18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating 2014 (EC18) EPJ Web of Conferences Volume 87 (2015)

Nara, Japan 22-25 April 2014

Editor: Shin Kubo

ISBN: 978-1-5108-0174-5

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TABLE OF CONTENTS

Summary for the Theory Session at EC-18 ......................................................................................................................... 1 N.B. Marushchenko

Scattering of Diffracting Beams of Electron Cyclotron Waves by Random Density Fluctuations in Inhomogeneous Plasmas ....................................................................................................................................................... 4 H. Weber, O. Maj, E. Poli

Influence of Density Fluctuations on the O–X Mode Conversion and on Microwave Propagation.............................. 12 A. Köhn, T. Williams, R. Vann, E. Holzhauer, J. Leddy, M. O’Brien, M. Ramisch

Scattering of ECRF Waves by Edge Density Fluctuations and Blobs ............................................................................. 17 Abhay K. Ram, Kyriakos Hizanidis

Closure of the Single Fluid Magnetohydrodynamic Equations in Presence of Electron Cyclotron Current Drive....................................................................................................................................................................... 21 E. Westerhof, J. Pratt, B. Ayten

Computation of the Spitzer Function in Stellarators and Tokamaks with Finite Collisionality ................................... 25 Winfried Kernbichler, Gernot Kapper, Sergel V. Kasilov, N.B. Marushchenko

ECRH Scenarios with Selective Heating of Trapped/Passing Electrons in the W7-X Stellarator ................................ 31 N.B. Marushchenko, C.D. Beidler, V. Erckmann, J. Geiger, P. Helander, H.P. Laqua, H. Maassberg, Y. Turkin

On the Criteria Guiding the Design of the Upper Electron-Cyclotron Launcher for ITER ......................................... 37 E. Poli, C. Angioni, F.J. Casson, D. Farina, L. Figini, T.P. Goodman, O. Maj, O. Sauter, H.Weber, H. Zohm, G. Saibene, M. Henderson

EC Radiative Transport and Losses in DEMO-like High-Temperature Plasmas.......................................................... 43 F. Albajar, M. Bornatici, F. Engelmann

Development of Momentum Conserving Monte Carlo Simulation Code for ECCD Study in Helical Plasmas ................................................................................................................................................................................. 47 S. Murakami, S. Hasegawa, Y. Moriya

Assessment of the ITER EC Upper Launcher Performance............................................................................................ 51 L. Figini, D. Farina, E. Poli, O. Sauter, A. Bruschi, T.P. Goodman, Alessandro Moro, Paola Platania, Carlo Sozzi, Mario Cavinato, G. Saibene, M. Henderson

Summary of ECRH/ECCD Presentations at EC18........................................................................................................... 57 K. Nagasaki

Selected Highlights of ECH/ECCD Physics Studies in the TCV Tokamak..................................................................... 60 T.P. Goodman, S. Coda, B.P. Duval, D. Kim, O. Sauter, F. Felici, J. Decker

Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D ........................ 68 R.I. Pinsker, M.E. Austin, D.R. Ernst, A.M. Garofalo, B.A. Grierson, J. Hosea, T.C. Luce, A. Marinoni, G.R. McKee, R.J. Perkins, C.C. Petty, M. Porkolab, J.C. Rost, L. Schmitz, W.M. Solomon, G. Taylor, F. Turco

High Power ECRH and ECCD in Moderately Collisional ASDEX Upgrade H-modes and Status of EC System Upgrade ................................................................................................................................................................... 76 J. Stober, F. Sommer, C. Angioni, A. Bock, E. Fable, F. Leuterer, F. Monaco, S. Müller, M. Münich, B. Petzold, E. Poli, M. Schubert, H. Schütz, D. Wagner, H. Zohm, W. Kasparek

Experimental Characterization of Plasma Start-up Using ECRH in Preparation of W7-X Operation ....................... 82 M. Preynas, D. Aßmus, H. Igami, S. Kado, S. Kobayashi, S. Kubo, H.P. Laqua, T. Mutoh, K. Nagasaki, M. Otte, T. Shimozuma, T. Stange, Y. Yoshimura

