1st Asia Pacific Transport Working Group (APTWG) International Conference

June 14 - 17, 2011
National Institute for Fusion Science
322-6 Oroshi-cho, Toki-City, Gifu, 509-5292, Japan

Index of Contents

  1. 1st APTWG International Conference Topics
  2. 1st APTWG International Conference Time Table
  3. 1st APTWG International Conference Presentations
  4. 1st APTWG International Conference Poster Presentations

1st APTWG International Conference Topics

The 1st AP TWG meeting will consist of:

  1. Special Plenary Topical Contributed Sessions
  2. Working Group Sessions
  3. Posters
  4. Summary session

Special Plenary Topical Contributed Sessions

We plan to hold two special interdisciplinary plenary contributed sessions. The topics of these sessions are:

P1) Why does the plasma rotate without external torque ?

Since the discovery of non-diffusive momentum transport in 1995, the plasma rotation without external torque has been a long term problem and topic of interest, for which the mechanism has not been clarified. Recently, theoretical models have been proposed to explain the rotation due to the intrinsic torque. In this session, experimental observations and theoretical models and simulations will be discussed to obtain a deeper understanding of the physics mechanism of intrinsic torque and rotation.

P2) Why is the transport of plasmas NOT determined by a local quantity ?

The non-local phenomena, where the core temperature increases associated with the drop of temperature at the edge, was found in 1995. After that, numerous experimental evidence for the coupling of core and edge transport in the plasma emerged. However, the physics mechanism to connect the transport at different plasma locations has been open to question. The observation of long-range turbulence and mesoscale structures suggests that the coupling between large scale or mesoscale and short-range turbulence would be a candidate to explain the mechanism. In this session, non-local phenomena for transport and mesoscale structures and possible models will be discussed.

Working Groups

Each working group includes both theory and experiment, with the ultimate goal being tests of theory, simulations and models against experiment. In addition, diagnostic needs and novel diagnostic ideas for a given area are also included in the scope of each working group.

A. Momentum transport Working Group (K.Itoh, Q.Ren)

This working group was created to increase focus on plasma rotation, which influences transport in a number of ways. Important topics for the meeting include:
  • Toroidal momentum transport, especially non-diffusive mechanisms, off-diagonal terms
  • Cross coupling between poloidal and toroidal rotations
  • Relation to the non-diffusivity in the particle transport
  • Theoretical modeling of intrinsic torque and rotation

B. Non-locality in transport Working Group (S.Inagaki, X.T.Ding)

The Non-locality in transport working group covers transport issues from the center to the edge plasma and focuses on the relation between core transport and edge transport. Topics include:
  • Coupling between core transport and edge transport
  • Long-range turbulence responsible for the non-locality in transport
  • Dynamics of Internal Transport Barriers ? including curvature transition
  • Physics of mesoscale transport structures (e.g. zonal flows, streamers, avalanches)

C. Edge turbulence and L-H transition Working Group (J.Dong, T.S. Hahm)

The Edge Physics group covers transport physics in the region just inside and outside the last closed flux surface, with emphasis on edge turbulence and the transition and back-transition between L-mode and H-mode plasmas. Topics of interest include:
  • Edge turbulence and zonal flow in the L-mode and H-mode Plasmas
  • Transport in the pedestal during the ELMs and other edge MHD activity
  • Mechanisms for L-H and H-L transitions, including the multi-states of H-modes
  • Physics of the density limit

D. 3D effects on transport physics Working Group (K.Ida, H.Park)

3D effects on transport physics Working Group is aiming to clarify the role of non-axisymmetric effects in tokamak, helical and RFP plasmas through intrinsic or applied 3D magnetic structures. Topics of interest include:
  • Controlling ELMs through stochastization of the magnetic field
  • The transition between the nesting and stochastic magnetic flux
  • 3D effect on the driving and damping mechanisms of zonal flows
  • Interplay between mean radial electric fields and zonal flows

1st APTWG International Conference Time Table

June 14 June 15 June 16 June 17
Tuesday Wednesday Thursday Friday
9:00-9:50
Registration/
Logistics/Welcome
9:00-9:55
Working Group Session D
9:00-9:55
Working Group Session A
9:00-10:00
Summary Session (C/D)
Break Break Break
9:50-11:30
Plenary Session I
10:10-11:30
Working Group Session D
10:10-11:30
Working Group Session A
10:30-11:30
Summary Session (A/B)
Lunch Lunch Lunch Conference Adjourns
12:50-13:45
Plenary Session I
12:50-14:10
Working Group Session C
12:50-14:10
Working Group Session B
13:30-15:00
Optional LHD tour
Break Break Break
13:55-15:35
Plenary Session II
14:25-15:45
Working Group Session C
14:25-15:45
Working Group Session B
Break Break&Group photo Break
15:45-17:15
Plenary Session II
16:15-18:15
Poster Session I (C/D)
16:00-18:00
Poster Session II (A/B)
17:20-20:15
Conference Dinner
(At the Oustat intl. Hotel)





1st APTWG International Conference Presentations


Tuesday,June 14,2011

9:00 - 9:40 On-Site Registration/Logistics

9:40 - 9:50 NIFS Deputy Director-General O. Kaneko Welcome

Plenary Session I: Why does the plasma rotate without external torque?

