-
公开(公告)号：EP3726544A1
公开(公告)日：2020-10-21
申请号：EP19170280.2
申请日：2019-04-18
发明人： Borgnolutti, Franck , March, Stephen Alfred , Hinderer, Jörg , Pietig, Rainer , Schauwecker, Robert
摘要： A superconductor magnet apparatus (2), comprising
- a superconductor bulk magnet (9) with a superconductor bore (10), wherein the superconductor bulk magnet (9) has an axis (z) of rotational symmetry, and a maximum outer diameter OD bm in a plane perpendicular to the axis (z) of rotational symmetry, and the superconductor bore (10) has a minimum cross-sectional area S bo in a plane perpendicular to the axis (z) of rotational symmetry,
- a cryostat (7) with a room temperature bore (8), wherein the superconductor bulk magnet (9) is arranged within the cryostat (7), and the room temperature bore (8) is arranged within the superconductor bore (10),
- and a ferromagnetic shielding body (11) with a shielding bore (12), wherein the superconductor bulk magnet (9) is arranged within the shielding bore (12) of the ferromagnetic shielding body (11) and the ferromagnetic shielding body (11) extends beyond the superconductor bulk magnet (9) at each axial end with respect to the axis (z) of rotational symmetry by at least OD bm /3,
and further wherein for an average cross-sectional area S fb of the ferromagnetic shielding body (11), defined as the average of the cross-sectional areas of the ferromagnetic shielding body (11) in all the planes perpendicular to the axis (z) of rotational symmetry and intersecting the ferromagnetic shielding body (11), S fb ≥ 2.5*S bo applies, is characterized in that the ferromagnetic shielding body (11) is arranged within the cryostat (7). The invention provides a superconductor magnet apparatus, with which a magnetic field (or magnetic flux density) of a good homogeneity and temporal stability can be provided in a simple way.-
公开(公告)号：EP4177624A1
公开(公告)日：2023-05-10
申请号：EP21207337.3
申请日：2021-11-09
IPC分类号： G01R33/38 , G01R33/389 , G01R33/24 , H01F6/00 , G01R33/3815
摘要： A method for homogenizing a magnetic field profile of a superconductor magnet system (2), wherein the superconductor magnet system (2) comprises
- a cryostat (4) having a room temperature bore (7a),
- a superconductor bulk magnet (5), contained in the cryostat (4) and arranged coaxially with the room temperature bore (7a), and
- a cryogenic cooling system (13) adapted for cooling the superconductor bulk magnet (5),
wherein the superconductor bulk magnet (5) comprises at least N axially stacked bulk sub-magnets (6a-6c), with N≥3, wherein in an initial state, the bulk sub-magnets (6a-6c) carry respective initial currents with relative proportions according to an initial distribution scheme, and the method comprises a posterior correction step (50) which changes the initial currents into final currents with relative proportions according to a final distribution scheme which is different from the initial distribution scheme, wherein a magnetic field profile of the superconductor bulk magnet (5) based on the final currents is more homogenous than a magnetic field profile based on the initial currents, wherein the cryogenic cooling system (13) is adapted for independently controlling the temperature of each bulk sub-magnet (6a-6c), and wherein for changing the initial currents into the final currents, temperatures of at least a part of the bulk sub-magnets (6a-6c) are chosen at least temporarily different from each other, such that
- for a first part of the bulk sub-magnets (6a-6c), the bulk sub-magnets (6a-6c) of this first part are at least almost magnetically saturated, and
- for a second part of the bulk sub-magnets (6a-6c), the bulk sub-magnets (6a-6c) of this second part are significantly away from magnetic saturation,
is characterized in that for changing the initial currents into the final currents, the temperatures of the bulk sub-magnets (6a-6c) are chosen by controlling a heating power and/or a cooling power at the bulk sub-magnets without measuring the temperatures of the bulk sub-magnets, wherein for at least the part of the bulk sub-magnets (6a-6c), the heating powers are set at least temporarily different from each other and/or the cooling powers are set at least temporarily different from each other. The invention provides a method with which a magnetic field profile of a superconductor magnet system may be homogenized in a simple and inexpensive way.-
