Test of a dispersion sweep correction system using a centroid in the DIRAC beam line

A new proton beam position detector named "centroid" is placed in the DIRAC target situation and is aligned with respect to the beam. Behind it there is a set of various targets used for the DIRAC experiment. The "centroid" itself collects the secondary electrons, which are emitted by the target when hit by the proton beam. This provides an on-line verification of the beam position without obstructing the beam path by a screen, and without perturbing the experiment. A computer application then calculates the corrections needed to centre the beam in both planes as a function of time. This report will explain how this is done

Automatic conditioning of the CTF3 RF system

The RF system of CTF3 (CLIC Test Facility 3) includes ten 35 MW to 40 MW 3 GHz klystrons and one 20 MW 1.5 GHz klystron. High power RF conditioning of the waveguide network and cavities connected to each klystron can be extremely time consuming. Because of this, a fully automatic conditioning system has been developed within a CERN JINR (Dubna) collaboration. It involves relatively minor hardware additions, most of the work being in application and front-end software. The system has already been used very successfully

Wavelet Shrinkage of LINAC III and Protons Synchrotron Booster Transformers by the Haar Transform

We have used wavelet shrinkage to reduce by 14% the noise level in the signal of the transformers used in some heavy ions accelerators. The loss of information is minimal compared to other techniques and our approach is non parametric. We provide some source code

Low Level RF Including a Sophisticated Phase Control System for CTF3

CTF3 (CLIC Test Facility 3), currently under construction at CERN, is a test facility designed to demonstrate the key feasibility issues of the CLIC (Compact LInear Collider) two-beam scheme. When completed, this facility will consist of a 150 MeV linac followed by two rings for bunch-interleaving, and a test stand where 30 GHz power will be generated. In this paper, the work that has been carried out on the linac's low power RF system is described. This includes, in particular, a sophisticated phase control system for the RF pulse compressor to produce a flat-top rectangular pulse over 1.4 µs

Synthèse d'un nouveau ligand hybride P,N

Communication par affiche (présentée par M. Petit) intitulée : Synthèse d'un nouveau ligand hybride P,

A VME-based measurement system for rf parameters in the CERN PS

The CERN Proton Synchrotron (PS) is a highly versatile particle accelerator[1]. It delivers beams of protons, antiprotons, leptons and lead ions on a cycle-to-cycle basis. The controls interface to the rf systems of the PS has recently been replaced by six VME crates [2]. As part of the upgrade, a digital system has been assembled which provides a measurement of the essential rf parameters of all cavities, including harmonic number and revolution frequency, every millisecond during the active part of each cycle of the machine. During the deadtime at the end of a cycle, these data are transferred from the VME modules to a VME crate-controller where processed machine-physics data are generated for every time sample. Information that would be very difficult to provide by ordinary analogue means is readily available for display or further treatment. This paper describes the hardware and software principles employed and the results achieved with the new measurement system