Superconducting magnets are available all year round, after online contact and agreement with the research group in charge of the desired equipment. These projects can be submitted at any time. They will be evaluated by the LNCMI. Selection criteria are scientific quality and feasibility of the experiment.
Before making any request, please check with your local contact that the desired experimental conditions are available.

Submit a project:
Complete the proposal_form_supra_2020 form and send it to lncmi.supra at lncmi.cnrs.fr.

Further information:
Scientific fields and contacts (EMFL website): https://emfl.eu/find-experiment-old/dc-magnets/#supraG

Pulsed fields and neutrons : LNCMI & ILL

Single crystal neutron diffraction in pulsed magnetic field

High field single crystal neutron diffraction experiments are carried out on the triple-axis spectrometer IN22 (Collaborative Research Group-CEA at the ILL, Grenoble) operated in a double or triple-axis mode with an incident neutron wavelength going from 1 Å to 1.5 Å. Magnetic fields are provided by a conical magnet, offering angular access of ±15° and ±30° in the scattering horizontal plane, developed by the LNCMI-Toulouse, with a cryostat specially designed by the ILL-Grenoble. This magnet produces a horizontal pulsed-field of long-duration (total duration of 100 ms, with a rise time of 23 ms) and high duty cycle (40-T shots can be repeated every 10 min). The sample temperature is regulated between 2 and 300 K independently from the pulsed field generation. The sample, aligned with respect to the field direction and area of interest in the reciprocal space, is glued on a sample-holder made from single crystalline sapphire. The maximum available volume for the sample is 7 x 6 x 6 mm³.

At each probed scattering position, the field dependence of the neutron intensities is extracted by summing the data accumulated over a few pulsed-field shots, with either constant time- or constant field-integration windows (the rise and fall of the pulsed field are analyzed separately).

Proposal evaluation : In order to use the mobile pulsed-field installation at the ILL neutron source, users will go through the appropriate selection committee at ILL. When submitting their proposal, users will choose the IN22 spectrometer on the proposal form. The equipment can only be used with support from LNCMI who provides and operates the magnet and power supply, therefore a LNCMI scientist will be included in the proposal and experimental team. Users who wish to submit a proposal and use this equipment are strongly advised to contact the LNCMI and CEA scientists (contacts below) before the final submission in order to investigate the feasibility of the work.

Contacts:

Fabienne Duc (Toulouse): fabienne.duc@lncmi.cnrs.fr

Frédéric Bourdarot (CRG-CEA IN22@ILL): bourdaro@ill.fr

Link to ILL : https://www.ill.eu/for-all-users/applying-for-beamtime/important-dates

Pulsed fields and laser : LNCMI & LULI 2000 or Apollon

Projects are evaluated using the LULI evaluation procedure. The feasibility of a project is determined by local LULI scientists and an LNCMI research engineer prior to submission.

Link to LULI 2000: https: //luli.ip-paris.fr/installations/luli2000

Pulsed fields and synchrotron: LNCMI AND ESRF

Energy-dispersive XAS and XMCD in pulsed magnetic field

X-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) measurements allow to investigate the microscopic nature of magnetic phase transitions by element-selective magnetometry.

Pulsed magnetic field XAS and XMCD measurements are carried out on the ID24-ED energy-dispersive absorption spectroscopy line at ESRF, Grenoble. Magnetic fields of up to 30 T parallel to the X-ray beam are produced by a pulsed magnet at high duty cycle, with a rise time of ~10 ms and a pulse duration of ~23 ms. XMCD spectra are obtained by differencing absorption spectra measured by varying either the polarity of the field (opposite +H and -H direction), or the polarization of the X-ray beam (right or left circular polarization). The field dependence of the absorption spectrum is recorded using a multi-image detection system. The polished sample (single crystals thinned to around 10-15 μm depending on the threshold of the element probed) is sandwiched between two diamond windows and mounted in a dynamic helium flow cryostat in which the sample is cooled by forced convection.

Proposal evaluation: In order to use the mobile pulsed-field installation at the ESRF, users will submit their project to the ESRF selection committee. When submitting their proposal, users will choose the ID24-ED beamline. The equipment can only be used with support from LNCMI who provides and operates the magnet and power supply, therefore a LNCMI scientist will be included in the proposal and experimental team. Users who wish to submit a proposal and use this equipment are strongly advised to contact the LNCMI and ESRF scientists (contacts below) before the final submission in order to investigate the feasibility of the work.

Contacts :

Fabienne Duc (LNCMI-Toulouse): fabienne.duc@lncmi.cnrs.fr

Raffaella Torchio (ID24@ESRF): torchio@esrf.fr

Link to ESRF : https://www.esrf.fr/home/UsersAndScience/Applying.html

Experience report
After your magnetic field experiment at the LNCMI, you must complete the Progress Report form (one page), online from the EMFL User Portal.
This report is needed to justify the use of the LNCMI’s intense magnetic fields to our funders and partners. It is also required by the EMFL Selection Committee.

Publications
All publications directly related to your proposal must explicitly mention
– the LNCMI and the EMFL for an experiment carried out on a resistive magnet: “We would like to thank the LNCMI-CNRS, a member of the European Magnetic Field Laboratory (EMFL), for its support”.
– LNCMI for an experiment using a superconducting magnet: “We would like to thank LNCMI-CNRS for their support”.