Irradiation control of the "SPIRAL" target by measuring the ion beam intensity via a fast current transformer

International audienceIn order to obtain a more precise control on the irradiation of the targets of the "SPIRAL" installation, a new criterion of safety must be respected. To control this latter, an AQ system has been put in operation and more specifically a new device has been set up in order to measure the ion beam intensity and to calculate the number of particules per second. This value can then be integrated over time. This device consists of two Fast Current Transformers integrated in a mechanical unit placed in a vacuum chamber. These sensors reproduce the image of the pulsed beam at 10MHz and we take from the amplified signal of each sensor, the amplitude of the 2nd harmonic. Each one of these amplitudes is detected by a Lock-in Amplifier, which is acquired via a real time industrial controller. The intensity is calculated by the Fourier series relation between the amplitude of the 2nd harmonic and the average intensity. These equipments can be remotely tested by integrating a test turn on the sensors. They are redundant. The accuracy of measurement is estimated taking into account the variation of beam, of the environment and of the installatio

SPIRAL facility at GANIL : ion beam simulation and optimisation method for the CIME cyclotron injection system

International audienc

The SPIRAL radioactive ion beam facility

This document describes the scientific goals as well as the technical choices of the SPIRAL project (Système de Production d'Ions Radioactifs et d'Accélération en Ligne)

The high power target system for SISSI, an intense source of secondary ions

SISSIInternational audienceIn order to increase the collection efficiency of radioactive isotopes produced by the GANIL heavy ion beams impinging onto thick targets, a device named SISSi was designed to focus these beams on a 0.4 mm diameter spot. In view of the upcoming modification of the accelerator which will boost the beam intensities by a factor of 15, as well as for the present situation, a target had to be designed to reliably dissipate the high power deposited by the heavy ions on such a small area. The magnetic and cryogenic environment, along with the radiation and safety problems, were severe constraints in the design described below. Preliminary experimental results are given

Technical report on operating accelerators 2001-2002

This issue of the Technical Report about the Accelerators describes the operation for physics experiments and beam tests, various technical improvements and projects for the years 2001-2002 during which the most eventful result was the start of the SPIRAL facility operation

Status of the new high intensity injection system for GANIL

International audienceThe design and construction of a new high intensity injection system at GANIL is under way ; the goals are to accelerateseveral tens of electrical microamperes of Ar and Kr ions (mainly toproduce exotic nuclei) and to increase the heaviest ion beam intensities (Pb, U) . A factor of 2 to 3 will be obtained by raising the ECRIS frequency 10 to 14.5 GHz and another factor of 2 is expected from the new design of the axial injection line of one of the IWO compact cyclotrons (the capture of 40% of the beam in a +- 6” phase width is foreseen). A description is given of the source and its associated elements installed on a 100 kV insulated platform, along with the axia

Development and test of a cryogenic trap system dedicated to confinement of radioactive volatile isotopes in SPIRAL2 post-accelerator

International audienc

A cryogenic target for direct reaction studies with exotic beams

International audienceA cryogenic system has been designed to make a thin target of solid hydrogen isotopes usable under vacuum, with a particle beam. In order to insure the homogeneity of the target, an equivalent pressure is maintained with helium on both sides of the target windows during the formation of the solid hydrogen. The system developed is described and the results obtained with 1 mm thick solid hydrogen and deuterium targets, in two different experiments using the radioactive beams from the SPIRAL facility, are presented. The flatness achieved was better than a few percent in both experiments

Irradiation control of the “SPIRAL1” target by measuring the ion beam intensity: “CICS” Project

International audienceIn order to obtain a more precise control on the irradiation of the targets of the “SPIRAL1” installation and to optimize the experiments schedule as well as the exploitation costs, a new criterion of safety is respected. This new safety criterion is the maximum dose (maximum number of ions stopped in the Spiral1 Target). To control this, an AQ system has been put in operation and more specifically a new device has been set up in order to measure the ion beam intensity and to calculate the number of particules per second. This value can then be integrated over time. This device mainly consists of two redundant instrumentations, which are acquired via a real time industrial controller. The accuracy of measurement is estimated taking into account the variation of beam, of the environment and of the installation. This system obtained the agreement of the French nuclear safety authorities and is operational since September 2007