Orbit and Optics Improvement by Evaluating the Nonlinear BPM Response in CESR

Details Orbit and Optics Improvement by Evaluating the Nonlinear BPM Response in CESR Orbit and Optics Improvement by Evaluating the Nonlinear BPM Response in CESR

2004-06-28

arxiv.org/abs/physics/0406145v1

Phys.Rev.ST Accel.Beams 8:062802,2005

Physics

Accelerator Physics

7 pages, 11 figures

Scientific paper

10.1103/PhysRevSTAB.8.062802

We present an improved system for orbit and betatron phase measurement utilizing nonlinear models of BPM pickup response. We first describe the calculation of the BPM pickup signals as nonlinear functions of beam position using Green's reciprocity theorem with a two-dimensional formalism. We then describe the incorporation of these calculations in our beam position measurements by inverting the nonlinear functions, giving us beam position as a function of the pickup signals, and how this is also used to improve our measurement of the betatron phase advance. Measurements are presented comparing this system with the linearized pickup response used historically at CESR.

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