scholarly journals Development of a Real-Time Magnetic Field Measurement System for Synchrotron Control

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2140
Author(s):  
Joseph Vella Wallbank ◽  
Maria Amodeo ◽  
Anthony Beaumont ◽  
Marco Buzio ◽  
Vincenzo Di Capua ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Real Time ◽  
Measurement System ◽  
Nuclear Research ◽  
General System ◽  
Magnetic Field Measurement ◽  
European Organization ◽  
Precise Knowledge ◽  
Future Work ◽  
The Magnetic Field

The precise knowledge of the magnetic field produced by dipole magnets is critical to the operation of a synchrotron. Real-time measurement systems may be required, especially in the case of iron-dominated electromagnets with strong non-linear effects, to acquire the magnetic field and feed it back to various users. This work concerns the design and implementation of a new measurement system of this kind currently being deployed throughout the European Organization for Nuclear Research (CERN) accelerator complex. We first discuss the measurement principle, the general system architecture and the technology employed, focusing in particular on the most critical and specialized components developed, that is, the field marker trigger generator and the magnetic flux integrator. We then present the results of a detailed metrological characterization of the integrator, including the aspects of drift estimation and correction, as well as the absolute gain calibration and frequency response. We finally discuss the latency of the whole acquisition chain and present an outline of future work to improve the capabilities of the system.

scholarly journals Automatic system for the mapping of the VINCY cyclotron magnetic field

2006 ◽  
Vol 21 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Aleksandar Dobrosavljevic ◽  
Sasa Cirkovic ◽  
Djordje Kosutic ◽  
Ljubisa Vukosavljevic ◽  
Dragan Vranic
Keyword(s):  
Magnetic Field ◽  
Measurement System ◽  
Heavy Ions ◽  
Automatic Measurement ◽  
Median Plane ◽  
Magnetic Field Measurement ◽  
Hall Probe ◽  
Automatic Measurement System ◽  
The Magnetic Field ◽  
Operating Regimes

The VINCY Cyclotron is the main part of the TESLA Accelerator Installation at the Vinca Institute of Nuclear Sciences in Belgrade. It is an isochroous cyclotron for the acceleration of both light and heavy ions. The pole of its magnet has the diameter of 2000 mm; its bending limit is 134 MeV, while its focusing limit is 73 MeV. This paper describes the magnetic field measurement system that has been used for the shimming of the VINCY Cyclotron magnet i.e., for precise shaping of its sectors and plugs. It is an automatic measurement system based on the Hall-probe that moves in the median plane between the poles of the magnet. We have used this system to obtain precise maps of the magnetic field for different operating regimes of the cyclotron needed in the process of shimming. The overall measurement uncertainty was estimated to be in the range of ?0.02%.

scholarly journals Rancang Bangun Sistem Pengukuran Medan Magnet Menggunakan LabVIEW, CONTROLLER NI cRIO-9022, dan DTM-151 Digital Teslameter

2015 ◽  
Vol 5 (2) ◽  
pp. 133
Author(s):  
Musaffiriyan Rasyid Ghoni ◽  
Andi Dharmawan ◽  
Slamet Santosa
Keyword(s):  
Magnetic Field ◽  
Measurement System ◽  
Field Measurement ◽  
Control Function ◽  
Reading Speed ◽  
Data File ◽  
Stepper Motor ◽  
Magnetic Field Measurement ◽  
Motor Speed ◽  
The Magnetic Field