9:50 - 11:30 Chair: S.-I. Itoh
9:50 - PLI-OV P.H.Diamond Critical Issues in Intrinsic Rotation Bifurcations: What Can We Learn from Spontaneous Reversals?
10:30 - PLI-1 M.Kikuchi On the offset toroidal rotation in Neoclassical Toroidal Viscosity
11:00 - PLI-2 K.Nagaoka Perpendicular viscosity and intrinsic torque driven by ion temperature gradient in LHD

11:30 - 12:50 LUNCH

12:50 - 13:45 Chair: M. Yagi
12:50 - PLI-3 H.Jhang Role of intrinsic and external torque in the improvement of ion thermal confinement and internal transport barrier formation
13:20 - PLI-Dis K.Ida Discussion

13:45 - 13:55 BREAK


Plenary Session II: Why is the transpot of plasmas NOT determined by a local quantity ?

13:55 - 15:35 Chair: L.Yan
13:55 - PLII-OV S.Inagaki Experimental Evidence of Interaction between Edge and Core Transport in Toroidal Plasmas
14:35 - PLII-1 S.S.Kim Formation and back transition of internal transport barrier in reversed shear plasmas
15:05 - PLII-2 J.Li Magnetic-island-induced microinstability due to temperature island collapse in multiscale plasma turbulence

15:35 - 15:45 BREAK

15:45 - 17:15 Chair: S.Inagaki
15:45 - PLII-3 T.Yamada Observation of a streamer in drift wave turbulence
16:15 - PLII-4 Z.Shi Turbulence suppression during non-local transport on HL-2A tokamak
16:45 - PLII-Dis X.Ding Discussion

17:20 - 20:15 Conference Dinner at the Oustat Intl. Hotel
17:20 - Depart from NIFS (by bus)
18:15 - 20:15 Dinner at the Oustat Intl. Hotel





Wednesday,June 15,2011

D. 3D Effects on Transport Physics Working Group

9:00 - 9:55 Chair: J. Dong
9:00 - D-OV H.Yamada Overview of 3-D Effects on Transport Physics
9:30 - D-O1 H.K.Park 2-D or 3-D effect of the transient MHD instabilities on transport physics in toroidal devices

9:55 - 10:10 BREAK

10:10 - 11:30 Chair: T.Takizuka
10:10 - D-O2 S. Satake Simulation studies on neoclassical viscosity in 3-dimensional magnetic configurations
10:35 - D-O3 Y.M.Jeon Characteristics of First H-modes and Plan for ELM Control by n=2 RMP in KSTAR
11:00 - D-Dis H.K. Park Discussion

11:30 - 12:50 LUNCH


C. Edge Turbulence and L-H Transition Working Group

12:50 - 14:10 Chair: X. Gao
12:50 - C-OV G.S.Xu Overview on recent progress in edge turbulence and L-H
13:20 - C-O1 K.Toi Formation of Edge Transport Barrier in Stochastic Field Region on the Large Helical Device (LHD)
13:45 - C-O2 J.Dong Spatial and spectral characteristics of large scale structures in edge turbulent plasmas of HL-2A tokamak

14:10 - 14:25 BREAK

14:25 - 15:45 Chair: A. Fukuyama
14:25 - C-O3 K.Miki Towards a 1D model of L-I-H evolution dynamics
14:50 - C-O4 M.Sasaki Zonal flows induced by geodesic acoustic modes
15:15 - C-Dis J. Dong Discussion

15:45 - 16:15 BREAK (Group Photo at the Entrance Hall)

16:15 - 18:15 Poster Session I (C/D)





Thursday,June 16,2011

A. Momentum Transport Working Group

9:00 - 9:55 Chair: K. Ida
9:00 - A-OV K.Itoh An Overview for Momentum Transport Working Group
9:30 - A-O1 Y.Kosuga Entropic Theory for the Efficiency of Intrinsic Rotation Drive

9:55 - 10:10 BREAK

10:10 - 11:30 Chair: P.H. Diamond
10:10 - A-O2 J.-M.Kwon Gyrokinetic Simulation Study of Symmetry Breaking and Residual Stress Evolution at the TEM→ITG Transition
10:35 - A-O3 N.Guertler Prediction of zonal flows: A Reynolds stress response functional from comprehensive turbulence studies
11:00 - A-Dis K. Itoh Discussion

