Journal of Nuclear Science, Engineering and Technology (JONSAT)
In cooperation with the Iranian Nuclear Society

Measurement of plasma current in damavand tokamak using magnetic probes assembly as a discrete rogowski coil

Document Type : Research Paper

Authors

F. Shakeri 1
C. Rasouli 2

1 Physics Department, Kashan University, P.O.Box: 53153-87317, Kashan - Iran

2 Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 14399-51113, Tehran - Iran

https://doi.org/10.24200/nst.2020.1117
Abstract
In this paper, the magnetic probes assembly of Damavand tokamak which is being used for measurement of local magnetic fields, were utilized as a discrete Rogowski coil inside the vacuum vessel.An important advantage of this approach is the insensitivity of the new Rogowski coil to magnetic fields created by the external ohmic and equilibrium coils. Thae theoretical basis for the calculation of magnetic fields in the space between two probes was discussed and verified with experimental data. The lowest error was obtained in the second-order finite element computational method for discretizing Ampere's Law Integral. Moreover, the stability of measured currents considering error for magnetic field measurement was investigated. According to the results, it was found that Damavand Tokamak magnetic probes with the finite element second-order calculation method could be used as a more accurate discrete Rogowski coil than the machine main Rogowski coil.

Highlights

1.             E. Strait, Magnetic diagnostic system of the DIII-D tokamak, Rev. Sci. Instrum, 77, 023502 (2006).

 

2.             B. Pourshahab, et al., Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak, Phys Plasma, 23, 072501 (2016).

 

3.             B.A. Stevenson, 3D reconstruction of Plasma Equilibria using Magnetic Diagnostics on the Compact Toroidal Hybrid, PhD Thesis, Auburn University, Auburn, Alabama (2011).

 

4.             J.M. Moret, et al., Magnetic measurements on the TCV Tokamak, Rev. Sci. Instrum, 69, 2333 (1998).

 

5.             L. de Kock, et al., Design of the magnetic diagnostic for ITER, Revi. Sci. Instrum, 70, 452 (1999).

 

6.             D.A. Ward, J. La T. Exon, Using Rogowski coils for transient current measurements, Eng. Sci. Educ. J. 2, 105 (1993).

 

7.             L.A. Kojovic, et al., Practical aspects of Rogowski coil applications to relaying, IEEE PSRC Special Report, (2010).

 

8.             E. Abdi-Jalebi, R. McMahon, Simple and Practical Construction of High-Performance, Low-Cost Rogowski Transducers and Accompanying Circuitry for Research Applications, IEEE Instrum. Meas. Technol. Conf. Proc. 354 (2005).

 

9.             D.E. Shepard, D.W. Yauch, An overview of Rogowski coil current sensing technology, LEM DynAmp Inc., Ohio, USA, (2000).

 

10.          C. Qing, et al. Design and characteristics of two Rogowski coils based on printed circuit board, IEEE Trans. Instrum. Meas, 55(3), 939 (2006).

 

11.          Tokamak Damavand, AEOI, Technical Documentation. Moscow, (1994).

Keywords

Tokamak
Plasma current
Magnetic probes
Rogowski coil
1.             E. Strait, Magnetic diagnostic system of the DIII-D tokamak, Rev. Sci. Instrum, 77, 023502 (2006).
 
2.             B. Pourshahab, et al., Temporal and spatial evolution of runaway electrons at the instability moments in Damavand tokamak, Phys Plasma, 23, 072501 (2016).
 
3.             B.A. Stevenson, 3D reconstruction of Plasma Equilibria using Magnetic Diagnostics on the Compact Toroidal Hybrid, PhD Thesis, Auburn University, Auburn, Alabama (2011).
 
4.             J.M. Moret, et al., Magnetic measurements on the TCV Tokamak, Rev. Sci. Instrum, 69, 2333 (1998).
 
5.             L. de Kock, et al., Design of the magnetic diagnostic for ITER, Revi. Sci. Instrum, 70, 452 (1999).
 
6.             D.A. Ward, J. La T. Exon, Using Rogowski coils for transient current measurements, Eng. Sci. Educ. J. 2, 105 (1993).
 
7.             L.A. Kojovic, et al., Practical aspects of Rogowski coil applications to relaying, IEEE PSRC Special Report, (2010).
 
8.             E. Abdi-Jalebi, R. McMahon, Simple and Practical Construction of High-Performance, Low-Cost Rogowski Transducers and Accompanying Circuitry for Research Applications, IEEE Instrum. Meas. Technol. Conf. Proc. 354 (2005).
 
9.             D.E. Shepard, D.W. Yauch, An overview of Rogowski coil current sensing technology, LEM DynAmp Inc., Ohio, USA, (2000).
 
10.          C. Qing, et al. Design and characteristics of two Rogowski coils based on printed circuit board, IEEE Trans. Instrum. Meas, 55(3), 939 (2006).
 
11.          Tokamak Damavand, AEOI, Technical Documentation. Moscow, (1994).

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