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Stefanikova E, Peterka M, Bohm P, Bilkova P, Aftanas M, Sos M, Urban J, Hron M, Panek R. Fitting of the Thomson scattering density and temperature profiles on the COMPASS tokamak. Rev Sci Instrum 2016; 87:11E536. [PMID: 27910584 DOI: 10.1063/1.4961554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A new technique for fitting the full radial profiles of electron density and temperature obtained by the Thomson scattering diagnostic in H-mode discharges on the COMPASS tokamak is described. The technique combines the conventionally used modified hyperbolic tangent function for the edge transport barrier (pedestal) fitting and a modification of a Gaussian function for fitting the core plasma. Low number of parameters of this combined function and their straightforward interpretability and controllability provide a robust method for obtaining physically reasonable profile fits. Deconvolution with the diagnostic instrument function is applied on the profile fit, taking into account the dependence on the actual magnetic configuration.
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Affiliation(s)
- E Stefanikova
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - M Peterka
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - P Bohm
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - P Bilkova
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - M Aftanas
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - M Sos
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - J Urban
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - M Hron
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
| | - R Panek
- Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 180 00 Prague, Czech Republic
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Bohm P, Aftanas M, Bilkova P, Stefanikova E, Mikulin O, Melich R, Janky F, Havlicek J, Sestak D, Weinzettl V, Stockel J, Hron M, Panek R, Scannell R, Frassinetti L, Fassina A, Naylor G, Walsh MJ. Edge Thomson scattering diagnostic on COMPASS tokamak: installation, calibration, operation, improvements. Rev Sci Instrum 2014; 85:11E431. [PMID: 25430338 DOI: 10.1063/1.4893995] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The core Thomson scattering diagnostic (TS) on the COMPASS tokamak was put in operation and reported earlier. Implementation of edge TS, with spatial resolution along the laser beam up to ∼1/100 of the tokamak minor radius, is presented now. The procedure for spatial calibration and alignment of both core and edge systems is described. Several further upgrades of the TS system, like a triggering unit and piezo motor driven vacuum window shutter, are introduced as well. The edge TS system, together with the core TS, is now in routine operation and provides electron temperature and density profiles.
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Affiliation(s)
- P Bohm
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - M Aftanas
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - P Bilkova
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - E Stefanikova
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - O Mikulin
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - R Melich
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - F Janky
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - J Havlicek
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - D Sestak
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - V Weinzettl
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - J Stockel
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - M Hron
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - R Panek
- Institute of Plasma Physics ASCR, Za Slovankou 1782/3, 18200 Prague, Czech Republic
| | - R Scannell
- CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - L Frassinetti
- School of Electrical Engineering, Division of Fusion Plasma Physics, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - A Fassina
- Consorzio RFX, Corso Stati Uniti, 4-35127 Padua, Italy
| | - G Naylor
- CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - M J Walsh
- ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St Paul lez Durance, France
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