The TULIP project: First on-line result and near future Bosquet, V.; Jardin, P.; MacCormick, M. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
08/2023, Letnik:
541
Journal Article
Recenzirano
Odprti dostop
The TULIP project aims to produce radioactive ion beams of short-lived neutron-deficient isotopes by using fusion-evaporation reactions in an optimized Target Ion Source System (TISS). The first step ...consisted of the design of a TISS to produce rubidium isotopes. It was tested with a primary beam of 22Ne@4.5 MeV/A irradiating a natural Ni target at the SPIRAL1/GANIL facility in March 2022. Rates of 76,78Rb were measured as well as an exceptionally short atom-to-ion transformation time for an ISOL system, of the order of 200 μs. The second step of the project aims at producing neutron-deficient short-lived metallic isotopes in the region of 100Sn. A “cold” prototype has been realized to study the electron impact ionization in the TISS cavity and a “hot” version is under construction to prepare an on-line experiment expected in the near future.
This paper presents a critical review of research progress in modelling the structural response of polymer matrix composites exposed to fire. Models for analysing the thermal, chemical, physical, and ...failure processes that control the structural responses of laminates and sandwich composite materials in fire are reviewed. Models for calculating the residual structural properties of composites following fire are also described. Progress towards validation of the models by experimental characterisation of the structural properties of composites during and following fire is assessed. Deficiencies in the fire structural models are identified in the paper, which provide the focus for future research in the field.
Latest improvements of the SPIRAL1 facility at GANIL Chauveau, P.; Bosquet, V.; Damoy, S. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
08/2023, Letnik:
541
Journal Article
Recenzirano
Odprti dostop
Since 2001, the SPIRAL1 facility has been providing post-accelerated radioactive beams by the ISOL method. Over the last decade, SPIRAL1 has been improved to provide beams of condensable elements, by ...using a combination of a FEBIAD-type ion source (to produce 1+ ions) and a PHOENIX ECR charge breeder (to transform 1+ ions into N+ ions for post-acceleration). Both these elements have been improved in recent years: the FEBIAD source has been upgraded to improve its efficiency and reliability over time and the charge breeder was modified to extend the range of available charge states. In addition, a krypton beam was recently sent in a FEBIAD target ion-source system (TISS), allowing to produce medium mass radioactive 1+ ions that had not been previously produced in SPIRAL1. This papers compiles recent results illustrating the gain in performances and beam offer at SPIRAL1.
Sub-millisecond atom-to-ion transformation in the TULIP ISOL system Jardin, P.; MacCormick, M.; Bosquet, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2023, Letnik:
1055
Journal Article
Recenzirano
Odprti dostop
TULIP (Target Ion Source for Short-Lived Isotope Production) is an original Isotope Separator On Line project dedicated to the production of short-lived neutron-deficient ions. It was tested for the ...first time in March 2022 at GANIL (Grand Accélérateur National d’Ions Lourds )/ SPIRAL1 (Système de Production d’Ions Radioactifs Accélérés en Ligne, phase 1) with the production of Rb isotopes using a primary beam of 22Ne at an energy of 4.5 MeV/A. 76Rb and 78Rb isotope rates of ∼4 ×103 and ∼6 × 104 pps were measured for a primary beam intensity of 6 × 1012 pps and may be improved by a factor between 5 and 10.
A remarkably short atom-to-ion transformation (AIT) time close to 200 μs was achieved. This result demonstrates how beneficial the design of the TULIP target ion source system is in terms of response time and allows us to confidently look forward to 74Rb+ production, which is one of the goals of the TULIP project.
The results obtained on Rb production suggest testing the principle for the production of more sticky elements. Ions from metallic isotopes around 100Sn will be the next objective.
•Response time breakthrough in an innovative fast ISOL system.•Improved ISOL efficiency limits with respect to radioactive decay.•A new ISOL method for the production of neutron-deficient short-lived isotopes.
