R. Garoby

Accelerator design concept for future neutrino facilities

This document summarizes the findings of the Accelerator Working Group (AWG) of the International Scoping Study (ISS) of a Future Neutrino Factory and Superbeam Facility. The work of the group took place at three plenary meetings along with three workshops, and an oral summary report was presented at the NuFact06 workshop held at UC-Irvine in August, 2006. The goal was to reach consensus on a baseline design for a Neutrino Factory complex. One aspect of this endeavor was to examine critically the advantages and disadvantages of the various Neutrino Factory schemes that have been proposed in recent years.This document summarizes the findings of the Accelerator Working Group (AWG) of the International Scoping Study (ISS) of a Future Neutrino Factory and super-beam Facility. The work of the group took place at three plenary meetings along with three workshops, and an oral summary report was presented at the NuFact06 workshop held at UC-Irvine in August, 2006. The goal was to reach consensus on a baseline design for a Neutrino Factory complex. One aspect of this endeavor was to examine critically the advantages and disadvantages of the various Neutrino Factory schemes that have been proposed in recent years.

The Antiproton Decelerator: AD

Abstract In view of a possible future programme of physics with low-energy antiprotons, a simplified scheme for the provision of antiprotons at 100 MeV/ c has been studied. It uses the present target area and the modified Antiproton Collector (AC) in its present location. In this report the modifications and the operation are discussed.

Proton drivers for neutrino beams and other high intensity applications

CERN, Fermilab, J-PARC and RAL tentatively plan to have proton accelerators delivering multi-MW of beam power in view of enhancing their physics reach especially in the domain of neutrinos. These plans are described, together with their benefits for other applications.

RF GYMNASTICS IN SYNCHROTRONS

The RF systems installed in synchrotrons can be used to change the longitudinal beam characteristics. RF gymnastics designates manipulations of the RF parameters aimed at providing such non-trivial changes. Some keep the number of bunches constant while changing bunch length, energy spread, emittance, or distance between bunches. Others are used to change the number of bunches. After recalling the basics of longitudinal beam dynamics in a hadron synchrotron, this paper deals with the most commonly used gymnastics. Their principle is described as well as their performance and limitations.

Superconducting linac for a proton driver

Abstract A proton driver using a superconducting linac has the potential to provide beam with flexible characteristics at powers exceeding 4 MW. Efficient use of the input mains power is also an expected feature of such a system. The requirements specific to a neutrino factory which were listed at “NuFact’99” are summarized, and the basic design of such a linac-based proton driver is given. Subjects of further studies are outlined.

Linac-based Proton Driver for a Neutrino Factory

A Neutrino Factory Proton Driver based on a superconducting proton linac has been designed in the CERN context. The 5 GeV/4 MW H - beam from the linac is accumulated using charge exchange injection in a fixed-energy synchrotron and afterwards transferred to a compressor ring, where bunch rotation takes place. The lattices of the accumulator and compressor are described, as well as magnet technology and RF manipulations. Critical issues related to charge-exchange injection, space-charge effects in the compressor and beam stability in the accumulator, are addressed. The analysis is focused on the baseline scenario, which provides 6 bunches on the target. Results of preliminary analysis of options with less bunches (three and one) are also presented.

PRELIMINARY CONSIDERATIONS ABOUT THE INJECTORS OF THE HE-LHC

A hadron collider operating at an energy much larger than the LHC (”HE-LHC”) would be a logical successor to the LHC itself, especially if its cost can be minimized by reusing a significant part of the CERN infrastructure like the existing tunnels and/or accelerators. The injector complex must however be extended to reach a beam energy of ~1.2 TeV and. in view of the time span of the HE-LHC project, the replacement of ageing accelerators can also be necessary. The main possible options are outlined together with their specificities.

Status of European studies for a neutrino factory at CERN

Studies for a Neutrino Factory at CERN (Prospective study of muon storage rings at CERN, CERN-1999-02; The CERN neutrino factory working group: status report and work plan, CERN-NuFact Note 28; CERN ideas and plans for a neutrino factory, CERN-NuFact Note 45) have made remarkable progress during the last year, supported by specialists from numerous laboratories in Europe and in close connection with teams looking at similar projects in the USA and in Japan. Although many options are still open, a reference scheme is pursued and work has advanced on many on its components. The status of these studies is described, as well as the future plans. Potential evolutions of the reference scheme and the possibility of a staged realisation are also commented upon.

Computer controls of the CERN PS radio-frequency system

Abstract The PS computer control project has recently been terminated with the integration of the radio-frequency system. While the general controls frame was used, special software and hardware solutions were also necessary to cope with the peculiarities of the rf system. After a brief description of both the rf process and the PS control system, this paper recalls the various operational requirements and real-time constraints and relates on the criteria and methods followed during the design phase. Some implementation is illustrated with emphasis on diagnostics and measurements.