Haut PDF A low energy facility at SPIRAL-GANIL

A low energy facility at SPIRAL-GANIL

A low energy facility at SPIRAL-GANIL

L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r]

23 En savoir plus

The radiation safety access control at GANIL and the RiB SPIRAL facility

The radiation safety access control at GANIL and the RiB SPIRAL facility

controlled rooms (e.g. Target_Ian_Source room, cyclotron ClME room,), two gating locks equipped with access badge readers for individual counting purpose and ten doors [r]

5 En savoir plus

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

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

We have checked that this choice allowed also to set the Belmont-Pabot inflector, an electrostatic quadrupole (vertical focusing) and the corresponding cavity noses [r]

5 En savoir plus

SPIRAL: The R.I.B. Facility under construction at GANIL

SPIRAL: The R.I.B. Facility under construction at GANIL

The facility consists of a production target associated to an ECR ion source specially designed for this purpose, a low energy beam line, a k=26S compact cyclotron postaccel[r]

4 En savoir plus

Ion sources at GANIL

Ion sources at GANIL

Radioactive ion sources for The SPIRAL2 project To explore the production of heavy neutron-rich nuclei with suitable intensities, the method of production has been reviewed and it appears that the fission of uranium induced by neutrons with an energy of around 40 MeV can lead to interesting production rates for heavy neutron rich elements like Xe or Sn (see reference 8). The SPIRAL 2 project consists in building a new accelerator for the primary beam coupled to a new radioactive ion production area. The rare isotope beams are produced via the fission process, with the aim of 10 13 fissions/s at least, induced either by fast neutrons from a C converter in a UCx target, or by direct bombardment of fissile material. The driver, with an acceleration potential of 40 MV, will
En savoir plus

6 En savoir plus

GANIL / SPIRAL - 2001-2007 - Achievements, Highlights and Perspectives

GANIL / SPIRAL - 2001-2007 - Achievements, Highlights and Perspectives

As can be seen, at low energy the cross-section reaches very high values, of the order of one barn. The origin of this very high cross-section is the good momentum matching at this low energy of the loosely bound neutron in the initial and final state. This is the first time that this strong increase of transfer reaction cross sections at very low energy predicted for loosely bound systems was observed. Spectroscopic factors are in agreement with a simple shell model configuration. Some of the results are published [6-9]. Due to the fact that the beam was stopped in the detector, an excitation function for the reactions with energies between the incident beam energy and essentially zero energy is obtained. The extraction of information on excited states in 7 He from experimental spectra must take into account the fact that the widths of the populated states are large, and that both width and population cross-sections are energy dependent. The energy dependence of the decay width was treated in two ways: as given by R-matrix formalism, and calculated as single particle resonance width by the code FRESCO. The experimental energy resolution being much better than the observed structure, it was not necessary to take it into account in the simulation. Figure 4 shows a fit of the experimental energy spectrum with three resonances at E R = 0.44, 1.0 and 3.3 MeV, with arbitrary
En savoir plus

241 En savoir plus

The Effects of thermostat setting on seasonal energy consumption at the CCHT Twin House Facility

The Effects of thermostat setting on seasonal energy consumption at the CCHT Twin House Facility

Two summer thermostat strategies were examined: a daytime temperature set-up and a higher temperature setting 24h per day. Air conditioner and furnace electrical savings from the set-up strategy were highly dependent on weather – days with low solar gains producing minimal savings. For the entire cooling season, savings of 11% could be expected. The set-up strategy also suffered from long recovery times, surpassing 7 hours on the hottest days. Proper implementation of a set-up strategy would require larger sizing of the air conditioning unit to reduce these recovery times. Even then, the set-up strategy would be adding to the peak electrical load experienced in the evening by utilities. Air conditioner and furnace electrical savings were more than twice as high for the higher temperature setting strategy, 23% for the entire cooling season. The downside to the higher temperature setting is occupancy comfort. Not only is the temperature higher, but indoor humidity increases due to less frequent air conditioner operation, decreasing comfort levels and increasing perceived heat. Thermostat strategies are likely not the best alternative when used on their own for reducing summer energy use.
En savoir plus

