A5022243162- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Scientific Computing and Data Management
- Advanced Data Storage Technologies
- IPv6, Mobility, Handover, Networks, Security
- Network Security and Intrusion Detection
- Mobile Agent-Based Network Management
- Radiation Detection and Scintillator Technologies
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Peer-to-Peer Network Technologies
- FinTech, Crowdfunding, Digital Finance
- Advanced MRI Techniques and Applications
- Distributed and Parallel Computing Systems
- Internet Traffic Analysis and Secure E-voting
- Data Quality and Management
- Algorithms and Data Compression
- Semantic Web and Ontologies
- Electron and X-Ray Spectroscopy Techniques
- Smart Grid Security and Resilience
Cornell University
2007-2020
Diamond Light Source
2018
American University of Beirut
2016
University of Liverpool
2011
University of Colorado Denver
2009
We report on the observation of incoherent Cherenkov radiation emitted by a 5.3 GeV positron beam circulating in Cornell electron-positron storage ring as passes close vicinity surface fused silica radiator (i.e., at distance larger than 0.8 mm). The shape was designed order to send photons towards detector, consisting compact optical system equipped with an intensified camera. allows both measurements 2D images and angular distribution including polarization study. corresponding light...
In recent years, there has been an increasing demand for noninvasive beam size monitoring on particle accelerators. Ideally, these monitors should be cost effective and require little or no maintenance. These also suitable both linear circular machines. Here, the experimental setup is described in detail, results from a diffraction radiation monitor are presented. This tested Cornell Electron Storage Ring using 1 mA ($1.6\ifmmode\times\else\texttimes\fi{}{10}^{10}$ particles per bunch)...
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 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to serve as a testbed for International Linear Collider (ILC) damping rings. One of primary goals CESR Test Accelerator (CesrTA) project is develop fast low-emittance tuning method which scales well large rings such ILC rings, and routinely achieves vertical emittance order 10 pm at 2.085 GeV. This paper discusses methods developed CesrTA achieve conditions. iteration beam-based...
During the summer and fall of 2018 Cornell High Energy Synchrotron Source (CHESS) is undergoing an upgrade to increase high-energy flux for x-ray users. The requires replacing one-sixth Electron Storage Ring (CESR), inverting polarity half CHESS beam lines, switching single-beam on-axis operation. new sextant comprised six double-bend achromats (DBAs) with combined-function dipole-quadrupoles. Although DBA design widely utilized well understood, constraints CESR modifications make CHESS-U...
Low emittance tuning at the Cornell Electron Storage Ring (CESR) test accelerator depends on precision measurement of vertical dispersion and transverse coupling. The CESR beam position monitors (BPMs) consist four button electrodes, instrumented with electronics that allow acquisition turn-by-turn data. response to will vary among electrodes due differences in electronic gain and/or misalignment. This variation BPM couple real horizontal offset apparent position, introduce spurious...
We report modeling results for electron cloud buildup and instability in the International Linear Collider positron damping ring. Updated optics, wiggler magnets, vacuum chamber designs have recently been developed 5 GeV, 3.2-km racetrack layout. An analysis of synchrotron radiation profile around ring has performed, including effects diffuse specular photon scattering on interior surfaces chamber. The provide input to simulations various magnetic field regions modeled densities thus...
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...
The Cornell Electron-positron Storage Ring (CESR) has been converted from a High Energy Physics electron-positron collider to operate as dedicated synchrotron light source for the Synchrotron Source (CHESS) and conduct accelerator physics research test accelerator, capable of studying topics relevant future damping rings, colliders sources. Some specific that were targeted initial phase operation storage ring in this mode, labeled CesrTA (CESR Test Accelerator), included 1) tuning techniques...
We describe a new technique for low-emittance tuning of electron and positron storage rings. This is based on calibration the beam position monitors (BPMs) using excitation normal modes motion, has benefits over conventional methods. It relatively fast straightforward to apply, it can be as easily applied large ring small ring, low emittance becomes completely insensitive BPM gain alignment errors that difficult determine accurately. discuss theory behind technique, present some simulation...
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...