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12 results on '"Dilasser, G."'

2. Study of a CICC copper jacket junction for MADMAX

Author

Berriaud, C., primary, Werle, V., additional, Stacchi, F., additional, Maksoud, W. Abdel, additional, Calvelli, V., additional, Dilasser, G., additional, Juster, F.-P., additional, Lorin, C., additional, Lottin, J.-P., additional, Nunio, F., additional, and Pontarollo, T., additional

Published
2024
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3. Thermohydraulic Quench Back in a Copper CICC Coil Cooled by He II

Author

Abdel Maksoud, W., primary, Durañona, U., additional, Allard, J., additional, Baudouy, B., additional, Berriaud, C., additional, Calvelli, V., additional, Denarie, L., additional, Dilasser, G., additional, Donga, T., additional, Drouen, Y., additional, Godon, P., additional, Godon, R., additional, Guihard, Q., additional, Jurie, S., additional, Juster, F.-P., additional, Lorin, C., additional, Lottin, J.-P., additional, Millot, J.-F., additional, Molinié, F., additional, Nunio, F., additional, Pontarollo, T., additional, Correia-Machado, R., additional, Scola, L., additional, Segrestan, L., additional, Solenne, N., additional, and Stacchi, F., additional

Published
2023
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4. MADMAX Cryogenic Stability: Preliminary Design of the Macumba Demo-Coil for Physics

Author

Lorin, C., Abdel Maksoud, W., Berriaud, C., Calvelli, V., Dilasser, G., Lottin, J.-P., Nunio, F., Pontarollo, T., and Stacchi, F.

Abstract

The objective of the MADMAX project, led by the Max Planck Institute, is to detect axion dark matter with a mass of ∼100 µeV. To amplify the detection signal of the photons, induced by the axion conversion, the MADMAX dipole must produce ∼9 T within a 1.35 m aperture where a booster, the signal amplifier, is located. At the current stage of the project a demonstrator, Macumba, is needed for various reasons, i) to show that nominal current operation can be reached with MADMAX, ii) to practice coil fabrication, iii) to train the team that will be in charge of the MADMAX operation at DESY and iv) to start learning about the axion physics. Here is presented the design of the Macumba demonstrator magnet that targets operating conditions close to the final magnet in terms of loadline, mechanical constraints and heat generation. The structure and conductor of the demonstrator must be similar to a MADMAX coil to face the same fabrication issue as for MADMAX coils. This would allow improving the manufacturing procedures and tooling. In addition, Macumba magnet produces a physic-compatible magnetic field in an aperture able to host an R&D booster in preparation for the operation at DESY.

Published
2024
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5. Commissioning of the Iseult CEA 11.7 T whole-body MRI: current status, gradient–magnet interaction tests and first imaging experience

Author

Boulant, Nicolas, Quettier, Lionel, Aubert, G., Amadon, A., Belorgey, J., Berriaud, C., Bonnelye, C., Bredy, Ph., Chazel, E., Dilasser, G., Dubois, O., Giacomini, E., Gilgrass, G., Gras, V., Guihard, Q., Jannot, V., Juster, F. P., Lannou, H., Leprêtre, F., Lerman, C., Le Ster, C., Luong, M., Mauconduit, F., Molinié, F., Nunio, F., Scola, L., Sinanna, A., Touzery, R., Védrine, P., and Vignaud, A.

Subjects
Radiological and Ultrasound Technology, Biophysics, Radiology, Nuclear Medicine and imaging
Abstract

Objectives The Iseult MRI is an actively shielded whole-body magnet providing a homogeneous and stable magnetic field of 11.7 T. After nearly 20 years of research and development, the magnet successfully reached its target field strength for the first time in 2019. This article reviews its commissioning status, the gradient–magnet interaction test results and first imaging experience. Materials and methods Vibration, acoustics, power deposition in the He bath, and field monitoring measurements were carried out. Magnet safety system was tested against outer magnetic perturbations, and calibrated to define a safe operation of the gradient coil. First measurements using parallel transmission were also performed on an ex-vivo brain to mitigate the RF field inhomogeneity effect. Results Acoustics measurements show promising results with sound pressure levels slightly above the enforced limits only at certain frequency intervals. Vibrations of the gradient coil revealed a linear trend with the B0 field only in the worst case. Field monitoring revealed some resonances at some frequencies that are still under investigation. Discussion Gradient-magnet interaction tests at up to 11.7 T are concluded. The scanner is now kept permanently at field and the final calibrations are on-going to pave the road towards the first acquisitions on volunteers.

Published
2023
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6. Progress Toward Medical Use of the Iseult Whole Body 11.7 T MRI: First Images

Author

Quettier, L., primary, Aubert, G., additional, Amadon, A., additional, Belorgey, J., additional, Berriaud, C., additional, Bonnelye, C., additional, Boulant, N., additional, Bredy, Ph., additional, Dilasser, G., additional, Dubois, O., additional, Gilgrass, G., additional, Gras, V., additional, Guihard, Q., additional, Jannot, V., additional, Juster, F.P., additional, Lannou, H., additional, Lepretre, F., additional, Lerman, C., additional, Le Ster, C., additional, Mauconduit, F., additional, Molinie, F., additional, Nunio, F., additional, Scola, L., additional, Sinanna, A., additional, Touzery, R., additional, Vedrine, P., additional, and Vignaux, A., additional

Published
2023
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12. The possible influence of third-order shim coils on gradient-magnet interactions: an inter-field and inter-site study.

Author

Boulant N, Le Ster C, Amadon A, Aubert G, Beckett A, Belorgey J, Bonnelye C, Bosch D, Brunner DO, Dilasser G, Dubois O, Ehses P, Feinberg D, Feizollah S, Gras V, Gross S, Guihard Q, Lannou H, Le Bihan D, Mauconduit F, Molinié F, Nunio F, Pruessmann K, Quettier L, Scheffler K, Stöcker T, Tardif C, Ugurbil K, Vignaud A, Vu A, and Wu X

Subjects
Magnetic Resonance Imaging methods, Magnets
Abstract

Objective: To assess the possible influence of third-order shim coils on the behavior of the gradient field and in gradient-magnet interactions at 7 T and above., Materials and Methods: Gradient impulse response function measurements were performed at 5 sites spanning field strengths from 7 to 11.7 T, all of them sharing the same exact whole-body gradient coil design. Mechanical fixation and boundary conditions of the gradient coil were altered in several ways at one site to study the impact of mechanical coupling with the magnet on the field perturbations. Vibrations, power deposition in the He bath, and field dynamics were characterized at 11.7 T with the third-order shim coils connected and disconnected inside the Faraday cage., Results: For the same whole-body gradient coil design, all measurements differed greatly based on the third-order shim coil configuration (connected or not). Vibrations and gradient transfer function peaks could be affected by a factor of 2 or more, depending on the resonances. Disconnecting the third-order shim coils at 11.7 T also suppressed almost completely power deposition peaks at some frequencies., Discussion: Third-order shim coil configurations can have major impact in gradient-magnet interactions with consequences on potential hardware damage, magnet heating, and image quality going beyond EPI acquisitions., (© 2024. The Author(s).)

Published
2024
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