8 research outputs found
High-intensity cesium ion beams for HIBP diagnostics
The goal of the research is to expand the capabilities of the heavy ion beam probing (HIBP) diagnostic. HIBP is a unique diagnostic, capable to measure plasma potential, density and their fluctuations, as well as the poloidal magnetic field fluctuations in the core and edge plasmas. The sensitivity of the diagnostic is determined by the level of the output signal related to the instrumental noise. The level of the probing beam current should be as high as possible, especially for measurements at the periphery with low output signal due to low plasma density, and in the core, where the beam is attenuated due to the high plasma density. Optimization experiments have shown the possibility of ion beam forming in the current range from 40 to 800 ΞΌA.ΠΠ΅ΡΠ° Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ β ΡΠΎΠ·ΡΠΈΡΠΈΡΠΈ ΠΌΠΎΠΆΠ»ΠΈΠ²ΠΎΡΡΡ Π΄ΡΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ Π·Π° Π΄ΠΎΠΏΠΎΠΌΠΎΠ³ΠΎΡ Π·ΠΎΠ½Π΄ΡΠ²Π°Π½Π½Ρ ΠΏΠ»Π°Π·ΠΌΠΈ ΠΏΡΡΠΊΠΎΠΌ Π²Π°ΠΆΠΊΠΈΡ
ΡΠΎΠ½ΡΠ² (ΠΠΠΠΠ). ΠΠΠΠΠ β ΡΠ΅ ΡΠ½ΡΠΊΠ°Π»ΡΠ½Π° Π΄ΡΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ°, Π·Π΄Π°ΡΠ½Π° Π²ΠΈΠΌΡΡΡΠ²Π°ΡΠΈ ΠΏΠΎΡΠ΅Π½ΡΡΠ°Π», Π³ΡΡΡΠΈΠ½Ρ ΠΏΠ»Π°Π·ΠΌΠΈ Ρ ΡΡ
ΡΠ»ΡΠΊΡΡΠ°ΡΡΡ, Π° ΡΠ°ΠΊΠΎΠΆ ΡΠ»ΡΠΊΡΡΠ°ΡΡΡ ΠΏΠΎΠ»ΠΎΡΠ΄Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°Π³Π½ΡΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ Π² ΡΠ΅Π½ΡΡΡ ΡΠ° ΠΏΠ΅ΡΠΈΡΠ΅ΡΡΡ ΠΏΠ»Π°Π·ΠΌΠΈ. Π§ΡΡΠ»ΠΈΠ²ΡΡΡΡ Π΄ΡΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ Π²ΠΈΠ·Π½Π°ΡΠ°ΡΡΡΡΡ ΡΡΠ²Π½Π΅ΠΌ Π²ΠΈΡ
ΡΠ΄Π½ΠΎΠ³ΠΎ ΡΠΈΠ³Π½Π°Π»Ρ, ΡΠΎΠ΄ΠΎ ΡΠ½ΡΡΡΡΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΡΠΌΡ. Π ΡΠ²Π΅Π½Ρ ΡΡΡΡΠΌΡ Π·ΠΎΠ½Π΄ΡΠ²Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΡΠΊΠ° ΠΏΠΎΠ²ΠΈΠ½Π΅Π½ Π±ΡΡΠΈ ΡΠΊΠΎΠΌΠΎΠ³Π° Π±ΡΠ»ΡΡ Π²ΠΈΡΠΎΠΊΠΈΠΌ, ΠΎΡΠΎΠ±Π»ΠΈΠ²ΠΎ Π΄Π»Ρ Π²ΠΈΠΌΡΡΡΠ²Π°Π½Ρ Π½Π° ΠΏΠ΅ΡΠΈΡΠ΅ΡΡΡ Π· Π½ΠΈΠ·ΡΠΊΠΈΠΌ Π²ΠΈΡ
ΡΠ΄Π½ΠΈΠΌ ΡΠΈΠ³Π½Π°Π»ΠΎΠΌ ΡΠ΅ΡΠ΅Π· Π½ΠΈΠ·ΡΠΊΡ Π³ΡΡΡΠΈΠ½Ρ ΠΏΠ»Π°Π·ΠΌΠΈ, Π° ΡΠ°ΠΊΠΎΠΆ Ρ ΡΠ΅Π½ΡΡΡ, Π΄Π΅ ΠΏΡΡΠΎΠΊ ΠΏΠΎΡΠ»Π°Π±Π»ΡΡΡΡΡΡ ΡΠ΅ΡΠ΅Π· Π²ΠΈΡΠΎΠΊΡ Π³ΡΡΡΠΈΠ½Ρ ΠΏΠ»Π°Π·ΠΌΠΈ. ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠΈ Π· ΠΎΠΏΡΠΈΠΌΡΠ·Π°ΡΡΡ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ ΠΌΠΎΠΆΠ»ΠΈΠ²ΡΡΡΡ ΡΠΎΡΠΌΡΠ²Π°Π½Π½Ρ ΡΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΡΠΊΠ° Π² Π΄ΡΠ°ΠΏΠ°Π·ΠΎΠ½Ρ ΡΡΡΡΠΌΡ 40β¦800 ΠΌΠΊΠ.Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β ΡΠ°ΡΡΠΈΡΠΈΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ Ρ ΠΏΠΎΠΌΠΎΡΡΡ Π·ΠΎΠ½Π΄ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠ»Π°Π·ΠΌΡ ΠΏΡΡΠΊΠΎΠΌ ΡΡΠΆΠ΅Π»ΡΡ
