Simultaneous operation of auxiliary X-ray tubes for commercial generators

1968 ◽  
Vol 1 (5) ◽  
pp. 330-330
Author(s):  
R. A. Trudo
Keyword(s):  
Simultaneous Operation ◽  
X Ray

scholarly journals Timepix3 detector network for nuclear waste monitoring

2021 ◽  
Vol 253 ◽  
pp. 07010
Author(s):  
Bartolomej Biskup ◽  
Benedikt Bergmann ◽  
Pavel Broulim ◽  
Petr Burian ◽  
Milan Malich ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Detection Efficiency ◽  
Energy Calibration ◽  
Fast Neutrons ◽  
Particle Type ◽  
Simultaneous Operation ◽  
Particle Detectors ◽  
X Ray ◽  
Timing Information

In the framework of the MICADO project we proposed an active long-term nuclear waste monitoring system based on Timepix3 technology. Particle detectors based on Timepix3 are capable of particle type discrimination and provide spectrometric information in combination with precise timing information. To maximize the versatility of the setup, the Timepix3 detectors employed are equipped with a range of different sensors. To enable measurement of neutrons, two quadrants of the detectors are covered by neutron converters, allowing detection of thermal neutron by capture in 6Li, as well as detection of fast neutrons through recoil protons generated in a polyethylene converter. Within this project a new housing for the detector unit and the readout was developed, with the network currently comprising of 9 such detectors. A specifically developed in-house software handles simultaneous operation of all devices, cluster analysis and data visualization. Energy calibration was performed using an X-ray tube with several fluorescence foils as well as photons from an 241Am source. The neutron and gamma/X-ray detection efficiency calibration was carried out at the Czech Metrology Institute and the results are presented here. Tests on simultaneous operation of all 9 devices were performed using uraninite and 241Am sources.

Single-shot arrival timing diagnostics for a soft X-ray free-electron laser beamline at SACLA

2018 ◽  
Vol 25 (1) ◽  
pp. 68-71 ◽  
Author(s):  
Shigeki Owada ◽  
Kyo Nakajima ◽  
Tadashi Togashi ◽  
Tetsuo Kayatama ◽  
Makina Yabashi
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Imaging System ◽  
Laser Pulses ◽  
Single Shot ◽  
Simultaneous Operation ◽  
One Dimensional ◽  
X Ray ◽  
Arrival Timing ◽  
Optical Laser

Arrival timing diagnostics performed at a soft X-ray free-electron laser (FEL) beamline of SACLA are described. Intense soft X-ray FEL pulses with one-dimensional focusing efficiently induce transient changes of optical reflectivity on the surface of GaAs. The arrival timing between soft X-ray FEL and optical laser pulses was successfully measured as a spatial position of the reflectivity change. The temporal resolution evaluated from the imaging system reaches ∼10 fs. This method requires only a small portion of the incident pulse energy, which enables the simultaneous operation of the arrival timing diagnostics and experiments by introducing a wavefront-splitting scheme.

scholarly journals All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source

2014 ◽  
Vol 47 (4) ◽  
pp. 1329-1336 ◽  
Author(s):  
S. Stoupin ◽  
S. A. Terentyev ◽  
V. D. Blank ◽  
Yu. V. Shvyd'ko ◽  
K. Goetze ◽  
...  
Keyword(s):  
Light Source ◽  
Coherent Light ◽  
Rigid Substrate ◽  
Simultaneous Operation ◽  
Double Crystal ◽  
X Ray ◽  
Monochromator Crystal ◽  
Linac Coherent Light Source ◽  
Coherent Light Source

A double-crystal diamond (111) monochromator recently implemented at the Linac Coherent Light Source (LCLS) enables splitting of the primary X-ray beam into a pink (transmitted) and a monochromatic (reflected) branch. The first monochromator crystal, with a thickness of ∼100 µm, provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. This article reports the design, fabrication and X-ray characterization of the first and second (300 µm-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a region of about 5 × 2 mm with low defect concentration, sufficient for use in X-ray optics at the LCLS. The optical assemblies holding the crystals were designed to provide mounting on a rigid substrate and to minimize mounting-induced crystal strain. The induced strain was evaluated using double-crystal X-ray topography and was found to be small over the 5 × 2 mm working regions of the crystals.

