Reference design for the Fermilab linac upgrade

Fermilab plans to increase the energy of its H- linac from 200 to 400 MeV as part of a program to enhance the operation of the Tevatron for both collider and fixed target operation. The principal motivation for the linac upgrade is to reduce the incoherent spacecharge tuneshift at injection into the booster synchrotron. Other parts of the program are required to fully exploit the linac upgrade, but immediate improvement should be seen in booster performance with consequent benefit for collider luminosity and probably fixed target intensity as well. Improved diagnostic and beam steering capabilities and the elimination of some of the obsolete triode power amplifiers are expected to lead to improved reliability and consistency in linac operation. The upgrade design has been presented in a conceptual design report. This paper treats the current evolution of the general design and principal parameters of the linac with little reference to components, supporting systems, conventional facilities, etc. 13 refs., 5 figs., 1 tab