Georg Hoffstaetter
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View article: BAGELS for simultaneous polarization, orbit, and optics control in electron storage rings
BAGELS for simultaneous polarization, orbit, and optics control in electron storage rings Open
We present a new method for minimizing the effects of radiative depolarization in electron storage rings by use of a minimal number of special vertical orbit bumps. The bumps can be used to minimize the effects of radiative depolarization …
View article: Error Determination in Sextupole Magnet Calibration and Alignment Measurements and Application to Horizontal Beam Size Calculations at the Cornell Electron-positron Storage Ring
Error Determination in Sextupole Magnet Calibration and Alignment Measurements and Application to Horizontal Beam Size Calculations at the Cornell Electron-positron Storage Ring Open
We report on measurements and modeling studies performed from 2021 to 2024 on the 76 sextupole magnets in the Cornell Electron-positron Storage Ring CESR. Beam-based, magnet-specific calibrations ($K_2$ value versus excitation current) wer…
View article: Optimization of cooling distribution of the EIC SHC cooler ERL
Optimization of cooling distribution of the EIC SHC cooler ERL Open
The Electron-Ion Collider (EIC) Hadron Storage Ring (HSR) will use strong hadron cooling to maintain the beam brightness and high luminosity during long collision experiments. An Energy Recovery Linac is used to deliver the high-current hi…
View article: Resonant matching section for CEBAF energy upgrade
Resonant matching section for CEBAF energy upgrade Open
Thomas Jefferson National Accelerator Facility (Jefferson Lab) currently studies the feasibility of upgrading its energy to 22GeV. It considers addition of six more linac passes. The highest energy passes will share two new arcs designed u…
View article: The EIC accelerator: design highlights and project status
The EIC accelerator: design highlights and project status Open
The design of the electron-ion collider (EIC) at Brookhaven National Laboratory is well underway, aiming at a peak electron-proton luminosity of 10e+34 cm^-1·sec^-1. This high luminosity, the wide center-of-mass energy range from 29 to 141…
View article: Test of a DC-photogun injector for the Lighthouse facility
Test of a DC-photogun injector for the Lighthouse facility Open
Worldwide there is a push for producing medical isotopes using particle accelerators rather than fission reactors. Here we report on the operation of the beam test facility (BTF), set up and operated at the RI site in Bergisch Gladbach, Ge…
View article: AGS booster beam-based main quadrupole transfer function measurements
AGS booster beam-based main quadrupole transfer function measurements Open
Physics models, particularly for online operations, such as for our MAD-X or Bmad models, depend on a good understanding of the magnet characteristics. While we often measure the magnets or some subset of the magnets, those measurements ar…
View article: Proton and electron RLA optics design
Proton and electron RLA optics design Open
We describe optics designs of the key components of proton and electron Recirculating Linear Accelerators (RLAs). They are presented in the context of a high-power hadron accelerator being considered at ORNL and a CEBAF electron energy dou…
View article: Design status of the Electron-Ion Collider
Design status of the Electron-Ion Collider Open
The Electron-Ion Collider is gearing up for "Critical Decision 2", the project baseline with defined scope, cost and schedule. Lattice designs are being finalized, and preliminary component design is being carried out. Beam dynamics studie…
View article: CEBAF 22 GeV FFA energy upgrade
CEBAF 22 GeV FFA energy upgrade Open
Extending the energy reach of CEBAF by increasing the number of recirculations, while using the existing linacs is explored. This energy upgrade is based on the multi-pass acceleration of electrons in a single non-scaling Fixed Field Alter…
View article: Optimizing the design tunes of the electron storage ring of the Electron-Ion Collider
Optimizing the design tunes of the electron storage ring of the Electron-Ion Collider Open
The Electron-Ion Collider (EIC) presently under construction at Brookhaven National Laboratory will collide polarized high energy electron beams with hadron beams with luminosities up to 10^34cm^{-2}s^{-1} in the center mass energy range o…
View article: CEBAF 22 GeV FFA energy upgrade
CEBAF 22 GeV FFA energy upgrade Open
Extending the energy reach of CEBAF by increasing the number of recirculations, while using the existing linacs is explored. This energy upgrade is based on the multi-pass acceleration of electrons in a single non-scaling Fixed Field Alter…
View article: Accelerators for Electroweak Physics and Higgs Boson Studies
Accelerators for Electroweak Physics and Higgs Boson Studies Open
We discuss the goals, the designs, the state of technical readiness, and the critical R&D needs of the accelerators that are currently under discussion as Higgs and electroweak factories. We also address the respective staging options enab…
View article: Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a dc gun and a multicavity superconducting rf linac
Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a dc gun and a multicavity superconducting rf linac Open
We present the design of a high repetition rate MeV energy ultrafast electron diffraction instrument based on a dc photoelectron gun and an superconducting rf (SRF) linac with multiple independently controlled accelerating and bunching cav…
View article: Optimization of chromatic optics in the electron storage ring of the Electron-Ion Collider
Optimization of chromatic optics in the electron storage ring of the Electron-Ion Collider Open
