Abstract：
:Attosecond (asec) X-ray free-electron laser (XFEL) has attracted considerable interest over the past years. Nowadays typical XFEL application experiments demand 1010-1011 photons per pulse, which corresponds to a peak power of terawatts (TW) in case of asec hard X-ray pulse. To the realization of such TW asec-XFEL pulse, however, the unavoidable increase of slice energy spread (SES) due to laser heater, which is commonly used to mitigate the micro-bunching instability (MBI), would be a major obstacle. To deal with this problem, the effect of such a SES is investigated in this work. The results reveal that (1) SES of a current spike is linearly proportional to the peak current of a current spike in an electron beam, (2) surprisingly, this linearity is independent of the wavelength of an energy modulation driving laser which is used to make a current spike and (3) the gain length of current spike in the undulator is sensitive to the initial SES, so there is an optimal peak current of the current spike for successful FEL lasing process. Utilizing these characteristics, a series of simulations with parameters for Pohang Accelerator Laboratory X-ray Free Electron Laser was carried out to demonstrate that an isolated, TW asec-XFEL pulse can be generated even when the SES is increased due to the usage of laser heater to prevent the MBI in the XFEL. We show that an isolated X-ray pulse with >1 TW and a pulse duration of 73 as (~3 × 1010 photons/pulse at 12.4 keV or 0.1 nm) can be generated by using ten current spikes with optimal peak current. It becomes clear for the first time that the disadvantage from the increased SES can be indeed overcome.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Shim CH,Parc YW,Kim DEdoi
10.1038/s41598-020-57905-ysubject
Has Abstractpub_date
2020-01-28 00:00:00pages
1312issue
1issn
2045-2322pii
10.1038/s41598-020-57905-yjournal_volume
10pub_type
杂志文章abstract：:Amyotrophic lateral sclerosis (ALS) is an incurable and fatal neurodegenerative disease. Increasing the chances of success for future clinical strategies requires more in-depth knowledge of the molecular basis underlying disease heterogeneity. We recently laid the foundation for a molecular taxonomy of ALS by whole-ge...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-019-46355-w
更新日期：2019-07-10 00:00:00
abstract：:Carbon coated TiO2 (TiO2@C) is fabricated by a convenient and green one-pot solvothermal method, in which ethylene glycol serve as both the reaction medium and carbon source without the addition of any other carbon additives. During the solvothermal process, ethylene glycol polymerize and coordinate with Ti4+ to form ...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep43895
更新日期：2017-03-03 00:00:00
abstract：:We identify a new instability in electrostatic actuators dubbed quasi-static pull-in. We report experimental evidence of the instability and study its characteristics in two types of micro actuators operating in ambient air. We found that the underlying mechanism is a fast-slow dynamic interaction between slowly-varyi...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-020-61534-w
更新日期：2020-03-19 00:00:00
abstract：:Present study, for the first time, reports the development of a nanohybridized baculovirus based stent that can locally promote vascular re-endothelialization by efficient delivery of pro-angiogenic vascular endothelial growth factor (Vegf) genes. In vitro data demonstrated rapid expression of functionally active Vegf...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep02366
更新日期：2013-01-01 00:00:00
abstract：:Accumulating evidence suggests that the gut microbiota dysbiosis and their host metabolic phenotype alteration is an important factor in human disease development. A traditional Chinese herbal formula, Chaihu-Shu-Gan-San (CSGS), has been effectively used in the treatment of various gastrointestinal (GI) disorders. The...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep46551
更新日期：2017-04-20 00:00:00
abstract：:VCF2CNA is a tool (Linux commandline or web-interface) for copy-number alteration (CNA) analysis and tumor purity estimation of paired tumor-normal VCF variant file formats. It operates on whole genome and whole exome datasets. To benchmark its performance, we applied it to 46 adult glioblastoma and 146 pediatric neur...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-019-45938-x