ΠΈΠΎΠ½ΠΎΠ² (ΠΠΠΠ’Π). ΠΠΠΠ’Π β ΡΡΠΎ ΡΠ½ΠΈΠΊΠ°Π»ΡΠ½Π°Ρ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ°, ΡΠΏΠΎΡΠΎΠ±Π½Π°Ρ ΠΈΠ·ΠΌΠ΅ΡΡΡΡ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π», ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΡ ΠΏΠ»Π°Π·ΠΌΡ ΠΈ ΠΈΡ
ΡΠ»ΡΠΊΡΡΠ°ΡΠΈΠΈ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠ»ΡΠΊΡΡΠ°ΡΠΈΠΈ ΠΏΠΎΠ»ΠΎΠΈΠ΄Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ Π² ΡΠ΅Π½ΡΡΠ΅ ΠΈ ΠΏΠ΅ΡΠΈΡΠ΅ΡΠΈΠΈ ΠΏΠ»Π°Π·ΠΌΡ. Π§ΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ ΡΡΠΎΠ²Π½Π΅ΠΌ Π²ΡΡ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠΈΠ³Π½Π°Π»Π° ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΈΠ½ΡΡΡΡΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΡΠΌΠ°. Π£ΡΠΎΠ²Π΅Π½Ρ ΡΠΎΠΊΠ° Π·ΠΎΠ½Π΄ΠΈΡΡΡΡΠ΅Π³ΠΎ ΠΏΡΡΠΊΠ° Π΄ΠΎΠ»ΠΆΠ΅Π½ Π±ΡΡΡ ΠΊΠ°ΠΊ ΠΌΠΎΠΆΠ½ΠΎ Π±ΠΎΠ»Π΅Π΅ Π²ΡΡΠΎΠΊΠΈΠΌ, ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎ Π΄Π»Ρ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ Π½Π° ΠΏΠ΅ΡΠΈΡΠ΅ΡΠΈΠΈ Ρ Π½ΠΈΠ·ΠΊΠΈΠΌ Π²ΡΡ
ΠΎΠ΄Π½ΡΠΌ ΡΠΈΠ³Π½Π°Π»ΠΎΠΌ ΠΈΠ·-Π·Π° Π½ΠΈΠ·ΠΊΠΎΠΉ ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ ΠΏΠ»Π°Π·ΠΌΡ, Π° ΡΠ°ΠΊΠΆΠ΅ Π² ΡΠ΅Π½ΡΡΠ΅, Π³Π΄Π΅ ΠΏΡΡΠΎΠΊ ΠΎΡΠ»Π°Π±Π»ΡΠ΅ΡΡΡ ΠΈΠ·-Π·Π° Π²ΡΡΠΎΠΊΠΎΠΉ ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ ΠΏΠ»Π°Π·ΠΌΡ. ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΡ ΠΏΠΎ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΡΠΊΠ° Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΡΠΎΠΊΠ° 40β¦800 ΠΌΠΊΠ
A dual heavy ion beam probe diagnostic on the TJ-II stellarator
The aim of the report is to show the development of HIBP diagnostics on the TJ-II stellarator and, as a result, the expansion of the range of plasma parameters measurements. The first Heavy Ion Beam Probe (HIBP-1) diagnostic is being used on TJ-II stellarator since 2000. It has been shown significant progress in the measurements of plasma profiles and oscillations. The second HIBP-2 system was installed on TJ-II in 2012. Dual HIBP system, consisting of two