Polarized beam dynamics in a Recirculated Linear Accelerator (RLA) differ markedly from their beh... more Polarized beam dynamics in a Recirculated Linear Accelerator (RLA) differ markedly from their behavior in circular machines. After giving a brief overview of the topology of a RLA we discuss the unique requirements for polarized beam physics experiments carried at these types of machines and their implications on the spin transport. The Thomas BMT equation will be rewritten to emphasize the relevant features and the relationship between spin transport and global accelerator parameters such as the accelerating profiles. We will consider scenarios for which one or more experimental hall has to be provided with longitudinal polarization and discuss how this is achieved. Finally, a review of possible depolarization and spin precession effects occurring in these machines will be presented. In order to illustrate this, we will examine the case of the Stanford Linear Collider (SLC) where such effects were first observed. 8.1 Topology of a Recirculated Linear Accelerator Recirculated super conducting linear accelerators are used when high duty factor continuous beams for nuclear physics experiments are desired. Many such experiments require polarized electron sources yielding up to 90% of longitudinally or transversally polarized beams.
Polarized Beam Dynamics and Instrumentation in Particle Accelerators
The degree of polarization of the beams must be precisely measured, both to enable development an... more The degree of polarization of the beams must be precisely measured, both to enable development and optimization of the beams, and to normalize the spin dependent effects observed in experiments. Ion beam polarimetry is particularly challenging since the physics processes available for polarimetry are themselves the subject of active physics research. This chapter describes ion polarimetry as implemented at the Relativistic Heavy Ion Collider (RHIC), the only high energy polarized proton collider.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1995
Computing techniques based on parallel processing have been used to treat the information from th... more Computing techniques based on parallel processing have been used to treat the information from the electromagnetic calorimeters in SLAC experiments E142/E143. Cluster finding and separation of overlapping showers are performed by a cellular automaton, pion and electron identification is done by using a multilayered neural network. Both applications are presented and their resulting performances are shown to be improved compared to more standard approaches.
A multi-pass recirculating superconducting CW linac offers a cost effective path to a multi-user ... more A multi-pass recirculating superconducting CW linac offers a cost effective path to a multi-user facility with unprecedented scientific and industrial reach over a wide range of disciplines. We propose such a facility as an option for a potential UK-XFEL. Energy Recovery enables multi-MHz FEL sources, for example, an X-ray FEL oscillator or regenerative amplifier FEL. Additionally, combining with external lasers and/or self-interaction would provide access to MeV and GeV gamma-rays via inverse Compton scattering at high average power for nuclear and particle physics applications. An opportunity exists to demonstrate the necessary point-to-parallel longitudinal matches to drive an XFEL and successfully energy recover at the upcoming 5-pass up, 5-pass down Energy Recovery experiment on CEBAF at JLab termed ER@CEBAF. We show candidate matches and simulations supporting the minimal necessary modifications to CEBAF this will require. This includes linearisation of the longitudinal phase ...
The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory is a high power... more The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory is a high power Continuous Wave (CW) electron accelerator. It uses a mixture of of SRF cryomodules: older, lower energy C20/C50 modules and newer, higher energy C100 modules. The cryomodules are arrayed in two anti-parallel linear accelerators. Accurately classifying the type of cavity faults is essential to maintaining and improving accelerator performance. Each C100 cryomodule contains eight 7-cell cavities. When a cavity fault occurs within a cryomodule, all eight cavities generate 17 waveforms each containing 8192 points. This data is exported from the control system and saved for review. Analysis of these waveforms is time intensive and requires a subject matter expert (SME). SMEs examine the data from each event and label it according to one of several known cavity fault types. Multiple machine learning models have been developed on this labeled dataset with sufficient performance to warrant the ...