公开(公告)号：EP4053860A1
公开(公告)日：2022-09-07
申请号：EP21161113.2
申请日：2021-03-05
摘要： The invention relates to a method for charging a superconductor bulk magnet (90a) by field-cooling using a magnet charger system (10), wherein the magnet charger system (10) comprises a background charger magnet (10a) and a field adjustment unit (10b), wherein the superconductor bulk magnet (90a) comprises a bulk magnet bore (4), wherein the bulk magnet bore (4) contains a sample volume (5), wherein the background charger magnet (10a) comprises a charger bore (3), wherein the superconductor bulk magnet (90a) is arranged within the charger bore (3), wherein the background charger magnet (10a) and the field adjustment unit (10b) are arranged radially outside the bulk magnet bore (4), and wherein the superconductor bulk magnet (90a) has a critical temperature T c ; with the steps of:
step a) the magnet charger system (10) is charged, such that after this charging it generates a first magnetic field in the sample volume (5), wherein the superconductor bulk magnet (90a) has a temperature T, with T>T c (300);
step b) the superconductor bulk magnet (90a) is cooled to a temperature T c (400);
step c) the magnet charger system (10) is discharged, what inductively charges the superconductor bulk magnet (90a), such that the superconductor bulk magnet (90a) traps a second magnetic field in the sample volume (5) (500); characterized in that before step a), a correlation between a magnetic field applied by the magnet charger system (10) from outside the superconductor bulk magnet (90a) and a resulting magnetic field trapped by the superconductor bulk magnet (90a) is determined at least approximately in the sample volume (5) (100, 550), and that in step a), the field adjustment unit (10b) is set such that the first magnetic field generated by the magnet charger system (10) in the sample volume (5) comprises a homogeneous magnetic field component and at least one non-homogeneous magnetic field component (300), wherein said at least one non-homogeneous field component is chosen, using said correlation, such that the second magnetic field of step c) has a higher homogeneity than the first magnetic field of step a) in the sample volume. The invention provides a method of magnetizing a superconducting bulk magnet, with which a higher homogeneity of the trapped magnetic field of the superconducting bulk magnet may be achieved in a simple way.-
公开(公告)号：EP3822992A1
公开(公告)日：2021-05-19
申请号：EP19209166.8
申请日：2019-11-14
IPC分类号： H01F6/00 , G01R33/3815 , H01F6/04 , H01F13/00
摘要： The invention relates to a method for charging a superconductor magnet system (3) comprising coaxially a main superconductor bulk magnet (10) and a shield superconductor bulk magnet (11), the method comprising the following steps:
step a) arranging the superconductor magnet system (3) at least partially within a charger bore (6) of a charger magnet (2),
step b) with T main > T main crit and T shield > T shield crit , applying an electrical current I charger to the charger magnet (2) and increasing I charger to a first current I 1 >0,
step c) lowering T main to or below an operation temperature T main op of the main superconductor bulk magnet (10), with T main op main crit , while keeping T shield > T shield crit ;
step d) lowering I charger to a second current I 2 main is induced in the main superconductor bulk magnet (10);
step e) lowering T shield to or below an operation temperature T shield op of the shield superconductor bulk magnet (11), with T shield op shield crit ;
step f) increasing I charger to zero, wherein a shield persistent current IP shield is induced in the shield superconductor bulk magnet (11);
step g) removing the superconductor magnet system (3) from the charger bore (6) of the charger magnet (2), and keeping T main at or below T main op with T main op main crit as well as T shield at or below T shield op with T shield op shield crit ; with T main : temperature of the main superconductor bulk magnet (10); T main crit : critical temperature of the main superconductor bulk magnet (10); T shield : temperature of the shield superconductor bulk magnet (11); and T Shield crit : critical temperature of the shield superconductor bulk magnet (11). The invention allows to reduce the stray field of the superconductor magnet system, wherein less weight and space is required for shielding purposes.-