identical HIBP-1 and HIBP-2 located ΒΌ torus apart, provides the measurement of the long-range correlations of plasma parameters in the full plasma column. Low noise high gain (10β· V/A) preamplifiers with 1 Hz bandwidth sampling is used. They allow to study broadband turbulence and quasi-coherent modes like geodesic acoustic modes, Alfven eigenmodes, suprathermal electron induced modes, etc. New capabilities of the dual HIBP diagnostic in plasma potential and density investigations were demonstrated on TJ-II stellarator in the measurements of the correlation between fluctuations in different poloidal and toroidal locations: on the same field line, on the same magnetic surface or on different magnetic surfaces at different points, separated toroidally and/or poloidally.ΠΠ° ΡΡΠ΅Π»Π°ΡΠ°ΡΠΎΡΡ TJ-II ΡΡΠ²ΠΎΡΠ΅Π½Π° ΠΏΠΎΠ΄Π²ΡΠΉΠ½Π° ΡΠΈΡΡΠ΅ΠΌΠ° Π·ΠΎΠ½Π΄ΡΠ²Π°Π½Π½Ρ ΠΏΠ»Π°Π·ΠΌΠΈ ΠΏΡΡΠΊΠΎΠΌ Π²Π°ΠΆΠΊΠΈΡ
ΡΠΎΠ½ΡΠ² (ΠΠΠΠΠ). Π‘ΠΈΡΡΠ΅ΠΌΠ° ΡΠΊΠ»Π°Π΄Π°ΡΡΡΡΡ Π· Π΄Π²ΠΎΡ
ΡΠ΄Π΅Π½ΡΠΈΡΠ½ΠΈΡ
ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΠ², ΡΠΎΠ·ΡΠ°ΡΠΎΠ²Π°Π½ΠΈΡ
Π½Π° Π²ΡΠ΄ΡΡΠ°Π½Ρ ΒΌ ΡΠΎΡΠ°. ΠΠ΅ΡΡΠΈΠΉ Π΄ΡΠ°Π³Π½ΠΎΡΡΠΈΡΠ½ΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ ΠΏΠΎΡΠ°Π² Π΄ΡΡΡΠΈ Π² 2000 ΡΠΎΡΡ. ΠΡΡΠ³ΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ Π±ΡΠ² Π²ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΠΉ Π² 2012 ΡΠΎΡΡ. ΠΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ ΠΏΡΠ΄ΡΠΈΠ»ΡΠ²Π°ΡΡΠ² Π΄Π΅ΡΠ΅ΠΊΡΠΎΡΠ½ΠΈΡ
ΡΠΈΠ³Π½Π°Π»ΡΠ² Π· Π½ΠΈΠ·ΡΠΊΠΈΠΌ ΡΡΠ²Π½Π΅ΠΌ ΡΡΠΌΡ (10β· Π/A) Π· ΠΏΡΠΎΠΏΡΡΠΊΠ½ΠΎΡ Π·Π΄Π°ΡΠ½ΡΡΡΡ 1 ΠΠΡ Π΄ΠΎΠ·Π²ΠΎΠ»ΡΡ Π²ΠΈΠ²ΡΠ°ΡΠΈ ΡΠΈΡΠΎΠΊΠΎΡΠΌΡΠ³ΠΎΠ²Ρ ΡΡΡΠ±ΡΠ»Π΅Π½ΡΠ½ΡΡΡΡ ΡΠ° ΠΊΠ²Π°Π·ΡΠΊΠΎΠ³Π΅ΡΠ΅Π½ΡΠ½Ρ ΡΠ΅ΠΆΠΈΠΌΠΈ, ΡΠ°ΠΊΡ ΡΠΊ Π³Π΅ΠΎΠ΄Π΅Π·ΠΈΡΠ½Ρ Π°ΠΊΡΡΡΠΈΡΠ½Ρ ΠΌΠΎΠ΄ΠΈ; Π°Π»ΡΡΠ²Π΅Π½ΡΠ²ΡΡΠΊΡ ΠΌΠΎΠ΄ΠΈ; ΡΡΠΏΠ΅ΡΡΠ΅ΡΠΌΠ°Π»ΡΠ½Ρ ΠΌΠΎΠ΄ΠΈ, ΡΠΊΡ Π·Π±ΡΡΡΡΡΡΡΡ ΡΠ²ΠΈΠ΄ΠΊΠΈΠΌΠΈ Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π°ΠΌΠΈ, ΡΠΎΡΠΎ. ΠΠΎΠ²Ρ ΠΌΠΎΠΆΠ»ΠΈΠ²ΠΎΡΡΡ ΠΏΠΎΠ΄Π²ΡΠΉΠ½ΠΎΡ ΡΠΈΡΡΠ΅ΠΌΠΈ Π±ΡΠ»ΠΈ ΠΏΡΠΎΠ΄Π΅ΠΌΠΎΠ½ΡΡΡΠΎΠ²Π°Π½Ρ ΠΏΡΠΈ Π²ΠΈΠΌΡΡΡΠ²Π°Π½Π½ΡΡ
Π΄Π°Π»Π΅ΠΊΠΈΡ
ΠΊΠΎΡΠ΅Π»ΡΡΡΠΉ ΠΌΡΠΆ ΡΠ»ΡΠΊΡΡΠ°ΡΡΡΠΌΠΈ Π² ΡΡΠ·Π½ΠΈΡ
ΠΏΠΎΠ»ΠΎΡΠ΄Π°Π»ΡΠ½ΠΈΡ
ΡΠ° ΡΠΎΡΠΎΡΠ΄Π°Π»ΡΠ½ΠΈΡ
ΠΌΡΡΡΡΡ
: Π½Π° ΠΎΠ΄Π½ΡΠΉ Π»ΡΠ½ΡΡ ΠΌΠ°Π³Π½ΡΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ, Π½Π° ΠΎΠ΄Π½ΡΠΉ Π°Π±ΠΎ Π½Π° ΡΡΠ·Π½ΠΈΡ
ΠΌΠ°Π³Π½ΡΡΠ½ΠΈΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΡΡ
