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Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany.;Max Planck Inst Plasma Phys, D-85748 Garching, Germany..
KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Fusionsplasmafysik.
KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Fusionsplasmafysik.
KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Fusionsplasmafysik.
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Rekke forfattare: 12632017 (engelsk)Inngår i: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 12, s. 1194-1198Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Use of new 3-strap ICRF antennas with all-tungsten (W) limiters in ASDEX Upgrade results in a reduction of the W sources at the antenna limiters and of the W content in the confined plasma by at least a factor of 2 compared to the W-limiter 2-strap antennas used in the past. The reduction is observed with a broad range of plasma shapes. In multiple locations of antenna frame, the limiter W source has a minimum when RF image currents are decreased by cancellation of the RF current contributions of the central and the outer straps. In JET with ITER-like wall, ITER-like antenna produces about 20% less of main chamber radiation and of W content compared to the old A2 antennas. However the effect of the A2 antennas on W content is scattered depending on which antennas are powered. Experiments in JET with trace nitrogen (N-2) injection show that a presence of active ICRF antenna close to the midplane injection valve has little effect on the core N content, both in dipole and in -90 degrees phasing. This indicates that the effect of ICRF on impurity transport across the scape-off-layer is small in JET compared to the dominant effect on impurity sources leading to increased impurity levels during ICRF operation.

sted, utgiver, år, opplag, sider
ELSEVIER , 2017. Vol. 12, s. 1194-1198
Emneord [en]
ICRF, RF sheath, Three-strap, 3-strap, ASDEX Upgrade, JET, ILW, A2 antenna, ILA, Sputtering
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Identifikatorer
URN: urn:nbn:se:kth:diva-270580DOI: 10.1016/j.nme.2016.10.026ISI: 000417293300197Scopus ID: 2-s2.0-85007482698OAI: oai:DiVA.org:kth-270580DiVA, id: diva2:1413815
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20200311

Tilgjengelig fra: 2020-03-11 Laget: 2020-03-11 Sist oppdatert: 2020-05-11

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Menmuir, SheenaBergsåker, HenricBykov, IgorFrassinetti, LorenzoGarcia-Carrasco, AlvaroHellsten, TorbjörnJohnson, ThomasPetersson, PerRachlew, ElisabethRatynskaia, SvetlanaRubel, MarekStefanikova, EsteraStröm, PetterTholerus, EmmiTolias, PanagiotisOlivares, Pablo VallejosWeckmann, ArminZhou, Yushun
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