A5101548835- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Superconducting Materials and Applications
- Laser Design and Applications
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Nuclear reactor physics and engineering
- Silicon Carbide Semiconductor Technologies
- Fungal Biology and Applications
- Plasma Diagnostics and Applications
- Advanced Surface Polishing Techniques
- Advanced DC-DC Converters
- Crystallography and Radiation Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear Materials and Properties
- Advancements in Photolithography Techniques
- Advanced Electron Microscopy Techniques and Applications
- Sugarcane Cultivation and Processing
- Laser-induced spectroscopy and plasma
- Heat Transfer and Optimization
Lanzhou Institute of Chemical Physics
2025
Chinese Academy of Sciences
1999-2025
Chongqing University
2025
Stanford University
2007-2024
China Electric Power Research Institute
2023-2024
SLAC National Accelerator Laboratory
2012-2024
University of California, Los Angeles
2002-2024
Shenzhen Metro (China)
2024
University College Dublin
2024
Xidian University
2024
A possible design of a multi-TeV e+e- linear collider is presented. The based on the CLIC (Compact Linear Collider) two-beam technology proposed and developed at CERN. Though study has shown that this applicable to with centre-of-mass energies from 500 GeV or less up 5 TeV, present report focuses nominal energy 3 Te V. First, short overview given physics could possibly be done such collider. Then, description main-beam complex covers injection system, 30 GHz main linac, beam delivery system....
We report the first measurements of x-ray single-pulse duration and two-pulse separation at Linac Coherent Light Source using a cross-correlation technique involving x rays electrons. An emittance-spoiling foil is adopted as very simple effective method to control output pulse. A minimum pulse about 3 fs full width half maximum has been measured together with controllable (delay) between two pulses. This provides critical temporal diagnostics for experiments such pump-probe studies.
The microbunching instability (MBI) is a well-known problem for high brightness electron beams and has been observed at accelerator facilities around the world. Free-electron lasers (FELs) are particularly susceptible to MBI, which can distort longitudinal phase space increase beam's slice energy spread (SES). Past studies of MBI Linac Coherent Light Source (LCLS) relied on optical transition radiation infer existence microbunching. With development x-band transverse deflecting cavity...
It is widely believed that a drive laser with uniform temporal and spatial profiles required to generate the lowest emittance beam at photoinjector. However, for given 3 ps smooth-Gaussian profile, our recent simulations indicate truncated-Gaussian profile produces an electron smaller emittance. The simulation results are qualitatively confirmed by later analytical calculation, also measurements: reduction of $\ensuremath{\sim}25%$ was observed linac coherent light source (LCLS) injector...
A new operating mode has been developed for the Linac Coherent Light Source (LCLS) in which we shape longitudinal phase space of electron beam. This operation is realized using a horizontal collimator located middle first bunch compressor to truncate head and tail With this method, beam current profile are reshaped, improvement lasing performance can be realized. We present experimental studies at LCLS shaping effects on free-electron laser performance.
The shot-noise driven microbunching instability can significantly degrade electron beam quality in x-ray free laser light sources. Experiments were carried out at the Linac Coherent Light Source (LCLS) to study this instability. In paper, we present start-to-end simulations of experiment LCLS using real number electrons. simulation results reproduce measurements quite well. A self-heating mechanism is also illustrated simulation, which helps explain experimental observation.
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For the Linac Coherent Light Source II (LCLS-II) project at SLAC, a 1.3 GHz superconducting rf (SRF) linac is being constructed that will generate 4 GeV electron bunches high repetition rate to drive x-ray free lasers. The LCLS-II source, which comprises first three meters of injector, includes two normal-conducting, continuous-wave cavities: one-cell, 185.7 MHz gun and two-cell, buncher. It also load-lock system allows photocathodes be changed under vacuum. components in this beam-line...
Laser-driven electron accelerators (laser linacs) offer the potential for enabling much more economical and compact devices. However, development of practical efficient laser linacs requires accelerating a large ensemble electrons together ("trapping") while keeping their energy spread small. This has never been realized before any acceleration system. We present here first demonstration high-trapping efficiency narrow via acceleration. Trapping efficiencies up to 80% spreads down 0.36% (1...
We propose a novel design method for circularly symmetric phase mask to extend the depth of focus. Using free-form rational function as solution space, we optimize profile by analysis axial intensity distribution, which can be calculated efficiently employing fast Fourier transform algorithm. Numerical comparisons prove resulting mask's superiority existing quartic in distribution and imaging performance.
Small, stray magnetic and RF fields in electron guns injectors can perturb an beam introduce correlations between the otherwise orthogonal transverse trajectories. These couple x y dynamics which increases emittance. If correlation becomes "diluted" or randomized transport then as disappears 4D emittance increases. This paper discusses two important common to most injectors. The first results from coupling of a weak quadrupole field with rotation solenoid, second x-y is generated by...
The very-high-frequency gun (VHF-Gun) is a new concept photo-injector developed and built at the Lawrence Berkeley National Laboratory (LBNL) for generating high-brightness electron beams capable of driving X-ray free lasers (FELs) MHz-class repetition rates. that purposely uses established mature radiofrequency mechanical technologies has demonstrated over last many years capability reliably operating in continuous wave mode design accelerating fields required vacuum performance. results...
This article is focused on the thermal design and three-dimensional (3-D) package optimization of planar magnetic components (PMCs), including transformers inductors for application in an electric vehicle composite boost dc-dc converter. Each PMC comprises electrical windings printed circuit board (PCB) form combination with a ferrite core. Multiple features each are thermally optimized proposed device configurations given core size, loss distribution, number turns PCB winding, winding...
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
Laser-based techniques have been widely used for cleaning metal photocathodes to increase quantum efficiency (QE). However, the impact of laser on cathode uniformity and thereby electron beam quality are less understood. We evaluating whether this technique can be applied revive high-brightness sources in advanced x-ray free-electron (FEL) facilities, such as Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory. The laser-based was two separate areas current LCLS...
Abstract Cloud manufacturing is emerging as a new paradigm and an integrated technology. To adapt to the increasing challenges of traditional industry transforming toward service-oriented innovative manufacturing, this paper proposes product platform architecture based on cloud manufacturing. Firstly, framework for was built. The proposed composed five layers: resource, technology, service, application, user layers. Then, several key enabling technologies forming were studied. Finally, built...
This article is focused on modeling and design optimization of high-current-ripple planar inductors in liquid-cooled high-power applications, such as electric-vehicle drivetrain systems, where efficiency power density are the key performance metrics. The planar-inductor facilitated by innovations computationally efficient accurate models ac winding loss thermal management. A novel approximate analytical model for takes into account effects inside-the-core versus outside-the-core geometry...
Electron bunches of high charge (up to 10 nC) are compressed in length the Compact Linear Collider Test Facility magnetic chicane less than 0.4 mm rms. The short radiate coherently field, and horizontal longitudinal phase space density distributions affected. This paper reports results beam emittance momentum measurements. Horizontal vertical emittances spectra were measured for different bunch compression factors charges. In particular, nC bunches, mean decreased by about 5% while rms...
We propose a novel phase mask called the rational (RPM) to extend depth of field in optical-digital hybrid imaging systems. Using invariance defocus modulation transfer function as merit function, we adopt simulated annealing algorithm optimize RPM together with other three existing masks. Numerical comparisons prove RPM's superiority.