A5035003206- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Magnetic Properties and Applications
- Spacecraft and Cryogenic Technologies
- Cosmology and Gravitation Theories
- Advanced Condensed Matter Physics
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- Mechanical and Optical Resonators
- Neutrino Physics Research
- Advanced Thermoelectric Materials and Devices
- Magnetic Field Sensors Techniques
- Electronic Packaging and Soldering Technologies
Centre National de la Recherche Scientifique
2011-2024
Université Grenoble Alpes
2013-2024
Laboratoire National des Champs Magnétiques Intenses
2014-2024
Université Joseph Fourier
2011-2015
Université Toulouse III - Paul Sabatier
2013
European Organization for Nuclear Research
2001-2008
Université Savoie Mont Blanc
1996
Institut Néel
1994-1995
A new method to amplify the photon-axion conversions in a magnetic field is proposed using buffer gas at specific pressure photon-regeneration experiment. As first result, bounds for mass and coupling constant laboratory experiments aiming detect any hypothetical scalars pseudoscalars, which can couple photons were obtained, excluding with 95% confidence level, recently withdrawn PVLAS result.
Recent theoretical and experimental studies highlight the possibility of new fundamental particle physics beyond Standard Model that can be probed by sub-eV energy experiments. The OSQAR photon regeneration experiment looks for "Light Shining through a Wall" (LSW) from quantum oscillation optical photons into "Weakly Interacting Sub-eV Particles" (WISPs), like axion or axion-like particles (ALPs), in 9 T transverse magnetic field over unprecedented length $2 \times 14.3$ m. No excess events...
A collaboration between CNRS-Grenoble and IBS-CAPP Daejeon plans to build a Sikivie’s type haloscope for axion/ALPs dark matter search at the Dine-Fischler-Srednicki-Zhitnitskii sensitivity 300–600 MHz range. It will be based on large-bore superconducting “outsert” coil of Grenoble hybrid magnet, providing central magnetic field up 9 T in an 810-mm warm bore diameter. This magnet has recently been successfully powered 8.5 T, achieving first step electrical commissioning phase. The design...
In this note we report on the development plans and first results of Grenoble Axion Haloscope (GrAHal) project. It is aimed at developing a haloscope platform dedicated to search for axion dark matter particles. We discuss its general framework reach sensitivity required probe well known invisible models, over particularly relevant masses coupling regions. also present our prototype result test run liquid He temperature, setting new exclusion limit $g_{a \gamma \gamma} \leq 2.2 \times...
The Grenoble Hybrid magnet is a modular platform using resistive and superconducting technologies to produce various DC high magnetic field flux configurations for the scientific community. They range from 43 T in 34 mm diameter with 24 MW electrical power 9 800 when coil used alone. Thanks ongoing upgrade of installation at LNCMI-Grenoble 30 MW, possibly 36 opportunity increase total well above 45 near future anticipated studied detail. key design parameters will be recalled comprising...
To produce a continuous magnetic field of at least 8.5 T in 1.1 m cold bore diameter, the superconducting outsert Grenoble Hybrid magnet is based on novel development Nb-Ti/Cu Rutherford Cable On Conduit Conductor (RCOCC) cooled to 1.8 K by bath superfluid helium pressurized atmospheric pressure. The main results conductor studies and are presented after brief introduction specificity hybrid magnets, namely electromagnetic couplings between resistive coils. Results obtained with short...
The regular lattice of the large Hadron collider (LHC) will make use more than 1600 main magnets and about 7600 corrector magnets, all superconducting working in pressurized superfluid helium bath. This complex magnet system fill 20 km LHC underground tunnel. In this paper an overview cold test program quality assurance plan to qualify be presented. quench training performance 1100 dipoles 300 quadrupoles, tested date, reviewed. From these results estimate number quenches that required start...
A CEA-CNRS French collaboration is currently developing a new hybrid magnet; this magnet combines resistive insert composed of Bitter and polyhelix coils large bore superconductor outsert to create an overall continuous magnetic field 42+ T in 34 mm warm aperture. The design the superconducting coil has been completed after thorough studies successful experimental validation phases. Based on novel development Nb-Ti/Cu Rutherford Cable On Conduit Conductor (RCOCC) cooled down 1.8 K by mean...
Since the pioneering work of Wood and Montgomery in 1965 at Francis Bitter Laboratory, hybrid magnets are still optimal approach producing highest continuous magnetic fields with limited electrical power consumption. They consist a large-bore superconducting magnet surrounding small-bore, high-power-density resistive magnet. Hybrid can generate well above those possible today purely allow substantial savings conductor volume and/or consumption compared to magnets. In this article, progress...
Hybrid magnets enable to achieve very high magnetic fields by combining resistive insert with a large bore superconducting outer coil. In order reduce the electromagnetic coupling between coils, we introduce an eddy-current shield and magnet. This additional is responsible for heat loads. To limit degradation of thermal behavior cold mass, innovative support ferrule has been designed. It allows rigid connection magnet structure. this paper, worst failure scenario identified modeled. results...
