Main Linac Single Bunch Emittance Preservation in the NLC and USColdLC Configurations

Effectiveness of Emittance Bumps in the NLC and USColdLC Main Linear Accelerators

We report on a series of studies on the effectiveness of closed orbit bumps in the linacs of the NLC and the USColdLC. In the first study, emittance dilutions of a pure-wakefield or pure-dispersion character are introduced in each linac, and a set of emittance bumps is tested to determine the most effective bump location in the linac, and the net effectiveness. In the second study, a more reali...

Beam-Based Alignment of the NLC Main Linac, Part One: Single-Bunch Comparative Study of Three Algorithms

We describe the results of a series of simulation studies of beam-based alignment of the NLC main linacs using the program LIAR. Three algorithms for alignment of quadrupoles and girders are considered: the algorithm used in the ZDR, the ZDR algorithm combined with a post-alignment MICADO operation, and an algorithm which requires no steering dipoles but requires twice as many alignment segment...

A Compact X-band Linac for an X-ray Fel*

With the growing demand for FEL light sources, cost issues are being reevaluated. To make the machines more compact, higher frequency room temperature linacs are being considered, specifically ones using C-band (5.7 GHz) rf technology, for which 40 MV/m gradients are achievable. In this paper, we show that an X-band (11.4 GHz) linac using the technology developed for NLC/GLC can provide an even...

Issues in Multi-Bunch Emittance Preservation in the NLC

The next Linear Collider Machine Protection System

The Next Linear Collider (NLC) electron and positron beams are capable of damaging the linac accelerating structure and beamline vacuum chambers during an individual aberrant accelerator pulse. Machine protection system (MPS) considerations, outlined in this paper for the 1 TeV NLC design, have an impact on the engineering and design of most machine components downstream of the damping ring inj...