Abstrak                Pusat Teknologi Akselerator dan Proses Bahan (PTAPB) BATAN Yogyakarta sedang mengembangkan sistem pengukuran medan magnet untuk alat siklotron. Pengukuran medan magnet pada siklotron diperlukan untuk mengetahui besar dan arah dari medan magnet.        Sistem ini menggunakan LabVIEW untuk membuat aplikasi antarmuka (HMI) dan pemrograman sistem. Implementasi fungsi kendali menggunakan controller NI cRIO-9022 yang dirangkai dengan modul NI 9512, yang akan mengatur kerja komponen penggerak, yaitu stepper motor. Implementasi fungsi akuisisi data menggunakan DTM-151 Digital Teslameter untuk mengukur kuat medan magnet. Pengukuran  menggunakan bidang koordinat kartesian (x,y).            Sebuah magnet permanen digunakan sebagai objek uji pengukuran. Ukuran magnet uji lebih kecil dari dimensi pengukuran sistem sehingga dimensi pengukuran terhadap bidang magnet dibuat berukuran (100 x 100) mm. Koordinat posisi awal teslameter 1 dan teslameter 2, secara berurutan, adalah (430,720) dan (430,240). Pengujian dilakukan sebanyak 2 kali (2 posisi magnet yang berbeda). Masing-masing pengujian dilakukan 3 kali pengukuran sehingga didapatkan 6 file data. Dari jumlah file data tersebut didapatkan jumlah data dengan rata-rata 1.117 data setiap file-nya. Kecepatan putar motor yang digunakan saat pengujian adalah 25 mm/s. Laju pembacaan data sebesar 10 data/s, interval dari perubahan posisi ketika motor berputar bernilai 2,5 mm. Kata kunci—sistem pengukuran medan magnet, LabVIEW, controller,teslameter, stepper motor, metode kendali on-off, komunikasi serial. Abstract            Pusat Teknologi Akselerator dan Proses Bahan (PTAPB) BATAN Yogyakarta currently developing a magnetic field measurement system for cyclotron machine. Magnetic field measurement on cyclotron is required to determine the magnitude and direction of the magnetic field.            The system used LabVIEW to create an interface application (HMI) and system programming. The control function implemented by using controller NI cRIO-9022 combined with NI 9512 module, which would controlling the motion component, that isthe  stepper motor. The acquisition data function implemented by using DTM-151 Digital Teslameter to measure the magnetic field. The measurement works within the cartesian coordinate plane (x,y).            A permanent magnet was used as the measurement trial object. The size of the magnet was smaller than measurement dimension of the system therefore the  measurement dimension of the magnetic plane was made with the size of (100 x 100) mm. The initial position coordinate of the teslameter 1 and teslameter 2, respectively, set at (430,720) and (430,240). The trial was excuted 2 times (2 different magnet position). Each trial consist of 3 times measurement, so there’s 6 data file obtained. On those data file, there’s an average of 1.117 data on each file. The motor speed was set on 25 mm/s. The data reading speed was set on 10 data/s, which would caused a 2,5 mm interval on one single data.  Keywords—magnetic field measurement system, LabVIEW, controller, teslameter, stepper motor, on-off control methode, serial communication.

scholarly journals First in-orbit results of the vector magnetic field measurement of the High Precision Magnetometer onboard the China Seismo-Electromagnetic Satellite

2019 ◽  
Vol 71 (1) ◽  
Author(s):  
Bin Zhou ◽  
Bingjun Cheng ◽  
Xiaochen Gou ◽  
Lei Li ◽  
Yiteng Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Precision ◽  
Magnetic Field Measurement ◽  
Vector Data ◽  
Magnetic Field Data ◽  
Night Side ◽  
The Difference ◽  
The Magnetic Field ◽  
Ground Calibration ◽  
Data Calibration

Abstract The High Precision Magnetometer (HPM) is one of the main payloads onboard the China Seismo-Electromagnetic Satellite (CSES). The HPM consists of two Fluxgate Magnetometers (FGM) and the Coupled Dark State Magnetometer (CDSM), and measures the magnetic field from DC to 15 Hz. The FGMs measure the vector components of the magnetic field; while the CDSM detects the magnitude of the magnetic field with higher accuracy, which can be used to calibrate the linear parameters of the FGM. In this paper, brief descriptions of measurement principles and performances of the HPM, ground, and in-orbit calibration results of the FGMs are presented, including the thermal drift and magnetic interferences from the satellite. The HPM in-orbit vector data calibration includes two steps: sensor non-linearity corrections based on on-ground calibration and fluxgate linear parameter calibration based on the CDSM measurements. The calibration results show a reasonably good stability of the linear parameters over time. The difference between the field magnitude calculated from the calibrated FGM components and the magnitude directly measured by the CDSM is just 0.5 nT (1σ) when the linear parameters are fitted separately for the day- and the night-side. Satellite disturbances have been analyzed including soft and hard remanence as well as magnetization of the magnetic torquer, radiation from the Tri-Band Beacon, and interferences from the rotation of the solar wing. A comparison shows consistency between the HPM and SWARM magnetic field data. Observation examples are introduced in the paper, which show that HPM data can be used to survey the global geomagnetic field and monitor the magnetic field disturbances in the ionosphere.

