Počet záznamů: 1  

Profile measurements in the plasma edge of mega amp spherical tokamak using a ball pen probe

  1. 1.
    0443592 - UFP-V 2016 RIV US eng J - Článek v odborném periodiku
    Walkden, N.R. - Adámek, Jiří - Allan, S. - Dudson, B.D. - Elmore, S. - Fishpool, G. - Harrison, J. - Kirk, A. - Komm, Michael
    Profile measurements in the plasma edge of mega amp spherical tokamak using a ball pen probe.
    Review of Scientific Instruments. Roč. 86, č. 2 (2015), č. článku 023510. ISSN 0034-6748
    Grant CEP: GA ČR(CZ) GAP205/12/2327; GA MŠk(CZ) LM2011021
    Institucionální podpora: RVO:61389021
    Klíčová slova: plasma * tokamak * ball pen probe
    Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
    Obor OECD: 2.11 Other engineering and technologies
    Impakt faktor: 1.336, rok: 2015

    The ball pen probe (BPP) technique is used successfully to make profile measurements of plasma potential, electron temperature, and radial electric field on the Mega Amp Spherical Tokamak. The potential profile measured by the BPP is shown to significantly differ from the floating potential both in polarity and profile shape. By combining the BPP potential and the floating potential, the electron temperature can be measured, which is compared with the Thomson scattering (TS) diagnostic. Excellent agreement between the two diagnostics is obtained when secondary electron emission is accounted for in the floating potential. From the BPP profile, an estimate of the radial electric field is extracted which is shown to be of the order ~1 kV/mand increases with plasma current. Corrections to the BPP measurement, constrained by the TS comparison, introduce uncertainty into the ER measurements. The uncertainty is most significant in the electric field well inside the separatrix.
    Trvalý link: http://hdl.handle.net/11104/0246278