Profile measurements of the electron temperature on the ASDEX Upgrade, COMPASS, and ISTTOK tokamak using Thomson scattering, triple, and ball-pen probes

0459970 - ÚFP 2017 RIV US eng J - Journal Article
Adámek, Jiří - Müller, H.W. - Silva, C. - Schrittwieser, R. - Ionita, C. - Mehlmann, F. - Costea, S. - Horáček, Jan - Kurzan, B. - Bílková, Petra - Böhm, Petr - Aftanas, Milan - Vondráček, Petr - Stöckel, Jan - Pánek, Radomír - Fernandes, H. - Figueiredo, H.
Profile measurements of the electron temperature on the ASDEX Upgrade, COMPASS, and ISTTOK tokamak using Thomson scattering, triple, and ball-pen probes.
Review of Scientific Instruments. Roč. 87, č. 4 (2016), č. článku 043510. ISSN 0034-6748. E-ISSN 1089-7623
R&D Projects: GA ČR(CZ) GA15-10723S; GA ČR(CZ) GAP205/12/2327; GA ČR(CZ) GA14-35260S; GA MŠMT(CZ) LM2011021
Institutional support: RVO:61389021
Keywords : ball-pen probe (BPP) * ASDEX Upgrade * Langmuir probe (LP) * ISTTOK (Instituto Superior Tecnico TOKamak) * COMPASS (COMPact ASSembly),
OECD category: 2.11 Other engineering and technologies
Impact factor: 1.515, year: 2016
http://scitation.aip.org/content/aip/journal/rsi/87/4/10.1063/1.4945797

The ball-pen probe (BPP) technique is used successfully to make profile measurements of the electron temperature on the ASDEX Upgrade (Axially Symmetric Divertor Experiment), COMPASS (COMPact ASSembly), and ISTTOK (Instituto Superior Tecnico TOKamak) tokamak. The electron temperature is provided by a combination of the BPP potential (Phi(BPP)) and the floating potential (V-fl) of the Langmuir probe (LP), which is compared with the Thomson scattering diagnostic on ASDEX Upgrade and COMPASS. Excellent agreement between the two diagnostics is obtained for circular and diverted plasmas and different heating mechanisms (Ohmic, NBI, ECRH) in deuterium discharges with the same formula T-e = (Phi(BPP) - V-fl)/2.2. The comparative measurements of the electron temperature using BPP/LP and triple probe (TP) techniques on the ISTTOK tokamak show good agreement of averaged values only inside the separatrix. It was also found that the TP provides the electron temperature with significantly higher standard deviation than BPP/LP. However, the resulting values of both techniques are well in the phase with the maximum of cross-correlation function being 0.8.
Permanent Link: http://hdl.handle.net/11104/0260118