Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00466022" target="_blank" >RIV/61389021:_____/16:00466022 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/1742-6596/768/1/012003" target="_blank" >http://dx.doi.org/10.1088/1742-6596/768/1/012003</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1742-6596/768/1/012003" target="_blank" >10.1088/1742-6596/768/1/012003</a>

Result language
angličtina
Original language name
Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak
Original language description
This paper reports experimental data obtained on the COMPASS tokamak by Langmuir probes embedded in the divertor tiles. The measured current-voltage (IV) probe characteristics were processed by the recently published first derivative probe technique for precise determination of the plasma potential and the electron energy distribution function (EEDF). Measurements were performed during L-mode hydrogen and deuterium plasmas with toroidal magnetic field BT =1.15 T, plasma current Ip=180 kA and averaged electron density ne = 8*1019 m−3. The spatial profile of the electron temperatures shows that in hydrogen plasmas in the vicinity of the inner and outer strike points the EEDF can be approximated by a bi-Maxwellian distribution, with a dominating low-energy electron population (4 - 7 eV) and a minority of higher energy electrons (12 - 25 eV). In the private flux region between the two strike points the electron energy distribution function is found to be Maxwellian with temperatures in the range of 7 - 10 eV. In the case of deuterium plasmas at similar conditions of the discharge the EEDFs are found to be always bi-Maxwellian.n
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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