D-Mag — a laboratory for studying plasma physics and diagnostics in strong magnetic fields

Jagielski, B.; Wenzel, U.; Pedersen, T. S.; Melzer, A.; Pandey, Arun; Mackel, F.

doi:10.1088/1748-0221/18/06/p06006

J. Inst.

2023

DOI: 10.1088/1748-0221/18/06/p06006

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D-Mag — a laboratory for studying plasma physics and diagnostics in strong magnetic fields

B. Jagielski

U. Wenzel

T. S. Pedersen

et al.

Abstract: We have set up a diagnostic magnet (D-Mag) laboratory for a wide range of applications in plasma physics. It consists of a superconducting magnet for field strengths of up to 5.9 T. The main purpose is to provide an experimental environment for the development of plasma diagnostics for nuclear fusion studies and the investigation of dusty plasmas in strong magnetic fields. We describe in the article the setup and operation of the D-Mag. Some applications are presented for the development of plasm… Show more

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2024

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Cited by 3 publications

References 19 publications

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Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X

Pandey,

Bohm,

Carls

et al. 2024

Review of Scientific Instruments

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The design, development, and successful implementation of pop-up Langmuir probes installed in the water-cooled divertor of W7-X are described. The probes are controlled by drive coils (actuators) installed behind the divertor plates. These drive coils make use of the magnetic field in W7-X to move the probe tips into and out of the plasma. The drive coils were installed in the vacuum vessel after extensively testing the durability of the coils and analyzing the criteria for safe operation. The probe design is carefully tailored for each of the 36 probe tips in order to be suitable for the different magnetic field configurations used in W7-X and ensure that the probes do not present leading edges to the magnetic flux tubes. An electronic bridge circuit is used for measurement to compensate for the effects of signal propagation time on the long cable lengths used. The diagnostic is integrated with the segment control of W7-X for automated operation and control of the diagnostic. The evaluation of the results from the plasma operation is presented after accounting for appropriate sheath expansion for negative bias voltage on the probes.

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Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X

Pandey,

Bohm,

Carls

et al. 2024

Review of Scientific Instruments

View full text Add to dashboard Cite

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Performance of ITER pressure gauges during deuterium operation in the large helical device

Wenzel,

Motojima,

Mackel

et al. 2024

Plasma Phys. Control. Fusion

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During deuterium campaigns on the heliotron large helical device (LHD), ITER pressure gauges with different cathode materials were used to measure the neutral pressure in the sub-divertor region. Throughout these campaigns, it was observed that the performance of the LaB6 cathodes was unsatisfactory, credited to the generation of neutrons impacting the gauges. Conversely, measurements taken with pressure gauges with a ZrC cathode performed well throughout the deuterium pulses. The ITER pressure gauge with the ZrC cathode could be operated with a very high electron current of 800 µA, thus improving the lower detection limit of the neutral pressure in LHD. With this design it was also possible to avoid jumps in the ion current within strong magnetic fields, improving the accuracy of the measurement from 15% uncertainty to 5%. These features allowed very precise neutral pressure measurements to be made in a fusion device with magnetic confinement. The total running time in the magnetic field was around 60 hours, less than the cathode life time of 350 hours.

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Performance of LaB₆-Emitters for Neutral Gas Pressure Gauges During Plasma Operation in the Large Helical Device

Haak,

Motojima,

Jagielski

et al. 2024

IEEE Trans. Plasma Sci.

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With the aim of providing precise and reliable neutral gas pressure measurements in plasma experiments, several types of neutral gas pressure gauges using LaB 6 -emitters were tested at the Large helical device (LHD) during the last four experimental campaigns. A significant failure rate of the neutral gas pressure gauges could be observed. While the reasons are still unclear, correlations between the failure of LaB 6 -emitters and deuterium plasma operation with neutron generation have been discovered and are discussed here. Activation of the LaB 6emitters at a higher heating current than during standard operation was carried out during the campaign as an attempt to improve their thermionic emission properties and resulted in changes to the surface structure that were detected by scanning electron microscopy.

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D-Mag — a laboratory for studying plasma physics and diagnostics in strong magnetic fields

Cited by 3 publications

References 19 publications

Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X

Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X

Performance of ITER pressure gauges during deuterium operation in the large helical device

Performance of LaB₆-Emitters for Neutral Gas Pressure Gauges During Plasma Operation in the Large Helical Device

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Product

Resources

About

D-Mag — a laboratory for studying plasma physics and diagnostics in strong magnetic fields

Cited by 3 publications

References 19 publications

Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X

Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X

Performance of ITER pressure gauges during deuterium operation in the large helical device

Performance of LaB6-Emitters for Neutral Gas Pressure Gauges During Plasma Operation in the Large Helical Device

Contact Info

Product

Resources

About

Performance of LaB₆-Emitters for Neutral Gas Pressure Gauges During Plasma Operation in the Large Helical Device