IPAC2015 - List of Authors (Aiba, M.)

Paper	Title	Page
MOPJE074	Optimizing SLS-2 Nonlinearities Using a Multi-Objective Genetic Optimizer	486
	M.P. Ehrlichman, M. Aiba, A. Streun PSI, Villigen PSI, Switzerland
	An upgrade to the SLS is currently under development. This upgrade will likely utilize the same hall and same machine circumference, 288 m, of the SLS. Achieving a sufficiently low emittance with such a small circumference requires tight focusing and low dispersion. These conditions make chromaticity correction difficult and minimization of 1st and 2nd order non-linear driving terms does not yield sufficient dynamic aperture and Touschek lifetime. In this proceeding, we discuss the multi-objective genetic optimization method being implemented at SLS to aid the design of a chromaticity correction scheme for SLS2.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE074
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TUPJE044	Local Orbit Response Matrix Measurement at SLS	1713
	M. Aiba, M. Böge PSI, Villigen PSI, Switzerland
	The experimental determination of linear optics is essential to achieve a high performance ring accelerator. One of the methods, linear optics from closed orbits (LOCO), is widely employed to correct linear optics. Due to the ring nature, a quadrupole error at a location of the ring affects the entire orbit response measurement data. The orbit response, however, can be localised to a certain range of the ring when an orbit feedback (or correction) is applied to the rest of the ring. The quadrupole errors located in the range, where the feedback is acting, then have no impact, and the ring optics can be locally examined. An application of this technique to Swiss light source is discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE044
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TUPJE045	Round Beam Operation in Electron Storage Rings and generalisation of Mobius accelerator	1716
	M. Aiba, M.P. Ehrlichman, A. Streun PSI, Villigen PSI, Switzerland
	A better performing photon beam can be obtained from light sources when the eletron beam is formed into a "round beam" rather than a flat beam. It is realised by equally distributing the natural emittance into the horizontal and vertical planes. There are a few approaches for the emittance distribution, and we explored the so-called Mobius accelerator scheme, where a transverse (horizontal-vertical) emittance exchange results at each turn of beam revolution. The original proposal of Mobius accelerator was based on a set of five succesive skew quadruples, requiring a dedicated long straight section. We generalise the Mobius accelerator section to find more convenient configurations. Applications to a light source storage ring lattice and some tracking results are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE045
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TUPJE046	Investigation of the Injection Scheme for SLS 2.0	1720
	Á. Saá Hernández, M. Aiba PSI, Villigen PSI, Switzerland
	SLS2, an upgrade of the Swiss Light Source (SLS), aiming at a natural horizontal emittance in the range of 100 pm is planned and under study. This will be achieved by replacing the current magnet lattice of the electron storage ring by a new multibend achromat magnet lattice, while reusing the injector chain and most of the existing infrastructures. The new low emittance ring will impose more restrictive constraints on injection due to a smaller machine aperture and a very compact lattice, dominated by non-linearities. We performed a study to find the optimum injection scheme for SLS2 among the conventional and more advanced schemes; namely multipole kicker injection (off-axis and also on-axis matched to the off-momentum closed orbit) and longitudinal injection.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE046
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TUPJE047	Design Studies for an Upgrade of the SLS Storage Ring	1724
	A. Streun, M. Aiba, M. Böge, M.P. Ehrlichman, Á. Saá Hernández PSI, Villigen PSI, Switzerland
	An upgrade of the Swiss Light Source (SLS) would replace the existing storage ring by a low aperture multibend achromat lattice providing an emittance of about 100–200 pm at 2.4 GeV, while maintaining the hall, the beam lines and the injector. Since emittance scales inversely cubically with the number of lattice cells, an SLS upgrade is challenged by the comparatively small ring circumference of only 288 m. A new concept for a compact low emittance lattice is based on longitudinal gradient bending magnets for emittance minimization and on anti-bends (i.e bends of opposite field polarity) to disentangle dispersion and horizontal beta function in order to provide the optimum matching to the longitudinal gradient bends while minimizing the contribution to chromaticity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE047
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TUPJE048	Orbit Correction and Stability Studies for Ultra-Low Emittance Storage Rings	1728
	M. Böge, M. Aiba, A. Streun PSI, Villigen PSI, Switzerland
	Ultra-low emittance storage rings exhibit extremely strong focusing and sextupolar chromaticity corrections. The therefore mandatory excellent centering of the closed orbit in the small aperture magnets is a challenging task and necessitates a proper beam diagnostics and correction layout. Correction and stability studies for a possible ultra-low emittance upgrade of the Swiss Light Source are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE048
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Paper