scholarly journals Magnetic Recording Method (MRM) for Nondestructive Evaluation of Ferromagnetic Materials

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 630
Author(s):  
Tomasz Chady ◽  
Ryszard D. Łukaszuk ◽  
Krzysztof Gorący ◽  
Marek J. Żwir
Keyword(s):  
Magnetic Field ◽  
Magnetic Recording ◽  
Permanent Magnets ◽  
Steel Structure ◽  
Standard Technique ◽  
Magnetic Field Measurement ◽  
Destructive Testing ◽  
Recording Method ◽  
Nondestructive Testing Method ◽  
The Magnetic Field

This paper proposes and experimentally investigates a novel nondestructive testing method for ferromagnetic elements monitoring, the Magnetic Recording Method (MRM). In this method, the inspected element must be magnetized in a strictly defined manner before operation. This can be achieved using an array of permanent magnets arranged to produce a quasi-sinusoidal magnetization path. The magnetic field caused by the original residual magnetization of the element is measured and stored for future reference. After the operation or loading, the magnetic field measurement is repeated. Analysis of relative changes in the magnetic field (for selected components) allows identifying applied stress. The proposed research methodology aims to provide information on the steel structure condition unambiguously and accurately. An interpretation of the results without referring to the original magnetization is also possible but could be less accurate. The method can be used as a standard technique for NDT (Non-Destructive Testing) or in structural health monitoring (SHM) systems.

scholarly journals Noninvasive muscle activity imaging using magnetography

2020 ◽  
Vol 117 (9) ◽  
pp. 4942-4947 ◽  
Author(s):  
Rodolfo R. Llinás ◽  
Mikhail Ustinin ◽  
Stanislav Rykunov ◽  
Kerry D. Walton ◽  
Guilherme M. Rabello ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Contrast Media ◽  
Electrical Activity ◽  
Real Time ◽  
Human Body ◽  
Muscle Activity ◽  
Muscular Activity ◽  
Exponential Increase ◽  
Somatic Musculature ◽  
The Magnetic Field

A spectroscopic paradigm has been developed that allows the magnetic field emissions generated by the electrical activity in the human body to be imaged in real time. The growing significance of imaging modalities in biology is evident by the almost exponential increase of their use in research, from the molecular to the ecological level. The method of analysis described here allows totally noninvasive imaging of muscular activity (heart, somatic musculature). Such imaging can be obtained without additional methodological steps such as the use of contrast media.

scholarly journals Attitude Estimation of Underwater Vehicles Using Field Measurements and Bias Compensation

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 330 ◽  
Author(s):  
Nak Ko ◽  
Seokki Jeong ◽  
Suk-seung Hwang ◽  
Jae-Young Pyun
Keyword(s):  
Magnetic Field ◽  
Field Measurement ◽  
Field Measurements ◽  
Underwater Vehicle ◽  
Field Vector ◽  
Attitude Estimation ◽  
Magnetic Field Measurement ◽  
Euler Angles ◽  
Measured Field ◽  
The Magnetic Field

This paper proposes a method of estimating the attitude of an underwater vehicle. The proposed method uses two field measurements, namely, a gravitational field and a magnetic field represented in terms of vectors in three-dimensional space. In many existing methods that convert the measured field vectors into Euler angles, the yaw accuracy is affected by the uncertainty of the gravitational measurement and by the uncertainty of the magnetic field measurement. Additionally, previous methods have used the magnetic field measurement under the assumption that the magnetic field has only a horizontal component. The proposed method utilizes all field measurement components as they are, without converting them into Euler angles. The bias in the measured magnetic field vector is estimated and compensated to take full advantage of all measured field vector components. Because the proposed method deals with the measured field independently, uncertainties in the measured vectors affect the attitude estimation separately without adding up. The proposed method was tested by conducting navigation experiments with an unmanned underwater vehicle inside test tanks. The results were compared with those obtained by other methods, wherein the Euler angles converted from the measured field vectors were used as measurements.

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