publications

2023

1. Convergence map with action-angle variables based on square matrix for nonlinear lattice optimization

   Li Hua Yu, Yoshiteru Hidaka, Victor Smaluk, and 2 more authors

   Phys. Rev. Accel. Beams, May 2023

2022

1. Combined effects of crab dispersion and momentum dispersion in colliders with local crab crossing scheme

   Derong Xu, Yun Luo, and Yue Hao

   Phys. Rev. Accel. Beams, Jul 2022
2. Predicting beam transmission using 2-dimensional phase space projections of hadron accelerators

   Anthony Tran, Yue Hao, Brahim Mustapha, and 1 more author

   Frontiers in Physics, Jul 2022

   Abs

   We present a method to compress the 2D transverse phase space projections from a hadron accelerator and use that information to predict the beam transmission. This method assumes that obtaining at least three projections of the 4D transverse phase space is possible and that an accurate simulation model is available for the beamline. Using a simulated model, we show that—a computer can train a convolutional autoencoder to reduce phase-space information which can later be used to predict the beam transmission. Finally, we argue that although using projections from a realistic nonlinear distribution produces less accurate results, the method still generalizes well.

2021

1. Fast dynamic aperture optimization with forward-reversal integration

   Yongjun Li, Yue Hao, Kilean Hwang, and 3 more authors

   Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Jul 2021

   Abs

   A fast dynamic aperture (DA) optimization method for storage rings has been developed through the use of reversal integration. Even if dynamical systems have an exact reversal symmetry, a numerical forward integration differs from its reversal. For a chaotic trajectory, cumulative round-off errors are scaled, which results in an exponential growth on the difference. The exponential effect is a generic chaos indicator which represents the sensitivity of the chaotic motion to its initial condition. The chaos indicator of the charged particle motion can be obtained by comparing the forward integrations of particle trajectories with corresponding reversals, a.k.a. “backward integrations.” The indicator is observable even through short-term particle tracking simulations. Therefore, adopting it as an objective function could speed up optimization. The DA of the National Synchrotron Light Source II storage ring, and another test diffraction-limited light source ring, were optimized using this method for the purpose of demonstration.

2. Synchrobetatron resonance of crab crossing scheme with large crossing angle and finite bunch length

   Derong Xu, Yue Hao, Yun Luo, and 1 more author

   Phys. Rev. Accel. Beams, Apr 2021

2019

1. Advances of the FRIB project

   J. Wei, H. Ao, S. Beher, and 44 more authors

   International Journal of Modern Physics E, Apr 2019

2017

1. Conceptual design of a high real-estate gradient cavity for a SRF ERL

   Chen Xu, Ilan Ben-Zvi, Yue Hao, and 2 more authors

   Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Apr 2017

   Abs

   The term “real-estate gradient” is used to describe the energy gain provided by an accelerating structure per actual length it takes in the accelerator. given that the length of the tunnel available for the accelerator is constrained, the real-estate gradient is an important measure of the efficiency of a given accelerator structure. When designing an accelerating cavity to be efficient in this sense, the unwanted Higher Order Mode (HOM) fields should be reduced by suitable HOM dampers. This is a particularly important consideration for high current operation. The additional RF components might take longitude space and reduce the total accelerating efficiency. We describe a new high efficiency 5-cell cavity with the dampers included. The total length of the cavity is reduced by 13% as compared to a more conventional design without compromising the cavity fundamental-mode performance. In addition, the HOM impedance is reduced for a higher Beam-Break-Up (BBU) threshold of operating current. In this paper, we consider an example, a possible application at the eRHIC Energy Recovery Linac (ERL).

2. Multiple bunch HOM evaluation for ERL cavities

   Chen Xu, I. Ben-Zvi, Michael M. Blaskiewicz, and 2 more authors

   Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Jun 2017

2016

1. Electron-Ion Collider: The next QCD frontier: Understanding the glue that binds us all

   A. Accardi, J. L. Albacete, M. Anselmino, and 75 more authors

   European Physical Journal. A, Sep 2016

2014

1. Beam-beam effects of gear changing in ring-ring colliders

   Yue Hao, V. N. Litvinenko, and V. Ptitsyn

   Phys. Rev. ST Accel. Beams, Apr 2014

2013

1. Compensating effect of the coherent synchrotron radiation in bunch compressors

   Yichao Jing, Yue Hao, and Vladimir N. Litvinenko

   Phys. Rev. ST Accel. Beams, Jun 2013
2. Mitigation of the kink instability in the energy recovery linac based electron-ion collider

   Yue Hao, Vladimir N. Litvinenko, and Vadim Ptitsyn

   Phys. Rev. ST Accel. Beams, Oct 2013

2012

1. A Large Hadron Electron Collider at CERN Report on the Physics and Design Concepts for Machine and Detector

   J L Abelleira Fernandez, C Adolphsen, A N Akay, and 189 more authors

   Journal of Physics G: Nuclear and Particle Physics, Jul 2012

   Abs

   The physics programme and the design are described of a new collider for particle and nuclear physics, the Large Hadron Electron Collider (LHeC), in which a newly built electron beam of 60 GeV, to possibly 140 GeV, energy collides with the intense hadron beams of the LHC. Compared to the first ep collider, HERA, the kinematic range covered is extended by a factor of twenty in the negative four-momentum squared, Q2, and in the inverse Bjorken x, while with the design luminosity of 1033 cm-2 s-1 the LHeC is projected to exceed the integrated HERA luminosity by two orders of magnitude. The physics programme is devoted to an exploration of the energy frontier, complementing the LHC and its discovery potential for physics beyond the Standard Model with high precision deep inelastic scattering measurements. These are designed to investigate a variety of fundamental questions in strong and electroweak interactions. The LHeC thus continues the path of deep inelastic scattering (DIS) into unknown areas of physics and kinematics. The physics programme also includes electron-deuteron and electron-ion scattering in a (Q21/x) range extended by four orders of magnitude as compared to previous lepton-nucleus DIS experiments for novel investigations of neutron’s and nuclear structure, the initial conditions of Quark-Gluon Plasma formation and further quantum chromodynamic phenomena. The LHeC may be realised either as a ring-ring or as a linac-ring collider. Optics and beam dynamics studies are presented for both versions, along with technical design considerations on the interaction region, magnets including new dipole prototypes, cryogenics, RF, and further components. A design study is also presented of a detector suitable to perform high precision DIS measurements in a wide range of acceptance using state-of-the art detector technology, which is modular and of limited size enabling its fast installation. The detector includes tagging devices for electron, photon, proton and neutron detection near to the beam pipe. Civil engineering and installation studies are presented for the accelerator and the detector. The LHeC can be built within a decade and thus be operated while the LHC runs in its high-luminosity phase. It so represents a major opportunity for progress in particle physics exploiting the investment made in the LHC.

2010

1. Effect of electron disruption in the energy recovery linac based electron ion collider

   Y. Hao, and V. Ptitsyn

   Phys. Rev. ST Accel. Beams, Jul 2010