A. Dael

Budker Institute of Nuclear Physics, Novo-Nikolaevsk, Novosibirsk, Russia

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Publications (52)37.93 Total impact

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    ABSTRACT: The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO will look for axions or axion-like particles (ALPs) originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal-to-noise ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, currently the most powerful axion helioscope, reaching sensitivity to axion-photon couplings down to a few $\times 10^{-12}$ GeV$^{-1}$ and thus probing a large fraction of the currently unexplored axion and ALP parameter space. IAXO will also be sensitive to solar axions produced by mechanisms mediated by the axion-electron coupling $g_{ae}$ with sensitivity $-$for the first time$-$ to values of $g_{ae}$ not previously excluded by astrophysics. With several other possible physics cases, IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. In this paper we present the conceptual design of IAXO, which follows the layout of an enhanced axion helioscope, based on a purpose-built 20m-long 8-coils toroidal superconducting magnet. All the eight 60cm-diameter magnet bores are equipped with focusing x-ray optics, able to focus the signal photons into $\sim 0.2$ cm$^2$ spots that are imaged by ultra-low-background Micromegas x-ray detectors. The magnet is built into a structure with elevation and azimuth drives that will allow for solar tracking for $\sim$12 h each day.
    Journal of Instrumentation 01/2014; 9(05). · 1.66 Impact Factor
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    ABSTRACT: The International Axion Observatory (IAXO) is a next generation axion helioscope aiming at a sensitivity to the axion-photon coupling of a few 10^{-12} GeV^{-1}, i.e. 1-1.5 orders of magnitude beyond sensitivities achieved by the currently most sensitive axion helioscope, the CERN Axion Solar Telescope (CAST). Crucial factors in improving the sensitivity for IAXO are the increase of the magnetic field volume together with the extensive use of x-ray focusing optics and low background detectors, innovations already successfully tested at CAST. Electron-coupled axions invoked to explain the white dwarf cooling, relic axions, and a large variety of more generic axion-like particles (ALPs) along with other novel excitations at the low-energy frontier of elementary particle physics could provide additional physics motivation for IAXO.
    02/2013;
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    ABSTRACT: LUNEX5 is a new Free Electron Laser (FEL) source project aimed at delivering short and coherent X-ray pulses to probe ultrafast phenomena at the femto-second scale, to investigate extremely low density samples as well as to image individual nm scale objects. The proposed machine layout is based on a 400 MeV superconducting Conventional Linear Accelerator (CLA) mainly composed of 2 XFEL type cryomodules together with a normal- conducting high brightness photo RF gun. Such a mature and reliable technology is able to deliver high quality electron bunches up to few kHz suitable for user experiments. Furthermore, the last decade improvements in synchronization and stability offer a fertile land to explore the different and innovative seeded FEL operations aiming at producing higher coherence and energetic X-rays for the pilot user benefits. In parallel of the CLA branch, the very promising and highly innovative Laser Wake-Field Accelerator (LWFA) enables to produce very short electron bunches in the range of the femto- second and high peak current up to few GeV, as a FEL bench test using the same undulator lines.
    Proceedings of IPAC2012, New Orleans, Louisiana, USA. 01/2012;
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    ABSTRACT: In the framework of the Broader Approach Activities, the EU will deliver to Japan the 18 superconducting coils, which constitute the JT-60SA Toroidal field magnet. These 18 coils, manufactured by France and Italy, will be cold tested before shipping to Japan. For this purpose, the European Joint Undertaking for ITER, the Development of Fusion Energy (“Fusion for Energy”, F4E) and the European Voluntary Contributors are collaborating to design and set-up a coil test facility (CTF) and to perform the acceptance test of the 18 JT-60SA Toroidal Field (TF) coils. The test facility is designed to test one coil at a time at nominal current and cryogenic temperature. The test of the first coil of each manufacturer includes a quench triggered by increasing the temperature.The project is presently in the detailed design phase.
    Fusion Engineering and Design. 10/2011; 86(s 6–8):561–564.
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    ABSTRACT: A new superconducting coil outsert has been designed to be integrated within the existing infrastructure of the GHMFL hybrid project. Based on the novel development of a Nb-Ti Rutherford Cable On Conduit Conductor (RCOCC) cooled at 1.8 K by a bath of superfluid helium at atmospheric pressure, the superconducting coil aims to produce a continuous magnetic field of 8.5 T in a 1.1 m bore diameter. Combined with resistive insert coils, an overall continuous magnetic field of 42+ T will be produced in a 34 mm warm aperture. The main results of the conceptual study are reported including the conductor and coil specifications, the mechanical stress analysis, the coil protection scheme as well as the required cryogenics infrastructure. First developments and tests regarding the RCOCC are also presented.