We use results by Di Mitri et al. [1] as the basis of a method for suppression of synchrotron-rad... more We use results by Di Mitri et al. [1] as the basis of a method for suppression of synchrotron-radiation-driven beam quality degradation during recirculation. Use of second-order achromatic superperiodic recirculation transport based on individually isochronous and achromatic superperiods of low-quantum-excitation lattices is found to provide control of both emittance degradation from coherent synchrotron radiation (CSR) and microbunching instability (BI) gain. Use of such low excitation lattices and choice of sufficiently large bend radius also insures incoherent synchrotron radiation (ISR) driven effects are well-managed. METHODS FOR CSR/ISR CONTROL Di Mitri et al. have derived conditions under which CSR-induced emittance growth can be suppressed during transport through bending systems [1]. We apply these conditions using a simple methodology to generate a design for a recirculation transport line giving little emittance growth even at high bunch charges, and exhibiting low micro...
The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is the first large hig... more The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is the first large high power CW recirculating electron accelerator which makes use of SRF accelerating structures configured in two antiparallel linacs. Each linac consists of twenty C20/C50 cryomodules each containing eight 5-cell cavities and five C100 upgrade cryomodules each containing eight 7-cell cavities. Accurately classifying the source of cavity faults is critical for improving accelerator performance. In addition to archived signals sampled at 10 Hz, a cavity fault triggers a waveform acquisition process where 16 waveform records sampled at 5 kHz are recorded for each of the 8 cavities in the effected cryomodule. The waveform record length is sufficiently long for transient microphonic effects to be observable. Significant time is required by a subject matter expert to analyze and identify the intra-cavity signatures of imminent faults. This paper describes a path forward that utilizes machine lea...
A proposal was formulated to increase the CEBAF energy from the present 12 GeV to 20-24 GeV by re... more A proposal was formulated to increase the CEBAF energy from the present 12 GeV to 20-24 GeV by replacing the highest-energy arcs with Fixed Field Alternating Gradient (FFA) arcs. The new pair of arcs would provide six or seven new beam passes, going through this magnet array, allowing the energy to be nearly doubled using the existing CEBAF SRF cavity system. One of the immediate accelerator design tasks is to develop a proof-of-principle FFA arc magnet lattice that would support simultaneous transport of 6-7 passes with energies spanning a factor of two. We also examine the possibility of using combined function magnets to configure a cascade, six-way beam split switchyard. Finally, a novel multi-pass linac optics based on a weakly focusing lattice is being explored.
The electron and ion beams of a future Electron Ion Collider (EIC) must collide at an angle for d... more The electron and ion beams of a future Electron Ion Collider (EIC) must collide at an angle for detection, machine and engineering design reasons. To avoid associated luminosity reduction, a local crabbing scheme is used where each beam is crabbed before collision and de-crabbed after collision. The crab crossing scheme then provides a head-on collision for beams with a non-zero crossing angle. We develop a framework for accurate simulation of crabbing dynamics with beam-beam effects by combining symplectic particle tracking codes with a beam-beam model based on the Bassetti-Erskine analytic solution. We present simulation results using our implementation of such a framework where the beam dynamics around the ring is tracked using Elegant and the beam-beam kick is modeled in Python.
Beam synchronization of the future electron-ion collider (EIC) is studied with introducing differ... more Beam synchronization of the future electron-ion collider (EIC) is studied with introducing different bunch numbers in the two colliding beams. This allows non-pairwise collisions between the bunches of the two beams and is known as "gear-change", whereby one bunch of the first beam collides with all other bunches of the second beam, one at a time. Here we report on the study of how the beam dynamics of the Jefferson Lab Electron Ion collider concept is affected by the gear change. For this study, we use the new GPU-based code (GHOST). It features symplectic one-turn maps for particle tracking and Bassetti-Erskine approach for beam-beam interactions.
The JLab Simulation Package on Electron Cooling (JSPEC) is an open source software developed at J... more The JLab Simulation Package on Electron Cooling (JSPEC) is an open source software developed at Jefferson Lab for electron cooling and intrabeam scattering (IBS) simulations. IBS is an important factor that leads to the growth of the beam emittance and hence the reduction of the luminosity in a high density ion collider ring. Electron cooling is an effective measure to overcome the IBS effect. Although JSPEC is initiated to fulfill the simulation needs in JLab Electron Ion Collider project, it can be used as a general design tool for other accelerators. JSPEC provides various models of the ion beam and the electron beam and it calculates the expansion rate and simulates the evolution of the ion beam under the IBS and/or electron cooling effect. In this report, we will give a brief introduction of JSPEC and then present the latest code development progress of JSPEC, including new models, algorithms, and the user interface.
