Results 221 to 230 of about 17,119 (265)
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Nuclear Instruments and Methods in Physics Research, 1984
Abstract A UHV beam chopper has been designed at SSRL. It features incremental attenuation settings that can span a range of 30 db or more and is designed to handle up to 100 W input power. In this paper, the design of the chopper is outlined and discussed.
Roman Tatchyn, Richard Boyce
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Abstract A UHV beam chopper has been designed at SSRL. It features incremental attenuation settings that can span a range of 30 db or more and is designed to handle up to 100 W input power. In this paper, the design of the chopper is outlined and discussed.
Roman Tatchyn, Richard Boyce
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2015
To achieve the limiting pressure in an ultrahigh vacuum system, it is necessary to reduce the rate of desorption of molecules from the stainless steel walls to the lowest possible limit. These surface impurities originate from exposure of the walls to impurities during opening and processing of the system.
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To achieve the limiting pressure in an ultrahigh vacuum system, it is necessary to reduce the rate of desorption of molecules from the stainless steel walls to the lowest possible limit. These surface impurities originate from exposure of the walls to impurities during opening and processing of the system.
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2015
There are advantages in using aluminum UHV systems. For proton synchrotrons, the residual radioactivity produced in stainless systems may be reduced by one or two orders of magnitude, 100 h after machine shutdown, by employing Al instead of stainless steel.
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There are advantages in using aluminum UHV systems. For proton synchrotrons, the residual radioactivity produced in stainless systems may be reduced by one or two orders of magnitude, 100 h after machine shutdown, by employing Al instead of stainless steel.
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2015
As surface chemistry deals with more and more complex systems it has become necessary to work at high gas pressures as described elsewhere in this book. In addition, examples are available where work under liquids has been done while maintaining clean surfaces.
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As surface chemistry deals with more and more complex systems it has become necessary to work at high gas pressures as described elsewhere in this book. In addition, examples are available where work under liquids has been done while maintaining clean surfaces.
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2011
This document includes the optimization of substation connector geometries and protections for ± 800 kV DC and 1200 kV AC transmission systems. Connectors were obtained from SBI Connectors catalog using current geometries and materials. Parametric simulations have been carried out to determine the electric field on connectors surface as an indicator ...
Hernández Guiteras, Joan +1 more
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This document includes the optimization of substation connector geometries and protections for ± 800 kV DC and 1200 kV AC transmission systems. Connectors were obtained from SBI Connectors catalog using current geometries and materials. Parametric simulations have been carried out to determine the electric field on connectors surface as an indicator ...
Hernández Guiteras, Joan +1 more
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Towards optical levitation in UHV
2020Optically levitated particles in extreme vacuum conditions are an experimental platform that may enable the generation of extended quantum states on unprecedented mass scales above 1E8 amu. Their interactions with blackbody radiation will intrinsically limit the lifetime of such states.
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