scholarly journals Results on Ultra-Precise Magnet Yoke Sectors Assembly Tests

2014 ◽  
Vol 24 (3) ◽  
pp. 1-4 ◽  
Author(s):  
M. Modena ◽  
R. Leuxe ◽  
M. Struik
Keyword(s):  
Magnet Yoke

scholarly journals Numerical and Experimental Study on Melt Treatment for Large-Volume 7075 Alloy by a Modified Annular Electromagnetic Stirring

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 820 ◽  
Author(s):  
Min He ◽  
Zhifeng Zhang ◽  
Weimin Mao ◽  
Bao Li ◽  
Yuelong Bai ◽  
...  
Keyword(s):  
Large Volume ◽  
Electromagnetic Shielding ◽  
Electromagnetic Stirring ◽  
Iron Core ◽  
Internal Cooling ◽  
Melt Treatment ◽  
Shielding Ring ◽  
Magnetic Strength ◽  
7075 Alloy ◽  
Magnet Yoke

This study presents a modified annular electromagnetic stirring (M-AEMS) melt treatment suitable for a large-volume and high-alloyed aluminum alloy. A 3D computational model coupling an electromagnetic model with a macroscopic heat and fluid-flow model was established by using Ansoft Maxwell 3D and Fluent from ANSYS workbench, and the effects of the electromagnetic shielding ring, the height of the magnet yoke, the shape of the iron core, and the internal cooling mandrel on the electromagnetic, thermal and flow fields were studied numerically. Based on the optimal technical parameters, the effectivity of the M-AEMS process by using 7075 alloy was validated experimentally. The results show that a favorable electromagnetic field distribution can be achieved by changing the magnet yoke height, the iron-core shape and the electromagnetic shielding ring, and the melt temperature of the 7075 alloy can drop rapidly to the pouring temperature by imposing the internal cooling mandrel; compared with ordinary annular electromagnetic stirring, the M-AEMS process creates a lower magnetic strength near the melt top, beneficial for stabilizing the melt surface; meanwhile, it yields a higher magnetic strength near the melt bottom, which increases the shear rate and ensures an optimal stirring effect. Therefore, M-AEMS works more efficiently because the thermal and composition fields become uniform in a shorter time, which reduces the average grain size and the composition segregation, and a more stable melt surface can be obtained during treatment, which reduces the number of air and oxide inclusions in the melt.

Design of a Compact and Multi-Function Magnetic Field Steered Arc Source

2012 ◽  
Vol 152-154 ◽  
pp. 1698-1704 ◽  
Author(s):  
Wen Chang Lang ◽  
Bai Zhong Wu ◽  
Bin Gao
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Rotating Magnetic Field ◽  
Control Mode ◽  
Dc Motors ◽  
Ac Motors ◽  
Large Particles ◽  
Magnetic Field Generator ◽  
Spot Motion ◽  
Magnet Yoke

Based on the principle of the control of magnetic field on arc spot motion, a compact and multi-function magnetic field steered arc source has been designed in this paper. The rotating magnetic field generator driven by small DC motors or AC motors has been also equipped behind the base of the target materials of magnetic field steered arc source. The magnet yoke fixed on shaft will be driven by the motors so as to promote the rotation of permanent magnets which are rationally distributed on magnet yoke. The different distribution of permanent magnets will produce the rotating magnetic field with different configuration structures and then the purpose of multi-control mode can be achieved. Meanwhile, the dynamic rotating magnetic field with different configurations have been also produced in this design through employing the simple and compact arc source as well as the permanent magnet with different distributions in order to improve the discharge form of arc spots, control the trajectory of arc spots, improve the utilization of target materials and the uniformity of etching as well as reduce or inhibit the emission of large particles. At the same time, the high-quality film can be also prepared so as to realize the arc spot control with various forms in an arc source, satisfy the different demands and expand the application of arc ion plating.

scholarly journals Flux Loop Measurements of the Magnetic Flux Density in the CMS Magnet Yoke

2016 ◽  
Vol 30 (10) ◽  
pp. 2977-2980
Author(s):  
V. I. Klyukhin ◽  
N. Amapane ◽  
A. Ball ◽  
B. Curé ◽  
A. Gaddi ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Magnetic Flux Density ◽  
Magnet Yoke

scholarly journals Analysis of eddy current distributions in the CMS magnet yoke during the solenoid discharge

2005 ◽  
Vol 52 (3) ◽  
pp. 741-744 ◽  
Author(s):  
V.I. Klyukhin ◽  
D. Campi ◽  
B. Cure ◽  
A. Gaddi ◽  
H. Gerwig ◽  
...  
Keyword(s):  
Eddy Current ◽  
Current Distributions ◽  
Magnet Yoke

Precision Control for Sextupole Magnet Yoke in Designing and Manufacturing

2017 ◽  
Author(s):  
Chang-jun Ning ◽  
Chang-dong Deng ◽  
Lei Liu ◽  
Yong-ji Yu ◽  
Hua-yan He ◽  
...  
Keyword(s):  
Precision Control ◽  
Magnet Yoke

scholarly journals The CMS Magnetic Field Measuring and Monitoring Systems

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 169
Author(s):  
Vyacheslav Klyukhin ◽  
Austin Ball ◽  
Felix Bergsma ◽  
Henk Boterenbrood ◽  
Benoit Curé ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
Review Article ◽  
Magnetic Flux Density ◽  
Monitoring Systems ◽  
Superconducting Solenoid ◽  
Field Measuring ◽  
The Magnetic Field ◽  
Magnet Yoke

This review article describes the performance of the magnetic field measuring and monitoring systems for the Compact Muon Solenoid (CMS) detector. To cross-check the magnetic flux distribution obtained with the CMS magnet model, four systems for measuring the magnetic flux density in the detector volume were used. The magnetic induction inside the 6 m diameter superconducting solenoid was measured and is currently monitored by four nuclear magnetic resonance (NMR) probes installed using special tubes at a radius of 2.9148 m outside the barrel hadron calorimeter at ±0.006 m from the coil median XY-plane. Two more NRM probes were installed at the faces of the tracking system at Z-coordinates of −2.835 and +2.831 m and a radius of 0.651 m from the solenoid axis. The field inside the superconducting solenoid was precisely measured in 2006 in a cylindrical volume of 3.448 m in diameter and 7 m in length using ten three-dimensional (3D) B-sensors based on the Hall effect (Hall probes). These B-sensors were installed on each of the two propeller arms of an automated field-mapping machine. In addition to these measurement systems, a system for monitoring the magnetic field during the CMS detector operation has been developed. Inside the solenoid in the horizontal plane, four 3D B-sensors were installed at the faces of the tracking detector at distances X = ±0.959 m and Z-coordinates of −2.899 and +2.895 m. Twelve 3D B-sensors were installed on the surfaces of the flux-return yoke nose disks. Seventy 3D B-sensors were installed in the air gaps of the CMS magnet yoke in 11 XY-planes of the azimuthal sector at 270°. A specially developed flux loop technique was used for the most complex measurements of the magnetic flux density inside the steel blocks of the CMS magnet yoke. The flux loops are installed in 22 sections of the flux-return yoke blocks in grooves of 30 mm wide and 12–13 mm deep and consist of 7–10 turns of 45 wire flat ribbon cable. The areas enclosed by these coils varied from 0.3 to 1.59 m2 in the blocks of the barrel wheels and from 0.5 to 1.12 m2 in the blocks of the yoke endcap disks. The development of these systems and the results of the magnetic flux density measurements across the CMS magnet are presented and discussed in this review article.

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