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Introductory Remarks

Beam Cooling is both a fascinating subject of investigations in accelerator physics and an indispensable tool to extend the luminosity and resolution of accelerator driven experiments.

Electron cooling was proposed by Budker in 1966 and experimentally proven by him and his collaborators in Novosibirsk in 1974. Stochastic Cooling was invented in 1968 by van der Meer and experimentally proven in 1975 at CERN. Its significance for physics was so far reaching that it earned him the Nobel Price together with C. Rubbia in the year 1984.

Since these pioneering days of ion beam cooling, the electron and the stochastic cooling have been implemented in several ion storage rings. Electron coolers with electron energies between 5 keV and 300 keV are quite common now in several storage rings all over the world. But in order to increase the luminosity in middle and high energy experiments the demand for cooling beyond today’s limits is growing. Investigations of electron cooling systems in the energy range from a few up to several tenth of MeV are changing the structure of electron cooling. This opens up a complete new field of technical developments as well as theoretical descriptions of electron cooling.

At present, stochastic cooling is only installed in four places worldwide (FNAL, GSI, CERN, COSY). Technical limits presently restrict the bandwidth of stochastic cooling systems to less than 10 GHz thus setting boundaries for further reducing the cooling time or increasing the number of ions to be cooled.

The Workshop on Beam Cooling and Related Topics 2001 took place in Bad Honnef in the time May 14th to May 18th, 2001. It continued the series of cooling workshops (Karlsruhe 1984, Legnaro 1990, Montreux 1993, Volga river 1996 and Uppsala 1999). 50 participants from seven nations (China, Germany, Japan, Russia, Sweden, Switzerland and USA) representing the 14 leading laboratories worldwide in the field of ion cooling gathered in the house of the German Physical Society.

The meeting in Bad Honnef emphasized that ion cooling is still a very active field of research and holds great promise for further substantial progress. The lively exchange of experience and the fruitful discussions that accompanied the talks given over a broad scope of topics will surely stimulate the field of ion phase space cooling. In this context we wish to express our thanks to all participants whose contributions made this meeting a success.

We also gratefully like to mention the cosy atmosphere in the house of the German Physical Society in Bad Honnef that contributed considerably to the open and enlightening discussions. Last not least, the organizers are deeply indebted to the WE-Heraeus foundation and the Forschungszentrum Jülich for their financial support as well as their brilliant organisation of the workshop.

Rudolf Maier and Dieter Prasuhn