Bolometer tomography on Wendelstein 7-X for study of radiation asymmetry

被引：31

作者：

Zhang, D. ^{[1
]}

Burhenn, R. ^{[1
]}

Beidler, C. D. ^{[1
]}

Feng, Y. ^{[1
]}

Thomsen, H. ^{[1
]}

Brandt, C. ^{[1
]}

Buller, S. ^{[1
]}

Reimold, F. ^{[1
]}

Hacker, P. ^{[1
]}

Laube, R. ^{[1
]}

Geiger, J. ^{[1
]}

Garcia Regana, J. M. ^{[2
]}

Smith, H. M. ^{[1
]}

Koenig, R. ^{[1
]}

Giannone, L. ^{[3
]}

Penzel, F. ^{[3
]}

Klinger, T. ^{[1
]}

Baldzuhn, J. ^{[1
]}

Bozhenkov, S. ^{[1
]}

Braeuer, T. ^{[1
]}

Brunner, J. K. ^{[1
]}

Buttenschoen, B. ^{[1
]}

Damm, H. ^{[1
]}

Endler, M. ^{[1
]}

Effenberg, F. ^{[4
]}

Fuchert, G. ^{[1
]}

Gao, Y. ^{[1
]}

Jakubowski, M. ^{[1
]}

Knauer, J. ^{[1
]}

Kremeyer, T. ^{[1
]}

Krychowiak, M. ^{[1
]}

Kwak, S. ^{[1
]}

Laqua, H. P. ^{[1
]}

Langenberg, A. ^{[1
]}

Otte, M. ^{[1
]}

Pablant, N. ^{[4
]}

Pasch, E. ^{[1
]}

Rahbarnia, K. ^{[1
]}

Pavone, A. ^{[1
]}

Rudischhauser, L. ^{[1
]}

Svensson, J. ^{[1
]}

Killer, C. ^{[1
]}

Windisch, T. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany

[2] CIEMAT, Lab Nacl Fus, Madrid 28040, Spain

[3] Max Planck Inst Plasma Phys, Garching, Germany

[4] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

来源：

NUCLEAR FUSION | 2021年 / 61卷 / 11期

关键词：

bolometer tomography; Wendelstein 7-X (W7-X); EMC3-EIRENE modeling; impurity radiation asymmetry; neoclassical parallel impurity transport; relative gradient smoothing; ion-impurity friction force; X-RAY TOMOGRAPHY; POLOIDAL ASYMMETRIES; PHYSICS; W7-AS; TRANSPORT; EMISSION; PLASMAS; DIVERTOR;

D O I：

10.1088/1741-4326/ac2778

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The algorithm for bolometer tomography at Wendelstein 7-X (W7-X) has been recently improved using a novel regularization functional, based on relative gradient smoothing of the sought radiation profile. It has been validated using radiation patterns provided by 3D modeling under real plasma conditions as phantoms and then applied to bolometer measurements performed during the first divertor operation phase of W7-X. The following results are presented: (1) edge-localized 2D radiation patterns with clearly resolved magnetic island radiation structures, (2) an up-down asymmetry in the impurity radiation that is not captured by the 3D edge plasma transport modeling, (3) reversal of the asymmetry with reversed magnetic field direction. Further analysis reveals a poloidal variation of the emissivity in the outer confined plasma region with a field-direction dependent asymmetry, also supported by the soft x-ray measurements. This asymmetry is considered to be related to asymmetric impurity distributions, driven by the pronounced ion-impurity friction force at the plasma edge where the collisionality of the W7-X plasma is sufficiently high to develop impurity asymmetry as predicted by neoclassical theory of parallel impurity transport.

引用

页数：19

共 71 条

[1] Parallel impurity dynamics in the TJ-II stellarator [J].

Alonso, J. A. ;

Velasco, J. L. ;

Calvo, I. ;

Estrada, T. ;

Fontdecaba, J. M. ;

Garcia-Regana, J. M. ;

Geiger, J. ;

Landreman, M. ;

McCarthy, K. J. ;

Medina, F. ;

Van Milligen, B. Ph ;

Ochando, M. A. ;

Parra, F. I. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2016, 58 (07)

[2] X-ray tomography on the TCV tokamak [J].

Anton, M ;

Weisen, H ;

Dutch, MJ ;

vonderLinden, W ;

Buhlmann, F ;

Chavan, R ;

Marletaz, B ;

Marmillod, P ;

Paris, P .

PLASMA PHYSICS AND CONTROLLED FUSION, 1996, 38 (11) :1849-1878

[3] PHYSICS AND ENGINEERING DESIGN FOR WENDELSTEIN-VII-X [J].

