scholarly journals The Rainwater Memorial Calibration Facility for X-Ray Optics

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Nicolai F. Brejnholt ◽  
Finn E. Christensen ◽  
Charles J. Hailey ◽  
Nicolas M. Barrière ◽  
William W. Craig ◽  
...  
Keyword(s):  
Energy Range ◽  
Large Diameter ◽  
Silicon Wafers ◽  
Telescope Array ◽  
X Ray ◽  
Explorer Mission ◽  
Source Distance ◽  
Distance Effects ◽  
Calibration Facility ◽  
Ground Calibration

The Nuclear Spectroscopic Telescope ARray (NuSTAR) is a NASA Small Explorer mission that will carry the first focusing hard X-ray (5–80 keV) telescope to orbit. The ground calibration of the optics posed a challenge as the need to suppress finite source distance effects over the full optic and the energy range of interest were unique requirements not met by any existing facility. In this paper we present the requirements for the NuSTAR optics ground calibration, and how the Rainwater Memorial Calibration Facility, RaMCaF, is designed to meet the calibration requirements. The nearly 175 m long beamline sports a 48 cm diameter 5–100 keV X-ray beam and is capable of carrying out detailed studies of large diameter optic elements, such as the NuSTAR optics, as well as flat multilayer-coated Silicon wafers.

Diffuse x-ray scattering study of the formation of microdefects in heat-treated dislocation-free large-diameter silicon wafers

2003 ◽  
Vol 45 (10) ◽  
pp. 1918-1925 ◽  
Author(s):  
V. T. Bublik ◽  
S. Yu. Matsnev ◽  
K. D. Shcherbachev ◽  
M. V. Mezhennyi ◽  
M. G. Mil’vidskii ◽  
...  
Keyword(s):  
Large Diameter ◽  
Silicon Wafers ◽  
X Ray ◽  
X Ray Scattering ◽  
Heat Treated ◽  
Scattering Study ◽  
Ray Scattering

Synchrotron-radiation X-ray topography of surface strain in large-diameter silicon wafers

2002 ◽  
Vol 9 (3) ◽  
pp. 166-168 ◽  
Author(s):  
S. Kawado ◽  
S. Iida ◽  
S. Yamaguchi ◽  
S. Kimura ◽  
Y. Hirose ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Large Diameter ◽  
Silicon Wafers ◽  
Surface Strain ◽  
X Ray

scholarly journals NuSTAR measurement of the cosmic X-ray background in the 3–20 keV energy band

2021 ◽  
Vol 502 (3) ◽  
pp. 3966-3975
Author(s):  
Roman Krivonos ◽  
Daniel Wik ◽  
Brian Grefenstette ◽  
Kristin Madsen ◽  
Kerstin Perez ◽  
...  
Keyword(s):  
Energy Range ◽  
Energy Band ◽  
Spectral Shape ◽  
Spatial Modulation ◽  
Photon Statistics ◽  
Telescope Array ◽  
X Ray ◽  
Relative Scatter ◽  
X Ray Background ◽  
Systematic Noise

ABSTRACT We present measurements of the intensity of the cosmic X-ray background (CXB) with the Nuclear Spectroscopic Telescope Array (NuSTAR) telescope in the 3–20 keV energy range. Our method uses spatial modulation of the CXB signal on the NuSTAR detectors through the telescope’s side aperture. Based on the NuSTAR observations of selected extragalactic fields with a total exposure of 7 Ms, we have estimated the CXB 3–20 keV flux to be 2.8 × 10−11 erg s−1 cm−2 deg−2, which is $\sim \! 8{{\ \rm per\ cent}}$ higher than that measured with HEAO-1 and consistent with the INTEGRAL measurement. The inferred CXB spectral shape in the 3–20 keV energy band is consistent with the canonical model of Gruber et al. We demonstrate that the spatially modulated CXB signal measured by NuSTAR is not contaminated by systematic noise and is limited by photon statistics. The measured relative scatter of the CXB intensity between different sky directions is compatible with cosmic variance, which opens new possibilities for studying CXB anisotropy over the whole sky with NuSTAR.

Gravitational Stress‐Induced Dislocations in Large‐Diameter Silicon Wafers Studied by X‐Ray Topography and Computer Simulation

1998 ◽  
Vol 145 (7) ◽  
pp. 2523-2529 ◽  
Author(s):  
Hirofumi Shimizu ◽  
Seiichi Isomae ◽  
Kyoko Minowa ◽  
Tomomi Satoh ◽  
Tadashi Suzuki
Keyword(s):  
Computer Simulation ◽  
Large Diameter ◽  
Silicon Wafers ◽  
X Ray ◽  
Gravitational Stress

scholarly journals Low Dose Rate X-Ray Radiation Fields Implementation for Study of Energy Response of the Dosimeters Based on Scintillation Detectors