5.发明公开
公开(公告)号：EP3910651A1
公开(公告)日：2021-11-17
申请号：EP20174683.1
申请日：2020-05-14
发明人： Hinderer, Jörg , March, Stephen Alfred , Borgnolutti, Franck , Eshchenko, Dmitry , Heiss, Stephan , Bovier, Pierre-Alain
IPC分类号： H01F6/04 , H01F6/06 , H01F13/00 , G01R33/3815 , G01R33/3875
摘要： A superconductor magnet system (2), comprising
- a cryostat (4) having a room temperature bore (10),
- a superconductor bulk magnet (5), contained in the cryostat (4) and arranged coaxially with the room temperature bore (10), and
- a cryogenic cooling system (12) adapted for cooling the superconductor bulk magnet (5),
wherein the superconductor bulk magnet (5) comprises at least N axially stacked bulk sub-magnets (6a-6c), with N≥3,
wherein the bulk sub-magnets (6a-6c) are substantially ring shaped and arranged coaxially with the room temperature bore (10),
wherein between each two axially neighboring bulk sub-magnets (6a-6c), an intermediate body (7a-7b) is arranged,
wherein the intermediate bodies (7a-7b) are substantially ring-shaped and arranged coaxially with the room temperature bore (10),
and the bulk sub-magnets (6a-6c) are supported on the intermediate bodies (7a-7b),
is characterized in that the intermediate bodies (7a-7b) are made from a non-metallic thermal insulator material, having a specific thermal conductivity smaller than a specific thermal conductivity of the material of the bulk sub-magnets (6a-6c),
and that the cryogenic cooling system (12) is adapted for independently controlling the temperature of each bulk sub-magnet (6a-6c),
wherein for each bulk sub-magnet (6a-6c), there is
- a temperature sensor (16a-16c) for sensing the temperature of the respective bulk sub-magnet (6a-6c), and
- an adjustment unit (13a-13c) for adjusting a heating power and/or a cooling power at the respective bulk sub-magnet (6a-6c). The invention provides a superconductor magnet systems based on a superconductor bulk magnet, with which an increased homogeneity of a generated magnetic field may be achieved in a simple way.-
6.发明公开
公开(公告)号：EP3657193A1
公开(公告)日：2020-05-27
申请号：EP18207267.8
申请日：2018-11-20
IPC分类号： G01R33/3815 , H01F6/00 , H01F6/04 , H01F13/00
摘要： The invention relates to a method for magnetizing a superconductor bulk magnet (21), with the following steps:
- step a) (202) placing the superconductor bulk magnet (21) inside a charger bore (3) of an electrical charger magnet (1), and
step a') (204) placing a field correction unit (31) at least partially inside a superconductor bore (7) of the superconductor bulk magnet (21); followed by
- step b) (206, 216) applying at least one electrical current (I 0 ) to the charger magnet (1), thus generating with the charger magnet (1) a magnetic field (4) which is applied to the superconductor bulk magnet (21) from the outside, wherein a temperature T bulk of the superconductor bulk magnet (21) is above a critical temperature T c of the superconductor bulk magnet (21), and
step b') (217) applying at least one auxiliary electrical current (I 1 , I 2 , I 3 ) to the field correction unit (31), thus generating an auxiliary magnetic field (53; 63; 73) which is applied to the superconductor bulk magnet (21) from within the superconductor bore (7), wherein T bulk > T c ; followed by
- step c) (208, 218) lowering T bulk below T c ; followed by
- step d) (210, 220) turning off the at least one electrical current (I 0 ) at the charger magnet (21), wherein T bulk c , and
step d') (221) turning off the at least one auxiliary electrical current (I 1 , I 2 , I 3 ) at the field correction unit (31), wherein T bulk c ; followed by
- step e) (228) removing the superconductor bulk magnet (21) from the charger bore (3) and keeping T bulk c . The invention provides a method of magnetizing a superconducting bulk magnet, with which a higher homogeneity of the trapped magnetic field of the superconducting bulk magnet can be obtained in a simple way.
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.012 秒)
