Precision Beam Position Monitor for EUROTeV

For future linear colliders (ILC, CLIC) a new Precision Beam Position Monitor (PBPM) has been designed within the framework of EUROTeV. The design goals are a resolution of 100nm and an overall precision of 10μm, in a circular vacuum chamber of 6mm in diameter. The required frequency bandwidth is 100kHz-30MHz. The PBPM is based on an inductive type BPM. Beam positions are derived from the difference between the image currents created by the electron beam into four strip electrodes surrounding the vacuum ceramics insert. In this paper, the design of the PBPM is presented together with first bench measurements, where two micro movers and a rotational stage, installed on a vibration damped table, have been used to characterize the PBPM

CTF3 BPM acquisition system

International audienc

LEIR closed orbit measurement system

In the Low Energy Ion Ring (LEIR) continuous (every 10 ms) tracking of the closed orbit is necessary during the acceleration and on request. To do so parts of the existing hardware, mainly the pick-ups (PUs) and cables, from LEAR have been re-used while other parts like the head amplifiers and the acquisition system has been re-designed. This note describes the hardware and software developed for the closed orbit measurement system as well as measurement results. The commissioning of LEIR started in September 2005 and is now close to nominal operation

A high resolution cavity BPM for the CLIC Test Facility

In frame of the development of a high resolution BPM system for the CLIC Main Linac we present the design of a cavity BPM prototype. It consists of a waveguide loaded dipole mode resonator and a monopole mode reference cavity, both operating at 15 GHz, to be compatible with the bunch frequencies at the CLIC Test Facility. Requirements, design concept, numerical analysis, and practical considerations are discussed.Comment: 5 pp. 14th Beam Instrumentation Workshop (BIW10) 2-6 May 2010. Santa Fe, New Mexic

Status of the design of a Wide Band beam Current Monitor (WBCM) for EUROTeV

In the framework of EUROTeV, the conceptual design of a new wide band wall current monitor is being carried out. The design is based on the wall current monitors presently installed in CTF3. The new design aims to increase the bandwidth up to 20 GHz. The present device has been tested in a dedicated test bench to understand its limitations in terms of bandwidth. The tests with the present device and the results of the conceptual design for the new one are summarized and discussed in this report

Design and Characterization of a Prototype Stripline Beam Position Monitor for the Clic Drive Beam*

The prototype of a stripline Beam Position Monitor (BPM) with its associated readout electronics is under development at CERN, in collaboration with SLAC, LAPP and IFIC. The anticipated position resolution and accuracy are expected to be below 2μm and 20μm respectively for operation of the BPM in the CLIC drive beam (DB) linac. This paper describes the particular CLIC DB conditions with respect to the beam position monitoring, presents the measurement concept, and summarizes electromagnetic simulations and RF measurements performed on the prototype

ELENA, a preliminary cost and feasibility study

To produce dense pbar beams at very low energies (100-200 keV), a small decelerator ring could be built and installed between the existing AD ring and the experimental area. Phase-space blowup during deceleration would be compensated by electron cooling in order to obtain final emittances comparable to the 5MeV beam presently delivered by the AD. This report describes preliminary machine parameters and layout of ELENA and also gives an approximate estimate of cost and manpower needs

Instrumentation for Longitudinal Beam Gymnastics in FEL's and at the CLIC Test Facility 3

Built at CERN by an international collaboration, the CLIC Test Facility 3 (CTF3) aims at demonstrating the feasibility of a high luminosity 3 TeV e+-e- collider by the year 2010. One of the main issues to be demonstrated is the generation of a high average current (30 A) high frequency (12 GHz) bunched beam by means of RF manipulation. At the same time, Free Electron Lasers (FEL) are developed in several places all over the world with the aim of providing high brilliance photon sources. These machines rely on the production of high peak current electron bunches. The required performances put high demands on the diagnostic equipment and innovative longitudinal monitors have been developed during the past years. This paper gives an overview of the longitudinal instrumentation developed at ELETTRA and CTF3, where a special effort was made in order to implement at the same time non-intercepting devices for online monitoring, and destructive diagnostics which have the advantage of providing more detailed information