Report of VLHC Instability Workshop SLAC , March 21 - 23 , 2001

Electron - Cloud Instability in the VLHC 1

Over a few bunch passages photoemission and secondary emission could generate a quasi-stationary electron-cloud in the VLHC beam pipe, giving rise to a multi-bunch instability. In this paper, we report preliminary simulation results of the electron cloud build-up and its response to a beam displacement. The estimated instability rise time is about 3{4 s in both transverse planes.

Electron-Cloud Instability and Beam-Induced Multipacting in the LHC and in the VLHC*

fin the beam pipe of the Large Hadron Collider (LHC), photoemission and secondary emission give rise to a quasistationary electron cloud, which is established after a few bunch passages. The response of this electron cloud to a transversely displaced bunch resembles a short-range wakefield and can cause a fast instability [l]. In addition, beam-induced multipacting of the electrons may lead to ...

Magnets for the Very Large Hadron Collider

Early in 1998, a steering committee was set up in the U.S. to look at a proton-proton collider with center of mass energy signi cantly above that of the LHC. The steering committee was set up in response to one of the recommendations of the 1997-1998 HEPAP Subpanel report on the future of U.S. High Energy Physics. The steering committee chose a temporary name for the machine, very large hadron ...

Status of PEP-II and BaBar

The SLAC B Factory was approved by President Clinton in October 1993. The inaugural meeting of the detector collaboration was held at SLAC in December 1993, at which time the 9 nation BaBar collaboration began. First funding for the machine construction was released in January 1994, launching the SLAC/LBNL/LLNL PEP-II project collaboration [1]. The detector technical design report was completed...

On Transverse Mode Coupling Instability in VLHC