PAC2013 - List of Authors (Tomas, R.)

Paper	Title	Page
TUPBA04	AC Dipole Based Optics Measurement and Correction at RHIC	526
	X. Shen, S.-Y. Lee IUCEEM, Bloomington, Indiana, USA M. Bai, Y. Luo, A. Marusic, G. Robert-Demolaize, S.M. White BNL, Upton, Long Island, New York, USA R. Tomás CERN, Geneva, Switzerland
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Independent component analysis (ICA) was applied to the AC dipole based optics measurement at RHIC to extract beta functions as well as phase advances at each BPM. Existence of excessive beta-beat was observed in both rings of RHIC at store energy. A unique global optics correction scheme was then developed and tested successfully during the RHIC polarized proton run in 2013. The feasibility of using closed orbit bump and sextupole for arc beta-beat correction was also demonstrated. The technique and experimental results of optics correction are reported in this paper.

TUPBA25	Design and High Order Optimization of the ATF2 Lattices	574
	E. Marín, G.R. White, M. Woodley SLAC, Menlo Park, California, USA K. Kubo, T. Okugi, T. Tauchi, J. Urakawa KEK, Ibaraki, Japan R. Tomás CERN, Geneva, Switzerland
	Funding: Work supported in part by Department of Energy Contract DE-AC02-76SF00515 The next generation of future linear colliders (LC) demands nano-meter beam sizes at the interaction point (IP) in order to reach the required luminosity. The final focus system (FFS) of a LC is meant to deliver such small beam sizes. The Accelerator Test Facility (ATF) aims to test the feasibility of the new local chromaticity correction scheme which the future LCs are based on. To this end the ATF2 nominal and ultra-low β^* lattices are design to vertically focus the beam at the IP to 37nm and 23nm, respectively if error-free lattices are considered. However simulations show that the measured field errors of the ATF2 magnets preclude to reach the mentioned spot sizes. This paper describes the optimization of high order aberrations of the ATF2 lattices in order to minimize the detrimental effect of the measured multipole components for both ATF2 lattices. Specifically three solutions are studied, the replacement of the last focusing quadrupole (QF1FF), insertion of octupole magnets and optics modification. By applying the mentioned cures the design vertical beam size at the IP is almost recovered for both ATF2 lattices.

Paper

Title

Page

AC Dipole Based Optics Measurement and Correction at RHIC

526

X. Shen, S.-Y. Lee
IUCEEM, Bloomington, Indiana, USA
M. Bai, Y. Luo, A. Marusic, G. Robert-Demolaize, S.M. White
BNL, Upton, Long Island, New York, USA
R. Tomás
CERN, Geneva, Switzerland

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Independent component analysis (ICA) was applied to the AC dipole based optics measurement at RHIC to extract beta functions as well as phase advances at each BPM. Existence of excessive beta-beat was observed in both rings of RHIC at store energy. A unique global optics correction scheme was then developed and tested successfully during the RHIC polarized proton run in 2013. The feasibility of using closed orbit bump and sextupole for arc beta-beat correction was also demonstrated. The technique and experimental results of optics correction are reported in this paper.

TUPBA25

Design and High Order Optimization of the ATF2 Lattices

574

E. Marín, G.R. White, M. Woodley
SLAC, Menlo Park, California, USA
K. Kubo, T. Okugi, T. Tauchi, J. Urakawa
KEK, Ibaraki, Japan
R. Tomás
CERN, Geneva, Switzerland

Funding: Work supported in part by Department of Energy Contract DE-AC02-76SF00515
The next generation of future linear colliders (LC) demands nano-meter beam sizes at the interaction point (IP) in order to reach the required luminosity. The final focus system (FFS) of a LC is meant to deliver such small beam sizes. The Accelerator Test Facility (ATF) aims to test the feasibility of the new local chromaticity correction scheme which the future LCs are based on. To this end the ATF2 nominal and ultra-low β^* lattices are design to vertically focus the beam at the IP to 37nm and 23nm, respectively if error-free lattices are considered. However simulations show that the measured field errors of the ATF2 magnets preclude to reach the mentioned spot sizes. This paper describes the optimization of high order aberrations of the ATF2 lattices in order to minimize the detrimental effect of the measured multipole components for both ATF2 lattices. Specifically three solutions are studied, the replacement of the last focusing quadrupole (QF1FF), insertion of octupole magnets and optics modification. By applying the mentioned cures the design vertical beam size at the IP is almost recovered for both ATF2 lattices.