Joint CARE-ELAN, CARE-HHH-APD, and EUROTEV-WP3 Workshop on Electron Cloud Clearing

This report contains the Proceedings of the joint CARE-HHH-APD, CARE-ELAN, and EUROTEV-WP3 Mini-Workshop on 'Electron Cloud Clearing - Electron Cloud and Technical Consequences', "ECL2", held at CERN in Geneva, Switzerland, 1-2 March 2007). The ECL2 workshop explored novel technological remedies against electron-cloud formation in an accelerator beam pipe. A primary motivation for the workshop was the expected harmful electron-cloud effects in the upgraded LHC injectors and in future linear colliders, as well as recent beam observations in operating facilities like ANKA, CESR, KEKB, RHIC, and SPS. The solutions discussed at ECL2 included enamel-based clearing electrodes, slotted vacuum chambers, NEG coating, and grooves. Several of the proposed cures were assessed in terms of their clearing efficiency and the associated beam impedance. The workshop also reviewed new simulation tools like the 3D electron-ion build-up 'Faktor', modeling assumptions, analytical calculations, beam experiments, and laboratory measurements. Several open questions could be identified. The workshop reinforced inter-laboratory collaboration on electron-cloud suppression, and it concluded with a discussion of the next steps to be taken

Fast switching devices and induction rf at CLIC

We survey possible applications of fast switching devices and induction rf at the Compact Linear Collider (CLIC). These applications include extraction kickers for the combiner rings, modulators for the drive-beam linac, fast intra-train feedback, induction crab cavities, halo kickers, emergency kickers, long-range beam-beam compensation, damping-ring barrier rf, pulsed linac wigglers, positron capture, and spent-beam handling

Gotteslob Dienstebuch

Das Buch bietet denen, die Verantwortung für das gottesdienstliche Leben in den Gemeinden Verantwortung tragen, eine Hilfe, die Möglichkeiten des neuen Gebet- und Gesangbuches "Gotteslob" für die gottesdienstlichen Feiern (bes. Andachten, Tagzeitenliturgie, Wort-Gottes-Feier) vielfältig zu nutzen. Dem dient die Zusammenstellung von Feiermodellen, Gestaltungshinweisen, Texten, Gebeten und Gesangsvorlagen

Measurements of the LHC Collimator Impedance with Beam in the SPS

The transverse impedance of the LHC collimators will likely dominate the overall transverse impedance in the LHC at high energies and potentially limit the maximum intensity. A prototype collimator was recently tested in the SPS. Small, but significant tune shifts depending on the collimator position have been observed using different independent high resolution tune measurement methods. In addition trapped modes predicted from numerical simulation at the ends of the collimator jaws have been identified by bench measurement techniques as well as with the beam. We present a description of the measurements and an analysis of the results