{"id":15238,"date":"2025-02-06T16:05:30","date_gmt":"2025-02-06T14:05:30","guid":{"rendered":"https:\/\/lncmi.cnrs.fr\/?page_id=15238"},"modified":"2025-06-24T16:25:51","modified_gmt":"2025-06-24T14:25:51","slug":"static-fields","status":"publish","type":"page","link":"https:\/\/lncmi.cnrs.fr\/en\/static-fields\/","title":{"rendered":"Static fields"},"content":{"rendered":"

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Static Fields<\/h1>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ disabled_on=”on|on|off” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_button button_url=”#aimants” button_text=”High-field hybrid magnet” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_button button_url=”#resistif” button_text=”High-field Resistive Magnets” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row module_id=”aimants” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][dsm_text_divider header=”The hybrid electromagnet at LNCMI-Grenoble” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/dsm_text_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”0px||5px|||” module_alignment_tablet=”center” module_alignment_phone=”center” module_alignment_last_edited=”on|phone” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text content_tablet=”” content_phone=”” content_last_edited=”on|phone” _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”12px” hover_enabled=”0″ text_text_color_tablet=”” text_text_color_phone=”” text_text_color_last_edited=”on|phone” text_orientation_tablet=”” text_orientation_phone=”center” text_orientation_last_edited=”on|phone” global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n

<\/strong>Contact\u00a0: <\/strong>pierre.pugnat\u00a0[a]\u00a0<\/span>lncmi.cnrs.fr
Contact : <\/strong>luc.ronayette\u00a0[a]\u00a0<\/span>lncmi.cnrs.fr
Contact : <\/strong>rolf.pfister\u00a0[a]\u00a0<\/span>lncmi.cnrs.fr<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ disabled_on=”off|off|off” _builder_version=”4.27.4″ _module_preset=”default” min_height=”316.1px” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” width=”100%” min_height=”275.6px” custom_padding=”0px|||||” locked=”off” global_colors_info=”{}”]<\/p>\n

Hybrid electromagnets combining resistive and superconducting technologies are currently the only technology to deliver static magnetic fields in excess of 42 Teslas.<\/p>\n

This value is the maximum value achieved today by a purely resistive electromagnet at the High Magnetic Field Laboratory in Hefei, China (CHMFL). <\/strong>Its required 32.3 MW [1] to be provided at the magnet current leads.<\/p>\n

In the frame of a CNRS-CEA collaboration a modular hybrid electromagnet has been designed and built at LNCMI-Grenoble to produce intense magnetic fields and fluxes. The LNCMI-Grenoble hybrid magnet reached 42 Tesla in a diameter of 34 mm on November 8, 2024 [6] with a power about 24 MW. The Tallahassee (US) and the Hefei (China) facilities are today the two places\u00a0 worldwide where 45 T DC field is available by Hybrid electromagnets but using a much higher power (~ 32 to 35 MW).<\/p>\n

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[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/hybride04-1024×763.jpg” title_text=”hybride04″ url=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/hybride04.jpg” url_new_window=”on” align=”center” _builder_version=”4.27.4″ _dynamic_attributes=”url” _module_preset=”default” custom_padding=”|109px||||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”2_5,3_5″ disabled_on=”on|on|off” _builder_version=”4.27.4″ _module_preset=”default” min_height=”924.3px” custom_margin=”|auto|-88px|auto||” custom_padding=”3px||0px|||” global_colors_info=”{}”][et_pb_column type=”2_5″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/hybride01.jpg” title_text=”hybride01″ url=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/hybride01.jpg” url_new_window=”on” align=”center” _builder_version=”4.27.4″ _dynamic_attributes=”url” _module_preset=”default” custom_margin=”-90px||||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_orientation=”center” module_alignment=”center” custom_margin=”||1px|||” global_colors_info=”{}”]<\/p>\n

Fig. 2: a)<\/strong> Cross-section of the Grenoble hybrid magnet<\/p>\n

[\/et_pb_text][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/hybride02.jpg” title_text=”hybride02″ url=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/hybride02.jpg” url_new_window=”on” align=”center” _builder_version=”4.27.4″ _dynamic_attributes=”url” _module_preset=”default” height=”294px” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”11px” text_orientation=”center” global_colors_info=”{}”]<\/p>\n

Fig. 2: b)<\/strong> Photograph of the Grenoble Hybrid magnet.\u00a0<\/p>\n

Height is 5.4 m and mass around 54 tonnes.<\/p>\n

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One of the key feature of the LNCMI-Grenoble hybrid magnet (Fig. 2), is its modularity in terms of magnetic field and fluxes as summarized in Table 1. It then opens to a wide community of users and permit tp\u00a0 developp scientific themes at the LNCMI, such as the search for axionic dark matter [7] or high field Magnetohydrodynamics.<\/p>\n

The hybrid magnet\u00a0 aims to achieve 43 T with an electrical power of 24 MW in a 34 mm room temperature diameter bore.\u00a0 For this it combines a polyhelix insert (25.5 T) two Bitter coils (9 T) and a 1100 mm-diameter superconducting coil (8.5 T).<\/p>\n

