  This lecture introduces major physics and technology aspects of accelerator
vacuum systems. Following an introduction, in the second section generic vacuum
quantities such as pressure, gas density, the gas equation, pumping speed,
conductance are introduced. Since accelerators typically have lengthy vacuum
tubes, one-dimensional calculation is in many cases sufficient to compute a
pressure profile for an accelerator, and methods for doing so are developed in
the next section. In the fourth section accelerator specific aspects of vacuum
are considered. This includes lifetime limiting effects for the particle beam,
such as bremsstrahlung, elastic and inelastic scattering. Requirements for
vacuum properties are derived. In the fifth section types of components and
suitable materials for accelerator vacuum systems are described. Such
components are for example flange systems, vacuum chambers for accelerators and
the different types of pumps.
