Life-time evaluation of monolithic >MW peak power Nd:YAG/Cr:YAG ceramic microchip lasers

2021 ◽  
Author(s):  
Hwan Hong Lim ◽  
Takunori Taira
Keyword(s):  
Peak Power ◽  
Life Time ◽  
Microchip Lasers ◽  
Time Evaluation

Life time evaluation of PDMS stamps for UV-enhanced substrate conformal imprint lithography

2012 ◽  
Vol 98 ◽  
pp. 275-278 ◽  
Author(s):  
H. Schmitt ◽  
P. Duempelmann ◽  
R. Fader ◽  
M. Rommel ◽  
A.J. Bauer ◽  
...  
Keyword(s):  
Life Time ◽  
Imprint Lithography ◽  
Time Evaluation

Chamber Life Time Evaluation of a Regeneratively Cooled Thrust Chamber with Thermal Barrier Coatings

2017 ◽  
Author(s):  
Hiroaki Amakawa ◽  
Miki Nishimoto ◽  
Hideyo Negishi ◽  
Toshiya Kimura ◽  
Shin-ichi Moriya ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Life Time ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Thrust Chamber ◽  
Time Evaluation

Reliability and Life Time Evaluation Approach of the LE-X Engine

2011 ◽  
Author(s):  
Hideo Sunakawa ◽  
Miki Nishimoto ◽  
Nobuhiro Yamanishi ◽  
Keiichiro Noda ◽  
Eiichi Sato ◽  
...  
Keyword(s):  
Life Time ◽  
Evaluation Approach ◽  
Time Evaluation

SEM and Auger microanalysis studies of Cu-Be dynode surfaces at each activation condition

1978 ◽  
Vol 36 (1) ◽  
pp. 524-525
Author(s):  
T. Koshikawa ◽  
Y. Fujii ◽  
E. Sugata ◽  
F. Kanematsu
Keyword(s):  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Life Time ◽  
Activation Process ◽  
Beam Diameter ◽  
Activation Temperature ◽  
Electron Multiplier ◽  
Activation Condition ◽  
Activation Conditions

The Cu-Be alloys are widely used as the electron multiplier dynodes after the adequate activation process. But the structures and compositions of the elements on the activated surfaces were not studied clearly. The Cu-Be alloys are heated in the oxygen atmosphere in the usual activation techniques. The activation conditions, e.g. temperature and O2 pressure, affect strongly the secondary electron yield and life time of dynodes.In the present paper, the activated Cu-Be dynode surfaces at each condition are investigated with Scanning Auger Microanalyzer (SAM) (primary beam diameter: 3μmϕ) and SEM. The commercial Cu-Be(2%) alloys were polished with Cr2O3 powder, rinsed in the distilled water and set in the vacuum furnance.Two typical activation condition, i.e. activation temperature 730°C and 810°C in 5x10-3 Torr O2 pressure were chosen since the formation mechanism of the BeO film on the Cu-Be alloys was guessed to be very different at each temperature from the results of the secondary electron emission measurements.

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