A Calibrated Large-area X-Ray Source for Plasma Spectroscopy

1987 ◽  
Vol 42 (10) ◽  
pp. 1051-1053
Author(s):  
H. W. Morsi ◽  
H. Röhr ◽  
U. Schumacher
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Line Emission ◽  
Absolute Calibration ◽  
Plasma Spectroscopy ◽  
Large Area ◽  
Double Crystal ◽  
X Ray ◽  
Area X ◽  
A Current

A large-area (10 x 30 cm2) X -ray source for relative and absolute calibration of double-crystal monochromators for plasma soft X -ray spectroscopy was developed. For a voltage of 20 kV and a current of 1 mA uniform and reproducible emission is achieved at a level of about 30 mW /(m2 · sr) for Kx, line emission in the photon energy range from 1 keV to about 8 keV, while the Lx line emission increases with photon energy from 10 to 20 m W/(m2 · sr).

scholarly journals Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators

2019 ◽  
Vol 26 (6) ◽  
pp. 1879-1886
Author(s):  
Ronald Frahm ◽  
Qianshun Diao ◽  
Vadim Murzin ◽  
Benjamin Bornmann ◽  
Dirk Lützenkirchen-Hecht ◽  
...  
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Exafs Spectrum ◽  
Symmetric Case ◽  
Bragg Angle ◽  
Performance Tests ◽  
Asymmetric Channel ◽  
Double Crystal ◽  
X Ray ◽  
Exit Beam

X-ray double-crystal monochromators face a shift of the exit beam when the Bragg angle and thus the transmitted photon energy changes. This can be compensated for by moving one or both crystals accordingly. In the case of monolithic channel-cut crystals, which exhibit utmost stability, the shift of the monochromated beam is inevitable. Here we report performance tests of novel, asymmetrically cut, channel-cut crystals which reduce the beam movements by more than a factor of 20 relative to the symmetric case over the typical energy range of an EXAFS spectrum at the Cu K-edge. In addition, the presented formulas for the beam offset including the asymmetry angle directly indicate the importance of this value, which has been commonly neglected so far in the operation of double-crystal monochromators.

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.

Large-Area X-ray Lithography System for LIGA Process Operating in Wide Energy Range of Synchrotron Radiation

2005 ◽  
Vol 44 (7B) ◽  
pp. 5500-5504 ◽  
Author(s):  
Yuichi Utsumi ◽  
Takefumi Kishimoto ◽  
Tadashi Hattori ◽  
Hirotsugu Hara
Keyword(s):  
Synchrotron Radiation ◽  
Energy Range ◽  
Wide Energy Range ◽  
Large Area ◽  
X Ray ◽  
Wide Energy ◽  
Area X ◽  
Lithography System

A large area X-ray imager with online linearization and noise suppression

2011 ◽  
Author(s):  
T. He ◽  
R. Durst ◽  
B. L. Becker ◽  
J. Kaercher ◽  
G. Wachter
Keyword(s):  
Noise Suppression ◽  
Large Area ◽  
X Ray ◽  
Area X

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.

A Soft X-ray Experimental Facility

1984 ◽  
Vol 28 ◽  
pp. 127-135
Author(s):  
John V. Gilfrich ◽  
David J. Nagel ◽  
Mohammad Fatemi ◽  
Richard D. Bleach ◽  
Karrol R. Hudson
Keyword(s):  
Energy Range ◽  
Large Volume ◽  
High Vacuum ◽  
The Other ◽  
Experimental Chamber ◽  
Experimental Facility ◽  
Double Crystal ◽  
X Ray ◽  
Optical Instruments

AbstractA high vacuum soft x-ray source has been coupled to a large volume experimental chamber to provide a versatile facility for x-ray investigations in the energy range of 0.1 to 10 kev. The source chamber presently contains a modified Herike tube, but can employ any of a variety of source designs. The large experimental chamber is equipped with a kinematic mount to position a number of x-ray optical instruments. The source and experimental chambers are connected through a high vacuum valve/shutter, and are pumped separately with provision for a thin window to isolate one from the other, single and double crystal spectrometers have been used in the experimental chamber. A variable chord diffractometer/reflectometer using double crystal monnotiromatization has been designed, in addition, the facility has been used to expose photoresists in x-ray lithography tests.

Absolute Calibration of Photoelectric Diodes

1975 ◽  
Vol 19 ◽  
pp. 597-606 ◽  
Author(s):  
R. H. Day ◽  
E. J. T. Burns
Keyword(s):  
Energy Range ◽  
Average Energy ◽  
Ion Pair ◽  
Absolute Calibration ◽  
Tube System ◽  
X Ray

Photoelectric diodes with aluminum photocathod.es have been calibrated in the energy range from 0.1 keV to 1 keV with a multielement Henke X-ray tube system using regenerative monochromatic filters. The calibration is performed at six energies: (1) Be - (0.109 keV) , (2) C - Kα (0.277 keV), (3) Ti – Lα1, 2 (0.452 keV) , (4) Fe – Lα1, 2 (0.705 keV), (5) Cu – Lα1, 2 (0.930 keV), and (6) Al – Kαl, 2 (1.487 keV). Several different 99.9%, (1000 series) aluminum foils were calibrated for use as cathodes. In addition, the average energy per electron ion pair, W, has been measured for methane at these same energies.

Balloon Observations of Several Southern X-Ray Sources

1979 ◽  
Vol 3 (5) ◽  
pp. 349-350 ◽  
Author(s):  
J. G. Greenhill ◽  
M. L Duldig ◽  
M. W. Emery ◽  
A. G. Fenton ◽  
K. B. Fenton ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Transient Increase ◽  
Large Area ◽  
Gamma Ray Burst ◽  
X Ray ◽  
The University ◽  
Area X

The University of Tasmania balloon-borne large area X-ray telescope was flown from Alice Springs on 20 November 1978. A number of known X-ray sources were observed and a transient increase believed to be a gamma ray burst was detected.

scholarly journals Iron Line Emission from NGC1068

1989 ◽  
Vol 134 ◽  
pp. 167-172
Author(s):  
Katsuji Koyama
Keyword(s):  
Energy Range ◽  
Power Law ◽  
Equivalent Width ◽  
Line Emission ◽  
X Rays ◽  
Iron Line ◽  
X Ray ◽  
Central Engine ◽  
Photon Index ◽  
The Continuum

X-ray emission in the 2–10 keV energy range was observed with the Ginga satellite from the Seyfert 2 galaxy NGC1068. The continuum spectrum can be described by a power-law of photon index about 1.5. An intense iron line at 6.5 keV with an equivalent width of 1.3 keV was clearly noticed. The X-ray flux was about 6 × 10 −12 erg/sec/cm2 or 3 × 1041 erg/sec, assuming a distance of 22 Mpc. The observed spectrum is consistent with the scattering and reprocessing of X-rays by the gas surrounding the central engine. With this picture we estimate that the X-ray flux of the central engine is about 1043 - 1044 erg/sec, a typical value for a Seyfert 1 galaxy.

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