    IEEE Transactions on Applied Superconductivity 07/2010; · 1.20 Impact Factor
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    ABSTRACT: The R3B-GLAD (GSI Large Acceptance superconducting Dipole) magnet provides the magnetic field needed for the R3B (Reaction studies with Radioactive Relativistic Beams) experiment which will be implemented on the future FAIR Facility (Facility for Antiproton and Ion Research). There are six trapezoidal racetrack coils for the R3B-GLAD magnet. Two main coils and four lateral coils are connected in series in a butterfly-like shape. The total weight of the six coils is 5.2 t. The cold mass assembly consists of coils, coil-casings, structural linking components and other non-structural components. The cold mass assembly weighs 22 t with envelope dimensions of 3.1 m (L) ?? 4.6 m (W) ?? 2.8 m (H). It is supported by the three cold to warm cryogenic supports. The magnet configuration was finalized in June 2008. The final cold mass design was accomplished end of July 2008. The manufacturing of the cold mass assembly has been launched since January 2009. The cold mass will be ready for test in the test station at CEA Saclay by the end of 2010. This paper gives an overview on the final design of the R3BGLAD cold mass assembly and manufacturing status.
    IEEE Transactions on Applied Superconductivity 07/2010; · 1.20 Impact Factor
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    ABSTRACT: Hybrid magnets, the combination of a resistive inner coil with a superconducting outer one, allow to generate the highest continuous magnetic fields for a given electrical power installation. A new superconducting coil outsert has been designed to be integrated in the existing infrastructure at LNCMI-Grenoble (GHMFL). Based on the specific development of a Nb–Ti Rutherford Cable On Conduit Conductor (RCOCC) cooled at 1.8K by a bath of superfluid helium at atmospheric pressure, the superconducting coil aims to produce a continuous magnetic field of 8.5T in a 1.1m bore diameter. Combined with resistive insert coils, an overall continuous magnetic field of 42+T will be produced in a 34mm warm aperture. The main results of the conceptual study will be presented together with first developments and tests of the RCOCC. Hybrid magnet-Superconducting magnet
    Journal of Low Temperature Physics 01/2010; 159(1):332-335. · 1.18 Impact Factor
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    ABSTRACT: The ATLAS detector as installed in its experimental cavern at point 1 at CERN is described in this paper. A brief overview of the expected performance of the detector when the Large Hadron Collider begins operation is also presented.
    Journal of Instrumentation 01/2008; 3:S08003. · 1.66 Impact Factor
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    ABSTRACT: Three elliptical undulators HU256 of electromagnetic type were produced, tested and magnetically measured by the Budker Institute of Nuclear Physics (Russia) for Synchrotron Soleil (France). The undulators have a new design of a Bx & Bz closed structure for insertion vacuum chamber. In the elliptical undulator HU256 with period of the magnetic fields of 256 mm, the vertical magnetic field (Bzmax=0.44 T) formed by 27 Bz laminated dipole magnets is symmetric, and the horizontal magnetic field (Bxmax=0.33 T) formed by 28 Bx laminated dipole magnets is asymmetric. The undulator can work in standard mode as well as in a quasi-periodical mode. The vertical magnetic field may be modulated by switching on the modulation coils placed on the Bz dipoles. Two power supply systems allow us to modulate the horizontal magnetic field, and change the radiation spectrum. The magnetic calculations of the individual dipoles and dipoles in ``undulator'' environment were executed by means of Mermaid 3D Code. The magnetic measurements of the individual dipoles had confirmed the magnetic calculations. On basis of semiempirical dependences from the mechanical characteristics the estimates of the magnetic parameters for all dipoles were calculated. Sorting of dipoles in the undulators have been done, and it has improved the magnetic parameters of the assembled undulators in comparison with the statistical estimations. The magnetic measurements of the undulators HU256 were carried out at Budker INP by Hall probes and at Soleil by Hall probes and Stretched Wire. Now the 1st undulator HU256 is installed at Soleil Storage Ring.