更新日期：2019-07-17 00:00:00
abstract：:This paper reports the fabrication and operation of a transmission-type polarization rotator for visible light with a wavelength of 450 nm using indirect-transition-type semiconductor crystalline SiC in which Al atoms were implanted as a p-type dopant. A novel dressed-photon-phonon (DPP)-assisted annealing method was ...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-020-69971-3
更新日期：2020-07-31 00:00:00
abstract：:Most male lepidopterans produce fertile eupyrene sperm and non-fertile apyrene sperm, both of which are transferred to the female in a spermatophore during mating. Apyrene sperm outnumbers eupyrene sperm and both sperm types migrate from the bursa copulatrix to the spermatheca after mating. While eupyrene sperm are ma...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-020-77683-x
更新日期：2020-12-01 00:00:00
abstract：:With about 350 million people chronically infected around the world hepatitis B is a major health problem. Template for progeny HBV synthesis is the viral genome, organized as a minichromosome (cccDNA) inside the hepatocyte nucleus. How viral cccDNA gene expression is regulated by its chromatin structure; more importa...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep25901
更新日期：2016-05-13 00:00:00
abstract：:The negatively-charged nitrogen vacancy (NV(-)) center in diamond is of great interest for quantum information processing and quantum key distribution applications due to its highly desirable long coherence times at room temperature. One of the challenges for their use in these applications involves the requirement to...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep11179
更新日期：2015-06-25 00:00:00
abstract：:Reconstructed annual streamflows using tree-ring chronologies provide useful information on moisture availability during the pre-historic period, but they have limitations in estimating high flows due to the upper bound on soil water holding capacity and trees' metabolic growth limits. We propose a hybrid approach tha...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-018-23294-6
更新日期：2018-03-21 00:00:00
abstract：:Pyrochar (PC) is always with high pH value, and improper application might increase rice paddy ammonia volatilization (PAV), which is the main nitrogen loss through air during rice production. Differently, hydrochar (HC) takes the advantages of high productive rate and always with lower pH value compared with PC. Howe...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-020-76213-z
更新日期：2020-11-05 00:00:00
abstract：:The reflected microwave power from the photo-excited high mobility GaAs/AlGaAs 2D device has been measured over the wide frequency band spanning from 30 to 330 GHz simultaneously along with diagonal magnetoresistance as a function of the magnetic field. Easily distinguishable resonances in the reflected power signal a...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-019-39186-2
更新日期：2019-02-20 00:00:00
abstract：:Calcium ion is an intracellular messenger that plays a central role in signal transduction pathways. Calcineurin B-like proteins (CBLs) and CBL-interacting protein kinases (CIPKs) signal network have shown different functions in the Ca(2+) signaling process. In this work, we identified the entire soybean (Glycine max)...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep28225
更新日期：2016-06-17 00:00:00
abstract：:Agricultural land is typically managed based on visible plant life at the expense of the belowground majority. However, microorganisms mediate processes sustaining plant life and the soil environment. To understand the role of microbes we first must understand what controls soil microbial community assembly. We assess...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep45369
更新日期：2017-03-28 00:00:00
abstract：:Fasciolosis is common in UK beef cattle, but it is unclear at what levels liver fluke burdens cause production losses. This study aimed to address these uncertainties by estimating the impact of liver fluke infection on UK beef cattle productivity and investigating the use of diagnostic tests in a quantitative manner....
