune measurement; RHIC; machine cycle time; phase-locked loop betatron tune measurement; resonance crossing; resonant beam position monitor; superconducting accelerator; tune feedback system;
