A5027336290- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Photocathodes and Microchannel Plates
- Radiation Detection and Scintillator Technologies
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Particle physics theoretical and experimental studies
- Gyrotron and Vacuum Electronics Research
- Enzyme Structure and Function
- Vacuum and Plasma Arcs
- Radiation Effects in Electronics
- Radiation Therapy and Dosimetry
- Atomic and Molecular Physics
- Medical Imaging Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Advancements in Photolithography Techniques
- Plasma Diagnostics and Applications
- Calibration and Measurement Techniques
- Crystallography and Radiation Phenomena
- Pulsed Power Technology Applications
- CCD and CMOS Imaging Sensors
- Ion-surface interactions and analysis
Cornell University
2013-2024
Xelera Research (United States)
2016-2024
Brookhaven National Laboratory
2018-2020
High-power, high-brightness electron beams are of interest for many applications, especially as drivers free lasers and energy recovery linac light sources. For these particular photoemission injectors used in most cases, the initial beam brightness from injector sets a limit on quality generated at end accelerator. At Cornell University, we have built such high-power using DC gun followed by superconducting accelerating module. Recent results will be presented demonstrating record setting...
We present a detailed study of the six-dimensional phase space electron beam produced by Cornell Energy Recovery Linac Photoinjector, high-brightness, high repetition rate (1.3 GHz) DC photoemission source designed to drive hard x-ray energy recovery linac (ERL). A complete simulation model injector has been constructed, verified measurement, and optimized. Both horizontal vertical 2D transverse spaces, as well time-resolved (sliced) space, were simulated directly measured at end for 19 77...
Energy recovery has been achieved in a multipass linear accelerator, demonstrating technology for more compact particle accelerators operating at higher currents and reduced energy consumption. delivered to the beam during first four passes through accelerating structure was recovered subsequent decelerating passes. High-energy efficiency by use of superconducting cavities permanent magnets. The fixed-field alternating-gradient optical system used return loop successfully transported...
Sodium potassium antimonide photocathodes with Quantum Efficiency (QE) in the range of few percent have been grown, and their photoemission properties are measured. We report intrinsic emittance response time electron bunches extracted from this material. It is possible to recover QE an overheated cathode by simple addition, rugged enough deliver tens mA average current no or minimal degradation.
The Cornell University energy recovery linac (ERL) photoinjector has recently demonstrated operation at 20 mA for approximately 8 hours, utilizing a multialkali photocathode deposited on Si substrate. We describe the recipe deposition, and will detail parameters of run. Post-run analysis indicates presence significant damage to substrate, perhaps due ion back-bombardment from residual beam line gas. While exact cause substrate remains unknown, we multiple surface characterization techniques...
A new high voltage photoemission gun has been constructed at Cornell University which features a segmented insulator and movable anode, allowing the cathode-anode gap to be adjusted. In this work, we describe gun's overall mechanical design, surface preparation of components, as well clean construction methods. We present conditioning data using 50 mm gap, in exceeds 500 kV, smaller gaps. Finally, simulated emittance results obtained from genetic optimization scheme values based on data....
We have constructed a very high voltage DC photoemission electron gun as the source of an injector for Energy Recovery Linac (ERL) based synchrotron radiation light source. The is designed to deliver 100 mA average beam current in 1300 MHz CW bunch train (77 pC/bunch), and operate up 750 kV cathode potential. Negative affinity (NEA) photocathodes are used their small thermal emittance quantum efficiency. A load-lock system allows introduction, cleaning, activation cathodes outside gun....
This design report describes the construction plans for world's first multi-pass SRF ERL. It is a 4-pass recirculating linac that recovers beam's energy by 4 additional, decelerating passes. All beams are returned deceleration in single beam pipe with large-momentum-aperture permanent magnet FFAG optics. Cornell University has been pioneering new class of accelerators, Energy Recovery Linacs (ERLs), characteristic set parameters. Technology prototyped essential any high brightness electron...