11:30 - 12:50 LUNCH


B. Non-locality in Transport Working Group
12:50 - 14:10 Chair: Y. Kishimoto
12:50 - B-OV X.T. Ding Review of the Non-local Transport Experiment
13:20 - B-O1 P.H. Diamond Turbulence Propagation and Entrainment as a Mechanism for 'Non-Locality'
13:45 - B-O2 N. Tamura Spatial Structure of Electron Heat Transport Revealed by a Nonlocal Transport Phenomenon in Large Helical Device

14:10 - 14:25 BREAK

14:25 - 15:45 Chair: X.T. Ding
14:25 - B-O3 K. Ida Curvature transition and spatiotemporal propagation of internal transport barrier in toroidal plasmas
14:50 - B-O4 M. Lesur Mitigating the Energetic Particle Transport by tuning the Nonlinear Behavior of Alfven Eigenmodes
15:15 - B-Dis S. Inagaki Discussion

15:45 - 16:00 BREAK

16:00 - 18:00 Poster Session II (A/B)





Friday,June 17,2011

Summary Session

9:00 - 10:00 Chair: H. Park Summary Session (C/D)
9:00 - C-Sum J.Dong Edge Turbulence and L-H Transition
9:30 - D-Sum K.Ida 3D Effects on Transport Physics

10:00 - 10:30 BREAK

10:30 - 11:30 Chair: H. Sugama Summary Session (A/B)
10:30 - A-Sum M.Kikuchi Momentum Transport
11:00 - B-Sum J.M.Kwon Non-locality in Transport

11:30 - 11:45 K.Ida Closing Remarks

11:45 - Meeting Adjourns

13:30 - 15:00 Optional LHD tour





1st APTWG International Conference Poster Presentations


Wednesday, June 15, 2011

Poster Session I (C/D)
C-O 1 K. Toi Formation of Edge Transport Barrier in Stochastic Field Region on the Large Helical Device (LHD)
C-O 2 J. Dong Spatial and spectral characteristics of large scale structures in edge turbulent plasmas of HL-2A tokamak
C-O 3 K. Miki Towards a 1D model of L-I-H evolution dynamics
C-O 4 M. Sasaki Zonal flows induced by geodesic acoustic modes
C-P 1 L. Yan The ELM characteristics of H-mode discharges on the HL-2A tokamak
C-P 2 K. Tanaka Turbulence response in H mode transition of LHD
C-P 3 B. Chatthong Numerical Study of L-H Transition Using Bifurcation Approach
C-P 4 H.-S. Kim L- to H-mode power threshold and H-mode characteristics in KSTAR
C-P 5 H. Saitoh Formation of peaked density profile of high-beta plasma in RT-1
C-P 6 Y. Nishimura An L-H transition scenario in quasi-neutral tokamak plasmas
C-P 7 T. Akiyama Evolution of edge parameters in improved modes with ETB in CHS and LHD
C-P 8 S.-H. Seo Frequency sweeping reflectometry on the KSTAR for density profile measurements
C-P 9 A. Fukuyama Modeling of edge transport barrier formation using the dynamic transport simulation code TASK/TX
C-P 10 H. Tanaka Blob/hole generation near the divertor leg in LHD
C-P 11 S. Banerjee Origin and evolution of coherent convective structures investigated using fast imaging in QUEST
C-P 12 S. Sugita Simulation Study on Non-diffusive Transport by Plasma Blob in Tokamak Scrape-off Layer
C-P 13 T. Oishi Beam Emission Spectroscopy Measurement for Density Fluctuations in Large Helical Device
C-P 14 W. Lee Microwave imaging refectometry for transport study on KSTAR
C-P 15 S. Ohshima Edge Fluctuation Measurement using Multiple Langmuir Probes in Heliotron J
C-P 16 K. Fujii Spectrally-resolved Fluctuation Measurement of the Balmer-α Line Emission from an LHD Plasma
C-P 17 R. Hager The nonlinear dispersion relation of geodesic acoustic modes
C-P 18 H. Igami Characteristics of electron heat transport around inflection points of the temperature profile during ECH
D-O 1 H.K Park 2-D or 3-D effect of the transient MHD instabilities on transport physics in toroidal devices
D-O 2 S. Satake Simulation studies on neoclassical viscosity in 3-dimensional magnetic configurations
D-O 3 Y.M. Jeon Characteristics of First H-modes and Plan for ELM Control by n=2 RMP in KSTAR
D-P 1 S. Matsuoka A new scheme to calculate the radial electric field and its application to a CERC plasma
D-P 2 S. Toda Study of Electric Field Pulsation in Helical Plasmas
D-P 3 A. Shimizu Radial Profile of Potential and Electric Field in the Low Density Core Plasma of LHD
D-P 4 M. Nunami Gyrokinetic Simulation Study on ITG Turbulent Transport in LHD with High Ion Temperature
D-P 5 T.-H. Watanabe Gyrokinetic simulations of zonal flow generation with three-dimensional effects in helical plasmas
D-P 6 S. Izumi Study of radial diffusion of energetic ions by high-m magnetic perturbations by DCOM code
D-P 7 F.T. Ming Observation of low mode number MHD activities by the tangentially viewing 2D VUV camera on LHD
D-P 8 S. Nishimura Impacts of resonant magnetic perturbations on stallarator plasmas
D-P 9 G. Park Kinetic Simulation of RMP-Induced Plasma Transport in Diverted Tokamak Geometry
D-P 10 S. Nishimura An application of generalized Taguchi’s formulation of neoclassical transport as a validation of the traditional moment equation approach
D-P 11 S. Ohdachi Stability analysis of the H-mode plasmas in the outward-shifted configurations in the Large Helical Device
D-P 12 M. Yokoyama Development and application of integrated transport code for helical plasmas
D-P 13 R. Seki First Application of Customized TASK3D Code for Transport Study in LHD
D-P 14 M. Sato Study of resistivity effect on MHD stability beta limit in LHD by TASK3D





