VACUUM SCIENCE BLOG

Global vacuum conferences — A status update as of April 2021

Many vacuum conferences scheduled for 2020 were either cancelled, postponed to 2021, or shifted online. Unfortunately, we’re still in the grips of the COVID-19 pandemic, and even conferences postponed by a full year are facing further postponement or cancellation.

Here’s a quick status update on some of the most important conferences related to vacuum technology and its applications:

 

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New UHV/XHV pumps at ALBA Synchrotron & Argonne Laboratory

In this blog post, we share some recent installations of UHV/XHV pump technologies in electron synchrotrons and how these special pumps perform.

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The Working Principle of Multistage Roots Vacuum Pumps

Fore vacuum pumps are defined as those which exhaust to atmospheric pressure. They are also required to support secondary pumps or to attain the initial conditions for their operation. There are two types of fore vacuum pumps:

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Key working principles of fore vacuum pumps

Fore vacuum pumps are defined as those which exhaust to atmospheric pressure. They are also required to support secondary pumps or to attain the initial conditions for their operation. There are two types of fore vacuum pumps:

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How Vacuum Technology Supports COVID-19 Vaccine Efficacy

The storage and transport of COVID-19 vaccines has to be managed in a cold chain, with the first approved vaccine by Pfizer-BioNtech requiring storage temperatures of -70 C. Besides using dry ice (solid carbon dioxide at -75.8 C), Vacuum Insulated Panels and vacuum insulation have become attractive solutions.

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The key working principles of High and Ultra-High vacuum pumps

High Vacuum (HV) and Ultra-High Vacuum (UHV) levels can only be effectively and efficiently obtained by using a main pump that has the functional capabilities. Choosing which pump to use depends on a number of factors, such as noise/vibration, cost (initial and on-going), tolerance to contamination, footprint, maintenance schedules, and resilience to shock.

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Introduction to Vacuum Coating by Thermal Evaporation

In our previous blog post, Introduction to Vacuum Coating Technology, we shared various PVD (Physical Vapor Deposition) methods and showed typical products being coated using vacuum technologies. Thin films can be adhered to metal, glass, plastics, ceramics, or paper. In this blog post we will focus on Thermal Evaporation techniques.

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How to reduce outgassing in vacuum systems

 

This blog is based on the article in Applied Science and Convergence Technology 26 (5): 95-109 (2017) R Grinham and A Chew.

There are four main ways you can reduce outgassing in your vacuum system. These are: cleaning and handling, surface treatment, passivation, and purging and backfilling. In this blog, we will take a closer look at each of these methods. 

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Introduction to outgassing

 

This blog is based on the article in Applied Science and Convergence Technology 26 (5): 95-109 (2017) R Grinham and A Chew.

There are several contributions to the gas load of a system. At pressures below ~0.1 mbar, the most dominant is often ‘outgassing’. Outgassing is the result of desorption of previously adsorbed molecules, bulk diffusion, permeation and vapourisation. Adsorption occurs via two main processes, physisorption and chemisorption, and can be described using five (or six) classifying isotherms. 

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When to Use Direct vs Indirect Gauges

 

Measuring vacuum pressure is a fundamental element of all vacuum applications, but there’s no such thing as a universal vacuum gauge.

When it comes to measuring vacuum pressure, no single gauge will respond accurately throughout the entire vacuum range (from atmospheric pressure to 10-12 mbar). That’s why a clear understanding of the differences between the types of gauges is essential to match them to the right operational contexts. 

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