    01/2007;
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    ABSTRACT: The magnetic calculations of the individual dipoles and dipoles in ``undulator environment'' were executed by means of Mermaid 3D Code and these results were confirmed by magnetic measurements of the individual dipoles and the assembled undulators. The magnetic parameters of all dipoles were estimated on basis of the mechanical measurement of the dipole characteristics (pole gap, yoke width, coil position) and the main dependences obtained from magnetic calculations and measurements. These parameters were used for optimal placing of the dipoles in undulators (sorting). The special Hall probe system was designed and manufactured for magnetic measurements of the undulators. It allowed us to observe the inner structure of the magnetic fields. At a magnetic field measurement accuracy of +/- 15 muT the accuracy of the 1st integral calculated on the basis of the measured magnetic fields is ~ 50 muTm. All three undulators were magnetically measured at BINP and are being re-measured at Soleil after transportation.
    01/2007;
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    ABSTRACT: Three elliptical undulators HU256 (period 256 mm) of electromagnetic type were produced, tested and magnetically measured by the Budker Institute of Nuclear Physics (Russia) for Synchrotron SOLEIL (France). The undulators have a new design of a Bx and Bz closed structure for insertion vacuum chamber.The magnetic calculations of the individual dipoles and undulator structures were executed by means of Mermaid 3D Code. The expected magnetic parameters for all manufactured dipoles were fulfilled on basis of these model dependences from the mechanical characteristics (pole gap, yoke width, and coil position). The estimated 1st integral of all dipoles had been used in an optimal arrangement of the dipoles in undulators (sorting). Owing to the realized sorting, the 1st integral of the magnetic field and phase error of the assembled undulators had been decreased in comparison with the statistic estimations.The special Hall probes systems for the magnetic measurements of the undulators HU256 were designed and manufactured by the BINP. All three HU256 undulators were magnetically measured at the BINP and re-measured at the SOLEIL after transportation. The results of magnetic measurements and model estimates are compared and analyzed.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2007; 575:29-32. · 1.14 Impact Factor
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    ABSTRACT: SOLEIL is the French 2.75 GeV synchrotron radiation light source of low emittance under construction near Paris. It will provide high intensity photons covering a wide spectral range from the IR to the hard X-rays. The storage ring commissioning started in late May 2006, and the first photons on the first beamline were observed in September 2006. The first set of Insertion Devices (ID), either already installed before the ring commissioning or to be installed within the first year of operation of the machine, consists of one 640 mm period and three 256 mm period electromagnetic elliptical undulators, three 80 mm period APPLE-II type undulators, and three 20 mm period in-vacuum undulators. All these IDs make use of a wide panoply of technical solutions for generating various types of magnetic fields. Magnetic and conceptual designs were performed by SOLEIL, and the technical realization was carried out together with different manufacturers. The design specificities of the different types of IDs, as well as the results of the shimming and magnetic measurements performed at SOLEIL are reported.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2007; · 1.14 Impact Factor
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    ABSTRACT: The paper describes the design, magnetic computations and measurements of the elliptical undulator HU256 for Synchrotron Soleil (France): the new technology for insertion vacuum chamber has permitted the design of a Bx & Bz dipole closed structure for an electromagnetic undulator. This magnetic design has been realized on the basis of the 2-D, 3-D modeling (Mermaid and RADIA codes), and dependence's of the magnetic field integrals from the main macroscopic parameters have been obtained. The undulator can work in standard and quasi-periodical modes. The single dipoles and the undulator HU256 were magnetically measured by a Hall probes system. The results of magnetic measurements and computations are compared and analyzed
    IEEE Transactions on Applied Superconductivity 07/2006; · 1.20 Impact Factor
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    ABSTRACT: SOLEIL is a 2.75 GeV third generation synchrotron radiation facility under construction near Paris. The construction is going towards its completion. The commissionings of the LINAC and of the first transfer line are starting, the booster is already installed in the tunnel and the tests of the equipments are under way, the installation of the storage ring is just beginning. This paper presents the status of the main storage ring equipments: magnets, power supplies, vacuum system, diagnostics, RF system, front ends and insertion devices.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: Two variable polarization undulators have been designed and are under construction in the framework of a Collaboration agreement between Société Civile Synchrotron SOLEIL and Sincrotrone Trieste. In this paper the main aspects of the magnetic and mechanical design are summarized. Field optimization techniques are described, showing the achieved performance in terms of phase, trajectory and field integral errors.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: The ATLAS B0 model coil has been extensively tested, reproducing the operational conditions of the final ATLAS barrel toroid coils (ten Kate, 1999). Two test campaigns have taken place on B0, at the CERN facility where the individual BT coils are about to be tested. The first campaign aimed to test the cool-down, warm-up phases and to commission the coil up to its nominal current of 20.5 kA, reproducing Lorentz forces similar to the ones on the BT coil. The second campaign aimed to evaluate the margins above the nominal conditions. The B0 was tested up to 24 kA and specific tests were performed to assess: the coil temperature margin with respect to the design value, the performance of the double pancake internal joints, static and dynamic heat loads, behavior of the coil under quench conditions. The paper reviews the overall test program with emphasis on second campaign results not covered before.
