High-heat flux ball-pen probe head in ASDEX-Upgrade
A new high heat flux ball-pen probe head installed on the midplane manipulator is currently being used in ASDEX-Upgrade (AUG). The probe was designed to withstand high heat fluxes making possible the investigation of the plasma edge under harsh conditions, such as low power H-mode. Composed of seven...
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| Veröffentlicht in: | Review of scientific instruments 2022-02, Vol.93 (2), p.023507-023507 |
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| creator | Grenfell, G. Adamek, J. Komm, M. Brida, D. Conway, G. D. Manz, P. Tolias, P. Eich, T. Sestak, D. Herrmann, A. Nishizawa, T. Stroth, U. |
| description | A new high heat flux ball-pen probe head installed on the midplane manipulator is currently being used in ASDEX-Upgrade (AUG). The probe was designed to withstand high heat fluxes making possible the investigation of the plasma edge under harsh conditions, such as low power H-mode. Composed of seven pins (four Langmuir probes, mounted in two Mach probe pairs, and three ball-pen probes), the new probe head allows us to measure several plasma parameters simultaneously and with high temporal resolution. A novel method to correct the sheath potential dynamically accounting for the total secondary electron emission is introduced together with applications to obtain the electron temperature and plasma potential profiles. The total secondary electron emission yield is obtained from particle in cell simulations in AUG condition and probe realistic impact angle with respect to the magnetic field. Finally, the probe capability to investigate turbulence around the separatrix of AUG is discussed. |
| doi_str_mv | 10.1063/5.0075846 |
| format | Article |
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D. ; Manz, P. ; Tolias, P. ; Eich, T. ; Sestak, D. ; Herrmann, A. ; Nishizawa, T. ; Stroth, U.</creator><creatorcontrib>Grenfell, G. ; Adamek, J. ; Komm, M. ; Brida, D. ; Conway, G. D. ; Manz, P. ; Tolias, P. ; Eich, T. ; Sestak, D. ; Herrmann, A. ; Nishizawa, T. ; Stroth, U. ; ASDEX Upgrade Team ; ASDEX Upgrade Team</creatorcontrib><description>A new high heat flux ball-pen probe head installed on the midplane manipulator is currently being used in ASDEX-Upgrade (AUG). The probe was designed to withstand high heat fluxes making possible the investigation of the plasma edge under harsh conditions, such as low power H-mode. Composed of seven pins (four Langmuir probes, mounted in two Mach probe pairs, and three ball-pen probes), the new probe head allows us to measure several plasma parameters simultaneously and with high temporal resolution. A novel method to correct the sheath potential dynamically accounting for the total secondary electron emission is introduced together with applications to obtain the electron temperature and plasma potential profiles. The total secondary electron emission yield is obtained from particle in cell simulations in AUG condition and probe realistic impact angle with respect to the magnetic field. 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D.</au><au>Manz, P.</au><au>Tolias, P.</au><au>Eich, T.</au><au>Sestak, D.</au><au>Herrmann, A.</au><au>Nishizawa, T.</au><au>Stroth, U.</au><aucorp>ASDEX Upgrade Team</aucorp><aucorp>ASDEX Upgrade Team</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High-heat flux ball-pen probe head in ASDEX-Upgrade</atitle><jtitle>Review of scientific instruments</jtitle><addtitle>Rev Sci Instrum</addtitle><date>2022-02-01</date><risdate>2022</risdate><volume>93</volume><issue>2</issue><spage>023507</spage><epage>023507</epage><pages>023507-023507</pages><issn>0034-6748</issn><issn>1089-7623</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>A new high heat flux ball-pen probe head installed on the midplane manipulator is currently being used in ASDEX-Upgrade (AUG). The probe was designed to withstand high heat fluxes making possible the investigation of the plasma edge under harsh conditions, such as low power H-mode. 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| identifier | ISSN: 0034-6748 |
| ispartof | Review of scientific instruments, 2022-02, Vol.93 (2), p.023507-023507 |
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| language | eng |
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| source | MEDLINE; AIP Journals Complete; SWEPUB Freely available online; Alma/SFX Local Collection |
| subjects | Electron emission Electron energy Electrons Heat flux Heat transfer Hot Temperature Scientific apparatus & instruments Sheaths Temperature Temporal resolution |
| title | High-heat flux ball-pen probe head in ASDEX-Upgrade |
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