A5054279106- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Magnetic confinement fusion research
- Advanced Radiotherapy Techniques
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Optical Systems and Laser Technology
- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Breast Cancer Treatment Studies
- Advanced X-ray Imaging Techniques
- Advancements in Photolithography Techniques
- Dark Matter and Cosmic Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Dose and Imaging
- Pulsed Power Technology Applications
- Integrated Circuits and Semiconductor Failure Analysis
SLAC National Accelerator Laboratory
2013-2024
University of California, San Diego
1975-2024
Stanford University
2007-2023
Menlo School
2007-2023
Logikos (United States)
2023
Stanford Synchrotron Radiation Lightsource
2002-2022
Sandia National Laboratories California
2021
Stony Brook University
2019
PureTech (United States)
2018
University of California, Los Angeles
2017
We demonstrate the experimental feasibility of probing fully nonperturbative regime quantum electrodynamics with a 100 GeV-class particle collider. By using tightly compressed and focused electron beams, beamstrahlung radiation losses can be mitigated, allowing particles to experience extreme electromagnetic fields. Three-dimensional particle-in-cell simulations confirm viability this approach. The forefront envisaged has potential establish novel research field stimulate development new...
The National User Facility for Advanced Accelerator Experimental Tests II (FACET-II) at SLAC Laboratory expands upon the experiments conducted FACET. Its purpose is to build decades-long experience developed conducting accelerator R in areas of advanced acceleration and coherent radiation techniques with high-energy electron positron beams. This paper summarizes motivations design resulting capabilities FACET-II facility.
Abstract The number and weight distribution functions, the average chain lengths, inhomogeneities of an initially homogeneous polymer sample have been calculated assuming a mechanism likely to be encountered during ultrasonic degradation long‐chain molecules. evaluation experimental results on basis this has indicated Schmid's theory briefly discussed.
We report on the application of machine learning (ML) methods for predicting longitudinal phase space (LPS) distribution particle accelerators. Our approach consists training a ML-based virtual diagnostic to predict LPS using only nondestructive linac and e-beam measurements as inputs. validate this with simulation study FACET-II an experimental demonstration conducted at LCLS. At LCLS, images are obtained transverse deflecting cavity used data our ML model. In both LCLS cases we find good...
During the past two decades of research, ultra-relativistic beam-driven plasma wakefield accelerator (PWFA) concept has achieved many significant milestones. These include demonstration ultra-high gradient acceleration electrons over meter-scale structures, efficient a narrow energy spread electron bunch at high-gradients, positron using wakes in uniform plasmas and hollow channels, demonstrating that highly nonlinear 'blow-out regime' have electric field structure necessary for preserving...
Abstract The experimental variation of rate constant with chain length in the degradation fractionated polystyrene samples by ultrasonic waves has been determined. results are discussed relation to a theory previously presented account for molecular distributions obtained during degradation. It is shown that cannot be explained satisfactorily theories which assume caused frictional or impact forces.
We present a proposal for cold copper distributed coupling accelerator that can provide rapid route to precision Higgs physics with compact 8 km footprint. This is based on recent advances increase the efficiency and operating gradient of normal conducting accelerator. technology also provides an $e^{+}e^{-}$ collider path at multi-TeV energies. In this article, we describe our vision near-term R&D program needed pursue it.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text S. A. Collins and G. R. White, "Interferometer Laser Mode Selector," Appl. Opt. 2, 448_1-449 (1963) Export BibTex Endnote (RIS) HTML Plain alert Save article
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
The scientific community is currently witnessing an expensive and worldwide race to achieve the highest possible light intensity. Within next decade this effort expected reach nearly $10^{24}\,\mathrm{W}/\mathrm{cm^2}$ in lab frame by focusing of 100 PW, near-infrared lasers. A major driving force behind possibility study strong-field vacuum breakdown accompanying electron-positron pair plasma via a quantum electrodynamic (QED) cascade [Edwin Cartlidge, "The fantastic", Science 359, 382...
