scholarly journals Sub-nanosecond single line-of-sight (SLOS) x-ray imagers (invited)

2018 ◽  
Vol 89 (10) ◽  
pp. 10G123 ◽  
Author(s):  
K. Engelhorn ◽  
T. J. Hilsabeck ◽  
J. Kilkenny ◽  
D. Morris ◽  
T. M. Chung ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
X Ray

scholarly journals The single-line-of-sight, time-resolved x-ray imager diagnostic on OMEGA

2018 ◽  
Vol 89 (10) ◽  
pp. 10G117 ◽  
Author(s):  
W. Theobald ◽  
C. Sorce ◽  
M. Bedzyk ◽  
S. T. Ivancic ◽  
F. J. Marshall ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
Time Resolved ◽  
X Ray

scholarly journals Progress on the development of a single line of sight x-ray framing camera

2004 ◽  
Vol 75 (10) ◽  
pp. 4054-4056 ◽  
Author(s):  
D. K. Bradley ◽  
J. P. Holder ◽  
C. M. Damian ◽  
K. W. Piston ◽  
P. M. Bell ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
X Ray ◽  
Framing Camera

Further development of a single line of sight x-ray framing camera

2003 ◽  
Vol 74 (3) ◽  
pp. 2191-2193 ◽  
Author(s):  
J. P. Holder ◽  
K. W. Piston ◽  
D. K. Bradley ◽  
P. M. Bell ◽  
A. K. L. Dymoke-Bradshaw ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
X Ray ◽  
Further Development ◽  
Framing Camera

scholarly journals Simultaneous neutron and x-ray imaging of inertial confinement fusion experiments along a single line of sight at Omega

2015 ◽  
Vol 86 (4) ◽  
pp. 043503 ◽  
Author(s):  
C. R. Danly ◽  
T. H. Day ◽  
D. N. Fittinghoff ◽  
H. Herrmann ◽  
N. Izumi ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Single Line ◽  
Line Of Sight ◽  
Inertial Confinement ◽  
X Ray ◽  
X Ray Imaging ◽  
Confinement Fusion ◽  
Fusion Experiments

scholarly journals The dilation aided single–line–of–sight x–ray camera for the National Ignition Facility: Characterization and fielding

2018 ◽  
Vol 89 (10) ◽  
pp. 10G125 ◽  
Author(s):  
S. R. Nagel ◽  
A. C. Carpenter ◽  
J. Park ◽  
M. S. Dayton ◽  
P. M. Bell ◽  
...  
Keyword(s):  
Single Line ◽  
Line Of Sight ◽  
National Ignition Facility ◽  
X Ray

First Demonstration of an Acousto-Optically Modulated Quantum Cascade Laser As a Broadband, Time-Resolved Combustion Diagnostic

2018 ◽  
Author(s):  
Zachary E. Loparo ◽  
Kareem Ahmed ◽  
Subith S. Vasu ◽  
Andrey V. Muraviev ◽  
Pedro Figueiredo ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Gas Turbines ◽  
Chemical Kinetic ◽  
Single Line ◽  
Line Of Sight ◽  
Spectral Measurements ◽  
Time Resolved ◽  
Quantum Cascade ◽  
No Formation ◽  
Multiple Species

We provide the first demonstration of an acousto-optically modulated quantum cascade laser (AOM QCL) system as a diagnostic for combustion by measuring nitric oxide (NO), a highly-regulated emission produced in gas turbines. The system provides time-resolved broadband spectral measurements of the present gas species via a single line of sight measurement, offering advantages over widely used narrowband absorption spectroscopy (e.g., the potential for simultaneous multi-species measurements using a single laser) and considerably faster (> 15kHz rates and potentially up to MHz) than sampling techniques which employ FTIR or GC/MS. The developed AOM QCL system yields fast tunable output covering a spectral range of 1725–1930 cm−1 with a linewidth of 10–15 cm−1. For the demonstration experiment, the AOM QCL system has been used to obtain time-resolved spectral measurements of NO formation during the shock heating of mixture of a 10% nitrous oxide (N2O) in a balance of argon over a temperature range of 1245–2517 K and a pressure range of 3.6–5.8 atm. Results were in good agreement with chemical kinetic simulations. The system shows revolutionary promise for making simultaneous time-resolved measurements of multiple species concentrations and temperature with a single line of sight measurement.

scholarly journals The confrontation of the shock-powered synchrotron maser model with the Galactic FRB 200428