Ρ ΡΡΠ·Π½ΠΈΡ
ΡΠΎΡΠΊΠ°Ρ
, ΡΠΎΠ·ΡΠ°ΡΠΎΠ²Π°Π½ΠΈΡ
ΡΠΎΡΠΎΡΠ΄Π°Π»ΡΠ½ΠΎ ΡΠ°/Π°Π±ΠΎ ΠΏΠΎΠ»ΠΎΡΠ΄Π°Π»ΡΠ½ΠΎ.ΠΠ° ΡΡΠ΅Π»Π»Π°ΡΠ°ΡΠΎΡΠ΅ TJ-II ΡΠΎΠ·Π΄Π°Π½Π° Π΄Π²ΠΎΠΉΠ½Π°Ρ ΡΠΈΡΡΠ΅ΠΌΠ° Π·ΠΎΠ½Π΄ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠ»Π°Π·ΠΌΡ ΠΏΡΡΠΊΠΎΠΌ ΡΡΠΆΠ΅Π»ΡΡ
ΠΈΠΎΠ½ΠΎΠ² (ΠΠΠΠ’Π). Π‘ΠΈΡΡΠ΅ΠΌΠ° ΡΠΎΡΡΠΎΠΈΡ ΠΈΠ· Π΄Π²ΡΡ
ΠΈΠ΄Π΅Π½ΡΠΈΡΠ½ΡΡ
ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΎΠ², ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½ΡΡ
Π½Π° ΡΠ°ΡΡΡΠΎΡΠ½ΠΈΠΈ ΒΌ ΡΠΎΡΠ°. ΠΠ΅ΡΠ²ΡΠΉ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ Π½Π°ΡΠ°Π» Π΄Π΅ΠΉΡΡΠ²ΠΎΠ²Π°ΡΡ Π² 2000 Π³ΠΎΠ΄Ρ. ΠΡΠΎΡΠΎΠΉ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ Π±ΡΠ» ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ Π² 2012 Π³ΠΎΠ΄Ρ. ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠΈΠ»ΠΈΡΠ΅Π»Π΅ΠΉ Π΄Π΅ΡΠ΅ΠΊΡΠΎΡΠ½ΡΡ
ΡΠΈΠ³Π½Π°Π»ΠΎΠ² Ρ Π½ΠΈΠ·ΠΊΠΈΠΌ ΡΡΠΎΠ²Π½Π΅ΠΌ ΡΡΠΌΠ° (10β· Π/A) ΠΈ ΠΏΠΎΠ»ΠΎΡΠΎΠΉ ΠΏΡΠΎΠΏΡΡΠΊΠ°Π½ΠΈΡ 1 ΠΠΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΈΠ·ΡΡΠ°ΡΡ ΡΠΈΡΠΎΠΊΠΎΠΏΠΎΠ»ΠΎΡΠ½ΡΡ ΡΡΠ±ΡΠ»Π΅Π½ΡΠ½ΠΎΡΡΡ ΠΈ ΠΊΠ²Π°Π·ΠΈΠΊΠΎΠ³Π΅ΡΠ΅Π½ΡΠ½ΡΠ΅ ΠΌΠΎΠ΄Ρ, ΡΠ°ΠΊΠΈΠ΅ ΠΊΠ°ΠΊ Π³Π΅ΠΎΠ΄Π΅Π·ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠΎΠ΄Ρ; Π°Π»ΡΡΠ²Π΅Π½ΠΎΠ²ΡΠΊΠΈΠ΅ ΡΠΎΠ±ΡΡΠ²Π΅Π½Π½ΡΠ΅ ΠΌΠΎΠ΄Ρ; ΠΌΠΎΠ΄Ρ, ΠΈΠ½Π΄ΡΡΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ Π½Π°Π΄ΡΠ΅ΠΏΠ»ΠΎΠ²ΡΠΌΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π°ΠΌΠΈ ΠΈ Ρ.Π΄. ΠΠΎΠ²ΡΠ΅ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ Π΄Π²ΠΎΠΉΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ Π±ΡΠ»ΠΈ ΠΏΡΠΎΠ΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΡΠΈ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡΡ
Π΄Π°Π»ΡΠ½ΠΈΡ
ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΉ ΠΌΠ΅ΠΆΠ΄Ρ ΡΠ»ΡΠΊΡΡΠ°ΡΠΈΡΠΌΠΈ, ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½Π½ΡΠΌΠΈ Π² ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΏΠΎΠ»ΠΎΠΈΠ΄Π°Π»ΡΠ½ΠΈΡ
ΠΈ ΡΠΎΡΠΎΠΈΠ΄Π°Π»ΡΠ½ΡΡ
ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΡΡ
: Π½Π° ΠΎΠ΄Π½ΠΎΠΉ ΠΈΠ»ΠΈ Π½Π° ΡΠ°Π·Π½ΡΡ
ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡΡ
, Π² ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠΎΡΠΊΠ°Ρ
, ΡΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
ΡΠΎΡΠΎΠΈΠ΄Π°Π»ΡΠ½ΠΎ ΠΈ/ΠΈΠ»ΠΈ ΠΏΠΎΠ»ΠΎΠΈΠ΄Π°Π»ΡΠ½ΠΎ