This report is an outcome of the workshop AI for Nuclear Physics held at Thomas Jefferson Nationa... more This report is an outcome of the workshop AI for Nuclear Physics held at Thomas Jefferson National Accelerator Facility on March 4–6, 2020
Futuremachines such as the Electron Ion Collider (MEIC), linac-ring machines (eRHIC) or LHeC are ... more Futuremachines such as the Electron Ion Collider (MEIC), linac-ring machines (eRHIC) or LHeC are particularly sensitive to beam-beam effects. This is the limiting factor for long-term stability and high luminosity reach. The complexity of the non-linear dynamics makes it challenging to perform such simulations typically requiring millions of turns. Until recently, most of the methods have involved using linear approximations and/or tracking for a limited number of turns. We have developed a framework which exploits a massively parallel Graphical Processing Units (GPU) architecture to allow for tracking millions of turns in a sympletic way up to an arbitrary order. The code is called GHOST for GPU-accelerated High-Order Symplectic Tracking. Our approach relies on a matrix-based arbitrary-order symplectic particle tracking for beam transport and the Bassetti-Erskine approximation for the beam-beam interaction. INTRODUCTION AND BACKGROUND The proper magnetic optics design and performan...
Future machines such as the electron-ion colliders (JLEIC), linac-ring machines (eRHIC) or LHeC a... more Future machines such as the electron-ion colliders (JLEIC), linac-ring machines (eRHIC) or LHeC are particularly sensitive to beam-beam effects. This is the limiting factor for long-term stability and high luminosity reach. The complexity of the non-linear dynamics makes it challenging to perform such simulations which require millions of turns. Until recently, most of the methods used linear approximations and/or tracking for a limited number of turns. We have developed a framework which exploits a massively parallel Graphical Processing Units (GPU) architecture to allow for tracking millions of turns in a symplectic way up to an arbitrary order and colliding them at each turn. The code is called GHOST for GPU-accelerated High-Order Symplectic Tracking. As of now, there is no other code in existence that can accurately model the single-particle non-linear dynamics and the beam-beam effect at the same time for a large enough number of turns required to verify the long-term stability...
The Continuous Electron Beam Accelerator Facility at Jefferson Lab has 200 RF cavities in the nor... more The Continuous Electron Beam Accelerator Facility at Jefferson Lab has 200 RF cavities in the north linac and the south linac respectively after the 12 GeV upgrade. The purpose of this work is to simultaneously optimize the heat load and the trip rates for the cavities and to reconstruct the Pareto-optimal front in a timely manner when some of the cavities are turned off. By choosing an efficient optimizer and strategically creating the initial gradients, the Paretooptimal front for up to 15 cavities turned off can be established in about 20 seconds.
Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosi... more Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosity at a 45 GeV center-of-mass energy. This luminosity relies on ion cooling in both the booster and the storage ring of the accelerator complex. The cooling in the booster will use a conventional DC cooler similar to the one at COSY. The high-energy storage ring, operating at a momentum of up to 100 GeV/nucleon, requires novel use of bunchedbeam cooling. There are two designs for such a cooler. The first uses a conventional Energy Recovery Linac (ERL) with a magnetized beam while the second uses a circulating ring to enhance both peak and average currents experienced by the ion beam. This presentation will describe the design of both the Circulator Cooling Ring (CCR) design and that of the backup option using the stand-alone ERL operated at lower charge but higher repetition rate than the ERL injector required by the CCRbased design.
We present an update on the development of the new code for long-term simulation of beam-beameffe... more We present an update on the development of the new code for long-term simulation of beam-beameffects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order particle tracking (including a symplectic option) for beam transport and the generalized Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel implementation on a hybrid GPU/CPU platform. With the new code, previouslycomputationallyprohibitivelongterm simulations become tractable. The new code will be used to model the proposed Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab.
