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Pandey A, Bohm S, Carls A, Cordes C, Endler M, Fellinger J, Freundt S, Gallowski K, Hammond K, Hathiramani D, Isberner G, Kallmeyer JP, Krause M, Kügler J, Otte M, Pedersen TS, Rondeshagen D, Ruhnau J, Schröder T, Sieber T, Wendorf J. Pop-up Langmuir probe diagnostic in the water cooled divertor of Wendelstein 7-X. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:043503. [PMID: 38563720 DOI: 10.1063/5.0188738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 03/14/2024] [Indexed: 04/04/2024]
Abstract
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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Affiliation(s)
- A Pandey
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - S Bohm
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - A Carls
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - C Cordes
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - M Endler
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - J Fellinger
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - S Freundt
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - K Gallowski
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - K Hammond
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - D Hathiramani
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - G Isberner
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - J P Kallmeyer
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - M Krause
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - J Kügler
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - M Otte
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | | | - D Rondeshagen
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - J Ruhnau
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - T Schröder
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - T Sieber
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
| | - J Wendorf
- Max-Planck Institut für Plasmaphysik, Greifswald 17491, Germany
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Missirlian M, Firdaouss M, Richou M, Hernandez C, Gargiulo L, Bucalossi J, Brun C, Corre Y, Delmas E, Greuner H, Guillermin B, Gunn J, Hatchressian J, Jalageas R, Li Q, Lipa M, Lozano M, Luo G, Pocheau C, Roche H, Tsitrone E, Vignal N, Wang W, Saille A, Zago B. Manufacturing, testing and installation of the full tungsten actively cooled ITER-like divertor in the WEST tokamak. FUSION ENGINEERING AND DESIGN 2023. [DOI: 10.1016/j.fusengdes.2023.113683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Postmortem assessment of the WEST Fiber Bragg grating and thermocouple diagnostic performances with HADES. FUSION ENGINEERING AND DESIGN 2023. [DOI: 10.1016/j.fusengdes.2023.113525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Grosjean A, Donovan D, Johnson C, Gunn J, Guillemaut C, Fedorczak N, Klepper C, Unterberg E. Refining light impurity content estimates at the lower divertor based on experimental data in WEST. NUCLEAR MATERIALS AND ENERGY 2023. [DOI: 10.1016/j.nme.2023.101385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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Meng L, Xu J, Liu J, Cao L, Wang P, Li A, Yu L, Xu G, Wang L. Development of Langmuir probe array for the new lower tungsten divertor in EAST. FUSION ENGINEERING AND DESIGN 2022. [DOI: 10.1016/j.fusengdes.2022.113011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Fedorczak N, Gaspar J, Corre Y, Grosjean A, Courtois X, Gunn J, Mitteau R, Dejarnac R, Bucalossi J, Tsitrone E, Loarer T, Brezinsek S. Cross diagnostics measurements of heat load profiles on the lower tungsten divertor of WEST in L-mode experiments. NUCLEAR MATERIALS AND ENERGY 2021. [DOI: 10.1016/j.nme.2021.100961] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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