Title

Page

Optimizing SLS-2 Nonlinearities Using a Multi-Objective Genetic Optimizer

486

M.P. Ehrlichman, M. Aiba, A. Streun
PSI, Villigen PSI, Switzerland

An upgrade to the SLS is currently under development. This upgrade will likely utilize the same hall and same machine circumference, 288 m, of the SLS. Achieving a sufficiently low emittance with such a small circumference requires tight focusing and low dispersion. These conditions make chromaticity correction difficult and minimization of 1st and 2nd order non-linear driving terms does not yield sufficient dynamic aperture and Touschek lifetime. In this proceeding, we discuss the multi-objective genetic optimization method being implemented at SLS to aid the design of a chromaticity correction scheme for SLS2.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE074

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE044

Local Orbit Response Matrix Measurement at SLS

1713

M. Aiba, M. Böge
PSI, Villigen PSI, Switzerland

The experimental determination of linear optics is essential to achieve a high performance ring accelerator. One of the methods, linear optics from closed orbits (LOCO), is widely employed to correct linear optics. Due to the ring nature, a quadrupole error at a location of the ring affects the entire orbit response measurement data. The orbit response, however, can be localised to a certain range of the ring when an orbit feedback (or correction) is applied to the rest of the ring. The quadrupole errors located in the range, where the feedback is acting, then have no impact, and the ring optics can be locally examined. An application of this technique to Swiss light source is discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE044

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE045

Round Beam Operation in Electron Storage Rings and generalisation of Mobius accelerator

1716

M. Aiba, M.P. Ehrlichman, A. Streun
PSI, Villigen PSI, Switzerland

A better performing photon beam can be obtained from light sources when the eletron beam is formed into a "round beam" rather than a flat beam. It is realised by equally distributing the natural emittance into the horizontal and vertical planes. There are a few approaches for the emittance distribution, and we explored the so-called Mobius accelerator scheme, where a transverse (horizontal-vertical) emittance exchange results at each turn of beam revolution. The original proposal of Mobius accelerator was based on a set of five succesive skew quadruples, requiring a dedicated long straight section. We generalise the Mobius accelerator section to find more convenient configurations. Applications to a light source storage ring lattice and some tracking results are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE045

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE046

Investigation of the Injection Scheme for SLS 2.0

1720

Á. Saá Hernández, M. Aiba
PSI, Villigen PSI, Switzerland

SLS2, an upgrade of the Swiss Light Source (SLS), aiming at a natural horizontal emittance in the range of 100 pm is planned and under study. This will be achieved by replacing the current magnet lattice of the electron storage ring by a new multibend achromat magnet lattice, while reusing the injector chain and most of the existing infrastructures. The new low emittance ring will impose more restrictive constraints on injection due to a smaller machine aperture and a very compact lattice, dominated by non-linearities. We performed a study to find the optimum injection scheme for SLS2 among the conventional and more advanced schemes; namely multipole kicker injection (off-axis and also on-axis matched to the off-momentum closed orbit) and longitudinal injection.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE046

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE047

Design Studies for an Upgrade of the SLS Storage Ring

1724

A. Streun, M. Aiba, M. Böge, M.P. Ehrlichman, Á. Saá Hernández
PSI, Villigen PSI, Switzerland

An upgrade of the Swiss Light Source (SLS) would replace the existing storage ring by a low aperture multibend achromat lattice providing an emittance of about 100–200 pm at 2.4 GeV, while maintaining the hall, the beam lines and the injector. Since emittance scales inversely cubically with the number of lattice cells, an SLS upgrade is challenged by the comparatively small ring circumference of only 288 m. A new concept for a compact low emittance lattice is based on longitudinal gradient bending magnets for emittance minimization and on anti-bends (i.e bends of opposite field polarity) to disentangle dispersion and horizontal beta function in order to provide the optimum matching to the longitudinal gradient bends while minimizing the contribution to chromaticity.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE047

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPJE048

Orbit Correction and Stability Studies for Ultra-Low Emittance Storage Rings

1728

M. Böge, M. Aiba, A. Streun
PSI, Villigen PSI, Switzerland

Ultra-low emittance storage rings exhibit extremely strong focusing and sextupolar chromaticity corrections. The therefore mandatory excellent centering of the closed orbit in the small aperture magnets is a challenging task and necessitates a proper beam diagnostics and correction layout. Correction and stability studies for a possible ultra-low emittance upgrade of the Swiss Light Source are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)