17 En savoir plus

SPIRAL2 at GANIL

SPIRAL2 at GANIL

The design of the low energy separator is in progress, and two solutions are studied simultaneously : one BRAMA (Broad Range Atomic Mass Analyser) type solution [7], with an Elbek magnet, and one "Wien filter" solution. In the BRAMA solution (fig. 4a), the magnet, leading selected masses to parallel ways at its exit, is followed by 2 electrostatic deflectors, that can slide along 2 different lines, each parallels to the focal plan, and deliver 2 different beams among the fission products in the 70-160 mass range. It performs completely the 2 selected beams independence specifications but is hardly relevant to a perfect optical management of beam characteristics at its object point, which is difficult in space charge regime. An initial space charge suppresser section is needed before the separator to perform good transmissions. In the second solution (fig. 4b), a Wien filter is installed just after a short electrostatic focalising section. An on-axis exit is managed for the main beam and an off-axis exit is dedicated for low energy beam line. The 2 selected beams are post-analysed by two magnetic dipoles. This system is particularly acceptant in terms of space charge (no focusing point is necessary before beams selection and thus higher intensities are transportable) but the two beam tuning is not independent.
En savoir plus

6 En savoir plus

RESEARCH AT GANIL A COMPILATION 1996-1997

RESEARCH AT GANIL A COMPILATION 1996-1997

to Sn from the medium energy line facility in order to study the effect of (dE/dx)e on the formation of the dangling bond have been performed. Analysis of the results is in progress. Tho[r]

190 En savoir plus

Charged particle activation facility in NPI CAS and in future GANIL/SPIRAL2-NFS

Charged particle activation facility in NPI CAS and in future GANIL/SPIRAL2-NFS

The degrader will allow for a fast change of beam energy (as the time needed for the energy change of the accelera- tor and subsequent magneto-optic tuning is yet unknown ) at the expense of the energy (and angular - see right panel of figure 1) straggling. The degrader is connected to the same cooling loop as the Faraday cup and the isolation better than 500 MΩ is maintained. The degrader has its own electrical readout electrode. The third element down- stream is an anti-scattering collimator-electrode, that has several functions: (a) to remove eventual particles scat- tered by collimator or degrader to large angles (angular straggling, see figure 1), (b) to pose as an electrode for the sample+Faraday cup block, to repel eventual kicked-out electrons in Faraday cup measurement, (c) keep the elec- trons coming from the degrader material on the degrader side or deflect them by a pair of magnets that are installed around the collimator hole.
En savoir plus

5 En savoir plus

First steps towards a target laboratory at GANIL

First steps towards a target laboratory at GANIL

1. Introduction GANIL is a national facility for nuclear physics research where beams from carbon to uranium can be accelerated up to 95 MeV/u using two cyclotrons. Some of the experiments require specific targets. For instance, since 1997, GANIL, LPC (Caen) and SPhN-DAPNIA (Saclay), supported by the CNRS and CEA, used the velocity filter LISE3 to investigate nuclei at the limits of stability, such as superheavy elements. In these measurements, the main difficulty comes from the very low counting rate of the sought-after events and it is necessary to optimize each aspect of the experimental setup: beam, targets, velocity filter performance and detection. As these experiments last several weeks and the thin targets must sustain intense beams, high quality targets should be available in quantity. For last year’s experiments (search for a new isotope of element Z=114 and spectroscopy of 251 Md via the reactions
En savoir plus

7 En savoir plus

Fusion reactions involving radioactive beams at GANIL

Fusion reactions involving radioactive beams at GANIL

Fusion reactions involving radioactive beams at GANIL. Gilles de France GANIL, BP55027 F-14076 CAEN cedex 5 The ISOL type SPIRAL facility at GANIL has been commissioned recently and delivers radioactive beams (RIBs) for physics since a couple of years. Despite many difficulties arising from both the complexity to produce good beam quality and intensity as well as to setup the appropriate detection system, the first experiments with SPIRAL have demonstrated that nuclear dynamics studies (nuclear structure and low energy reaction mechanism) at the Coulomb barrier are possible with that kind of beams. RIBs like 76 Kr and 6,8 He have been used to produce exotic nuclei via fusion evaporation or to study reaction mechanisms at low energy. These two examples will be detailed in this talk.
En savoir plus

