Machine Experiments at the SPS and RHIC

by Mr R. Calaga (Brookhaven National Laboratory, U.S.A.)

Thursday 17 Jul 2008, 11:00 → 12:00 Europe/Zurich

AB Auditorium Meyrin (CERN)

Accurate knowledge of magnetic optics and correction are fundamental for high intensity colliders like the LHC with tight aperture constraints. Observables like the betatron phase advance which are independent of the BPM calibration errors are key to measure the accelerator optics. As a first test, measurement of phase advances using turn-by-turn BPM orbits at RHIC are presented. A dedicated experiment using known error sources to test optics correction algorithms developed for the LHC is briefly shown.

Similar techniques are employed to measure the intensity dependent betatron phase advance in the SPS. The gradient of the phase advance is used to reconstruct the location of transverse impedance sources. Simulations from HEADTAIL to verify the effectiveness of this technique and measurements from the SPS from 2007 are discussed in detail.

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