The latter consists of a 9km Rutherford cable-on-conduit (RCOCC) conductor in Nb-Ti\/Cu (Fig. 1) , developed to control induced-current losses. This technology, an alternative to the Cable In Conduit Conductor (CICC), has been produced by soldering a Rutherford cable onto a hollow rectangular Cu-Ag stabilizer. During operation it is cooled at 1.8 K by a superfluid helium bath pressurized at 1200 hPa (Bain Claudet technology developed at CEA-Grenoble [2]). The coil is made up of 37 stacked double-plate pankakes connected in series and housed in a helium vessel connected by a cryogenic line to an external cryogenic satellite.<\/p>\n

A 35 K-eddy-current shield is inserted between the resistive and the superconducting coils to decrease the field variation with time seen by the RCOCC in case of a power cut of the resistive inner coils. A redundant superconducting coil protection system (MSS) has been developed for quench detection and energy extraction (80 MJ), together with a dedicated control and acquisition system. The hybrid magnet requires additional equipment (Fig. 2) such as a 5,000 m\u00b3\/h pumping unit, a dedicated 150 l\/h helium liquefaction unit, 7,500 A\/\u00b115 V power converters for the superconducting coil and the 12 + 18 MW power converters for the resistive coils,[3],[4],[5].<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _dynamic_attributes=”link_option_url” _module_preset=”default” animation_style=”slide” animation_duration=”1250ms” link_option_url=”@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjIxMTM0In19@” link_option_url_new_window=”on” global_colors_info=”{}” background__hover_enabled=”on|hover” background_color__hover=”rgba(247,238,185,0.43)” background_enable_color__hover=”on” content__hover_enabled=”off|hover” content__hover=”<\/p>\n

———- More Details click here <\/strong><\/span>———-<\/strong><\/span><\/h3>\n

“]<\/p>\n

———-\u00a0 More Details click here\u00a0 <\/strong><\/span>———-<\/strong><\/span><\/h4>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_id=”resistif” _builder_version=”4.27.4″ _module_preset=”default” min_height=”155.2px” custom_margin=”|auto|7px|auto||” custom_padding=”||44px|||” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][dsm_text_divider header=”RESISTIVE MAGNETS” module_id=”resistifs” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/dsm_text_divider][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” min_height=”30px” custom_padding=”0px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n

Contact\u00a0: <\/strong>francois.debray\u00a0[a]\u00a0<\/span>lncmi.cnrs.fr<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”0px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

Magnetic fields\u00a0 up to 38 T on\u00a0 resistive magnets and 42 T on the new Grenoble Hybrid magnet are\u00a0 produced\u00a0 in a 34 mm diameter bore at room temperature. In both cases the resistive coils are made from in house developped copper alloys.<\/p>\n

Dedicated rectifiers transform the high-voltage alternating current (AC) supplied to the laboratory in a two-stage process (225 KV to 15 KV, then 15 KV to 550 V) into a highly stable direct current (DC) that powers the high-field magnets. As understood two centuries ago by A.M. Amp\u00e8re, the magnetic field produced by a coil is proportional to the number of turns of the coil and the intensity of the electric current. The maximum current available is 2 times 33,000 amperes. The maximum magnetic field can be reached in less than two minutes (on resistive magnets). it is an essential feature for researchers who scan the magnetic field to characterize the properties of a given material over the full range of magnetic fields available.<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”2px|||||” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/Polyhelices-765×1024.jpg” title_text=”Polyhelices” align=”center” _builder_version=”4.27.4″ _module_preset=”default” max_height=”332px” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”12px” custom_padding=”||11px|||” global_colors_info=”{}”]<\/p>\n

The polyhelix is the central part of the high field magnets of LNCMI. There are used both for purely resistive magnets and for the hybrid magnet.<\/p>\n

[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/insert_vue_haut-1024×683.jpg” title_text=”insert_vue_haut” align=”center” _builder_version=”4.27.4″ _module_preset=”default” max_width=”73%” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_font_size=”12px” global_colors_info=”{}”]<\/p>\n

Top wiew\u00a0 of a 14 helix insert. Helices are electrically connected in series and hydraulically cooled in parallel.The rings pass the electrical current from an helix to another.
Slits are performed in the rings to optimize the flowrate between helices.<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/03\/Presqu_ile_2025.jpg” title_text=”Presqu_ile_2025″ align=”center” _builder_version=”4.27.4″ _module_preset=”default” width=”79%” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

For the High field magnet cooling , the High field facility is connected to the \u2018Isere\u2019 trough a dedicated pumping station shared with the nearby ILL Neutron facility and the ESRF Synchrotron facility. Magnetic field plateaus of several hours are then available for researchs which required to accumulate experimental data for obtaining high-quality scientific results.<\/p>\n

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Static Fields

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The hybrid electromagnet at LNCMI-Grenoble<\/span><\/h3>\n\t\t\t\t
<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>Contact\u00a0: pierre.pugnat\u00a0[a]\u00a0lncmi.cnrs.frContact : luc.ronayette\u00a0[a]\u00a0lncmi.cnrs.frContact : rolf.pfister\u00a0[a]\u00a0lncmi.cnrs.frHybrid electromagnets combining resistive and superconducting technologies are currently the only technology to deliver static magnetic […]<\/p>\n","protected":false},"author":12,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"folder":[184],"class_list":["post-15238","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/pages\/15238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/comments?post=15238"}],"version-history":[{"count":0,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/pages\/15238\/revisions"}],"wp:attachment":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media?parent=15238"}],"wp:term":[{"taxonomy":"folder","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/folder?post=15238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}