scholarly journals Simultaneous operation of two soft x-ray free-electron lasers driven by one linear accelerator

2016 ◽  
Vol 18 (6) ◽  
pp. 062002 ◽  
Author(s):  
B Faatz ◽  
E Plönjes ◽  
S Ackermann ◽  
A Agababyan ◽  
V Asgekar ◽  
...  
Keyword(s):  
Free Electron ◽  
Linear Accelerator ◽  
Free Electron Lasers ◽  
Simultaneous Operation ◽  
X Ray

A Computer Control for an X-Ray Fluorescence Analysis Unit

1974 ◽  
Vol 18 ◽  
pp. 309-316 ◽  
Author(s):  
B. E. Artz ◽  
Carol J. Kelly ◽  
M. A. Short
Keyword(s):  
Computer Control ◽  
Fluorescence Analysis ◽  
Stepping Motor ◽  
User Program ◽  
Simultaneous Operation ◽  
X Ray ◽  
Research Procedure ◽  
On Line ◽  
Beam Filter ◽  
Selection Of

AbstractAn X-ray fluorescence analysis unit has been automated with a multi-position sample changer, a stepping motor to position the spectrometer, and computer addressable switches to control the selection of crystal, detector, collimator, and beam filter. The unit can be controlled off-line through a Teletype or on-line with a computer. This computer utilizes a multi-user program for the simultaneous operation of the fluorescence analysis unit and two diffractometers. Programming the system for any desired analytical or research procedure is accomplished using an expanded version of BASIC.

scholarly journals Arrival timing diagnostics at a soft X-ray free-electron laser beamline of SACLA BL1

2019 ◽  
Vol 26 (3) ◽  
pp. 887-890 ◽  
Author(s):  
Shigeki Owada ◽  
Kyo Nakajima ◽  
Tadashi Togashi ◽  
Tetsuo Katayama ◽  
Hirokatsu Yumoto ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Imaging System ◽  
Splitting Method ◽  
Laser Pulses ◽  
Simultaneous Operation ◽  
X Ray ◽  
Gaas Wafer ◽  
Arrival Timing ◽  
Optical Laser

An arrival timing monitor for the soft X-ray free-electron laser (XFEL) beamline of SACLA BL1 has been developed. A small portion of the soft XFEL pulse is branched using the wavefront-splitting method. The branched FEL pulse is one-dimensionally focused onto a GaAs wafer to induce a transient reflectivity change. The beam branching method enables the simultaneous operation of the arrival timing diagnostics and experiments. The temporal resolution evaluated from the imaging system is ∼22 fs in full width at half-maximum, which is sufficient considering the temporal durations of the soft XFEL and the optical laser pulses.

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

White-Light Coronal Structures: Streamers and CMEs

1994 ◽  
Vol 144 ◽  
pp. 82
Author(s):  
E. Hildner
Keyword(s):  
Emission Line ◽  
Electron Density ◽  
White Light ◽  
Coronal Mass Ejections ◽  
X Rays ◽  
Solar Cycles ◽  
Temperature Function ◽  
X Ray ◽  
Eclipse Observations ◽  
Coronal Structures

AbstractOver the last twenty years, orbiting coronagraphs have vastly increased the amount of observational material for the whitelight corona. Spanning almost two solar cycles, and augmented by ground-based K-coronameter, emission-line, and eclipse observations, these data allow us to assess,inter alia: the typical and atypical behavior of the corona; how the corona evolves on time scales from minutes to a decade; and (in some respects) the relation between photospheric, coronal, and interplanetary features. This talk will review recent results on these three topics. A remark or two will attempt to relate the whitelight corona between 1.5 and 6 R⊙to the corona seen at lower altitudes in soft X-rays (e.g., with Yohkoh). The whitelight emission depends only on integrated electron density independent of temperature, whereas the soft X-ray emission depends upon the integral of electron density squared times a temperature function. The properties of coronal mass ejections (CMEs) will be reviewed briefly and their relationships to other solar and interplanetary phenomena will be noted.

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