2019 ◽  
Vol 10 (2) ◽  
pp. 128-137
Author(s):  
A. V. Novichenko ◽  
R. V. Lukashevich ◽  
K. G. Senkovsky
Keyword(s):  
Energy Range ◽  
Dose Rate ◽  
Low Dose ◽  
Photon Radiation ◽  
Scintillation Detectors ◽  
Sensitive Volume ◽  
Energy Response ◽  
X Ray ◽  
Low Dose Rate ◽  
Calibration Facility

Near background low dose rate measurements are important part of the environmental radiation monitoring. It is possible to fulfill energy response verification for the high sensitive dosimeters based on inorganic scintillation detectors in low energy region when creating reference X-ray fields with dose rates up to 5 µSv/h. The aim of this work was to create and study reference X-ray fields with low dose rate and narrow spectrum in the energy range from 15 to 250 keV using high-purity metal filters as a part of X-ray irradiator of AT300 X-ray calibration facility.To determine the main characteristics of created X-ray fields highly sensitive comparators of photon radiation based on NaI(Tl) scintillation detectors was used. The comparators were developed in “ATOMTEX”. To verify comparators energy response the reference AT5350/1 dosimeter and ionization chamber TM32003 with sensitive volume 10000 cm3 were used.Characteristics of X-ray fields that were created on the AT300 X-ray calibration facility to verify the energy response of high sensitive dosimeters based on scintillation detectors were investigated. The possibility to calibrate high sensitive dosimetric measuring instruments based on scintillation detectors in the energy range up to 250 keV in X-ray beams was shown.

Arsenic segregation in polysilicon

1983 ◽  
Vol 41 ◽  
pp. 154-155 ◽  
Author(s):  
P.E. Batson ◽  
C.R.M. Grovenor ◽  
D.A. Smith ◽  
C. Wong
Keyword(s):  
Incident Beam ◽  
Silicon Wafers ◽  
Chemical Polishing ◽  
Bright Field Image ◽  
Beam Size ◽  
Stem Analysis ◽  
Bright Field ◽  
Twin Boundaries ◽  
X Ray ◽  
Line Scan

In this work As doped polysilicon was deposited onto (100) silicon wafers by APCVD at 660°C from a silane-arsine mixture, followed by a ten minute anneal at 1000°C, and in one case a further ten minute anneal at 700°C. Specimens for TEM and STEM analysis were prepared by chemical polishing. The microstructure, which is unchanged by the final 700°C anneal,is shown in Figure 1. It consists of numerous randomly oriented grains many of which contain twins.X-ray analysis was carried out in a VG HB5 STEM. As K α x-ray counts were collected from STEM scans across grain and twin boundaries, Figures 2-4. The incident beam size was about 1.5nm in diameter, and each of the 20 channels in the plots was sampled from a 1.6nm length of the approximately 30nm line scan across the boundary. The bright field image profile along the scanned line was monitored during the analysis to allow correlation between the image and the x-ray signal.

L X-RAY FLUORESCENCE CROSS-SECTIONS MEASUREMENTS FOR ELEMENTS 56≤Z≤66 IN THE ENERGY RANGE 11-41 keV

1987 ◽  
Vol 48 (C9) ◽  
pp. C8-669-C8-672 ◽  
Author(s):  
S. SINGH ◽  
S. KUMAR ◽  
D. MEHTA ◽  
M. L. GARG ◽  
N. SINGH ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
X Ray

A new SOLARIS beamline optimized for X-ray spectroscopy in the tender energy range

2021 ◽  
Vol 489 ◽  
pp. 76-81
Author(s):  
Josef Hormes ◽  
Wantana Klysubun ◽  
Jost Göttert ◽  
Henning Lichtenberg ◽  
Alexey Maximenko ◽  
...  
Keyword(s):  
Energy Range ◽  
X Ray

scholarly journals Properties of Faint X-ray Activity of XTE J1908+094 in 2019

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 25
Author(s):  
Debjit Chatterjee ◽  
Arghajit Jana ◽  
Kaushik Chatterjee ◽  
Riya Bhowmick ◽  
Sujoy Kumar Nath ◽  
...  
Keyword(s):  
Black Hole ◽  
Temporal Analysis ◽  
Power Density Spectrum ◽  
Periodic Oscillations ◽  
Telescope Array ◽  
Density Spectrum ◽  
X Ray ◽  
Black Hole Candidate ◽  
Short Period ◽  
Spectral State

We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from Nuclear Spectroscopic Telescope Array (NuSTAR). We have not observed any quasi-periodic-oscillations (QPOs) in the power density spectrum (PDS). The spectral study suggests that the source remained in the softer (more precisely, in the soft–intermediate) spectral state during this short period of X-ray activity. We notice a faint but broad Fe Kα emission line at around 6.5 keV. We also estimate the probable mass of the black hole to be 6.5−0.7+0.5M⊙, with 90% confidence.

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