Non Inductive Formation of an Extremely Overdense Spherical Tokamak by Electron Bernstein Wave Heating and Current Drive on LATE ..................................................................................................................... 88 Masaki Uchida, Yuto Noguchi, H. Tanaka, Takashi Maekawa

Long Pulse EBW Start-up Experiments in MAST ........................................................................................................... 93 V. Shevchenko, Y.F. Baranov, T. Bigelow, J.B. Caughman, S. Diem, C. Dukes, P. Finburg, J. Hawes, C. Gurl, J. Griffiths, J. Mailloux, M. Peng, A.N. Saveliev, Y. Takase, H. Tanaka, G. Taylor

42GHz ECRH Assisted Plasma Breakdown in Tokamak SST-1 ..................................................................................... 99 B.K. Shukla, S. Pradhan, Paresh Patel, Rajan Babu, Jatin Patel, Harshida Patel, Pragnesh Dhorajia, V. Tanna, P.K. Atrey, R Manchanda, Manoj Gupta, Shankar Joisa, C.N. Gupta, Raju Danial, Prashant Singh, R. Jha, D. Bora

Performance History and Upgrades for the DIII-D Gyrotron Complex....................................................................... 105 J. Lohr, J.P. Anderson, M. Cengher, R. Ellis, Y.A. Gorelov, E. Kolemen, T. Lambot, D.D. Murakami, L. Myrabo, S. Noraky, K.L. Parkin, D. Ponce, A. Torrezan

Machine Safety Issues with Respect to the Extension of ECRH Systems at ASDEX Upgrade ................................... 109 M. Schubert, Albrecht Herrmann, F. Monaco, Volker Rohde, H. Schütz, J. Stober, Thomas Vierle, Stefan Vorbrugg, D. Wagner, Dieter Zasche, Thomas Zehetbauer, Wolfgang Zeidner

Recent Upgrading of ECRH System and Studies to Improve ECRH Performance in the LHD................................. 115 H. Igami, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Takahashi, Shuji Kamio, S. Kobayashi, S. Ito, Y. Mizuno, K. Okada, R. Makino, S. Ogasawara, Kenya Kobayashi

High ßp Plasma Formation Using Off-Axis ECCD in Ohmic Heated Plasma in the Spherical Tokamak QUEST .............................................................................................................................................................. 121 Kishore Mishra, H. Zushi, H. Idei, M. Hasegawa, K. Hanada

A Megawatt-Level 28 GHz Heating System for the National Spherical Torus Experiment Upgrade........................ 127 G. Taylor, R. Ellis, E. Fredd, S.P. Gerhardt, N. Greenough, R.W. Harvey, J. Hosea, R. Parker, F. Poli, R. Raman, S. Shiraiwa, A.P. Smirnov, D. Terry, G. Wallace, S. Wukitch

Real-Time Feed-backed Anode Power Supply for 170GHz Gyrotron in KSTAR ....................................................... 131 Bong-Jun Seok, Il-kun Ahn, Seung-kyo Lee, Eun-yong Shim, Y.S. Bae, M. Joung, Jin-Hyun Joung

Study of Synergetic Effect of X2 and X3 EC Wave in KSTAR...................................................................................... 136 Y.S. Bae, J. Decker, J.H. Jeong, K.D. Lee

Demonstration of Sawtooth Period Control with EC Waves in KSTAR Plasma ......................................................... 140 J.H. Jeong, Y.S. Bae, M. Joung, D. Kim, T.P. Goodman, O. Sauter, K. Sakamoto, K. Kajiwara, Y. Oda, J.G. Kwak, W. Namkung, M.H. Cho, H. Park, J. Hosea, R. Ellis

