A5078854309- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Spacecraft and Cryogenic Technologies
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Optical Coatings and Gratings
- Muon and positron interactions and applications
- Cyclone Separators and Fluid Dynamics
- Advancements in Photolithography Techniques
- Photocathodes and Microchannel Plates
- Photonic and Optical Devices
- Superconducting and THz Device Technology
- Aerosol Filtration and Electrostatic Precipitation
- Parallel Computing and Optimization Techniques
- Life Cycle Costing Analysis
- Crystallography and Radiation Phenomena
- Fault Detection and Control Systems
- Engineering Applied Research
- Turbomachinery Performance and Optimization
- Advanced Data Storage Technologies
- Advanced Multi-Objective Optimization Algorithms
University of California, Berkeley
2023
Lawrence Berkeley National Laboratory
2021-2023
Paul Scherrer Institute
2016-2023
Cornell University
2007-2018
Fourth-generation storage rings enabled by multi-bend achromat lattices are being inaugurated worldwide and many more planned for the next decade. These sources deliver stable ultra-high brightness radiation with unmatched levels of transverse coherence virtue their highly advanced magnetic lattices. Optimization these challenging strongly nonlinear degrees freedom bounded extensive sets constraints multiple often conflicting optimization goals is demanding requires application most...
A multiobjective genetic algorithm is developed for optimizing nonlinearities in diffraction limited storage rings. This determines sextupole and octupole strengths chromaticity correction that deliver optimized dynamic aperture beam lifetime. The makes use of dominance constraints to breed desirable properties into the early generations. momentum indirectly by constraining chromatic tune footprint off-energy aperture. result an effective computationally efficient technique correcting a ring...
Following the spectacular success of third-generation light source over past decades, a few new-generation sources based on multibend achromat (MBA) scheme have come into operation. Other such facilities are also under construction while existing ones being upgraded. Likewise, Swiss Light Source, which has been in operation for more than 20 years at Paul Scherrer Institute, is to be upgraded with present storage ring replaced by an MBA low-emittance ring. A natural emittance 158 pm beam...
Intrabeam scattering (IBS) limits the emittance and single-bunch current that can be achieved in electron or positron storage ring colliders, damping rings, light sources. Much theoretical work on IBS exists, while theories have been validated hadron ion machines, presence of strong makes lepton machines a different phenomenon. We present results measurements at CesrTA IBS-dominated beams, compare data with theory. The beams we study parameters typical those specified for next generation...
In storage rings, horizontal dispersion in the rf cavities introduces horizontal-longitudinal (xz) coupling, contributing to beam tilt xz plane. This coupling can be characterized by a "crabbing" term {\zeta}a that appears normal mode decomposition of 1-turn transfer matrix. is proportional cavity voltage and cavity. We report experiments at Cornell Electron Storage Ring Test Accelerator (CesrTA) where was explored using three lattices with distinct crabbing properties. characterize for each...
A new storage ring is planned for the upgrade of Swiss Light Source (SLS). It will replace 12 triple bend achromats by twelve 7-bend achromats, which are based on low aperture longitudinal gradient bends (LGBs) and anti-bends (ABs), thus reducing emittance from 5.0 nm to about 150 pm at 2.4 GeV while maintaining source points undulator beam lines. Sextupole octupole strengths determined using a multi-objective genetic algorithm (MOGA) result in sufficient dynamic off-axis injection several...
Beginning in April 2008, we propose to employ the Cornell electron storage ring (CESR) a program of research and development for international linear collider (ILC) Damping Rings (DR). This paper provides an update on conceptual design issues CESR reconfiguration details experimental that will follow.
Recent reports from CesrTA have shown measurement and calculation of beam size versus current in beams at 2.1 GeV. Here, the effect changing energy Intra- Scattering-dominated is reported. IBS growth rates roughly a γ −3 dependence. Measurements 1.8, 2.1, 2.3, 2.5 GeV are compared with predictions theory. x, y , then total emittance bunch can increase. The horizontal dispersion rather large, rms value 1 m peaks about 3 m. Hx 0.11 0.37 has been measured to blow up times single- particle...
Fast Ion Instability can lead to deterioration of an electron beam (increasing emittance and instability a train bunches) in storage rings linacs. We study this at the Cornell Electron Storage Ring Test Accelerator using 2.1 GeV low beam. As source ions is residual gas, our measurements are conducted various pressures, including nominal vacuum as well injected gas (Ar, Kr). measure turn-by-turn vertical bunch size position, multi-bunch power spectrum. A detailed simulation then used compare...
A beam-based technique is applied to determine the quadrupole impedance of large-impedance components CESR storage ring. Two bunches separated by 1/3 ring circumference are charged 1.44 × 1010 and 0.48 N/bunch (0.9 0.3 mA). Both given a single kick same amplitude. Turn-by-turn, bunch-by-bunch position information recorded for 16 k turns. BPM-by-BPM phase calculated using All-phase FFT method spectral analysis. The difference in BPM-to-BPM advance between two measurement local transverse...
The ALS-U light source will implement on-axis single-train swap-out injection employing an accumulator between the booster and storage rings. ring design is a twelve period triple-bend achromat that be installed along inner circumference of storage-ring tunnel. A non-conventional scheme utilized for top-off off-axis from into meant to accommodate large $\sim 300$~nm emittance beam vacuum-chamber with limiting horizontal aperture radius as small $8$ mm. incorporates three dipole kickers...
An upgrade to the SLS is currently under development. This will likely utilize same hall and machine circumference, 288 m, of SLS. Achieving a sufficiently low emittance with such small circumference requires tight focusing dispersion. These conditions make chromaticity correction difficult minimization 1st 2nd order non-linear driving terms does not yield sufficient dynamic aperture Touschek lifetime. In this proceeding, we discuss multi-objective genetic optimization method being...