Polarized beam dynamics in a Recirculated Linear Accelerator (RLA) differ markedly from their beh... more Polarized beam dynamics in a Recirculated Linear Accelerator (RLA) differ markedly from their behavior in circular machines. After giving a brief overview of the topology of a RLA we discuss the unique requirements for polarized beam physics experiments carried at these types of machines and their implications on the spin transport. The Thomas BMT equation will be rewritten to emphasize the relevant features and the relationship between spin transport and global accelerator parameters such as the accelerating profiles. We will consider scenarios for which one or more experimental hall has to be provided with longitudinal polarization and discuss how this is achieved. Finally, a review of possible depolarization and spin precession effects occurring in these machines will be presented. In order to illustrate this, we will examine the case of the Stanford Linear Collider (SLC) where such effects were first observed. 8.1 Topology of a Recirculated Linear Accelerator Recirculated super conducting linear accelerators are used when high duty factor continuous beams for nuclear physics experiments are desired. Many such experiments require polarized electron sources yielding up to 90% of longitudinally or transversally polarized beams.
Polarized Beam Dynamics and Instrumentation in Particle Accelerators
The degree of polarization of the beams must be precisely measured, both to enable development an... more The degree of polarization of the beams must be precisely measured, both to enable development and optimization of the beams, and to normalize the spin dependent effects observed in experiments. Ion beam polarimetry is particularly challenging since the physics processes available for polarimetry are themselves the subject of active physics research. This chapter describes ion polarimetry as implemented at the Relativistic Heavy Ion Collider (RHIC), the only high energy polarized proton collider.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1995
Computing techniques based on parallel processing have been used to treat the information from th... more Computing techniques based on parallel processing have been used to treat the information from the electromagnetic calorimeters in SLAC experiments E142/E143. Cluster finding and separation of overlapping showers are performed by a cellular automaton, pion and electron identification is done by using a multilayered neural network. Both applications are presented and their resulting performances are shown to be improved compared to more standard approaches.
A multi-pass recirculating superconducting CW linac offers a cost effective path to a multi-user ... more A multi-pass recirculating superconducting CW linac offers a cost effective path to a multi-user facility with unprecedented scientific and industrial reach over a wide range of disciplines. We propose such a facility as an option for a potential UK-XFEL. Energy Recovery enables multi-MHz FEL sources, for example, an X-ray FEL oscillator or regenerative amplifier FEL. Additionally, combining with external lasers and/or self-interaction would provide access to MeV and GeV gamma-rays via inverse Compton scattering at high average power for nuclear and particle physics applications. An opportunity exists to demonstrate the necessary point-to-parallel longitudinal matches to drive an XFEL and successfully energy recover at the upcoming 5-pass up, 5-pass down Energy Recovery experiment on CEBAF at JLab termed ER@CEBAF. We show candidate matches and simulations supporting the minimal necessary modifications to CEBAF this will require. This includes linearisation of the longitudinal phase ...
The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory is a high power... more The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory is a high power Continuous Wave (CW) electron accelerator. It uses a mixture of of SRF cryomodules: older, lower energy C20/C50 modules and newer, higher energy C100 modules. The cryomodules are arrayed in two anti-parallel linear accelerators. Accurately classifying the type of cavity faults is essential to maintaining and improving accelerator performance. Each C100 cryomodule contains eight 7-cell cavities. When a cavity fault occurs within a cryomodule, all eight cavities generate 17 waveforms each containing 8192 points. This data is exported from the control system and saved for review. Analysis of these waveforms is time intensive and requires a subject matter expert (SME). SMEs examine the data from each event and label it according to one of several known cavity fault types. Multiple machine learning models have been developed on this labeled dataset with sufficient performance to warrant the ...