Feedback-Controlled NTM Stabilization on ASDEX Upgrade ..................................................................................... 145 J. Stober, L. Barrera, K. Behler, A. Bock, A. Buhler, H. Eixenberger, L. Giannone, W. Kasparek, M. Maraschek, A. Mlynek, F. Monaco, E. Poli, C.J. Rapson, M. Reich, M. Schubert, W. Treutterer, D. Wagner, H. Zohm

Beam Propagation and Stray Radiation in the ITER EC H&CD Upper Launcher .................................................... 151 Paola Platania, A. Bruschi, D. Farina, L. Figini, T.P. Goodman, Alexandra Krause, M. Henderson, Alessandro Moro, G. Saibene, Matthieu Toussaint, Carlo Sozzi

Direct Measurement of Refracted Trajectory of Transmitting Electron Cyclotron Beam Through Plasma on the Large Helical Device ................................................................................................................................. 156 H. Takahashi, S. Kubo, T. Shimozuma, H. Igami, Y. Yoshimura, S. Ito, Sakuji Kobayasi, Y. Mizuno, K. Okada, Shuji Kamio, T. Mutoh, Masaki Osakabe, K. Nagasaki, N.B. Marushchenko, Y. Turkin

Long-Pulse Plasma Discharges by Upgraded ECH System in the LHD ....................................................................... 162 Y. Yoshimura, H. Kasahara, K. Nagasaki, M. Tokitani, N. Ashikawa, Y. Ueda, S. Ito, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, M. Nishiura, S. Kobayashi, Y. Mizuno, K. Okada, S. Ogasawara, R. Makino

Power Measurement System of ECRH on HL-2A .......................................................................................................... 167 H. Wang, Zhihong Lu, S. Kubo, Gangyu Chen, Chao Wang, Jun Zhou, Mei Huang, Jun Rao

Summary of ECE Presentations at EC-18 ....................................................................................................................... 173 G. Taylor

Status of the Design of the ITER ECE Diagnostic .......................................................................................................... 175 G. Taylor, M.E. Austin, J.H. Beno, S. Danani, R. Ellis, R. Feder, J.L. Hesler, A. Hubbard, D.W. Johnson, R. Kumar, S. Kumar, V. Kumar, A. Ouroua, H.K. Pandya, P. E. Phillips, C. Roman

New Approach to ECE Measurements Based on Hilbert-Transform Spectral Analysis............................................. 182 H.K. Pandya, Yuriy Divin

Computational Studies on ECE Spectrum for ITER, in the Presence of a Small Fraction of NonThermals and Radial Resolution Evolution for Oblique View....................................................................................... 188 P.V. Subhash, Yashika Ghai, H.K. Pandya, Amit K. Singh, A.M. Begam, P. Vasu

A Model of Multi-Pass Absorption of External EC Radiation at Initial Stage of Discharge in ITER........................ 194 P.V. Minashin, A.B. Kukushkin, R.R. Khayrutdinov, V.E. Lukash

Engineering Aspects of Design and Integration of ECE Diagnostic in ITER ............................................................... 199 V.S. Udintsev, G. Taylor, H.K. Pandya, M.E. Austin, N. Casal, R. Catalin, M. Clough, B. Cuquel, M. Dapena, J.-M. Drevon, R. Feder, J.P. Friconneau, T. Giacomin, J. Guirao, M. Henderson, S. Hughes, S. Iglesias

Correlation ECE diagnostic in Alcator C-Mod............................................................................................................... 205 C. Sung, A.E. White, N.T. Howard, D. Mikkelsen, J. Irby, R. Leccacorvi, R. Vieira, C. Oi, J. Rice, M. Reinke, C. Gao, P. Ennever, M. Porkolab, R. Churchill, C. Theiler, J. Walk, J. Hughes, A. Hubbard, M. Greenwald

Localised Microwave Bursts During ELMs on MAST ................................................................................................... 211 Simon Freethy, V. Shevchenko, Billy Huang, R. Vann

Spectroscopic Diagnostics of Superthermal Electrons with High-number Harmonic EC Radiation in Tokamak Reactor Plasmas ............................................................................................................................................... 216 P.V. Minashin, A.B. Kukushkin

