Small-Scale Structure of Thermal X-Ray Background of the Solar Corona and Microflares in the Photon Energy Range of 3-16 keV

2018 ◽  
Vol 44 (1) ◽  
pp. 92-101 ◽  
Author(s):  
I. K. Mirzoeva
Keyword(s):  
Energy Range ◽  
Solar Corona ◽  
Photon Energy ◽  
Scale Structure ◽  
Photon Energy Range ◽  
Small Scale ◽  
X Ray ◽  
Small Scale Structure ◽  
X Ray Background

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.

scholarly journals Gamma-rays from SS433: evidence for periodicity

2019 ◽  
Vol 485 (2) ◽  
pp. 2970-2975 ◽  
Author(s):  
Kajwan Rasul ◽  
Paula M Chadwick ◽  
Jamie A Graham ◽  
Anthony M Brown
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Temporal Analysis ◽  
Photon Energy Range ◽  
X Ray ◽  
Relativistic Jet ◽  
Gamma Ray Emission

ABSTRACT In this paper we present our study of the gamma-ray emission from the microquasar SS433. Integrating over 9 yr of Fermi-LAT Pass 8 data, we detect SS433 with a significance of ∼13σ in the 200 to 500 MeV photon energy range, with evidence for an extension in the direction of the w1 X-ray ‘hotspot’. A temporal analysis reveals evidence for modulation of SS433’s gamma-ray emission with the precession period of its relativistic jet. This suggests that at least some of SS433’s gamma-ray emission originates close to the object rather than from the jet termination regions.

Reducing the thermal deformation of InSb crystal by using double-bounce HHRMs in the TPS tender X-ray absorption spectroscopy beamline

2021 ◽  
Vol 28 (4) ◽  
Author(s):  
Din-Goa Liu ◽  
Ming-Han Lee ◽  
Ying-Jui Lu ◽  
Jyh-Fu Lee ◽  
Chi-Liang Chen
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Absorption Spectroscopy ◽  
Thermal Load ◽  
Incident Angle ◽  
Silicon Surfaces ◽  
Photon Energy Range ◽  
Double Crystal ◽  
X Ray ◽  
X Ray Absorption

The Taiwan Photon Source (TPS) with high brightness and energy tunability is suitable for applications in spectroscopy. The tender X-ray absorption beamline will be optimized for X-ray absorption spectroscopy measurements using a bending-magnet source in a unique photon energy range (1.7–10 keV) and two crystal pairs [InSb(111) and Si(111)] separated using back-to-back double-crystal monochromators (DCMs). InSb crystals are typically used in the lower photon energy range of 1.7–3.5 keV. However, the poor thermal conductivity of InSb crystals leads to severe deformation. This factor should be considered when the monochromator is installed on a tender X-ray beamline in a storage ring with a high power density. There are many approaches to reducing the thermal load on the first crystal of a DCM. Double-bounce high harmonics rejection mirrors in front of the DCM serve not only to reduce the high-order harmonics but also to absorb considerable quantities of heat. Two coating stripes on the silicon surfaces with a variable incident angle will be key to solving the thermal load on this beamline.

Pseudopotential calculations of photoionization of atoms in the x-ray photon energy range and FEL beam monitor development

2015 ◽  
Vol 12 (3) ◽  
pp. 036002 ◽  
Author(s):  
V E Chernov ◽  
D L Dorofeev ◽  
S V Elfimov ◽  
B A Zon ◽  
G E Gavrilov ◽  
...  
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Photon Energy Range ◽  
X Ray ◽  
Pseudopotential Calculations ◽  
Beam Monitor

A novel flat-response x-ray detector in the photon energy range of 0.1–4 keV

2010 ◽  
Vol 81 (7) ◽  
pp. 073504 ◽  
Author(s):  
Zhichao Li ◽  
Xiaohua Jiang ◽  
Shenye Liu ◽  
Tianxuan Huang ◽  
Jian Zheng ◽  
...  
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Photon Energy Range ◽  
X Ray

Commissioning of a multi-beamline femtoslicing facility at SOLEIL

2018 ◽  
Vol 25 (2) ◽  
pp. 385-398 ◽  
Author(s):  
Marie Labat ◽  
Jean-Blaise Brubach ◽  
Alessandra Ciavardini ◽  
Marie-Emmanuelle Couprie ◽  
Erik Elkaim ◽  
...  
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Research Area ◽  
Research Field ◽  
Photon Energy Range ◽  
Dispersion Function ◽  
Ultrafast Dynamics ◽  
Picosecond Pulses ◽  
X Ray ◽  
Active Research

The investigation of ultrafast dynamics, taking place on the few to sub-picosecond time scale, is today a very active research area pursued in a variety of scientific domains. With the recent advent of X-ray free-electron lasers (XFELs), providing very intense X-ray pulses of duration as short as a few femtoseconds, this research field has gained further momentum. As a consequence, the demand for access strongly exceeds the capacity of the very few XFEL facilities existing worldwide. This situation motivates the development of alternative sub-picosecond pulsed X-ray sources among which femtoslicing facilities at synchrotron radiation storage rings are standing out due to their tunability over an extended photon energy range and their high stability. Following the success of the femtoslicing installations at ALS, BESSY-II, SLS and UVSOR, SOLEIL decided to implement a femtoslicing facility. Several challenges were faced, including operation at the highest electron beam energy ever, and achievement of slice separation exclusively with the natural dispersion function of the storage ring. SOLEIL's setup also enables, for the first time, delivering sub-picosecond pulses simultaneously to several beamlines. This last feature enlarges the experimental capabilities of the facility, which covers the soft and hard X-ray photon energy range. In this paper, the commissioning of this original femtoslicing facility is reported. Furthermore, it is shown that the slicing-induced THz signal can be used to derive a quantitative estimate for the degree of energy exchange between the femtosecond infrared laser pulse and the circulating electron bunch.

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