Tentative study on high-photon-energy quasi-x-ray laser generator by forming plasma x-ray source

2001 ◽  
Author(s):  
Eiichi Sato ◽  
Yasuomi Hayasi ◽  
Toshio Ichimaru ◽  
Hidezo Mori ◽  
Etsuro Tanaka ◽  
...  
Keyword(s):  
Photon Energy ◽  
High Photon Energy ◽  
X Ray

Fundamental Techniques for High Photon Energy Stability of a Modern Soft X-ray Beamline

2007 ◽  
Author(s):  
Yasunori Senba ◽  
Haruhiko Ohashi ◽  
Hikaru Kishimoto ◽  
Takanori Miura ◽  
Shunji Goto ◽  
...  
Keyword(s):  
Photon Energy ◽  
Energy Stability ◽  
High Photon Energy ◽  
X Ray

Note: Characterization of a high-photon-energy X-ray imager

2013 ◽  
Vol 84 (10) ◽  
pp. 106103 ◽  
Author(s):  
M. Storm ◽  
B. Eichman ◽  
Z. Zhong ◽  
W. Theobald ◽  
P. Schiebel ◽  
...  
Keyword(s):  
Photon Energy ◽  
High Photon Energy ◽  
X Ray

Soft X-ray photon energy calibration using multilayer mirror

2020 ◽  
Author(s):  
Kiranjot ◽  
Mangalika Sinha ◽  
R. K. Gupta ◽  
P. K. Yadav ◽  
Mohammed H. Modi
Keyword(s):  
Photon Energy ◽  
Energy Calibration ◽  
X Ray ◽  
Multilayer Mirror

scholarly journals Monte Carlo Modeling and Design of Photon Energy Attenuation Layers for >10× Quantum Yield Enhancement in Si-Based Hard X-ray Detectors

Instruments ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 17
Author(s):  
Eldred Lee ◽  
Kaitlin M. Anagnost ◽  
Zhehui Wang ◽  
Michael R. James ◽  
Eric R. Fossum ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Quantum Yield ◽  
Photon Energy ◽  
High Efficiency ◽  
High Energy ◽  
Yield Enhancement ◽  
X Ray ◽  
Simulation Results ◽  
Conversion Efficiencies

High-energy (>20 keV) X-ray photon detection at high quantum yield, high spatial resolution, and short response time has long been an important area of study in physics. Scintillation is a prevalent method but limited in various ways. Directly detecting high-energy X-ray photons has been a challenge to this day, mainly due to low photon-to-photoelectron conversion efficiencies. Commercially available state-of-the-art Si direct detection products such as the Si charge-coupled device (CCD) are inefficient for >10 keV photons. Here, we present Monte Carlo simulation results and analyses to introduce a highly effective yet simple high-energy X-ray detection concept with significantly enhanced photon-to-electron conversion efficiencies composed of two layers: a top high-Z photon energy attenuation layer (PAL) and a bottom Si detector. We use the principle of photon energy down conversion, where high-energy X-ray photon energies are attenuated down to ≤10 keV via inelastic scattering suitable for efficient photoelectric absorption by Si. Our Monte Carlo simulation results demonstrate that a 10–30× increase in quantum yield can be achieved using PbTe PAL on Si, potentially advancing high-resolution, high-efficiency X-ray detection using PAL-enhanced Si CMOS image sensors.

Improved spatial resolution and lower-dose pediatric CT imaging: a feasibility study to evaluate narrowing the X-ray photon energy spectrum

2014 ◽  
Vol 44 (8) ◽  
pp. 1026-1030
Author(s):  
Mark G. Benz ◽  
Matthew W. Benz ◽  
Steven B. Birnbaum ◽  
Eric Chason ◽  
Brian W. Sheldon ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Feasibility Study ◽  
Spatial Resolution ◽  
Photon Energy ◽  
Ct Imaging ◽  
X Ray ◽  
Pediatric Ct ◽  
Photon Energy Spectrum

The Effect of Photon Energy Weighting on X-ray Imaging Based on a Photon Counting Detector

2011 ◽  
Vol 59 (5) ◽  
pp. 3114-3119 ◽  
Author(s):  
Yu-Na Choi ◽  
Seung-Wan Lee ◽  
Hyo-Min Cho ◽  
Hyun-Ju Ryu ◽  
Young-Jin Lee ◽  
...  
Keyword(s):  
Photon Energy ◽  
Photon Counting ◽  
X Ray ◽  
Photon Counting Detector ◽  
X Ray Imaging ◽  
Energy Weighting

scholarly journals Nanofocusing Optics for an X-Ray Free-Electron Laser Generating an Extreme Intensity of 100 EW/cm2 Using Total Reflection Mirrors

