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Statements

Subject Item
n2:RIV%2F61389021%3A_____%2F12%3A00381973%21RIV13-GA0-61389021
rdf:type
n7:Vysledek skos:Concept
dcterms:description
COMPASS tokamak shots at low magnetic field feature overdense plasmas during the extended current flat-top phase. The first harmonic of the electron cyclotron emission is completely cutoff for O and X modes and so the emission caused by electron Bernstein waves (EBWs) propagating obliquely with respect to the magnetic field and undergoing so called EBW-X-O conversion process can be observed. We perform an angular scan of the EBW emission during a set of comparable shots in order to determine the optimum antenna direction. A weak dependence of the radiative temperature on the antenna angles indicates an influence of multiple reflections from the vessel wall. The low temperature at the mode conversion region is responsible for the collisional damping of EBW, which can explain several times lower measured radiative temperature than the electron temperature measured by the Thomson scattering system. COMPASS tokamak shots at low magnetic field feature overdense plasmas during the extended current flat-top phase. The first harmonic of the electron cyclotron emission is completely cutoff for O and X modes and so the emission caused by electron Bernstein waves (EBWs) propagating obliquely with respect to the magnetic field and undergoing so called EBW-X-O conversion process can be observed. We perform an angular scan of the EBW emission during a set of comparable shots in order to determine the optimum antenna direction. A weak dependence of the radiative temperature on the antenna angles indicates an influence of multiple reflections from the vessel wall. The low temperature at the mode conversion region is responsible for the collisional damping of EBW, which can explain several times lower measured radiative temperature than the electron temperature measured by the Thomson scattering system.
dcterms:title
First results from EBW emission diagnostics on COMPASS First results from EBW emission diagnostics on COMPASS
skos:prefLabel
First results from EBW emission diagnostics on COMPASS First results from EBW emission diagnostics on COMPASS
skos:notation
RIV/61389021:_____/12:00381973!RIV13-GA0-61389021
n7:predkladatel
n16:ico%3A61389021
n3:aktivita
n15:P n15:Z
n3:aktivity
P(7G10072), P(GA202/08/0419), Z(AV0Z20430508)
n3:cisloPeriodika
10
n3:dodaniDat
n20:2013
n3:domaciTvurceVysledku
n4:5444225 n4:3918211 n4:9984445 n4:7093012 n4:3465713 n4:2210762 n4:2083248 n4:3340600 n4:1482602
n3:druhVysledku
n10:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
136698
n3:idVysledku
RIV/61389021:_____/12:00381973
n3:jazykVysledku
n8:eng
n3:klicovaSlova
Overdense plasma; Conversion; Emission; Tokamaks; Elektron Bernstein waves
n3:klicoveSlovo
n17:Emission n17:Conversion n17:Tokamaks n17:Overdense%20plasma n17:Elektron%20Bernstein%20waves
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[646E9CE792EB]
n3:nazevZdroje
Review of Scientific Instruments
n3:obor
n9:BL
n3:pocetDomacichTvurcuVysledku
9
n3:pocetTvurcuVysledku
10
n3:projekt
n11:GA202%2F08%2F0419 n11:7G10072
n3:rokUplatneniVysledku
n20:2012
n3:svazekPeriodika
83
n3:tvurceVysledku
Urban, Jakub Fuchs, Vladimír Weinzettl, Vladimír Aftanas, Milan Preinhaelter, Josef Zajac, Jaromír Nanobashvili, S. Böhm, Petr Žáček, František Bílková, Petra
n3:wos
000311562900174
n3:zamer
n13:AV0Z20430508
s:issn
0034-6748
s:numberOfPages
3
n12:doi
10.1063/1.4733530