We have developed a new chromatic compensation scheme for the electron storage ring with two low-beta interaction regions in the Electron-Ion Collider. The hybrid scheme consists of the modular chromatic matching of periodic systems and be…
View article: The Development of Energy-Recovery Linacs
The Development of Energy-Recovery Linacs Open
Energy-recovery linacs (ERLs) have been emphasised by the recent (2020) update of the European Strategy for Particle Physics as one of the most promising technologies for the accelerator base of future high-energy physics. The current pape…
View article: Electric dipole moments and the search for new physics
Electric dipole moments and the search for new physics Open
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well beyond those reached directly at high energy colliders. Discrimination between different physics models, however, requires…
View article: Bayesian optimization experiment for trajectory alignment at the low energy RHIC electron cooling system
Bayesian optimization experiment for trajectory alignment at the low energy RHIC electron cooling system Open
The low energy RHIC electron cooling (LEReC) system is the world’s first electron cooler utilizing radio frequency (rf) accelerated electron bunches, and a nonmagnetized electron beam. It is also the first electron cooler applied directly …
View article: Accelerator Physics Lessons from CBETA, the First Multi-Turn SRF ERL
Accelerator Physics Lessons from CBETA, the First Multi-Turn SRF ERL Open
The Cornell-BNL ERL Test Accelerator (CBETA) has been designed, constructed, and commissioned in a collaboration between Cornell and BNL. It focuses on energy-saving measures in accelerators, including permanent magnets, energy recovery, a…
View article: RLAs with FFA Arcs for Protons and Electrons
RLAs with FFA Arcs for Protons and Electrons Open
Recirculating Linear Accelerators (RLAs) provide an efficient way of producing high-power, high-quality, continuous-wave hadron and lepton beams. However, their attractiveness had been limited by the cumbersomeness of multiple recirculatin…
View article: Electron Accelerator Lattice Design for LHeC with Permanent Magnets
Electron Accelerator Lattice Design for LHeC with Permanent Magnets Open
We present a new ’green energy’ approach to the Energy Recovery Linac (ERL) the future Electron Ion Collider at LHeC using single beam line made of very strong focusing combined function permanent magnets and the Fixed Field Alternating Li…
View article: Current Status of the FFA@CEBAF Energy Upgrade Study
Current Status of the FFA@CEBAF Energy Upgrade Study Open
This work will describe the current status of the FFA@CEBAF energy upgrade feasibility studies. Technical updates are given, but more specific details are left to separate contributions. Specifically, this work will discuss improvements to…
View article: Different forms of first order spin-orbit motion and their utility in spin matching in electron storage rings
Different forms of first order spin-orbit motion and their utility in spin matching in electron storage rings Open
We derive the first order phase space dependence of spin-orbit motion of a particle in an accelerator by expanding the Thomas-BMT equation. Different forms can be found in the literature and we show how these are related, and care is taken…
View article: Task Force Report: ESR Linear Lattice Design
Task Force Report: ESR Linear Lattice Design Open
A new layout and optics for the Electron Storage Ring (ESR) have been produced with revised spin rotators in IRs 6 and 8, a redesign of IR10, and a new geometric layout for the ring. In this report, the efforts to produce this lattice are …
View article: Simulations of future particle accelerators: issues and mitigations
Simulations of future particle accelerators: issues and mitigations Open
The ever increasing demands placed upon machine performance have resulted in the need for more comprehensive particle accelerator modeling. Computer simulations are key to the success of particle accelerators. Many aspects of particle acce…
View article: Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a DC gun and a multi-cavity SRF linac
Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a DC gun and a multi-cavity SRF linac Open
We present the design of a high repetition rate MeV energy ultrafast electron diffraction instrument based on a DC photoelectron gun and an SRF linac with multiple independently controlled accelerating and bunching cavities. The design is …
View article: Intense monochromatic photons above 100 keV from an inverse Compton source
Intense monochromatic photons above 100 keV from an inverse Compton source Open
Quasimonochromatic x rays are difficult to produce above 100 keV, but have a number of uses in x-ray and nuclear science, particularly in the analysis of transuranic species. Inverse Compton scattering (ICS) is capable of fulfilling this n…
View article: Yuri Fyodorovich Orlov
Yuri Fyodorovich Orlov Open
Yuri Fyodorovich Orlov was an inspiration to many people worldwide through his unrelenting pursuit of science in difficult circumstances, his many contributions to accelerator physics, his courageous sacrifices for human rights in the USSR…
View article: Technology Spinoff and Lessons Learned from the 4-Turn ERL CBETA
Technology Spinoff and Lessons Learned from the 4-Turn ERL CBETA Open
The Cornell-BNL ERL Test Accelerator (CBETA) developed several energy-saving measures: multi-turn energy recovery, low-loss superconducting radiofrequency (SRF) cavities, and permanent magnets. With green technology becoming imperative for…
View article: Design Status Update of the Electron-Ion Collider
Design Status Update of the Electron-Ion Collider Open
The design of the electron-ion collider EIC to be constructed at Brookhaven National Laboratory has been continuously evolving towards a realistic and robust design that meets all the requirements set forth by the nuclear physics community…