A new Langmuir probe design to measure plasma properties and toroidal correlations on the EAST
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We introduce a novel fast-reciprocating probe head installed on the EAST (Experiment Advanced Superconducting Tokamak) containing 12 graphite tips. This allows us to measure a variety of plasma parameters such as the plasma density, temperature, and space potential in the scrape-off layer (SOL). We will also acquire the data at high frequency thus measuring the ion saturation current, 𝐼𝑠𝑎𝑡, and the floating potential, 𝑉𝑓 , average and fluctuating values. Moreover, with poloidally separated tips, we measure the poloidal electric field, 𝐸𝜃 , at two toroidal locations, assuming a plasma flow dominated by the 𝐸 ×𝐵 drift this leads to the determination of the radial velocity. As a consequence, the turbulent radial flux will thus be determined. In the parallel direction, we have four tips that are aligned parallel with the magnetic field lines, thus making an angle of 4◦24′ to the horizontal direction. This unique design should allow the measurement of the toroidal wavenumber, 𝑘𝜙, a quantity rarely obtained in tokamaks. This new probe, with 7 tips for measuring the ion saturation current and 4 tips to measure the floating potentials, was used on the EAST during the 2023 summer campaign. We present the first experimental results obtained during an L-mode plasma
Abstract
We introduce a novel fast-reciprocating probe head installed on the EAST (Experiment Advanced Superconducting Tokamak) containing 12 graphite tips. This allows us to measure a variety of plasma parameters such as the plasma density, temperature, and space potential in the scrape-off layer (SOL). We will also acquire the data at high frequency thus measuring the ion saturation current, 𝐼𝑠𝑎𝑡, and the floating potential, 𝑉𝑓 , average and fluctuating values. Moreover, with poloidally separated tips, we measure the poloidal electric field, 𝐸𝜃 , at two toroidal locations, assuming a plasma flow dominated by the 𝐸 ×𝐵 drift this leads to the determination of the radial velocity. As a consequence, the turbulent radial flux will thus be determined. In the parallel direction, we have four tips that are aligned parallel with the magnetic field lines, thus making an angle of 4◦24′ to the horizontal direction. This unique design should allow the measurement of the toroidal wavenumber, 𝑘𝜙, a quantity rarely obtained in tokamaks. This new probe, with 7 tips for measuring the ion saturation current and 4 tips to measure the floating potentials, was used on the EAST during the 2023 summer campaign. We present the first experimental results obtained during an L-mode plasma
참고문헌 (36)
- Longwen Yan, "Fast reciprocating probe system on the HL-2A tokamak", Rev. Sci. Instrum, 76(9), pp.3001~ (2005)[DOI]
- Chu Zhou, "The Doppler Backscattering System on EAST Tokamak", Ph.D, pp.2014
- Chu Zhou, "Microwave Doppler reflectometer system in the experimental advanced superconducting tokamak", Rev. Sci. Instrum, 84(10) (2013)[DOI]
- Jasmine Schirmer, "Plasma turbulence studies using correlation Doppler reflectometry on the ASDEX Upgrade tokamak", Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, pp.707~708 (2004)
- T Tokuzawa, "Microwave reflectometer for density profile and fluctuation measurements on LHD", ~ (2004)
- Seong-Heon Seo, "Fluctuation effects on the plasma density profiles measured by using a frequency modulated continuous wave reflectometer", Plasma Phys. Control. Fusion, 65(1), pp.015010~ (2022)
- Ilya Shesterikov, "Development of the gas-puff imaging diagnostic in the TEXTOR tokamak", Rev. Sci. Instrum, 84(5) (2013)
- RJ Maqueda, "Gas puff imaging of edge turbulence", Rev. Sci. Instrum, 74(3), pp.2020~2026 (2003)
- Yinjia Zheng, "Investigation of gas puff imaging on HL-2A tokamak", Acta Phys. Sin, 56(3), pp.1452~1460 (2007)