Changing trends in mortality among solid organ transplant recipients hospitalized for COVID-19 during the course of the pandemic
Mortality among patients hospitalized for COVID-19 has declined over the course of the pandemic. Mortality trends specifically in solid organ transplant recipients (SOTR) are unknown. Using data from a multicenter registry of SOTR hospitalized for COVID-19, we compared 28-day mortality between early 2020 (March 1, 2020βJune 19, 2020) and late 2020 (June 20, 2020βDecember 31, 2020). Multivariable logistic regression was used to assess comorbidity-adjusted mortality. Time period of diagnosis was available for 1435/1616 (88.8%) SOTR and 971/1435 (67.7%) were hospitalized: 571/753 (75.8%) in early 2020 and 402/682 (58.9%) in late 2020 (p <.001). Crude 28-day mortality decreased between the early and late periods (112/571 [19.6%] vs. 55/402 [13.7%]) and remained lower in the late period even after adjusting for baseline comorbidities (aOR 0.67, 95% CI 0.46β0.98, p =.016). Between the early and late periods, the use of corticosteroids (β₯6 mg dexamethasone/day) and remdesivir increased (62/571 [10.9%] vs. 243/402 [61.5%], p <.001 and 50/571 [8.8%] vs. 213/402 [52.2%], p <.001, respectively), and the use of hydroxychloroquine and IL-6/IL-6 receptor inhibitor decreased (329/571 [60.0%] vs. 4/492 [1.0%], p <.001 and 73/571 [12.8%] vs. 5/402 [1.2%], p <.001, respectively). Mortality among SOTR hospitalized for COVID-19 declined between early and late 2020, consistent with trends reported in the general population. The mechanism(s) underlying improved survival require further study
Shifts in the community composition of caddisflies (Insecta: Trichoptera) in a subtropical river over three decades
Clinical experience with severe 2009 H1N1 influenza in the intensive care unit at King Saud Medical City, Saudi Arabia
Increasing sorghum yields by seed treatment with an aqueous extract of the plant Eclipta alba may involve a dual mechanism of hydropriming and suppression of fungal pathogens
Tests of ecological hypotheses in intertidal estuarine assemblages
The International Association of Gerontology and Geriatrics held its first conference on nursing home research in St Louis, MO, in November 2013. This article provides a summary of the presentations