10 En savoir plus

Study of $^{19} $Na at SPIRAL

Study of $^{19} $Na at SPIRAL

Anarki [17]. Figure 2 shows the result of this calcula- tion as a continuous curve, performed at the angle of Θ CM = 180 ◦ and using the same energy resolution as the experimental one. Again we can observe an overall excellent agreement, in normalization and in energy. Moreover, no extra peak is visible in the spectrum. However, the agreement between the calculation and our measurement is not perfect, we can observe differ- ences, mainly in normalization. We have observed neg- ligible differences in the calculations when angles are chosen within the angular acceptance of the detectors. In fact, the differences are mainly due to the uncer- tainties in the known properties of the excited states in 19 F. For example, we don’t know precisely the width for all excited states in that nucleus. The low energy part of the spectrum was calibrated in energy using the results of the R-matrix calculation. In figure 2, at E CM gap ≈ 1.1 MeV there is an energy-gap of ≈ 200 keV with no data. This gap results from dead layers between the first ∆E detector and the next one, and selection conditions. The protons with energies higher than this energy gap are identified and selected using a standard contour in a ∆E-E plot. The lower energy part of the spectrum is produced by a different technique. Firstly, we have applied a time of flight selection to identify the protons. Secondly, to select the particles stopped in the first detector we applied a low energy threshold on the second detector.
En savoir plus

13 En savoir plus

Dosimetry for radiobiology experiments at GANIL

Dosimetry for radiobiology experiments at GANIL

by beam degraders. In Part 2 we describe the beam line and instruments that have been developed for radiobiology experiments. This adaptation of a physics machine to biological context with its speci fic constraints is reinforced by the presence of LARIA since 2003. Part 3 is dedicated to the monitoring of low beam intensities and the description of dosi- metry carried out for each experiment. The proposed method aims to be not only compatible with the speci ficities of a large nuclear phy- sics facility, but also to guarantee a good repeatability which is of a great interest for experiments sometimes spaced by more than a year. An evaluation of standard uncertainties will be given.
En savoir plus

9 En savoir plus

Future opportunities with SPIRAL2 at GANIL

Future opportunities with SPIRAL2 at GANIL

heavy ions is a powerful method to produce deficient nuclei as extensively used at the ISOL-Unilac facility (Ref. 20). The very intense heavy ions delivered by the SPIRAL2 LINAC allows us to expect the prodction of exotic nuclei with high intensity. It opens the possibility to complete their spectroscopy study in the low energy facility DESIR (Ref. 21), but also for the less exotic ones the acceleration possibility with the cyclotron CIME of SPIRAL1. The beam power deposition in thin target due to the very short heavy ion range (about 10  m) constitutes, however, a difficult challenge. The aim is to gain a factor of 10-50 comparing to GSI-Unilac. Development in the continuation of the ISOL-UNILAC at SPIRAL2 is under the responsibility of the Centre d’Etudes Nucléaires de Bordeaux Gradignan (CENBG) of IN2P3. A first beam could be 94 Ag by the reaction
En savoir plus

7 En savoir plus

Summer and winter field monitoring of high and low solar heat gain glazing at a Canadian twin house facility

Summer and winter field monitoring of high and low solar heat gain glazing at a Canadian twin house facility

INTRODUCTION Windows and other types of fenestration systems are key components of all types of buildings. On the energy performance, windows play a dual role, allowing solar gains to offset the auxiliary heating loads during the heating season or add to building loads during the cooling season. Various research studies have shown that, in a typical Canadian house with the conventional windows, the window heat losses during the heating season account for more than 40% of total heat losses. The solar gains typically range from 10% to 27% of total energy requirements for the house. During the summer months, excessive solar gains through windows add to cooling loads. During the last two decades, significant research efforts have resulted in the development of high thermal performance, low emissivity coated glass in windows. The products available today have generally much better insulating values; however, many may have lower solar heat gains.
En savoir plus

19 En savoir plus

High efficiency ISOL system to produce neutron deficient short-lived alkali RIBs on GANIL/SPIRAL 1 facility

High efficiency ISOL system to produce neutron deficient short-lived alkali RIBs on GANIL/SPIRAL 1 facility

