High-resolution spectroscopy for Doppler-broadening ion temperature measurements of implosions at the National Ignition Facility

2012 ◽  
Vol 83 (10) ◽  
pp. 10E127 ◽  
Author(s):  
J. A. Koch ◽  
R. E. Stewart ◽  
P. Beiersdorfer ◽  
R. Shepherd ◽  
M. B. Schneider ◽  
...  
Keyword(s):  
High Resolution ◽  
Temperature Measurements ◽  
High Resolution Spectroscopy ◽  
Doppler Broadening ◽  
National Ignition Facility ◽  
Ion Temperature

Local ion temperature measurements from Doppler broadening of hydrogen lines using a fast atomic beam

1985 ◽  
Vol 25 (10) ◽  
pp. 1495-1498 ◽  
Author(s):  
E.L. Berezovskij ◽  
M.M. Berezovskaya ◽  
A.B. Izvozchikov ◽  
V.A. Krupin ◽  
V.A. Rantsev-Kartinov
Keyword(s):  
Atomic Beam ◽  
Temperature Measurements ◽  
Doppler Broadening ◽  
Ion Temperature ◽  
Hydrogen Lines

scholarly journals High-resolution spectroscopy diagnostics for measuring impurity ion temperature and velocity on the COMPASS tokamak

2015 ◽  
Vol 96-97 ◽  
pp. 1006-1011 ◽  
Author(s):  
Vladimir Weinzettl ◽  
Gaurav Shukla ◽  
Joydeep Ghosh ◽  
Radek Melich ◽  
Radomir Panek ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Spectroscopy ◽  
Ion Temperature ◽  
Impurity Ion

scholarly journals Модифицированный метод фарадеевского вращения для исследования атомных линий рубидия и калия в сверхтонких ячейках

2019 ◽  
Vol 126 (3) ◽  
pp. 253
Author(s):  
А. Саргсян ◽  
А. Амирян ◽  
Т.А. Вартанян ◽  
Д. Саркисян
Keyword(s):  
High Resolution ◽  
Faraday Rotation ◽  
Traditional Method ◽  
Spectral Width ◽  
High Resolution Spectroscopy ◽  
Doppler Broadening ◽  
Atomic Vapors ◽  
Modified Method ◽  
Atomic Lines ◽  
Spectrally Resolved

AbstractA nanocell filled with atomic vapors of rubidium and potassium was used to develop a modified method of Faraday rotation. The formed lines are characterized by a spectral width that is a factor of 1.5‒2 smaller than those obtained by traditional method of Faraday rotation in nanocells. The new method allows obtaining the spectral width of atomic line that is 8 times smaller than the Doppler broadening in the case of the D _2 line of rubidium and 15 time smaller than the Doppler broadening in the case of the D _1,2 lines of potassium. In magnetic fields B = 100−1200 G, all atomic lines of Rb and K atoms are spectrally resolved and identified. In the case of the D _2 line of Rb, it is demonstrated that the probabilities of magneto-induced transitions (^87Rb, F _ g = 1 → F _ e = 3 and ^85Rb, F _ g = 2 → F _ e = 4) can exceed the probabilities of the allowed transitions. Convenience and efficiency of the modified method of Faraday rotation for high-resolution spectroscopy is demonstrated.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

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