| Paper | Title | Page |
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| MOP050 | EPIC Muon Cooling Simulations using COSY INFINITY | 190 |
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| Next generation magnet systems needed for cooling channels in both neutrino factories and muon colliders will be innovative and complicated. Designing, simulating and optimizing these systems is a challenge. Using COSY INFINITY, a differential algebra-based code, to simulate complicated elements can allow the computation and correction of a variety of higher order effects, such as spherical and chromatic aberrations, that are difficult to address with other simulation tools. As an example, a helical dipole magnet has been implemented and simulated, and the performance of an epicyclic parametric ionization cooling system for muons is studied and compared to simulations made using G4Beamline, a GEANT4 toolkit. | ||
| WEP074 | Correcting Aberrations in Complex Magnet Systems for Muon Cooling Channels | 1615 |
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Funding: Supported in part by DOE SBIR grant DE-SC0005589 Designing and simulating complex magnet systems needed for cooling channels in both neutrino factories and muon colliders requires innovative techniques to correct for both chromatic and spherical aberrations. Optimizing complex systems, such as helical magnets for example, is also difficult but essential. By using COSY INFINITY, a differential algebra based code, the transfer and aberration maps can be examined to discover what critical terms have the greatest influence on these aberrations. |
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| WEP157 | An Implementation of the Fast Multipole Method for High Accuracy Particle Tracking of Intense Beams | 1782 |
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| We implement a single level version of the fast multipole method in the software package COSY Infinity. This algorithm has been used in other physics fields to determine high accuracy electrostatic potentials, and is implemented here for charged particle beams. The method scales like NlogN with the particle number and has a priori error estimates, which can be reduced to essentially machine precision if multipole expansions of high enough order are employed, resulting in a highly accurate algorithm for simulation of intense beams without averaging such as encountered in PIC methods. In order to further speed up the algorithm we use COSY Infinity’s innate differential algebraic methods to help with the expansions inherent in this system. Differential algebras allow for fast and exact numerical differentiation of functions that carries through any mathematical transformations performed, and can be used to quickly create the expansions used in the fast multipole method. This can then be combined with moment method techniques to extract transfer maps which include space charge within distributions that are difficult to approximate. | ||
| WEP206 | An Accumulator/Pre-Booster for the Medium-Energy Electron Ion Collider at JLab | 1873 |
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| Future nuclear physics facilities such as the proposed electron ion collider (MEIC) will need to achieve record high luminosities in order to maximize discovery potential. Among the necessary ingredients is the ability to generate, accumulate, accelerate, and store high current ion beams from protons to lead ions. One of the main components of this ion accelerator complex for MEIC chain is the accumulator that also doubles as a pre-booster, which takes 200 MeV protons from a superconducting linear accelerator, accumulates on the order of 1A beam, and boosts its energy to 3GeV, before extraction to the next accelerator in the chain, the large booster. This paper describes its design concepts, and summarizes some preliminary results, including linear optics, space charge dynamics, and spin polarization resonance analysis. | ||
| WEP251 | Design Studies of Pre-Boosters of Different Circumference for an Electron Ion Collider at JLab | 1954 |
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| The Medium-Energy Electron Ion Collider (MEIC) at JLab comprises a figure-8 shaped pre–booster ring as one of the main components. As it performs for both the accumulation of protons and ions it must have a circumference long enough to accommodate components such as RF cavities, cooling devices, collimation, injection and extraction. The length of the large booster ring in MEIC is suggested to be in the range 1.0-1.2km. Based on preliminary design work, the minimum viable length of the pre-booster in MEIC was identified as 200m. It is clear that the integer multiple of the length of the designed pre-booster should match with that of the large booster in MEIC. In order to cater future requirements of the EIC, the pre-booster in MEIC needs to be designed in different versions featured by different lengths. Thus, three different pre-boosters of lengths 200m, 250m and 300m are designed with various cell structures. This paper summarizes the three variants of the lattice. | ||
| THP093 | Design Status of MEIC at JLab | 2306 |
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Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. An electron-ion collider (MEIC) is envisioned as the primary future of the JLab nuclear science program beyond the 12 GeV upgraded CEBAF. The present MEIC design selects a ring-ring collider option and covers a CM energy range up to 51 GeV for both polarized light ions and un-polarized heavy ions, while higher CM energies could be reached by a future upgrade. The MEIC stored colliding ion beams, which will be generated, accumulated and accelerated in a green field ion complex, are designed to match the stored electron beam injected at full energy from the CEBAF in terms of emittance, bunch length, charge and repetition frequency. This design strategy ensures a high luminosity above 1034 s−1cm-2. A unique figure-8 shape collider ring is adopted for advantages of preserving ion polarization during acceleration and accommodation of a polarized deuteron beam for collisions. Our recent effort has been focused on completing this conceptual design as well as design optimization of major components. Significant progress has also been made in accelerator R&D including chromatic correction and dynamical aperture, beam-beam, high energy electron cooling and polarization tracking. |
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