Plasma accelerators can generate ultra high brightness electron beams which open the door to light sources with smaller physical footprint and properties un-achievable conventional accelerator technology. In this paper we show that from WakeField Accelerators (PWFAs) few-cycle coherent tunable soft X-ray pulses TW peak power a duration of tens attoseconds, an order magnitude more powerful, shorter better stability than state-of-the-art Free Electron Lasers (XFELs). Such source would...
Abstract The degradation by ultrasonic waves of a homogeneous polystyrene sample has been studied. does not proceed to the monomer but ceases at definite intermediate chain length. A rate constant derived. experimental size distributions polymer various stages have determined and compared with derived from theory degradation. Satisfactory agreement found between experiment for main features
Abstract High repetition rates and efficient energy transfer to the accelerating beam are important for a future linear collider based on beam-driven plasma wakefield acceleration scheme (PWFA-LC). This paper reports first results from Plasma Wakefield Acceleration Collaboration (E300) that beginning address both of these issues using recently commissioned FACET-II facility at SLAC national accelerator laboratory. We have generated meter-scale hydrogen plasmas time-structured 10 GeV electron...
Plasma wakefield acceleration provides ultrahigh gradients of tens GeV/m, providing a novel path toward efficient, compact, TeV-scale linear colliders, and high brightness free electron lasers. Critical to the success these applications is demonstrating simultaneously gradient acceleration, energy transfer efficiency, preservation emittance, charge, spread. Experiments at FACET-II National User Facility SLAC Accelerator Laboratory aim achieve all milestones in single-stage plasma...
The objective was to compare intensity‐modulated radiation therapy (IMRT) with 3D conformal proton (3DCPT) in the treatment of cervical cancer. In particular, each technique's ability spare pelvic bone marrow (PBM) primary interest this study. A total six cancer patients (3 postoperative and 3 intact) were planned analyzed. All plans had uniform 1.0 cm CTV‐PTV margin satisfied 95% PTV 100% isodose (prescription ) coverage. Dose‐volume histograms (DVH) analyzed for comparison. overall PBM...
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
Abstract The dependence of the rate constant on concentration in degradation by ultrasonic waves polystyrene benzene has been determined. At fairly high intensities overall increases with decreasing but appears to tend a maximum. This maximum located at reduced intensity for particular sample and it is shown occur when chains are highly entangled.
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...
Abstract C 3 is an opportunity to realize e + - collider for the study of Higgs boson at √ s = 250 GeV, with a well defined upgrade path 550 GeV while staying on same short facility footprint [2,3]. based fundamentally new approach normal conducting linear accelerators that achieves both high gradient and efficiency relatively low cost. Given advanced state designs, key system requires technical maturation main linac. This paper presents staged towards demonstrate technology Direct (source...
The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the resolution cavity position monitor (BPM) system, which part ATF2 diagnostics. Two types BPMs are used, C-band operating at 6.423 GHz, and S-band 2.888 GHz with an increased aperture. cavities, electronics, digital processing described. attenuators was determined to be approximately 250 nm 1 m system. Without attenuation best recorded 27 nm.
C$^3$ is an opportunity to realize e$^+$e$^-$ collider for the study of Higgs boson at $\sqrt{s} = 250$ GeV, with a well defined upgrade path 550 GeV while staying on same short facility footprint. based fundamentally new approach normal conducting linear accelerators that achieves both high gradient and efficiency relatively low cost. Given advanced state designs, key system requires technical maturation main linac. This white paper presents staged towards demonstrate technology Direct...
The detailed response of an Si(Li) detector to the manganese K x-rays from a 55Fe source was studied by least-squares fitting various spectrum models using generalized variant GUPIX code. peak-to-background ratio (>106) observed for Kα is superior in used here that crystal spectrometer, and very large intensities are recorded. In addition well recognized effects such as intrinsic Lorentzian distribution x-ray line approximately Gaussian function, Kβ peak shapes influenced multiplet...
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.