A5054955512- 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
- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Electromagnetic Simulation and Numerical Methods
- Photocathodes and Microchannel Plates
- Distributed and Parallel Computing Systems
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- International Science and Diplomacy
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Data Storage Technologies
- Dark Matter and Cosmic Phenomena
- Graphite, nuclear technology, radiation studies
- Laser Design and Applications
- Experimental Learning in Engineering
- Pulsed Power Technology Applications
- Atomic and Molecular Physics
SLAC National Accelerator Laboratory
2016-2025
Fermi National Accelerator Laboratory
2015-2024
Brookhaven National Laboratory
2002-2022
Lawrence Berkeley National Laboratory
1997-2022
European Organization for Nuclear Research
1996-2022
Stony Brook University
2022
University of California, Irvine
2022
Université Paris-Saclay
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
CEA Paris-Saclay
2022
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....
The effect of an artificially enhanced rough surface on the secondary electron yield (SEY) was investigated both theoretically and experimentally. Analytical studies triangular rectangular grooved surfaces show connection between characteristic parameters a given geometry to SEY reduction. strong magnetic field is also discussed. samples have been measured results agree with particle simulations using Monte Carlo approach.
We report the first experimental demonstration of echo-enabled harmonic generation technique, which holds great promise for high-power, fully coherent short-wavelength radiation. In this experiment, radiation at 3rd and 4th harmonics second seed laser is generated from so-called beam echo effect. The experiment confirms physics behind technique paves way applying seeded x-ray free electron lasers.
FACET—Facilities for Accelerator science and Experimental Test beams at SLAC—will provide high-energy-density electron positron with peak currents of roughly 20 kA that will be focused down to a 10 μm×10 μm transverse spot size an energy ∼23 GeV. With FACET, the SLAC linac support unique program concentrating on second-generation research in plasma wakefield acceleration. Topics include high-gradient acceleration narrow spread preserved emittance, beam loading This paper describes FACET...
Abstract Colliders are essential research tools for particle physics. Numerous future collider proposal were discussed in the course of US high energy physics community strategic planning exercise Snowmass'21 . The Implementation Task Force (ITF) has been established to evaluate proposed accelerator projects performance, technology readiness, schedule, cost, and environmental impact. Corresponding metrics developed uniform comparison proposals ranging from Higgs/EW factories multi-TeV...
Echo-enabled harmonic generation free electron lasers hold great promise for the of fully coherent radiation in x-ray wavelengths. Here we report first evidence high harmonics from echo-enabled technique realistic scenario where laser energy modulation is comparable to beam slice spread. In this experiment, at seventh second seed generated when amplitude about 2-3 times The experiment confirms underlying physics and may have a strong impact on emerging seeded that are capable generating...
Electron beam quality is paramount for X-ray pulse production in free-electron-lasers (FELs). State-of-the-art linear accelerators (linacs) can deliver multi-GeV electron beams with sufficient hard X-ray-FELs, albeit requiring km-scale setups, whereas plasma-based produce on metre-scale distances, and begin to reach qualities EUV FELs. Here we show, that from plasma photocathodes many orders of magnitude brighter than state-of-the-art be generated wakefield (PWFAs), then extracted, captured,...
The interaction of an electron beam with residual gas ions results in mutually driven transverse oscillations. This effect arises during the passage a single train bunches. An equivalent instability mechanism is encountered positron beams where ionization electrons oscillate within bunch. In either case, oscillations grow exponentially exponent proportional to ${\mathit{t}}^{1/2}$. this report, rise time calculated analytically by perturbation series approach and compared computer...
In recent years significant studies have been initiated on the feasibility of utilizing a portion 3 km S-band accelerator at SLAC to drive short wavelength (4.5−1.5 Å) Linac Coherent Light Source (LCLS), Free-Electron Laser (FEL) operating in Self-Amplified Spontaneous Emission (SASE) regime. Electron beam requirements for single-pass saturation minimal time include: 1) peak current 7 kA range, 2) relative energy spread <0.05%, and 3) transverse emittance, ε [rad-m], approximating...
