scholarly journals Spectroscopic diagnostics of high temperature plasmas, January 1, 1991--December 31, 1991

1991 ◽  
Author(s):  
Keyword(s):  
High Temperature ◽  
Spectroscopic Diagnostics

High-temperature plasma in solar flares

1991 ◽  
Vol 336 (1643) ◽  
pp. 451-460 ◽  
Keyword(s):  
High Temperature ◽  
Solar Flares ◽  
Crystal Spectrometer ◽  
Temperature Plasma ◽  
X Ray ◽  
Physical Conditions ◽  
Bent Crystal ◽  
Spectroscopic Diagnostics ◽  
High Temperature Plasma ◽  
Ionization Balance

The thermal soft X-ray flare plasma is at temperatures ranging from a few million degrees up to about 40 x 10 6 K. In this paper I discuss some current problems in our understanding of the physical conditions in this plasma, particularly the ionization balance and the possible detection of non-thermal electrons. I discuss X-ray spectroscopic diagnostics that might help in resolving some of the issues, and I also discuss the possibility of addressing these problems with the bent crystal spectrometer experiment to be flown on Solar-A.

Spectroscopic Diagnostics of Tokamaks

1988 ◽  
Vol 102 ◽  
pp. 165-174
Author(s):  
C. de Michelis
Keyword(s):  
Transport Properties ◽  
Power Losses ◽  
Spectroscopic Diagnostics ◽  
Important Concern

AbstractImpurities being an important concern in tokamaks, spectroscopy plays a key role in their understanding. Techniques for the evaluation of concentrations, power losses and transport properties are surveyed, and a few developments are outlined.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

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