## What does VacTran do?

Calculates the pump down time of a vacuum system, with and without gas loads

Models conductance elements such as pipes and elbows, and determine their effect on the delivered speed of the system

Models raw data conductance elements representing conductance vs. pressure

Calculates the rate of pressure rise for a vacuum vessel based on its gas load

Models vacuum pumps and raw data gas loads with full editing features, including a pump curve digitizer utility

Models surface outgassing, permeations, and leaks, and calculate the rate of rise for a vacuum vessel

Graphs a multitude of vacuum system calculations with flexible plotting parameters that are easily changed

Creates professional-looking graphs that can be used in publications or presentations or saved in standard graphics formats

Models conductance elements such as pipes and elbows, and determine their effect on the delivered speed of the system

Models raw data conductance elements representing conductance vs. pressure

Calculates the rate of pressure rise for a vacuum vessel based on its gas load

Models vacuum pumps and raw data gas loads with full editing features, including a pump curve digitizer utility

Models surface outgassing, permeations, and leaks, and calculate the rate of rise for a vacuum vessel

Graphs a multitude of vacuum system calculations with flexible plotting parameters that are easily changed

Creates professional-looking graphs that can be used in publications or presentations or saved in standard graphics formats

## Typical applications

Particle accelerators
Semiconductor production systems Infrared spectroscopy Space simulation chambers High-power laser systems Sputter coating systems Freeze drying equipment |
Scanning electroscopy
Uranium enrichment chambers Physical vapor deposition Plasma electrode Pockels cells Fusion target chambers Pump manufacturers Vacuum furnaces |

## Core function: the System Model

**Pump stations:**one or more pumps working in parallel, plus one or more conductance elements in series. A system model can have up to six pump stations. A pump station can have an unlimited number of pumps and conductances.

**Pumps:**independent model files referenced by the pump station. Each pump model contains pump speed vs pressure information.

**Conductance elements:**piping components that have specific flow characteristics associated with their geometry.

**Gas Loads:**Gas Load elements are either parametric (calculated) or raw data (provided by user). Examples of parametric gas loads are permeation and out gas models. A system model can have unlimited gas load elements.

## Vacuum System calculations

VacTran creates graph output of vacuum system performance with numerous options.

## What does VacTran __not__ do?

Perform safety-related calculations, such as vessel structural stress or buckling

Draw CAD-like renderings of vacuum systems

Provide data acquisition or control interfaces with hardware (such as pressure gages)

Perform Monte-Carlo modeling or Computational Fluid Dynamics modeling

Calculate conductance of arbitrary, free form geometries

Model complex networks of piping or multiple vacuum vessels

Calculate back pressure effects at the exhaust side of vacuum pumps

Draw CAD-like renderings of vacuum systems

Provide data acquisition or control interfaces with hardware (such as pressure gages)

Perform Monte-Carlo modeling or Computational Fluid Dynamics modeling

Calculate conductance of arbitrary, free form geometries

Model complex networks of piping or multiple vacuum vessels

Calculate back pressure effects at the exhaust side of vacuum pumps