A5005188293- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Noncommutative and Quantum Gravity Theories
- Muon and positron interactions and applications
- Antenna Design and Optimization
- Laser-Plasma Interactions and Diagnostics
- Quantum Information and Cryptography
- Quantum and Classical Electrodynamics
- Radiation Detection and Scintillator Technologies
- Advanced X-ray Imaging Techniques
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Fusion materials and technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Neutrino Physics Research
- Cybersecurity and Information Systems
Cornell University
1989-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2021
Brookhaven National Laboratory
2017
Wayne State University
1998
The anomalous magnetic moment of the muon is one most precisely measured quantities in experimental particle physics. Its latest measurement at Brookhaven National Laboratory deviates from Standard Model expectation by approximately 3.5 standard deviations. goal new experiment, E989, now under construction Fermilab, a fourfold improvement precision. Here, we discuss details future and its current status.
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...
Particle storage rings are a rich application domain for online optimization algorithms. The Cornell Electron Storage Ring (CESR) has hundreds of independently powered magnets, making it high-dimensional test-problem algorithmic tuning. We investigate algorithms that restrict the search space to small number linear combinations parameters ("knobs") which contain most effect on our chosen objective (the vertical emittance), thus enabling efficient report experimental tests at CESR use...
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...
This report outlines the status of beam operations at SARAF accelerator during 2012. Performance various subsystems, their limiting factors and recent improvements are presented. The accumulated experience proton operation is summarized. Future prospects discussed.
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...
A proposed experiment to demonstrate optical stochastic cooling (OSC) in the Cornell Electron Storage Ring (CESR) based on an arc-bypass design is presented. This arc bypass provides significantly longer delay than dog-leg style chicane, opening up possibility of a multipass or staged amplifier that can achieve gains required for effective hadron heavy ions. Beyond introducing bypass, this paper we study stability requirements dipoles comprising it and investigate use feedback system relax...
The CESR luminosity upgrade plan calls for shortening bunch length to 1 cm. Such can be achieved by installing two more superconducting cavities increase total RF voltage. system necessary accommodate this change is discussed.
We report here the first experimental result for anisotropy of one-way maximum attainable speed electron, $\mathrm{\ensuremath{\Delta}}{\stackrel{\ensuremath{\rightarrow}}{c}}_{1,e}$, obtained via study a sidereal time dependence difference between momenta counterrotating electron and positron beams in Cornell Electron Storage Ring at University. At 95% confidence, an upper limit component $\mathrm{\ensuremath{\Delta}}{\stackrel{\ensuremath{\rightarrow}}{c}}_{1,e}/c$ perpendicular to Earth's...
Using the silicon strip detector of CLEO experiment operating at Cornell Electron-Positron Storage Ring (CESR), we have observed that horizontal size luminous region decreases in presence beam-beam interaction from what is expected without interaction. The dependence on bunch current agrees with prediction dynamic beta effect. This first direct observation
The Long Range Beam-Beam Interaction (LRBBI) is one of major limiting factor to the performance a pretzel collider machine like CESR in which each bunch has several tens parasitic crossing points along ring. To investigate effects due LRBBI, simulation studies are done with new code weak-strong and strong-strong scenarios. precise simulations reveal that case CESR, significant on parameters. Especially bunch-by-bunch differences, can hardly be compensated by routine adjustments operation...
Transverse vertical wakefields can increase emittance and distort the phase space of a bunch in storage ring. Here we report recent measurements simulations these effects from movable scrapers at Cornell electron-positron ring test accelerator. Charge-dependent beam size growth was observed with single scraper inserted through top vacuum chamber. No change bottom symmetrically. The apparent due large part to $yz$ coupling (vertical crabbing) induced by transverse monopole wake asymmetric...
In preparation for a demonstration of optical stochastic cooling in Cornell Electron Storage Ring, we have developed particle tracking simulation to study the relevant beam dynamics. Optical radiation emitted pickup undulator gives momentum kick that same kicker undulator. The optics electron bypass from couples betatron amplitude and offset path length so reduces emittance spread. Nearby electrons contribute an incoherent noise. Layout line is presented accommodates with range transverse...
We report on extensive measurements at the Cornell Electron-positron Storage Ring of electron-cloud-induced betatron tune shifts for trains positron bunches 2.1 and 5.3 GeV with bunch populations ranging between 0.64x10^10 9.6x10^10. Measurements using a witness variable distance from end train population provide information cloud decay pinching during passage. employ Monte Carlo simulations reflection absorption synchrotron radiation photons to determine pattern sites around circumference...
Due to the extraordinary sensitivity of beams misalignments superconducting high gradient interaction region magnets for Phase III upgrade, a beam-based alignment and active positioning scheme has been designed is being constructed. Using cams kinematic mounting, magnetic centers four quadrupole will be independently positioned over radial range 1 mm with resolution below 10 /spl mu/m. Beam measurements closed orbit determine where set position. In principle realignment can done while are...
Stored beams containing trains of bunches can excite trapped higher-order modes (HOM) in discontinuities such as sliding joints (SLDJTs). Due to the relatively high Q, fields excited by multiple a SLDJT interfere constructively and coherent enhancement may result at certain openings for given bunch spacing. This resonant HOM loss causes abnormal heating pose an operational problem CESR beam currents or short lengths. Calculations show resonance behavior depending on spacing within each...
In the Cornell Electron Storage Ring (CESR), which is operated with nine trains of five bunches, bunch lengthening results from interaction wake voltage induced at hundred sliding joints along ring. The decay time for longer than between bunches. Therefore witnessed by successive bunches will depend on both resonance frequency joint cavity and arrival this paper we study differences in equilibrium within train due to wakes two different frequencies. One achieve minimum power loss second lengthening.