Interferometer method using abel inversion to deduce a mapping of helium gas density and temperature

2015 ◽  
Vol 58 (2) ◽  
pp. 393-397 ◽  
Author(s):  
D. Benyahia ◽  
M. Lemerini
Keyword(s):  
Abel Inversion ◽  
Gas Density ◽  
Helium Gas ◽  
Interferometer Method

In-situ electrical-resistivity measurements in the high-voltage electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 68-69
Author(s):  
W. E. King
Keyword(s):  
Electrical Resistivity ◽  
Electron Microscope ◽  
High Voltage ◽  
Resistivity Measurements ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Wide Range ◽  
Helium Gas

A side-entry type, helium-temperature specimen stage that has the capability of in-situ electrical-resistivity measurements has been designed and developed for use in the AEI-EM7 1200-kV electron microscope at Argonne National Laboratory. The electrical-resistivity measurements complement the high-voltage electron microscope (HVEM) to yield a unique opportunity to investigate defect production in metals by electron irradiation over a wide range of defect concentrations.A flow cryostat that uses helium gas as a coolant is employed to attain and maintain any specified temperature between 10 and 300 K. The helium gas coolant eliminates the vibrations that arise from boiling liquid helium and the temperature instabilities due to alternating heat-transfer mechanisms in the two-phase temperature regime (4.215 K). Figure 1 shows a schematic view of the liquid/gaseous helium transfer system. A liquid-gas mixture can be used for fast cooldown. The cold tip of the transfer tube is inserted coincident with the tilt axis of the specimen stage, and the end of the coolant flow tube is positioned without contact within the heat exchanger of the copper specimen block (Fig. 2).

Activation of deionized water by atmospheric plasma jet in helium gas flow

2021 ◽  
Author(s):  
P. Y. Tan ◽  
O. H. Chin ◽  
R. Anpalagan ◽  
Y. T. Lau ◽  
H. C. Lee
Keyword(s):  
Gas Flow ◽  
Plasma Jet ◽  
Deionized Water ◽  
Atmospheric Plasma ◽  
Helium Gas
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