No. 33 (2004): Electron cloud effects and advanced and novel accelerators

Issue Editors: K.Ohmi and M. Furman, Editor-in-Chief: W. Chou

In this issue of the ICFA Beam Dynamics Newsletter, we have a special section (Section 2) dedicated to electron cloud effects in accelerators. Electron cloud effects were first studied in proton rings. Ion trapping and fast ion instability came later. Photoelectron emission due to synchrotron radiation became an important issue in positron rings during the past 10 years or so. Secondary electrons and multipactoring became important with increasing beam intensities. In the present concept of the electron cloud, many electrons are produced at the chamber wall and are widely distributed inside the chamber. Recently, electron cloud studies returned to proton rings. By now, many studies have been done in many types of accelerators, namely in positron storage rings (B-factories and damping rings of the LC’s), high intensity neutron sources (PSR, SNS and J-PARC), and high-energy hadron machines (RHIC and LHC). The electron cloud causes various types of instabilities and other undesirable phenomena. There are still many aspects to be studied on electron cloud effects. We hope, as editors, that this issue helps readers understand electron cloud effects and their importance.

Section 3 of this Newsletter contains a number of well written articles contributed by the ICFA Advanced and Novel Accelerators Panel. (Another set of articles from that Panel were published in the last issue, No. 32.)