Initial Data of Digital Correlation ECE with a Giga Hertz Sampling Digitizer ........................................................... 222 Hayato Tsuchiya, Shigeru Inagaki, Tokihiko Tokuzawa, Yoshio Nagayama

Summary of Technology Sessions at EC18...................................................................................................................... 227 Gregory G. Denisov

A Study of Mode Purity Improvement in the ITER Relevant Transmission Line ....................................................... 230 Y. Oda, Ryosuke Ikeda, K. Kajiwara, Koji Takahashi, K. Sakamoto

Development of Mode Conversion Waveguides at KIT.................................................................................................. 236 Jianbo Jin, Gerd Gantenbein, John Jelonnek, Tomasz Rzesnicki, M. Thumm

Status of Europe’s Contribution to the ITER EC System.............................................................................................. 241 F. Albajar, G. Aiello, S. Alberti, F. Arnold, K. Avramidis, M. Bader, R. Batista, R. Bertizzolo, T. Bonicelli, F. Braunmueller, C. Brescan, A. Bruschi, B. von Burg, K. Camino, G. Carannante, V. Casarin, A. Castillo

Remote-Steering Launchers for the ECRH System on the Stellarator W7-X .............................................................. 247 W. Kasparek, C. Lechte, B. Plaum, A. Zeitler, V. Erckmann, H.P. Laqua, M. Weißgerber, A. Bechtold, M. Busch, B. Szcepaniak

Recent Tests on 117.5 GHz and 170 GHz Gyrotrons...................................................................................................... 252 K. Felch, M. Blank, P. Borchard, S. Cauffman

Diamond Window Diagnostics for Nuclear Fusion Applications – Early Concepts..................................................... 256 F. Mazzocchi, G. Aiello, A. Meier, S. Schreck, P. Spaeh, D. Strauss, T. Scherer

Development of a Dual Frequency (110/138 GHz) Gyrotron for JT-60SA and Its Extension to an Oscillation at 82 GHz......................................................................................................................................................... 260 T. Kobayashi, S. Moriyama, A. Isayama, Masayuki Sawahata, Masayuki Terakado, Shinichi Hiranai, Kenji Wada, Yoshikatsu Sato, Jun Hinata, Kenji Yokokura, Katsumichi Hoshino, K. Sakamoto

Research and Development of 2-Frequency (110/138 GHz) FADIS for JT-60SA ECHCD System............................ 265 H. Idei, S. Moriyama, T. Kobayashi, A. Isayama, M. Sakaguchi, W. Kasparek

Development of Resonant Diplexers for High-Power ECRH – Status, Applications, Plans ........................................ 271 W. Kasparek, B. Plaum, C. Lechte, Z. Wu, H. Wang, M. Maraschek, J. Stober, D. Wagner, M. Reich, M. Schubert, G. Grünwald, F. Monaco, S. Müller, H. Schütz, V. Erckmann, N. Doelman, R. van den Braber

Development of a Millimeter-Wave Beam Position and Profile Monitor for Transmission Efficiency Improvement in an ECRH System ................................................................................................................................... 277 T. Shimozuma, S. Kobayashi, S. Ito, Y. Ito, S. Kubo, Y. Yoshimura, M. Nishiura, H. Igami, H. Takahashi, Y. Mizuno, K. Okada, T. Mutoh

A Multifrequency Notch Filter for Millimeter Wave Plasma Diagnostics based on Photonic Bandgaps in Corrugated Circular Waveguides ................................................................................................................................ 283 D.Wagner, W. Bongers, W. Kasparek, F.Leuterer, F. Monaco, M. Münich, H. Schütz, J. Stober, M.Thumm, H. Brand

Recent Result of Gyrotron Operation in NIFS................................................................................................................ 287 S. Ito, T. Shimozuma, Y. Yoshimura, H. Igami, H. Takahashi, M. Nishiura, S. Kobayashi, Y. Mizuno, K. Okada, S. Kubo Author Index