The Fermilab Tevatron

Teng, L. C.

doi:10.2172/1156136

Cited by 14 publications

(25 citation statements)

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“…Based upon the TME theory [7,8], we recently developed a different approach to search for small-emittance and low-beta lattices. Instead of the quadrupole strengths, the starting point of this method is the lattice properties; once optimal lattice properties are found, the quadrupole strengths are determined by lattice matching.…”

Section: Small-emittance and Low-beta Lattice Design A Optimizamentioning

confidence: 99%

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Small-emittance and low-beta lattice designs and optimizations

Sun

Robin

Nishimura

et al. 2012

Phys. Rev. ST Accel. Beams

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This paper uses the advanced light source (ALS) storage-ring lattice as an example to illustrate the strategies and techniques that we developed for lattice design and optimization. First, the theoretical minimum emittance (TME) theory is applied to optimize the ALS storage-ring lattice for its future upgrades. The study confirms the results found in earlier study using both global scan of all stable settings and multiobjective genetic algorithms (MOGA) techniques. It is shown that, using TME, the ALS natural emittance can be reduced to an even smaller value by introducing additional quadrupoles to the straight, which is unknown in previous studies. Then, the nonlinear properties of the lattice are optimized using MOGA. Instead of the conventionally used dynamic aperture area, the total diffusion rate of the lattice is used as an objective in the optimization, which leads to a superior performance in nonlinear beam dynamics. Finally, to find a best overall working lattice for ALS future upgrades, the linear and nonlinear properties of the lattice are optimized simultaneously using MOGA. Compared to the widely used dynamic aperture tune scan technique, MOGA not only allows us to rapidly find a best working point in a wide searching range, but also provides us trade-offs among the optimization objectives, such as the low emittance, small beta function, and large dynamic aperture. These trade-offs give us a guideline to choose a candidate lattice for ALS future upgrades. The strategies and techniques presented in this paper are not limited to the ALS, and can be adopted to other facilities.

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Section: Small-emittance and Low-beta Lattice Design A Optimizamentioning

confidence: 99%

“…In Sec. III, we apply the theoretical minimum emittance (TME) theory [7,8] to search for small-emittance and low-beta lattices. The study confirms the results found in earlier study using both global scan of all stable settings (GLASS) [9] and multiobjective genetic algorithms (MOGA) [10] techniques.…”

Section: Introductionmentioning

confidence: 99%

Small-emittance and low-beta lattice designs and optimizations

Sun

Robin

Nishimura

et al. 2012

Phys. Rev. ST Accel. Beams

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“…• Theoretical minimum emittance [2] (TME) cells to achieve the very low emittance • Double bend achromat [3] (DBA) cells to provide spaces for IDs and to retain emittance • 90-meter damping wigglers to further reduce the emittance and damping time…”

Section: Gev (Not Including the Effect Of Intra-beam Scattering)mentioning

confidence: 99%

Lattice and Collective Effects for PEP-X

Bane¹,

Cai²,

Chao³

et al. 2008

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This is a more comprehensive report of the accelerator physics in the white paper "PEP-X Light Source at SLAC". A new light source called "PEP-X" would reside in the 2.2-km PEP-II tunnel. It has a hybrid lattice where two of its six arcs contain DBA cells that provide a total of 30 straight sections for insertion device beam lines and the remaining arcs contain TME cells for an extremely low emittance. Using 90 meter damping wigglers the horizontal emittance at 4.5 GeV is further reduced to 0.1 nm-rad. Many collective effects including intra-beam scattering, Touschek lifetime, and fast ion instability are studied. We expect that PEP-X will produce photon beams having brightnesses near 10 22 (ph/s/mm 2 /mrad 2 /0.1% BW) at 10 keV and 10 21 at 35 keV.

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“…To attain an ultralow emittance with a compact layout, it is common [8] to use combined-function dipoles and strong quadrupoles to achieve small optical parameters that are close to the theoretical minimum emittance (TME [9]) conditions in the dipoles. In some standard-MBA designs [e.g., 10, 11] the emittance is further reduced with damping wigglers.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the lattice design of a diffraction-limited storage ring with a rational combination of particle swarm and genetic algorithms

Jiao

2017

Chinese Phys. C

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Abstract:In the design of a diffraction-limited storage ring (DLSR) consisting of compact multi-bend achromats (MBAs), it is challenging to simultaneously achieve an ultralow emittance and a satisfactory nonlinear performance, due to extremely large nonlinearities and limited tuning ranges of the element parameters. Nevertheless, taking the High Energy Photon Source (HEPS) as an example, we demonstrate that the potential of a DLSR design can be explored with a successive and iterative implementation of the particle swarm optimization (PSO) and multi-objective genetic algorithm (MOGA). It turns out that with a hybrid MBA lattice, it is feasible for the HEPS to attain a natural emittance of about 50 pm.rad, and meanwhile, realize a sufficient ring acceptance for beam accumulation with an on-axis longitudinal injection scheme. Particularly, this study indicates that a rational combination of the PSO and MOGA is more effective than either of them alone in approaching the true global optima, for an explorative multi-objective problem with many optimizing variables and local optima.

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The Fermilab Tevatron

Cited by 14 publications

References 0 publications

Small-emittance and low-beta lattice designs and optimizations

Small-emittance and low-beta lattice designs and optimizations

Lattice and Collective Effects for PEP-X

Optimizing the lattice design of a diffraction-limited storage ring with a rational combination of particle swarm and genetic algorithms

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