We use results by Di Mitri et al. [1] as the basis of a method for suppression of synchrotron-rad... more We use results by Di Mitri et al. [1] as the basis of a method for suppression of synchrotron-radiation-driven beam quality degradation during recirculation. Use of second-order achromatic superperiodic recirculation transport based on individually isochronous and achromatic superperiods of low-quantum-excitation lattices is found to provide control of both emittance degradation from coherent synchrotron radiation (CSR) and microbunching instability (BI) gain. Use of such low excitation lattices and choice of sufficiently large bend radius also insures incoherent synchrotron radiation (ISR) driven effects are well-managed. METHODS FOR CSR/ISR CONTROL Di Mitri et al. have derived conditions under which CSR-induced emittance growth can be suppressed during transport through bending systems [1]. We apply these conditions using a simple methodology to generate a design for a recirculation transport line giving little emittance growth even at high bunch charges, and exhibiting low micro...
The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is the first large hig... more The Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is the first large high power CW recirculating electron accelerator which makes use of SRF accelerating structures configured in two antiparallel linacs. Each linac consists of twenty C20/C50 cryomodules each containing eight 5-cell cavities and five C100 upgrade cryomodules each containing eight 7-cell cavities. Accurately classifying the source of cavity faults is critical for improving accelerator performance. In addition to archived signals sampled at 10 Hz, a cavity fault triggers a waveform acquisition process where 16 waveform records sampled at 5 kHz are recorded for each of the 8 cavities in the effected cryomodule. The waveform record length is sufficiently long for transient microphonic effects to be observable. Significant time is required by a subject matter expert to analyze and identify the intra-cavity signatures of imminent faults. This paper describes a path forward that utilizes machine lea...
A proposal was formulated to increase the CEBAF energy from the present 12 GeV to 20-24 GeV by re... more A proposal was formulated to increase the CEBAF energy from the present 12 GeV to 20-24 GeV by replacing the highest-energy arcs with Fixed Field Alternating Gradient (FFA) arcs. The new pair of arcs would provide six or seven new beam passes, going through this magnet array, allowing the energy to be nearly doubled using the existing CEBAF SRF cavity system. One of the immediate accelerator design tasks is to develop a proof-of-principle FFA arc magnet lattice that would support simultaneous transport of 6-7 passes with energies spanning a factor of two. We also examine the possibility of using combined function magnets to configure a cascade, six-way beam split switchyard. Finally, a novel multi-pass linac optics based on a weakly focusing lattice is being explored.
The electron and ion beams of a future Electron Ion Collider (EIC) must collide at an angle for d... more The electron and ion beams of a future Electron Ion Collider (EIC) must collide at an angle for detection, machine and engineering design reasons. To avoid associated luminosity reduction, a local crabbing scheme is used where each beam is crabbed before collision and de-crabbed after collision. The crab crossing scheme then provides a head-on collision for beams with a non-zero crossing angle. We develop a framework for accurate simulation of crabbing dynamics with beam-beam effects by combining symplectic particle tracking codes with a beam-beam model based on the Bassetti-Erskine analytic solution. We present simulation results using our implementation of such a framework where the beam dynamics around the ring is tracked using Elegant and the beam-beam kick is modeled in Python.
Beam synchronization of the future electron-ion collider (EIC) is studied with introducing differ... more Beam synchronization of the future electron-ion collider (EIC) is studied with introducing different bunch numbers in the two colliding beams. This allows non-pairwise collisions between the bunches of the two beams and is known as "gear-change", whereby one bunch of the first beam collides with all other bunches of the second beam, one at a time. Here we report on the study of how the beam dynamics of the Jefferson Lab Electron Ion collider concept is affected by the gear change. For this study, we use the new GPU-based code (GHOST). It features symplectic one-turn maps for particle tracking and Bassetti-Erskine approach for beam-beam interactions.
The JLab Simulation Package on Electron Cooling (JSPEC) is an open source software developed at J... more The JLab Simulation Package on Electron Cooling (JSPEC) is an open source software developed at Jefferson Lab for electron cooling and intrabeam scattering (IBS) simulations. IBS is an important factor that leads to the growth of the beam emittance and hence the reduction of the luminosity in a high density ion collider ring. Electron cooling is an effective measure to overcome the IBS effect. Although JSPEC is initiated to fulfill the simulation needs in JLab Electron Ion Collider project, it can be used as a general design tool for other accelerators. JSPEC provides various models of the ion beam and the electron beam and it calculates the expansion rate and simulates the evolution of the ion beam under the IBS and/or electron cooling effect. In this report, we will give a brief introduction of JSPEC and then present the latest code development progress of JSPEC, including new models, algorithms, and the user interface.