The Low Energy RHIC electron Cooling (LEReC) project at Brookhaven National Laboratory recently demonstrated for the first time cooling of hadron bunches with radio-frequency (rf) accelerated bunches. LEReC uses a high-voltage photoemission gun stringent requirements beam current, quality, and stability. has photocathode high-power fiber laser, novel cathode production, transport, exchange system. It been that can continually produce high-current quality suitable cooling. We describe...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation K. Smolenski, I. Bazarov, B. Dunham, H. Li, Y. X. Liu, D. Ouzounov, C. Sinclair; Design Performance of the Cornell ERL DC Photoemission Gun. AIP Conf. Proc. 4 August 2009; 1149 (1): 1077–1083. https://doi.org/10.1063/1.3215596 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley...
After construction of a prototype unit, five additional wiggler magnets for the CESR-c conversion have been completed at rate exceeding one per month. These 2.1 T superferric are built and assembled primarily in house with minimal staff. We describe general design fabrication methods these magnets. An 10 will be constructed to complete complement ring plus two spare units.
We describe the status of plans to build an Energy-Recovery Linac (ERL) X-ray facility at Cornell University. This 5 GeV ERL is upgrade CESR ring that currently powers High Energy Synchrotron Source (CHESS) [1]. Due its very small electron-beam emittances, it would dramatically improve capabilities light source and result in beams orders magnitude better than any existing storage-ring source. The emittances are based upon simulations for currents competitive with ring-based sources [2, 4]....
Cornell University has prototyped technology essential for any high brightness electron ERL. This includes a DC gun and an SRF injector Linac with world-record current normalized in bunch train, high-current CW cryomodule, high-power beam stop, several diagnostics tools high-brightness beams, e.g. slid measurements 6-D phase-space densities, fast wire scanner profiles, loos diagnostics. All these are now available to equip one-cryomodule ERL, laboratory space been cleared out is radiation...
A 1300 MHz deflecting cavity will be used for beam slice emittance measurements, and to study the temporal response of negative electron affinity photocathodes in ERL injector currently under construction at Cornell University. single-cell TM110-mode was designed deflect vertically. The paper describes shape optimization procedure, its mechanical design performance low RFpower.
We have developed a cost-effective, fast rotating wire scanner for use in accelerators where high beam currents would otherwise melt even carbon wires. This new design uses simple planetary gear setup to rotate wire, fixed at one end, through the speeds excess of $20\text{ }\text{ }\mathrm{m}/\mathrm{s}$. present results from bench tests, as well transverse profile measurements taken Cornell's high-brightness energy recovery linac photoinjector, up 35 mA.
A double crystal, multilayer monochromator was designed and fabricated for a wiggler beamline at the Cornell High Energy Synchrotron Source. The consists of an internally water-cooled first substrate fixed-radius sagittally focusing second substrate, each coated with consisting 100 bilayers tungsten/carbon 27 Å d spacing. Cooled silicon substrates were internal water cooling channels to reduce or eliminate thermal distortion. wide energy bandpass this along sagittal provides best available...
At Cornell University, we have designed and built a DC photoemission electron gun that is capable of operating above 500 kV up to 100 mA average current. Such the best choice as high power driver for an RF linear accelerator. High brightness guns must fulfill difficult set requirements in order provide types beams needed new x-ray light sources, including XHV vacuum properties, robust HV insulators, stable supplies, electrode materials preparation reduce dark current, conditioning. In this...
As part of the "CESR-c" upgrade project, a full-scale prototype superferric wiggler module has been installed into Cornell Electron Storage Ring (CESR) and successfully operated since October 2002. At least eleven more wigglers are to be enable full operation CESR-c. The magnets chosen achieve necessary damping for optimum CESR-c at beam energy 1.88 GeV. cryostat units designed modular, fixed length flange-to-flange, so that they can easily exchanged. incorporates several novel features...
Superconducting wiggler magnets for operation of the CESR electron-storage ring at energies as low 1.5 GeV have been designed, built and installed in years 2000 to 2004. Finite-element models field quality developed various sources errors investigated compared measurements. Minimization algorithms providing accurate analytic representations fields established. We present quantitative descriptions modeling, measured accuracy achieved functions field.