BEIDLER, C ;

GRIEGER, G ;

HERRNEGGER, F ;

HARMEYER, E ;

KISSLINGER, J ;

LOTZ, W ;

MAASSBERG, H ;

MERKEL, P ;

NUHRENBERG, J ;

RAU, F ;

SAPPER, J ;

SARDEI, F ;

SCARDOVELLI, R ;

SCHLUTER, A ;

WOBIG, H .

FUSION TECHNOLOGY, 1990, 17 (01) :148-168

[4] Benchmarking of the mono-energetic transport coefficients-results from the International Collaboration on Neoclassical Transport in Stellarators (ICNTS) [J].

Beidler, C. D. ;

Allmaier, K. ;

Isaev, M. Yu ;

Kasilov, S. V. ;

Kernbichler, W. ;

Leitold, G. O. ;

Maassberg, H. ;

Mikkelsen, D. R. ;

Murakami, S. ;

Schmidt, M. ;

Spong, D. A. ;

Tribaldos, V. ;

Wakasa, A. .

NUCLEAR FUSION, 2011, 51 (07)

[5] Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X [J].

Bosch, H. -S. ;

Wolf, R. C. ;

Andreeva, T. ;

Baldzuhn, J. ;

Birus, D. ;

Bluhm, T. ;

Braeuer, T. ;

Braune, H. ;

Bykov, V. ;

Cardella, A. ;

Durodie, F. ;

Endler, M. ;

Erckmann, V. ;

Gantenbein, G. ;

Hartmann, D. ;

Hathiramani, D. ;

Heimann, P. ;

Heinemann, B. ;

Hennig, C. ;

Hirsch, M. ;

Holtum, D. ;

Jagielski, J. ;

Jelonnek, J. ;

Kasparek, W. ;

Klinger, T. ;

Koenig, R. ;

Kornejew, P. ;

Kroiss, H. ;

Krom, J. G. ;

Kuehner, G. ;

Laqua, H. ;

Laqua, H. P. ;

Lechte, C. ;

Lewerentz, M. ;

Maier, J. ;

McNeely, P. ;

Messiaen, A. ;

Michel, G. ;

Ongena, J. ;

Peacock, A. ;

Pedersen, T. S. ;

Riedl, R. ;

Riemann, H. ;

Rong, P. ;

Rust, N. ;

Schacht, J. ;

Schauer, F. ;

Schroeder, R. ;

Schweer, B. ;

Spring, A. .

NUCLEAR FUSION, 2013, 53 (12)

[6] Measurements and correction of the 1/1 error field in Wendelstein 7-X [J].

Bozhenkov, S. A. ;

Otte, M. ;

Biedermann, C. ;

Jakubowski, M. ;

Lazerson, S. A. ;

Pedersen, T. Sunn ;

Wolf, R. C. .

NUCLEAR FUSION, 2019, 59 (02)

[7] Soft x-ray tomography measurements in the Wendelstein 7-X stellarator [J].

Brandt, C. ;

Schilling, J. ;

Thomsen, H. ;

Broszat, T. ;

Laube, R. ;

Schroeder, T. ;

Andreeva, T. ;

Beurskens, M. N. A. ;

Bozhenkov, S. A. ;

Brunner, K. J. ;

Card, A. ;

Cordes, C. ;

Damm, H. ;

Fuchert, G. ;

Gallowski, K. ;

Gutzmann, R. ;

Knauer, J. ;

Laqua, H. P. ;

Marquardt, M. ;

Nelde, Ph ;

Neuner, U. ;

Pasch, E. ;

Rahbarnia, K. ;

Recknagel, J. ;

Schuelke, M. ;

Scott, E. R. ;

Sieber, T. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2020, 62 (03)

[8] VERTICAL POLOIDAL ASYMMETRIES OF LOW-Z ELEMENT RADIATION IN THE PDX TOKAMAK [J].

BRAU, K ;

SUCKEWER, S ;

WONG, SK .

NUCLEAR FUSION, 1983, 23 (12) :1657-1668

[9] Pfirsch-Schluter impurity transport in stellarator edge plasmas with large radial gradients [J].

Braun, S. ;

Helander, P. .

THEORY OF FUSION PLASMAS: JOINT VARENNA-LAUSANNE INTERNATIONAL WORKSHOP, 2010, 260

[10] Pfirsch-Schluter impurity transport in stellarators [J].

Braun, S. ;

Helander, P. .

PHYSICS OF PLASMAS, 2010, 17 (07)

← 1 2 3 4 5 6 7 8 →