搜索结果: 1-15 共查到“知识库 物理学 X-ray”相关记录90条 . 查询时间(0.093 秒)
A Neural Network based Background Supression Technique applied to VHE Gamma Ray Data coming from the Crab Pulsar
Imaging Atmospheric Cherenkov Technique Flux Upper Limit
2014/12/12
In this thesis we present new results for the 99.9% confidence level flux upper limits on the pulsed VHE gamma ray signal coming from the Crab pulsar. In order to achieve optimum hadronic background s...
Harmonic lasing in a free electron laser with a planar undulator (under the condition that the fundamental frequency is suppressed) might be a cheap and efficient way of extension of wavelength ranges...
Multi bunch GMMA Ray generation experiment at ATF
Multi bunch GMMA Ray generation experiment ATF Instrumentation and Detectors
2012/5/29
We construct a new detector to monitor $\gamma$ yields in bunch by bunch basis for the Laser Compton experiment at the KEK ATF which is capable to separate $\gamma$ rays in 5.6ns-spacing multi-bunch o...
Towards hard X-ray imaging at GHz frame rate
hard X-ray imaging GHz frame rate Instrumentation and Detectors Plasma Physics
2012/5/17
Gigahertz (GHz) imaging using hard X-rays ($\gtrsim$ 10 keV) can be useful to high-temperature plasma experiments, as well as research using coherent photons from synchrotron radiation and X-ray free ...
Can Sequentially Linked Gamma-Ray Bursts Nullify Randomness?
Gamma-Ray Bursts Nullify Randomness General Physics
2012/5/17
In order to nullify the property of randomness perceived in the dispersion of gamma-ray bursts (GRB's) we introduce two new procedures. 1. Create a segmented group of sequentially linked GRB's and qua...
Self-seeding scheme for the soft X-ray line at the European XFEL
Self-seeding scheme soft X-ray line the European XFEL
2012/2/28
This paper discusses the potential for enhancing the capabilities of the European FEL in the soft X-ray regime. A high longitudinal coherence will be the key to such performance upgrade. In order to r...
Walther Bothe and Bruno Rossi: the birth and development of coincidence methods in cosmic-ray physics
Walther Bothe and Bruno Rossi cosmic-ray physics
2011/8/31
In 1924 Walther Bothe and Hans Geiger applied a coincidence method to the study of Compton scattering with Geiger needle counters. Their experiment con rmed the existence of radiation quanta and estab...
An X-Ray Free Electron Laser Oscillator with Intermediate Energy Electron Beam
X-Ray Free Electron Laser Oscillator Intermediate Energy Electron Beam
2011/8/4
Abstract: Harmonic lasing of low-gain free electron laser oscillator has been experimentally demonstrated in terahertz and infrared region. Recently, together with the high-reflectivity high-resolutio...
Fourier transform based iterative method for x-ray differential phase-contrast computed tomography
X-ray phase-contrast tomography, x-ray refractive index, iterative reconstruction,interior tomography
2011/9/6
Biological soft tissues encountered in clinical and pre-clinical imaging mainly consist of light element atoms, and their composition is nearly uniform with little density variation. Thus,x-ray attenu...
X-ray polarization: General formalism and polarization analysis
X-rays { Polarization { Magnetic scattering { Resonant scattering
2011/9/15
The polarization of x-rays plays an outstanding role in experimental techniques such as non-resonant magnetic x-ray scattering and resonant x-ray scattering of magnetic and multipolar order. Di erent ...
Single shot phase contrast imaging using laser-produced Betatron x-ray beams
Betatron x-ray beams
2011/9/5
Development of x-ray phase contrast imaging applications with a laboratory scale source have been limited by the long exposure time needed to obtain one image. We demonstrate, using the Betatron x-ray...
Comparison of hard x-ray production from various targets in air using a short pulse kHz laser with photon production from a high power multifilament laser beam from the same targets in air
multifilament short pulse kHz laser
2011/9/5
Over the last few years there has been much interest in the production of hard X-rays from various targets using a kHz short pulse laser at intensities above 1014Wcm-2 (A). Most of these studies have ...
Controlled Betatron X-ray radiation from tunable optically injected electrons
Betatron X-ray radiation tunable optically injected electrons
2011/9/5
The features of Betatron X-ray emission produced in a laser-plasma accelerator are closely linked to the properties of the relativistic electrons which are at the origin of the radiation. While in int...
Fe XVII X-ray Line Ratios for Accurate Astrophysical Plasma Diagnostics
atomic data atomic processes line: formation opacity plasmas X-rays:general.
2011/9/14
New laboratory measurements using an Electron Beam Ion Trap (EBIT) and an x-ray microcalorimeter are presented for the n=3 to n=2 Fe XVII emission lines in the 15 ?to 17 ?range, along with new theoret...
Time duration of the parametric x-ray radiation
X-rays, PXR, dynamical diffraction, femtosecond electron bunches
2011/8/31
Time evolution of the parametric X-Ray radiation, produced by a relativistic charged particle passing through a crystal, is studied. The most attention is given to the cases when the radiation lasts m...