2020 ◽  
Vol 10 (7) ◽  
pp. 2611
Author(s):  
Hirokatsu Yumoto ◽  
Yuichi Inubushi ◽  
Taito Osaka ◽  
Ichiro Inoue ◽  
Takahisa Koyama ◽  
...  
Keyword(s):  
Photon Energy ◽  
Pulse Energy ◽  
Free Electron ◽  
Free Electron Laser ◽  
Total Reflection ◽  
Experimental Chamber ◽  
X Rays ◽  
X Ray ◽  
Set Up ◽  
Focused Beam

A nanofocusing optical system—referred to as 100 exa—for an X-ray free-electron laser (XFEL) was developed to generate an extremely high intensity of 100 EW/cm2 (1020 W/cm2) using total reflection mirrors. The system is based on Kirkpatrick-Baez geometry, with 250-mm-long elliptically figured mirrors optimized for the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) XFEL facility. The nano-precision surface employed is coated with rhodium and offers a high reflectivity of 80%, with a photon energy of up to 12 keV, under total reflection conditions. Incident X-rays on the optics are reflected with a large spatial acceptance of over 900 μm. The focused beam is 210 nm × 120 nm (full width at half maximum) and was evaluated at a photon energy of 10 keV. The optics developed for 100 exa efficiently achieved an intensity of 1 × 1020 W/cm2 with a pulse duration of 7 fs and a pulse energy of 150 μJ (25% of the pulse energy generated at the light source). The experimental chamber, which can provide different stage arrangements and sample conditions, including vacuum environments and atmospheric-pressure helium, was set up with the focusing optics to meet the experimental requirements.

scholarly journals Improving the energy resolution of bent crystal X-ray spectrometers with position-sensitive detectors

2014 ◽  
Vol 21 (4) ◽  
pp. 762-767 ◽  
Author(s):  
Ari-Pekka Honkanen ◽  
Roberto Verbeni ◽  
Laura Simonelli ◽  
Marco Moretti Sala ◽  
Ali Al-Zein ◽  
...  
Keyword(s):  
High Resolution ◽  
Internal Stress ◽  
Photon Energy ◽  
Energy Resolution ◽  
Preceding Paper ◽  
X Ray ◽  
Bent Crystal ◽  
Position Sensitive ◽  
Position Sensitive Detectors ◽  
Bent Crystals

Wavelength-dispersive high-resolution X-ray spectrometers often employ elastically bent crystals for the wavelength analysis. In a preceding paper [Honkanenet al.(2014).J. Synchrotron Rad.21, 104–110] a theory for quantifying the internal stress of a macroscopically large spherically curved analyser crystal was presented. Here the theory is applied to compensate for the corresponding decrease of the energy resolution. The technique is demonstrated with a Johann-type spectrometer using a spherically bent Si(660) analyser in near-backscattering geometry, where an improvement in the energy resolution from 1.0 eV down to 0.5 eV at 9.7 keV incident photon energy was observed.

A scanning transmission X-ray microscope at the Pohang Light Source

2018 ◽  
Vol 25 (3) ◽  
pp. 878-884 ◽  
Author(s):  
Hyun-Joon Shin ◽  
Namdong Kim ◽  
Hee-Seob Kim ◽  
Wol-Woo Lee ◽  
Chae-Soon Lee ◽  
...  
Keyword(s):  
Energy Range ◽  
Light Source ◽  
Photon Energy ◽  
Chemical State ◽  
Photon Energy Range ◽  
X Rays ◽  
X Ray ◽  
Space Resolution ◽  
Scanning Transmission ◽  
Pohang Light Source

A scanning transmission X-ray microscope is operational at the 10A beamline at the Pohang Light Source. The 10A beamline provides soft X-rays in the photon energy range 100–2000 eV using an elliptically polarized undulator. The practically usable photon energy range of the scanning transmission X-ray microscopy (STXM) setup is from ∼150 to ∼1600 eV. With a zone plate of 25 nm outermost zone width, the diffraction-limited space resolution, ∼30 nm, is achieved in the photon energy range up to ∼850 eV. In transmission mode for thin samples, STXM provides the element, chemical state and magnetic moment specific distributions, based on absorption spectroscopy. A soft X-ray fluorescence measurement setup has been implemented in order to provide the elemental distribution of thicker samples as well as chemical state information with a space resolution of ∼50 nm. A ptychography setup has been implemented in order to improve the space resolution down to 10 nm. Hardware setups and application activities of the STXM are presented.

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