2020 ◽  
Vol 500 (2) ◽  
pp. 2704-2710 ◽  
Author(s):  
Yun-Wei Yu ◽  
Yuan-Chuan Zou ◽  
Zi-Gao Dai ◽  
Wen-Fei Yu
Keyword(s):  
Line Of Sight ◽  
Model Parameters ◽  
Observational Constraints ◽  
Synchrotron Emission ◽  
Physical Processes ◽  
X Ray ◽  
Emission Efficiency ◽  
Free Parameters ◽  
Fast Radio Burst ◽  
Parameter Constraints

ABSTRACT The association of FRB 200428 with an X-ray burst (XRB) from the Galactic magnetar SGR 1935+2154 offers important implications for the physical processes responsible for the fast radio burst (FRB) phenomena. By assuming that the XRB emission is produced in the magnetosphere, we investigate the possibility that the FRB emission is produced by shock-powered synchrotron maser (SM), which is phenomenologically described with a number of free parameters. The observational constraints on the model parameters indicate that the model can in principle be consistent with the FRB 200428 observations, if the ejecta lunched by magnetar activities can have appropriate ingredients and structures and the shock processes occur on the line of sight. To be specific, a complete burst ejecta should consist of an ultra-relativistic and extremely highly collimated e± component and a sub-relativistic and wide-spreading baryonic component. The internal shocks producing the FRB emission arise from a collision between the e± ejecta and the remnant of a previous baryonic ejecta at the same direction. The parameter constraints depend on the uncertain spectrum and efficiency of the SM emission. While the spectrum is tentatively described by a spectral index of −2, we estimate the emission efficiency to be around 10−4 by requiring that the synchrotron emission of the shocked material cannot be much brighter than the magnetosphere XRB emission.

scholarly journals Model of a Precessing Jet in 3C 279

1998 ◽  
Vol 164 ◽  
pp. 47-48 ◽  
Author(s):  
Z. Abraham ◽  
E.A. Carrara ◽  
J.A. Zensus
Keyword(s):  
Lorentz Factor ◽  
Line Of Sight ◽  
Geometrical Parameters ◽  
X Ray ◽  
Maximum Value ◽  
Doppler Factor ◽  
The Individual ◽  
Relativistic Particles

AbstractThe parsec scale radio jet of 3C 279 presents a number of superluminal features that move along straight trajectories with constant velocities. The position angles P.A. of these trajectories, projected in the plane of the sky, and the velocities βobs of the individual components are different. We interpret the differences in the these velocities as differences in the angle between the jet and the line of sight and apply the model of a precessing beam to the data. All the geometrical parameters of the precessing jet and the Lorentz factor γ of the relativistic particles are determined. The model predicts the behavior of the Doppler factor δ as a function of time and we verify that its maximum value occurred at the epochs in which strong optical and X-ray flares were observed.

scholarly journals The mergers in Abell 2256: displaced gas and its connection to the radio-emitting plasma

2020 ◽  
Vol 495 (4) ◽  
pp. 5014-5026 ◽  
Author(s):  
J P Breuer ◽  
N Werner ◽  
F Mernier ◽  
T Mroczkowski ◽  
A Simionescu ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Large Scale ◽  
Cold Front ◽  
Low Frequency ◽  
Brightness Distribution ◽  
Analytical Models ◽  
Line Of Sight ◽  
Cluster Galaxy ◽  
X Ray ◽  
Low Entropy

ABSTRACT We present the results of deep Chandra and XMM–Newton X-ray imaging and spatially resolved spectroscopy of Abell 2256, a nearby (z = 0.058) galaxy cluster experiencing multiple mergers and displaying a rich radio morphology dominated by a large relic. The X-ray data reveal three subclusters: (i) the ‘main cluster’; (ii) the remnant of an older merger in the east of the cluster with an ∼600 kpc-long tail; (iii) a bright, bullet-like, low-entropy infalling system, with a large line-of-sight velocity component. The low-entropy system displays a 250 kpc-long cold front with a break and an intriguing surface brightness decrement. Interestingly, the infalling gas is not co-spatial with bright galaxies and the radio-loud brightest cluster galaxy of the infalling group appears dissociated from the low-entropy plasma by ∼50 kpc in projection, to the south of the eastern edge of the cold front. Assuming that the dark matter follows the galaxy distribution, we predict that it is also significantly offset from the low-entropy gas. Part of the low-frequency radio emission near the cold front might be revived by magnetic field amplification due to differential gas motions. Using analytical models and numerical simulations, we investigate the possibility that the supersonic infall of the subcluster generates a large-scale shock along our line of sight, which can be detected in the X-ray temperature map but is not associated with any clear features in the surface brightness distribution.

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