"54" . "Mayoral, M.-L." . "http://iopscience.iop.org/0741-3335/54/7/074005/pdf/0741-3335_54_7_074005.pdf" . . . "000305891500006" . "JET scrape-off-layer ionization at lower hybrid wave launching" . "Ongena, J." . "We present in this paper modelling of the JET scrape-off layer (SOL) including direct SOL ionization by launched lower hybrid (LH) waves. For that purpose, the two-dimensional fluid code EDGE2D-NIMBUS was modified in order to account for possible enhanced ionization in the SOL, due to the LH power absorbed by the electrons in a layer extending in the radial direction from the launcher. By taking the direct LH SOL ionization into account, the observed modification of the density in front of the LH antenna during a LH power and gas injection, can be explained. The JET grill private SOL limiters, acting as sinks for the particles, are also included in the model. We compare the efficiency of gas puffing from the top and the outer mid-plane for SOL density enhancement and improvement in LH coupling. The observed reduction of the temporal variation of the LH wave reflection coefficient and of measured saturated currents in the SOL during ELMs, is explained. The density depletion"@en . "JET scrape-off-layer ionization at lower hybrid wave launching"@en . . . "143715" . "JET scrape-off-layer ionization at lower hybrid wave launching"@en . "Parail, V." . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . . . "2"^^ . "0741-3335" . . "LH wave; plasma; LH grill; electrons; SOL; JET; ELMs"@en . "Jacquet, P." . . "13"^^ . . . "Mailloux, J." . . "[3DC3A4A81A93]" . . "Stamp, M." . . . "Silva, C." . "RIV/61389021:_____/12:00377643" . "11"^^ . "We present in this paper modelling of the JET scrape-off layer (SOL) including direct SOL ionization by launched lower hybrid (LH) waves. For that purpose, the two-dimensional fluid code EDGE2D-NIMBUS was modified in order to account for possible enhanced ionization in the SOL, due to the LH power absorbed by the electrons in a layer extending in the radial direction from the launcher. By taking the direct LH SOL ionization into account, the observed modification of the density in front of the LH antenna during a LH power and gas injection, can be explained. The JET grill private SOL limiters, acting as sinks for the particles, are also included in the model. We compare the efficiency of gas puffing from the top and the outer mid-plane for SOL density enhancement and improvement in LH coupling. The observed reduction of the temporal variation of the LH wave reflection coefficient and of measured saturated currents in the SOL during ELMs, is explained. The density depletion" . . . "JET scrape-off-layer ionization at lower hybrid wave launching" . "RIV/61389021:_____/12:00377643!RIV13-GA0-61389021" . "Belo, P." . . . "Petr\u017E\u00EDlka, V\u00E1clav" . "Fuchs, Vladim\u00EDr" . "P(GA202/07/0044), P(GAP205/10/2055), P(LG11018)" . "Plasma Physics and Controlled Fusion" . "7" . "Ekedahl, A." . "Corrigan, G." . . . "Goniche, M." . . "10.1088/0741-3335/54/7/074005" . .