Thursday, June 16, 2011

Poster Session II (A/B)
PLI- 1 M. Kikuchi On the offset toroidal rotation in Neoclassical Toroidal Viscosity
PLI- 2 K. Nagaoka Perpendicular viscosity and intrinsic torque driven by ion temperature gradient in LHD
PLI- 3 H. Jhang Role of intrinsic and external torque in the improvement of ion thermal confinement and internal transport barrier formation
A-O 1 Y. Kosuga Entropic Theory for the Efficiency of Intrinsic Rotation Drive
A-O 2 J.-M. Kwon Gyrokinetic Simulation Study of Symmetry Breaking and Residual Stress Evolution at the TEM→ITG Transition
A-O 3 N. Guertler Prediction of zonal flows: A Reynolds stress response functional from comprehensive turbulence studies
A-P 1 S. Murakami Simulation study of toroidal flow generation by ICRF minority heating
A-P 2 W. Lee Investigation of toroidal impurity rotation in KSTAR Ohmic discharges and effects of magnetic field structure on rotation
A-P 3 T. Takizuka On the analysis method for momentum transport experiments
A-P 4 H. Lee Measurement of ion temperature and toroidal rotation velocity in Heliotron J
A-P 5 H. Sugama Effects of symmetry properties on momentum balance and radial electric fields in toroidal plasmas
PLII- 1 S.S. Kim Formation and back transition of internal transport barrier in reversed shear plasmas
PLII- 2 J. Li Magnetic-island-induced microinstability due to temperature island collapse in multiscale plasma turbulence
PLII- 3 T. Yamada Observation of a streamer in drift wave turbulence
PLII- 4 Z. Shi Turbulence suppression during non-local transport on HL-2A tokamak
B-O 1 P.H. Diamond Turbulence Propagation and Entrainment as a Mechanism for 'Non-Locality'
B-O 2 N. Tamura Spatial Structure of Electron Heat Transport Revealed by a Nonlocal Transport Phenomenon in Large Helical Device
B-O 3 K. Ida Curvature transition and spatiotemporal propagation of internal transport barrier in toroidal plasmas
B-O 4 M. Lesur Mitigating the Energetic Particle Transport by tuning the Nonlinear Behavior of Alfven Eigenmodes
B-P 1 S. Inagaki Identification and Characterization of Fluctuations with Long Distance Correlation in LHD
B-P 2 W. Zhang Experimental study of electron scale density fluctuation on HT-7 Tokamak
B-P 3 M. Yagi Simulation study on non-local transport in toroidal plasmas
B-P 4 Y. Kishimoto The role of meso-scale structures on global profile relaxation and spectrum
B-P 5 H. Wang Mossy edge localized modes with lower-hybrid current drive and lithiumwall coatings on the EAST superconducting tokamak
B-P 6 K. Mukai Density modulation experiment in Heliotron J
B-P 7 M. Jiang The characteristics of edge localized modes on EAST with lower-hybrid current drive and Lithium coated wall
B-P 8 M. Nakata Nonlinear entropy transfer via zonal flows in gyrokinetic plasma turbulent transport
B-P 9 S. Tokunaga Avalanching heat transport in steady state internal transport barriers with reversed magnetic shear
B-P 10 S. Kubo On the cause of density clamping phenomena by ECRH in LHD
B-P 11 P. Liu Reciprocating probe measurements of L-H transition in LHCD H-mode on EAST
B-P 12 T. Ido Potential Fluctuations Associated with Energetic-Particle Induced Geodesic Acoustic Mode and Alfven eigenmodes in the LHD plasmas
B-P 13 N. Kasuya On Detection of a Global Mode Structure by Use of Turbulence Diagnostic Simulator