    IEEE Transactions on Applied Superconductivity 07/2004; · 1.20 Impact Factor
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    ABSTRACT: The construction phase of SOLEIL, the French third generation synchrotron radiation source has begun in January 2002 with the aim of starting user operation in spring 2006. The energy of the machine is 2.75 GeV and it consists in a 354 m circumference electron storage ring, with 16 cells and 24 straight sections. The lattice is designed for a good dynamic acceptance even for large energy deviation (up to 6%) and requires very small multipolar components. All the magnets have been computed with 3D model on TOSCA code and the industrial production has started. The paper describes the 32 dipole, 160 quadrupole and 120 sextupole magnets including their interface with the vacuum chamber. Among the proposed ID beam lines, six ID's of four different types (APPLE 2, long and medium period electromagnetic undulator and in vacuum) have been identified to be ready for the commissioning of SOLEIL. The paper presents their principal characteristics and shows the expected brilliance performances. Two original designs are described to produce any kind of polarization with long period electromagnetic undulators.
    IEEE Transactions on Applied Superconductivity 07/2004; · 1.20 Impact Factor
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    ABSTRACT: Two electromagnetic undulators have been designed on the SOLEIL light source to produce variable polarizations in the range 5 eV - 200 eV. The first one (HU640) is a 10 m undulator composed of 16 periods of 640 mm. It will produce photons of 5 eV - 40 eV with all kinds of switchable (1 Hz) polarization states by varying the horizontal and vertical magnetic field components as well as the phase shift between them. This operation is achieved by means of three sets of coils mounted on non magnetic holders in a special arrangment. One set is dedicated to generate the horizontal component. Two other sets, shifted the one from the other by a quarter of period along the ID axis produce the vertical component with a possible continuous translation varying from +/- half a period without any carriage motion. The second undulator (HU256) operating between 10 eV and 200 eV is a 3.6 m undulator composed of two sequences of alternated dipoles. The two series of dipoles produce either the horizontal component of the magnetic field or the vertical one and are separated from each other by a quarter of period. Linear horizontal/vertical and elliptical polarized light is produced by varying independently the currents in the main coils. Quasi-periodic operation mode dedicated to harmonic rejection is achieved by the addition of ``backleg'' coils installed on the dipole legs. In this paper, we present the magnetic designs and the mechanical structures of the undulators as well as the expected optical performances.
    AIP Conference Proceedings. 05/2004; 705(1).
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    ABSTRACT: The construction phase of SOLEIL, the French third generation Synchrotron radiation Source has begun in January 2002 with the aim of starting Users operation in spring 2006. The machine now consists in a 354 m circumference ring, with 16 DB cells and 24 straight sections. The optics, with distributed dispersion, features a low 3.7 nmrad emittance at the 2.75 GeV operating energy, so as to provide high brilliance, from the VUV up to the hard X ray domain. In order to provide a long lifetime (18 hours), and beam position stabilities in the micron range, significant attention was paid at each design stage (optics, magnets, beam position monitors, vacuum and RF systems,..), including on the design of the building, the construction of which will start in summer 2003. All the magnets have been designed and are in the last stage to be ordered. The qualification of the 352 MHz super-conducting RF cavity prototype has been done on the ESRF ring. Insertion devices are being designed with the goal of serving a very large scientific community with high performances in an energy range as large as 5 eV to 18 keV with undulators. The contract was placed for the 100 MeV Linac for a delivery summer 2004.
    Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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    ABSTRACT: The ATLAS B0 model coil has been developed and constructed to verify the design parameters and the manufacture techniques of the Barrel Toroid coils (BT) that are under construction for the ATLAS Detector. Essential for successful operation is the mechanical behavior of the superconducting coil and its support structure. In the ATLAS magnet test facility, a magnetic mirror is used to reproduce in the model coil the electromagnetic forces of the BT coils when assembled in the final Barrel Toroid magnet system. The model coil is extensively equipped with mechanical instrumentation to monitor stresses and force levels as well as contraction during a cooling down and excitation up to nominal current. The installed set up of strain gauges, position sensors and capacitive force transducers is presented. Moreover the first mechanical results in terms of expected main stress, strain and deformation values are presented based on detailed mechanical analysis of the design.
    IEEE Transactions on Applied Superconductivity 04/2002; · 1.20 Impact Factor