- F. Li, "Development of the gas puffing imaging diagnostic on J-TEXT tokamak", Rev. Sci. Instrum, 92(4) (2021)
- GY Antar, "The poloidal distribution of turbulent fluctuations in the Mega-Ampere Spherical Tokamak", Phys. Plasmas, 12(3) (2005)
- JG Bak, "Investigation of SOL parameters and divertor particle flux from electric probe measurements in KSTAR", J. Nucl. Mater, 463, pp.424~427 (2015)
- Ph Drews, "Measurement of the plasma edge profiles using the combined probe on W7-X", Nucl. Fusion, 57(12), pp.126020~ (2017)
- C Ionita, "Radial transport in the far scrape-off layer of ASDEX Upgrade during L-mode and ELMy H-mode", Nucl. Fusion, 53(4), pp.043021~ (2013)
- JG Watkins, "Fast reciprocating langmuir probe for the DIII-D divertor", Rev. Sci. Instrum, 68(1), pp.373~376 (1997)[DOI]
- Fuming Li, "The fast reciprocating magnetic probe system on the J-TEXT tokamak", Rev. Sci. Instrum, 87(11) (2016)[DOI]
- J. G. Bak, "Fast reciprocating probe assembly for the KSTAR", Contrib. Plasma Phys, 46(5–6), pp.341~347 (2006)[DOI]
- N. Asakura, "Fast reciprocating probe system for local scrape-off layer measurements in front of the lower hybrid launcher on JT-60U", Rev. Sci. Instrum, 66(12), pp.5428~5432 (1995)[DOI]
- Evgeny V. Shun’ko, "Langmuir Probe in Theory and Practice" (2009), Universal-Publishers
- Ian H. Hutchinson, "Principles of plasma diagnostics", Plasma Phys. Control. Fusion, 44(12), pp.2603~ (2002)
- CK Tsui, "Swinging reciprocating mach probes for the high field side scrape-off layer in DIII-D", Rev. Sci. Instrum, 83(10) (2012)
- RW Schrittwieser, "A probe head for simultaneous measurements of electrostatic and magnetic Fluctuations in ASDEX Upgrade edge plasma", Contrib. Plasma Phys, 50(9), pp.860~865 (2010)
- R Dejarnac, "Flush-mounted Langmuir probes in the WEST tokamak divertor", Fusion Eng. Des, 163, pp.112120~ (2021)
- Maurizio Cacace, "Langmuir probes design for the actively cooled divertor baffle in WEST", Fusion Eng. Des, 93, pp.15~18 (2015)
- JA Tagle, "Probe edge measurements in JET X-point plasmas for various heating and plasma conditions", J. Nucl. Mater, 196, pp.409~414 (1992)
- F Brochard, "A first comparison between probes, fast imaging, and reflectometry synchronous measurements of edge turbulence in tore supra", Proc. 36th EPS Conf. on Plasma Physics, 33 (2009)
- P Devynck, "Shear effect on the radial profile of fluctuations measured by a reciprocating Langmuir probe in Tore Supra", Plasma Phys. Controlled Fusion, 42(3), pp.327~ (2000)
- Kwan-Yong Kim, "Simultaneous measurements of plasma parameters and blob characteristics at the far-SOL region using a hybrid probe in KSTAR", Fusion Eng. Des, 172, pp.112900~ (2021)
- S Lukes, "Conceptual design of reciprocating probes and materialtesting manipulator for tokamak COMPASS Upgrade", J. Instrum, 17(02), pp.C02007~ (2022)
- RA Pitts, "On the statistics of ELM filaments measures by fast low field side wall Langmuir probes on TCV", 34th European Physical Society Conference on Plasma Physics and Controlled Fusion (2007)
- Boštjan Končar, "Analysis of thermal response of new diagnostic probe in TCV", Fusion Eng. Des, 156, pp.111744~ (2020)
- Roman Schrittwieser, "Laser-heated emissive plasma probe", Rev. Sci. Instrum, 79(8) (2008)
- GY Antar, "Experimental evidence of intermittent convection in the edge of magnetic confinement devices", Phys. Rev. Lett, 87(6), pp.065001~ (2001)
- Ghassan Y Antar, "Universality of intermittent convective transport in the scrape-off layer of magnetically confined devices", Phys. Plasmas, 10(2), pp.419~428 (2003)
- G. Y. Antar, "Turbulence intermittency and burst properties in tokamak scrape-off layer", Phys. Plasmas, 8(5), pp.1612~1624 (2001)
- Sergei I. Krasheninnikov, "On scrape off layer plasma transport", Phys. Lett. A, 283(5–6), pp.368~370 (2001)