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TY - CONF AU - Yang, X. AU - Huang, X. AU - Safranek, J.A. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - LOCO Application to NSLS2 SR Dispersion and Beta Beating Correction J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - During the short run in early July, 2014, we made changes to the Matlab LOCO setup for NSLS-II and applied LOCO successfully to the machine. The MML setup was verified with I/O tests for all quadrupole families. The LOCO setup was further tested with an intentional quadrupole error. After the successful LOCO correction, the rms beta beat was reduced from the initial values of 5.5% x and 5.6% y, to 1.9% x and 1.0% y, respectively. The rms horizontal dispersion error was reduced from 21 mm to 6 mm. It is critical to keep the same closed orbit for LOCO correction to take effect. Because presently some correctors are nearly saturated, closed orbit cannot be controlled for additional iterations. We expect LOCO to achieve better optics correction after the orbit control is improved. PB - JACoW CP - Geneva, Switzerland SP - 1989 EP - 1992 KW - quadrupole KW - optics KW - storage-ring KW - ion KW - lattice DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-TUPHA012 UR - http://jacow.org/ipac2015/papers/tupha012.pdf ER -