Radially scanning magnetic probes to study local helicity injection dynamics

Richner, Nathan J.; Bongard, Michael W.; Fonck, Raymond J.; Reusch, Joshua A.; Schaefer, Carolyn E.

doi:10.1063/1.5036527

Title: Radially scanning magnetic probes to study local helicity injection dynamics

Journal Article · Thu Jul 12 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5036527· OSTI ID:1461755

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Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics

Two new magnetic probes have been deployed on the Pegasus spherical tokamak to study the dynamics of local helicity injection non-solenoidal plasma start-up and current drive. The magnetic radial array probe consists of 15 pickup coils (~5 × 8 mm each) that measure B_z(R) over a 15 cm linear extent. The coils consist of traces embedded in a printed circuit board. Three coil designs are utilized to balance frequency response and coil sensitivity. Helmholtz coil measurements are used to measure coil and full assembly bandwidths (~2 MHz and ~200 kHz, respectively) and sensitivities (0.18/0.35/0.96 mV T^-1 s). The magnetic radial scanning probe is an array of Hall effect sensors that measure field strength (|B|177 mT) and direction at 8 spatial points (ΔR = 1.5 cm), supporting the studies of equilibrium field structure and low-frequency (≤5 kHz) current dynamics. It uses commercial surface-mount Hall effect sensors with chip-integrated amplifiers and compensators that are mounted in a 3-D printed frame. Helmholtz coil measurements indicate negligible cross-field gain nonlinearity and provide absolute calibration of the diagnostic. Both probes are constructed as an electrostatically shielded insertable air-side assembly that mounts within a radially translatable ultrahigh vacuum assembly from an existing probe.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-96ER54375

OSTI ID:: 1461755

Alternate ID(s):: OSTI ID: 1460027

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; Related Information: N.J. Richner, M.W. Bongard, R.J. Fonck, J.A. Reusch, and C.E. Schaefer, "Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics," DOI: 10.18138/1432455; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 2 works

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References (15)

Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics Richner, Nathan; Bongard, Michael; Fonck, Raymond Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB) https://doi.org/10.18138/1432455	dataset	July 2018
Hall probe measurements of the poloidal magnetic field in Compact Toroidal Hybrid plasmas Stevenson, B. A.; Knowlton, S. F.; Hartwell, G. J. Review of Scientific Instruments, Vol. 85, Issue 9 https://doi.org/10.1063/1.4894209	journal	September 2014
Continuous, edge localized ion heating during non-solenoidal plasma startup and sustainment in a low aspect ratio tokamak Burke, M. G.; Barr, J. L.; Bongard, M. W. Nuclear Fusion, Vol. 57, Issue 7, Article No. 076010 https://doi.org/10.1088/1741-4326/aa6f2b	journal	May 2017
High spatial resolution Hall sensor array for edge plasma magnetic field measurements Liu, Yuhong; Maurer, David A.; Navratil, Gerald A. Review of Scientific Instruments, Vol. 76, Issue 9 https://doi.org/10.1063/1.2018628	journal	September 2005
The upgraded Pegasus Toroidal Experiment Garstka, G. D.; Diem, S. J.; Eidietis, N. W. Nuclear Fusion, Vol. 46, Issue 8 https://doi.org/10.1088/0029-5515/46/8/s06	journal	July 2006
H-mode plasmas at very low aspect ratio on the Pegasus Toroidal Experiment Thome, K. E.; Bongard, M. W.; Barr, J. L. Nuclear Fusion, Vol. 57, Issue 2, Article No. 022018 https://doi.org/10.1088/0029-5515/57/2/022018	journal	September 2016
Development of internal magnetic probe for current density profile measurement in Versatile Experiment Spherical Torus Yang, J.; Lee, J. W.; Jung, B. K. Review of Scientific Instruments, Vol. 85, Issue 11 https://doi.org/10.1063/1.4886429	journal	November 2014
A Hall sensor array for internal current profile constraint Bongard, M. W.; Fonck, R. J.; Lewicki, B. T. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3475539	journal	October 2010
Non-inductively driven tokamak plasmas at near-unity βt in the P egasus toroidal experiment Reusch, J. A.; Bodner, G. M.; Bongard, M. W. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017966	journal	May 2018
Design of a dual sensor probe array for internal field measurement in Versatile Experiment Spherical Torus Jeong-hun, Yang; Chung, Kyoung-Jae; An, YoungHwa Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4739224	journal	October 2012
Magnetic measurements using array of integrated Hall sensors on the CASTOR tokamak Ďuran, Ivan; Hronová, Olena; Stöckel, Jan Review of Scientific Instruments, Vol. 79, Issue 10 https://doi.org/10.1063/1.2971209	journal	October 2008
Measurements of magnetic field fluctuations using an array of Hall detectors on the TEXTOR tokamak Ďuran, I.; Stöckel, J.; Mank, G. Review of Scientific Instruments, Vol. 73, Issue 10 https://doi.org/10.1063/1.1502018	journal	October 2002
Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup Bongard, Michael; Bodner, Grant; Burke, Marcus University of Wisconsin-Madison https://doi.org/10.18138/1489772	dataset	January 2019
Hall Effect Devices Grubbs, W. J. Bell System Technical Journal, Vol. 38, Issue 3 https://doi.org/10.1002/j.1538-7305.1959.tb03909.x	journal	May 1959
Hall Effect Devices Middelhoek, M. G. Sensors and Actuators A: Physical, Vol. 116, Issue 1 https://doi.org/10.1016/j.sna.2004.03.037	journal	October 2004

Cited By (3)

Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics Richner, Nathan; Bongard, Michael; Fonck, Raymond Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB) https://doi.org/10.18138/1432455	dataset	July 2018
Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma Burke, Marcus; Fonck, Raymond; McKee, George University of Wisconsin-Madison https://doi.org/10.18138/1435641	dataset	January 2018
Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup Bongard, Michael; Bodner, Grant; Burke, Marcus University of Wisconsin-Madison https://doi.org/10.18138/1489772	dataset	January 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
magnetic probe
helicity injection
local helicity injection
spherical tokamak
tokamak startup
electromagnetic interactions
plasma confinement
data acquisition
coils
electrical circuits
semiconductor devices
carbon based materials