Figure 1: Principle of the TISS. Radioactive ion production follows steps 1 to 6. Description of the TISS design The TISS (see Figure 2) mainly consists of two radial foils of 50 mm in diameter intersected by a 12 mm graphite cylinder (0.8 mm thick, 12 mm height and 50 mm in outer diameter). The ring is made of TOYO TANSO graphite (IG-19 type) [x]. The first foil directly impinged by the primary ion beam acts as a target ( 58 Ni) and the second one acts as a catcher for the recoil products and low energy primary beam. The first foil is the production target and is 3 µm or 6.5 µm thick for the production of 74 Rb or 114 Cs respectively. The second foil is made of a flexible graphite “paper”, commercially called Papyex®, its microstructure is strongly anisotropic, leading to anisotropic properties between parallel planes and perpendicularly to the plane of the foil. Ni and Papyex® foils are pressed on the cylinder edges with two flanges assembled by screws. This system is the cavity. A current is injected in the walls of the cavity, i.e. walls of the ring and of the foils, through a flexible tantalum band situated at the opposite side from the exit aperture of the TISS. The current leaves the cavity through a graphite wheel connected to the cavity at the exit aperture. Both extremities of tantalum band and graphite wheel are fastened to cooled parts, on the current feedthrough and vacuum chamber respectively. Owing to the current flowing through the resistive materials of the graphite ring, graphite foil and Ni foil, the cavity is heated (nominally at 1600 K) and an electric field oriented towards the exit aperture is created within the cavity. According to the supplies in the production cave of SPIRAL 1, where this TISS will be installed in fine, 300 A of current is potentially available to heat the cavity walls.
En savoir plus

12 En savoir plus

The neutrons for science facility at SPIRAL-2

The neutrons for science facility at SPIRAL-2

a e-mail: xavier.ledoux@ganil.fr NFS will deliver continuous and quasi-mono-energetic neutron beams up to 40 MeV. The proton and deuteron beams accelerated by the linear accelerator are particularly well suited for production of high neutron flux. NFS is equipped with a long time-of-flight area designed for the study of (n,fission), (n,xn) or (n,lcp) reactions in the fast energy range. An irradiation station will also be available for measurements by activation method of neutron and ion induced reactions. Some applications like the production of radio-isotopes for medical applications or electronic chip irradiations will also be investigated. NFS will open GANIL/SPIRAL-2 to a new community of physicists in academic research as well as in several fields of applications.
En savoir plus

7 En savoir plus

The Effects of Thermostat Setting on Seasonal Energy Consumption at the CCHT Research Facility

The Effects of Thermostat Setting on Seasonal Energy Consumption at the CCHT Research Facility

2 Methodology 2.1 Experimental Conditions A unique feature of the CCHT test facility is the ability to make a side-by-side comparison of the energy and thermal performance of the two houses. However, the houses cannot be perfectly identical. For this reason, it is important to establish a benchmark during which the houses operate under identical conditions. In both the winter and summer benchmarking condition, thermostats were set to 22°C for 24 hours/day. Results from the benchmarking set performance lines of comparison in winter and summer operation against which the thermostat control experiments can be compared. Setback periods were chosen based on the pre-programmed options of the thermostat. Three separate setback trials were conducted during the winter heating season. These are outlined in the following table.
En savoir plus

72 En savoir plus

A Multipurpose Fast Neutron Beam Capability at the MASURCA Facility

A Multipurpose Fast Neutron Beam Capability at the MASURCA Facility

On the basis of these preliminary findings, we conclude that MASURCA definitely has the potential for delivering a continuous fast neutron beam of some ~10 7 neutrons cm -2 s -1 in the accelerator room, 70% of those neutrons having energies in the 10 keV to 5 MeV range. Such a fairly high intensity neutron beam could have several applications. Further studies are needed to determine geometrical setups (off-centred core position, filters, …), in which the relative contribution of uncollided neutrons would be significantly increased, and thereby the sensitivity to the core fissile constituents improved. As part of these studies, fast neutron spectrometric techniques will be investigated, capable of providing a high energy resolution characterization of the beam.
En savoir plus

7 En savoir plus

Show all 10000 documents...