In this paper, we describe a new trajectory correction technique for high energy linear accelerators. Current techniques force the beam to follow misalignments of position monitors (BPMs). Since particle bunch has finite spread and particles with different energies are deflected differently, causes "chromatic" dilution transverse emittance. The algorithm which in paper reduces chromatic by minimizing dependence trajectory. To test method compare effectiveness our standard simulations...
X-ray free-electron lasers are enabling access to new science by producing ultrafast and intense x rays that give researchers unparalleled power precision in examining the fundamental nature of matter. In quest for fully coherent rays, echo-enabled harmonic generation technique is one most promising methods. this technique, radiation at high frequencies two seed generated from recoherence electron beam phase space memory. Here we report on highly stable vacuum ultraviolet 15th an infrared...
We present an x-ray regenerative amplifier free-electron laser design capable of producing fully coherent hard pulses across a broad tuning range at high steady state repetition rate. The scheme leverages strong undulator taper and apertured diamond output-coupling cavity crystal to produce both peak average spectral brightness radiation that is 2 3 orders magnitude greater than conventional single-pass self-amplified spontaneous emission amplifiers. Refractive guiding in the postsaturation...
This is the full high-level report of Snowmass 2021, most recent U.S. High Energy Physics (HEP) Community Planning Exercises, sponsored by Division Particles and Fields (DPF) American Physical Society (APS), with strong consultation from aligned APS Divisions Nuclear Physics, Astrophysics, Gravitational Beams. The goal these community studies, first which was in 1982, has been to identify important scientific questions HEP for following decade, an eye decade after that, facilities,...
Talman [Phys. Rev. Lett. 56, 1429 (1986)] has proposed a novel relativistic effect that occurs when charged particle beam is bent in the magnetic field from an external dipole. The consequence of this space-charge forces particles do not exhibit usual inverse-square energy dependence and some part them are, fact, independent energy. This led to speculation could introduce significant emittance growth for bending electron beam. Subsequently, it was shown effect's influence on beam's...
This Resource Book reviews the physics opportunities of a next-generation e+e- linear collider and discusses options for experimental program. Part 1 contains table contents introduction gives summary case 500 GeV collider.
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.
We report the results of observations a new regime ion instabilities at Advanced Light Source (ALS). With artificially increased pressure and gaps in bunch train large enough to avoid multiturn trapping, we observed factor 2--3 increase vertical beam size along with coherent oscillations which train. The are qualitatively consistent ``fast beam-ion instability'' [T. O. Raubenheimer F. Zimmermann, Phys. Rev. E 52, 5487 (1995); G. V. Stupakov et al., 5499 (1995)], can arise even when ions not...
We report generation of density modulation at terahertz (THz) frequencies in a relativistic electron beam through laser the longitudinal phase space. show that by modulating energy distribution with two lasers, difference frequency lasers can be generated after passes chicane. In this experiment, around 10 THz was down-converting an 800 nm and 1550 laser. The central tuned varying wavelengths, chirp, or momentum compaction This technique applied to accelerator-based light sources for...
We describe the experimental generation and measurement of coherent light that carries orbital angular momentum from a relativistic electron beam radiating at second harmonic helical undulator. The measured phase is shown to be in agreement with predictions sign magnitude singularity more than 2 orders greater incoherent signal. Our setup demonstrates such optical vortices can produced modern free-electron lasers simple afterburner arrangement for novel two-mode pump-probe experiments.
Abstract As part of the Snowmass'21 community planning excercise, Advanced Accelerator Concepts (AAC) proposed future linear colliders with center-of-mass energies up to 15 TeV and luminosities 50 × 10 34 cm -2 s -1 in a compact footprint. In addition being compact, these machines must also be energy efficient. We identify two challenges that addressed design machines. First, Beam Delivery System (BDS) not add significant length accelerator complex. Second, beam parameters chosen mitigate...