scholarly journals About diagnostics of Z-pinches hot points

2000 ◽  
Vol 18 (2) ◽  
pp. 291-296 ◽  
Author(s):  
V.Yu. POLITOV ◽  
A.V. POTAPOV ◽  
L.V. ANTONOVA
Keyword(s):  
Experimental Data ◽  
Theoretical Analysis ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Electrical Discharges ◽  
Maximum Compression ◽  
X Ray ◽  
Average Temperature ◽  
Radiation Spectra ◽  
Spectral Intensities

We present the results of X-ray diagnostics of Z-pinch hot points, formed during fast electrical discharges through exploding Al wires. Experimental data include the pinhole images and X-ray time integrated radiation spectra. These spectra were obtained with high spectral resolution in the range 1.5–2.2 keV, contained the most intensive resonance lines of Al H- and He-like ions. Comparison of the recorded lines width and peak intensities with the corresponding modeled values, enables us to estimate the main hydrodynamical parameters of hot point, such as average temperature and density, being achieved at a moment of its maximum compression. Additionally, on the base of theoretical analysis of the spectral intensities distribution in well-resolved Lyα satellites, the gradient of compression velocities field is concluded. Some features of the investigated lines spectra forming are discussed.

scholarly journals A High Spectral Resolution Observation of the Soft X‐Ray Diffuse Background with Thermal Detectors

2002 ◽  
Vol 576 (1) ◽  
pp. 188-203 ◽  
Author(s):  
D. McCammon ◽  
R. Almy ◽  
E. Apodaca ◽  
W. Bergmann Tiest ◽  
W. Cui ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
X Ray ◽  
Thermal Detectors ◽  
Resolution Observation ◽  
Diffuse Background

scholarly journals Goals for the Application of High-Resolution X-ray Spectroscopy to the Diagnosis of Stellar Coronal Plasmas

1990 ◽  
Vol 115 ◽  
pp. 94-109 ◽  
Author(s):  
Jeffrey L. Linsky
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Transient Flow ◽  
Emission Measure ◽  
Active Regions ◽  
High Sensitivity ◽  
High Spectral Resolution ◽  
Spectral Features ◽  
Signal To Noise ◽  
X Ray

AbstractI provide examples of how high-resolution x-ray spectra may be used to determine the temperature and emission measure distributions, electron densities, steady and transient flow velocities, and location of active regions in stellar coronae. For each type of measurement I estimate the minimum spectral resolution required to resolve the most useful spectral features. In general, high sensitivity is required to obtain sufficient signal-to-noise to exploit the high spectral resolution. Although difficult, each measurement should be achievable with the instrumentation proposed for AXAF.

scholarly journals High spectral resolution x-ray optics with highly oriented pyrolytic graphite

2006 ◽  
Vol 14 (10) ◽  
pp. 4570 ◽  
Author(s):  
H. Legall ◽  
H. Stiel ◽  
V. Arkadiev ◽  
A. A. Bjeoumikhov
Keyword(s):  
Spectral Resolution ◽  
Pyrolytic Graphite ◽  
High Spectral Resolution ◽  
Highly Oriented Pyrolytic Graphite ◽  
Ray Optics ◽  
X Ray

scholarly journals High Spatial/Spectral Resolution Studies of Eta Carinae

2005 ◽  
Vol 13 ◽  
pp. 799-801
Author(s):  
Theodore R. Gull ◽  
Keyword(s):  
Spectral Resolution ◽  
Large Scale ◽  
High Spectral Resolution ◽  
Space Telescope ◽  
X Ray ◽  
Eta Carinae ◽  
Imaging Spectrograph

AbstractWe have used the high spatial and high spectral resolution of the Space Telescope Imaging Spectrograph (STIS) to study Eta Carinae and the Homunculus. Since the last minimum in 1998.0, CCD spectral modes have followed changes in the Eta Carinae, and large-scale changes in the Homunculus. Since 2001.7, MAMA echelle-mode observations have followed changes in the Eta Carinae and the very nearby ejecta through the 2003.5 minimum. Very significant changes in the star and nebular occur as the X-Ray drop occurs in the minimum.

scholarly journals ASCA X-ray Spectra of Quiescent and Flaring Emission from AB Doradus

1995 ◽  
Vol 151 ◽  
pp. 168-169
Author(s):  
S.M. White ◽  
R. Pallavicini ◽  
J. Lim
Keyword(s):  
Spectral Resolution ◽  
Time Profile ◽  
High Spectral Resolution ◽  
High Quality ◽  
High Count ◽  
Background Spectrum ◽  
Strong Emission ◽  
X Ray ◽  
Hot Plasma ◽  
Decay Times

The Japanese satellite ASCA carries X-ray detectors which combine excellent sensitivity and high spectral resolution. We observed the young, rapidly-rotating K dwarf AB Doradus with ASCA in November 1993. The star’s X-ray flux was essentially steady for the first half of the observation, and then a series of flares occurred during the second half. The flares showed rise times of 30 minutes and decay times of several hours. The quiescent X-ray luminosity was 2 × 1030 ergs s−1 (0.5-10 keV). At the flare peaks, LX(> 0.5 keV)/Lbol = .002.AB Dor has a relatively high count rate in the ASCA data and we can obtain high-quality spectra for different periods of the light curve. In Fig. 1 we present spectra corresponding to the period of quiescence, the rising phase and peak of each of the three flares combined, and the decay periods of each of the flares combined. The rise/peak curve (upper) has been multiplied by 2 for purposes of display. We have subtracted the quiescent spectrum from the flare spectra (i.e., used it as a background spectrum) for this display and subsequent analysis.The detailed differences between these spectra display the importance of the high spectral resolution provided by ASCA. One important difference, not readily evident in this figure, is the Fe K line complex at 6.4-6.7 keV. This line, a diagnostic of hot plasma, is strong in the rise/peak spectrum, moderate in the decay spectrum and weak in the quiescent spectrum. A time profile of the counts in this energy range shows little significant emission during the quiescent periods but strong emission at the flare peaks.

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