This paper presents a new method of digital adaptive predistortion for linearization of power amplifiers (PAs) exhibiting memory effects. The predistorter (PD) device consists of a lookup table (LUT) ...gain followed by a codebook of filters addressed by the index of the LUT. The adaptation is derived from direct learning for the LUT gains and indirect learning for the filter coefficients. We compared our results with those of two reference methods: a simple LUT system (with direct learning) and a memory polynomial system (with indirect learning). The performances of the new approach lie between those of the two reference methods in terms of adjacent channel power regrowth and error vector magnitude. The LUT is the less complex of the three methods, but it is a memoryless system, and it cannot correct the memory effects in the PA. The memory polynomial PD is more powerful, but its complexity is very high. The new technique, due to the addition of filters to the LUT, has possibilities to compensate not only for the nonlinearity but also for the memory effects in the PA, and it is one order of magnitude less complex than the memory polynomial system
Radioactive ion-beam development at SPIRAL1 Chauveau, P.; Angot, J.; Bosquet, V. ...
Journal of physics. Conference series,
05/2024, Letnik:
2743, Številka:
1
Journal Article
Recenzirano
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Abstract SPIRAL1 at GANIL is a facility dedicated to the production of radioactive ion beams (RIBs) and their post-acceleration. A major upgrade allowed this facility to produce RIBs of condensable ...elements. It does so by using both a hot 1+ ion source and an ECR Charge Breeder where the latter is used to increase the ion charge state for post-acceleration. The SPIRAL1 team is pursuing R&D on both fronts in order to expand the offer of RIBs. Several 1+ sources have been or will be tested in 2023: (1) MonoNaKe, a surface ion source, is being modified to ionize short-lived lithium isotopes (2) TULIP, dedicated to ionize short lived fusion-evaporation residues has been tested online for the second time (3) the FEBIAD source has produced radioactive Cr ions for the first time. The SPIRAL1 Charge Breeder (SP1CB) is now fitted with a fixed frequency amplifier (Klystron) and a variable frequency amplifier (travelling wave tube). Using one amplifier, the other, or both, enables several heating modes, giving better control on the charge state distribution at the output of SP1CB.
New exotic beams from the SPIRAL 1 upgrade Delahaye, P.; Dubois, M.; Maunoury, L. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
01/2020, Letnik:
463
Journal Article
Abstract
The charge breeder of the SPIRAL1 (SP1CB) facility provided this year to physicists new Radioactive Ion Beams (RIB) for experiments and machine development, showing significantly improved ...performances compared to those obtained during the initial on-line commissioning of the SPIRAL 1 upgraded facility 1. These improved performances were obtained thanks to thorough studies conducted off-line with 1+ ion beams produced by FEBIAD and ECR ion sources, successfully demonstrating the ability to couple SP1CB with them. In particular, the SP1CB established its capability to efficiently boost condensable elements such as
19
F
n+
,
32
S
n+
and
54
Fe
n+
, in addition to more standard alkali elements. The charge breeding efficiencies have been investigated varying several parameters: buffer gas, beam transverse emittances. The ΔV curves of stable elements as well as radioactive ones were recorded for high charge states. Their trends are discussed in more detail. Finally, as molecular beams provide some advantages compared to atomic ion beams for selecting isobaric species and optimizing transport of the radioactive elements from the hot production target to the SP1CB plasma, we discuss if the charge-breeding efficiencies could also take advantage of beams in the molecular form. The performances of the 1+/N+ charge-breeding process were investigated using SF
6
molecules broken into SF
x
1+
ions and compared to regular F
1+
and S
1+
ions. This contribution will deal with these topics and latest results will be showed.
Abstract
GANIL Facilities deliver ion beams from Proton to Uranium up to 95MeV/A. The Cyclotron facility combined with the SPIRAL1 facility provides Stable Ion Beams (SIB) since 1983 and Radioactive ...Ion Beams (RIB) since 2001 for Physics experiments. R&D of new stable and radioactive beams are continuously under progress matching physicist requirements. During the last ten years, the SPIRAL1 facility was upgraded to extend its capabilities to deliver RIBs of condensable elements. After a new one delivered in 2019, off-line R&D’s have been done on the Target Ions Source System and also on the Charge Breeder to improve efficiencies and achieve an operational and reliable facility.
In parallel, the commissioning of the LINAC-SPIRAL2 facility started in 2019 with a proton beam production. In 2020, a 16 kW proton beam was delivered for the first time on the Neutron For Science physics area, and a 4 mA beam of
4
He
2+
was produced with the PhoenixV3 ECR ion source to mimic a deuteron beam. In this article, an overview of GANIL ion sources, beam properties and future developments are described.
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