Longitudinal focusing and acceleration are performed by RF electric fields in cavity resonators. The topic of ``Beam Loading'' denotes all the phenomena encompassed by ``the cavity is driven by two current sources: (i) the generator and (ii) the beam''. The range of beam loading phenomena includes: steady-state phase and amplitude shift of voltage due to reactive beam-component, periodic transients, injection/accumulation transients, coupled-bunch instabilities, and power-limited (i.e. Robinson) instability. A review of theory and state-of-art applications was given at 7th ICFA Mini-Workshop held at KEK-Tanashi in February 1998. There was also some reporting of phenomena at the 9th ICFA Mini-Workshop held in Geneva, March 2000. I shall speak about developments in three areas after the 1998 workshop.
- Introduction of Magnetic Alloy (e.g. Finemet) cores and adoption of low Q cavities.
- e+e- factories with very large beam current (e.g. KEKB, PEP II).
- Developments at p,p factories (e.g. LHC), and simulation codes.
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