By combining resistive polyhelix and Bitter insert coils with a large bore superconducting outsert one, the new hybrid magnet in construction at LNCMI-Grenoble will produce an overall continuous magnetic field of 43 T 34-mm warm aperture. After brief reminder specificity magnets, namely strong electromagnetic mechanical coupling between coils, main specificities proposed design are presented. The coil 1.1-m cold diameter provide nominal least 8.5 T. It relies on specific development Nb–Ti/Cu...
A CEA-CNRS French collaboration is currently developing a new hybrid magnet to produce in first step continuous magnetic field of 43 T 34-mm warm bore aperture. This combines resistive insert, composed Bitter and polyhelix coils, large superconducting “outsert.” The coil based on the novel development Nb-Ti/Cu Rutherford Cable On Conduit Conductor (RCOCC) cooled down 1.8 K by bath superfluid helium at atmospheric pressure. It aims producing nominal 8.5 1.1-m cold diameter. specifications...
The association of two inner resistive coils (Polyhelix and Bitter) producing 34.5 T with an outer NbTi superconducting coil 8.5 to obtain a 43 hybrid magnet is technical challenge. Accidental failure modes leading complex electromagnetic behaviors large transient dynamical forces should be anticipated. These considerations lead reinforced design thermo-hydraulic strategy limit the overpressure. cryostat has been designed innovative thermo-mechanical supports sustaining at 1.8 K-1200 hPa...
In the new 43-T LNCMI hybrid magnet, a good conducting shield is inserted between resistive insert magnet and superconducting outsert magnet. Its goal to decrease ac losses induced in conductor during fault of insert, disruption coils (i.e., fast discharge) by smoothing flux variations, avoidance quench coil. The currents within are very large due presence copper material, which drawback screening effect. Such result Lorentz forces, particularly most severe scenario with burnout half Bitter...
The Grenoble Hybrid magnet is a modular user platform based on resistive and superconducting technologies. It will produce various high DC magnetic field flux configurations ranging from 43 T in 34 mm diameter with 24 MW of electrical power to 9 810 diameter, when the coil used alone. Thanks ongoing upgrade installation at LNCMI-Grenoble 30 MW, opportunity increase total significantly above 45 was anticipated for part require an optimization inserts. large-bore "outsert" hybrid specifically...
A new superconducting coil outsert has been designed to be integrated within the existing infrastructure of GHMFL hybrid project. Based on novel development a Nb-Ti Rutherford Cable On Conduit Conductor (RCOCC) cooled at 1.8 K by bath superfluid helium atmospheric pressure, aims produce continuous magnetic field 8.5 T in 1.1 m bore diameter. Combined with resistive insert coils, an overall 42+ will produced 34 mm warm aperture. The main results conceptual study are reported including...
The OSQAR photon regeneration experiment searches for pseudoscalar and scalar axion-like particles by the method of "Light Shining Through a Wall", based on assumption that these weakly interacting sub-eV couple to two photons give rise quantum oscillations with optical in strong magnetic field. No excess events has been observed, which constrains di-photon coupling strength both down $5.7 \cdot 10^{-8}$ GeV$^{-1}$ massless limit. This result is most stringent constraint ever achieved...
Within the LHC magnet program, a series of six, final design, full-scale superconducting dipole prototypes are presently being built in industry and tested at CERN. The main features these magnets are: two-in-one structure, 56 mm aperture, six-block two layer coils wound from 15.1 wide graded NbTi cables, all-polyimide insulation. This paper reviews test results 4.2 K 1.8 K. quench training, conductor performance, protection, sensitivity to ramp rate field quality presented discussed terms...
Premature training quenches are usually caused by the transient energy released within magnet coil as it is energised. Two distinct varieties of disturbances exist. They thought to be electrical and mechanical in origin. The first type disturbance comes from nonuniform current distribution superconducting cables whereas second one originates conductor motions or micro-fractures insulating materials under action Lorentz forces. All these events produce general a rapid variation voltages...
LNCMI is one of the unique worldwide laboratories offering scientific community access to various experimental conditions with continuous magnetic fields well above 20 T. currently developing a large field flexible platform. One configuration will produce 43 T in 34 mm warm bore aperture from combination homemade resistive electromagnet inserts and outer superconducting magnet (1.1 m internal cold dia.), latter being built close collaboration CEA-IRFU Saclay. The its mechanical structure...
We present results of calculations the ultimate forces for worst-case scenario, an important safety concern in hybrid magnets. They appear during a simultaneous and immediate burnout some or all upper lower resistive coil halves, shorts between coils mid-plain. Because their intensity, they have dramatic impact on mechanical layout magnet. An electromagnetic shield insert outsert, as it is case Grenoble magnet, takes up part these reduces them considerably. It makes calculation now time...