"Response matrix fit at APS: from optics correction to impedance measurements"
Presented by Vadim Sajaev, APS/ANL
Monday, March 18, 2013, 11 am
NSLS-II Seminar Room, Bldg. 817
Hosted by: Samuel Krinsky
Response matrix fit is widely and successfully used for linear lattice and coupling correction at many storage rings. We will discuss its application at the Advanced Photon Source (APS). The main complication in APS case is the size of the problem: APS has 440 BPMs and 320 correctors in each plane and 400 quadrupoles and 280 sextupoles as possible lattice distortion sources. The large problem presents challenges in measurement and computation time. We will discuss the optimization of the total optics correction speed. Ability to precisely measure linear optics also opens up possibility for more advanced measurements like local chromaticity and local impedance measurements. We will describe such measurements and show results.