This report is an outcome of the workshop AI for Nuclear Physics held at Thomas Jefferson Nationa... more This report is an outcome of the workshop AI for Nuclear Physics held at Thomas Jefferson National Accelerator Facility on March 4–6, 2020
Futuremachines such as the Electron Ion Collider (MEIC), linac-ring machines (eRHIC) or LHeC are ... more Futuremachines such as the Electron Ion Collider (MEIC), linac-ring machines (eRHIC) or LHeC are particularly sensitive to beam-beam effects. This is the limiting factor for long-term stability and high luminosity reach. The complexity of the non-linear dynamics makes it challenging to perform such simulations typically requiring millions of turns. Until recently, most of the methods have involved using linear approximations and/or tracking for a limited number of turns. We have developed a framework which exploits a massively parallel Graphical Processing Units (GPU) architecture to allow for tracking millions of turns in a sympletic way up to an arbitrary order. The code is called GHOST for GPU-accelerated High-Order Symplectic Tracking. Our approach relies on a matrix-based arbitrary-order symplectic particle tracking for beam transport and the Bassetti-Erskine approximation for the beam-beam interaction. INTRODUCTION AND BACKGROUND The proper magnetic optics design and performan...
Future machines such as the electron-ion colliders (JLEIC), linac-ring machines (eRHIC) or LHeC a... more Future machines such as the electron-ion colliders (JLEIC), linac-ring machines (eRHIC) or LHeC are particularly sensitive to beam-beam effects. This is the limiting factor for long-term stability and high luminosity reach. The complexity of the non-linear dynamics makes it challenging to perform such simulations which require millions of turns. Until recently, most of the methods used linear approximations and/or tracking for a limited number of turns. We have developed a framework which exploits a massively parallel Graphical Processing Units (GPU) architecture to allow for tracking millions of turns in a symplectic way up to an arbitrary order and colliding them at each turn. The code is called GHOST for GPU-accelerated High-Order Symplectic Tracking. As of now, there is no other code in existence that can accurately model the single-particle non-linear dynamics and the beam-beam effect at the same time for a large enough number of turns required to verify the long-term stability...
The Continuous Electron Beam Accelerator Facility at Jefferson Lab has 200 RF cavities in the nor... more The Continuous Electron Beam Accelerator Facility at Jefferson Lab has 200 RF cavities in the north linac and the south linac respectively after the 12 GeV upgrade. The purpose of this work is to simultaneously optimize the heat load and the trip rates for the cavities and to reconstruct the Pareto-optimal front in a timely manner when some of the cavities are turned off. By choosing an efficient optimizer and strategically creating the initial gradients, the Paretooptimal front for up to 15 cavities turned off can be established in about 20 seconds.
Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosi... more Jefferson Lab is in the process of designing an electron ion collider with unprecedented luminosity at a 45 GeV center-of-mass energy. This luminosity relies on ion cooling in both the booster and the storage ring of the accelerator complex. The cooling in the booster will use a conventional DC cooler similar to the one at COSY. The high-energy storage ring, operating at a momentum of up to 100 GeV/nucleon, requires novel use of bunchedbeam cooling. There are two designs for such a cooler. The first uses a conventional Energy Recovery Linac (ERL) with a magnetized beam while the second uses a circulating ring to enhance both peak and average currents experienced by the ion beam. This presentation will describe the design of both the Circulator Cooling Ring (CCR) design and that of the backup option using the stand-alone ERL operated at lower charge but higher repetition rate than the ERL injector required by the CCRbased design.
We present an update on the development of the new code for long-term simulation of beam-beameffe... more We present an update on the development of the new code for long-term simulation of beam-beameffects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order particle tracking (including a symplectic option) for beam transport and the generalized Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel implementation on a hybrid GPU/CPU platform. With the new code, previouslycomputationallyprohibitivelongterm simulations become tractable. The new code will be used to model the proposed Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab.
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