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-017-07396-1
更新日期：2017-08-04 00:00:00
abstract：:Amniotic membrane (AM) has been widely used as a temporary or permanent graft in the treatment of various ocular surface diseases. In this study, we compared the epithelial wound healing and tissue remodeling after ocular surface reconstruction with intact amniotic membrane (iAM) or denuded amniotic membrane (dAM). Pa...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-018-24694-4
更新日期：2018-04-23 00:00:00
abstract：:This study investigated the variation characteristics of micro-topography during successive erosive stages of water erosion: splash erosion (SpE), sheet erosion (ShE), and rill erosion (RE). Micro-topography was quantified using surface elevation change, soil roughness (SR) and multifractal model. Results showed that ...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-018-21852-6
更新日期：2018-02-22 00:00:00
abstract：:The major source of ATP in cancer cells remains unclear. Here, we examined energy metabolism in gastric cancer cells and found increased fatty acid oxidation and increased expression of ALDH3A1. Metabolic analysis showed that lipid peroxidation by reactive oxygen species led to spontaneous production of 4-hydroxynonen...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-019-52814-1
更新日期：2019-11-08 00:00:00
abstract：:Brain-computer interfaces enable active communication and execution of a pre-defined set of commands, such as typing a letter or moving a cursor. However, they have thus far not been able to infer more complex intentions or adapt more complex output based on brain signals. Here, we present neuroadaptive generative mod...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-020-71287-1
更新日期：2020-09-07 00:00:00
abstract：:In this article, we describe the electro-hydrodynamics of non-Newtonian fluid in narrow fluidic channel with solvent permeable and ion-penetrable polyelectrolyte layer (PEL) grafted on channel surface with an interaction of non-overlapping electric double layer (EDL) phenomenon. In this analysis, we integrate power-la...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-018-26056-6
更新日期：2018-05-18 00:00:00
abstract：:Controlled surface wettability for oil has been intensively studied to remove industrial oil waste or oil spill pollution from seas or rivers. In particular, external stimuli-induced special wetting materials, such as photo-responsive TiO2, have attracted considerable attention for oil-water separation. In this study,...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep12908
更新日期：2015-08-11 00:00:00
abstract：:The metal-air battery is a form of renewable energy generation technology that produces energy electrochemically and can address energy concerns in the near future. However, state-of-the-art Pt electrocatalysts often suffer from agglomeration or detachment from carbon supports under prolonged operation, eventually lim...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-019-49194-x
更新日期：2019-09-03 00:00:00
abstract：:Short-range interaction can give rise to particle pairing with a short-range correlation, which may be destroyed in the presence of an external field. We study the transition between correlated and uncorrelated particle states in the framework of one- dimensional Hubbard model driven by a field. We show that the long ...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep27189
更新日期：2016-06-02 00:00:00
abstract：:Bacillus anthracis, Bacillus cereus, and Bacillus thuringiensis (Bt) are spore-forming members of the Bacillus cereus group. Spores of B. cereus group species are encircled by exosporium, which is composed of an external hair-like nap and a paracrystalline basal layer. Despite the extensive studies on the structure of...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep19005
更新日期：2016-01-25 00:00:00
abstract：:We developed a solvothermal-induced self-assembly approach to construct three dimensional (3D) macroscopic Fe2O3 nanocubes/nitrogen-doped graphene (Fe2O3-NC/GN) aerogel as anode materials for lithium-ion batteries (LIBs). The Fe2O3 nanocubes with length of ~50 nm are homogeneously anchored on 3D GN frameworks and as s...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/srep07171
更新日期：2014-11-25 00:00:00
abstract：:A novel turn-off colorimetric sensor for sequence-specific recognition of single-stranded DNA (ssDNA) was established by combining Y-shaped DNA duplex and G-quadruplex-hemin DNAzyme. A G-rich single-stranded DNA (Oligo-1) displays peroxidase mimicking catalytic activity due to the specific binding with hemin in the pr...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-018-30529-z
更新日期：2018-08-13 00:00:00
abstract：:A high-resolution genetic map is a useful tool for assaying genomic structural variation and clarifying the evolution of polyploid cotton. A total of 36956 SSRs, including 11289 released in previous studies and 25567 which were newly developed based on the genome sequences of G. arboreum and G. raimondii, were utilize...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-017-08006-w
更新日期：2017-08-09 00:00:00
abstract：:Adipocytes play a central role in maintaining metabolic homeostasis in the body. Differentiation of adipocyte precursor cells requires the transcriptional activity of peroxisome proliferator-activated receptor-γ (Pparγ) and CCAAT/enhancer binding proteins (C/Ebps). Transcriptional activity is regulated by signaling mo...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-017-07497-x
更新日期：2017-08-03 00:00:00
abstract：:Staphylococcus aureus is a medically important pathogen with an abundance of virulence factors that are necessary for survival within a host, including the production of cytolytic toxins. The regulation of toxin production is mediated by the Agr quorum sensing system, and a poorly defined post-exponential growth phase...
journal_title：Scientific reports
pub_type： 杂志文章
doi：10.1038/s41598-017-14110-8
更新日期：2017-10-23 00:00:00
