LHD Research Forum

Jun 30, 2025, 9:00 AM → Jul 3, 2025, 7:00 PM Asia/Tokyo

C. Suzuki, G. Motojima, H. Funaba, H. Igami, H. Nakano, H. Takahashi, K. Mukai, K. Ogawa, M. Goto, M. Kobayashi, M. Nishiura, M. Shoji, M. Yoshinuma, N. Kenmochi, R. Ishikawa, R. Seki, R. Yanai, T. Kobayashi, Tokihiko Tokuzawa (NIFS), Y. Kawamoto, Y. Takemura

First of all, we would like to thank all proponents for submitting the experiment proposals for the upcoming LHD experiment campaign. We are now making the FY2025 LHD Research Forum program based on the submitted proposals. 

1)    Session Groups

Each session group of your first choice will be responsible for a presentation at the Forum.

SG1: Equilibrium & instability

SG2: Transport

SG3: Plasma start-up & heating physics

SG4: Energetic particle physics

SG5: Multiphase physics

SG6: Atomic & molecular physics

2)    Important notices on presentation

l  Each proposal requiring the LHD experiment time must be explained by the proponent and discussed in the forum. 

l  The presentation of each proposal should mention the following aspects.

①      How does it conclude the results of previous experiments and bring academic achievements that show clear progress?

②      How does it make the POST-LHD project more compelling to realize?

③      How does it articulate new developments and challenges in fusion science?

④      How is it an outstanding and highly interdisciplinary proposal?

l  Allocated time

①      1 proposal by 1 proponent: 4-min presentation + 4-min Q&A.

②      2 proposals by 1 proponent: 7-min presentation + 6-min Q&A in total.

③      3 proposals by 1 proponent: 10-min presentation + 8-min Q&A in total.

④      4 proposals by 1 proponent: 13-min presentation + 10-min Q&A in total.

⑤      5 proposals by 1 proponent: 16-min presentation + 12-min Q&A in total.

⑥      6 proposals by 1 proponent: 19-min presentation + 14-min Q&A in total.

⑦      7 proposals by 1 proponent: 22-min presentation + 16-min Q&A in total.

3)    Zoom connection info. (Available throughout the meeting)

https://us06web.zoom.us/j/85746390642

meeting ID: 857 4639 0642

passcode: Forum

 We look forward to discussing exciting experimental and theoretical ideas for the upcoming LHD experiment campaign with you in the forum soon.

Mon, June 30

#1

Convener: N. Kenmochi (SG1)

1 Opening

2 2872 Akinobu Matsuyama

Spatiotemporal structure of disturbance triggered by pure, doped, and massive hydrogen pellet injection [SG1]

3 3041 Caoxiang Zhu

Optimized Configurations with Enhanced Confinement in LHD [SG1]

4 2904 Hideo Nuga

Experimental measurement of bootstrap current [SG1]

5 3022, 3023 Kiyomasa WATANABE

Core MHD instability suppression by RMP field [SG1]

Study on suppression conditions of resistive interchange instability without pressure gradient degradation by external RMP [SG1]

6 2928 Nengchao Wang

Investigation and control of the magnetic island related e-ITB collapses [SG1]

7 3030 Seungho Lee

Study of mode coupling and non-resonant effects in RMP response [SG1]

#2

Convener: N. Kenmochi (SG1)

8 2876, 2877 Tomoko Kawate

Wolter x-ray optical system to measure high temperature plasmas [SG1]

Z Dependence of Temporal Evolution of Emission Spectra in Impurity Pellet Injection [SG6]

9 2937, 2939 Kazuo Toi

Excitation of stable Alfven eigenmodes by ice pellet injection in finite-beta plasmas heated by electron cyclotron waves and the destabilization by energetic ions [SG1]

Studies of intermittent ion temperature increases observed in reversed magnetic shear plasmas with counter neutral beam injection on LHD [SG2]

10 2869, 2870, 2871 Naoki Kenmochi

Investigation of the mechanism of intermittent transport phenomena during the formation of electron internal transport barriers [SG1]

Investigation of local and non-local turbulence during thermal pulse propagation by MECH injection [SG2]

Investigation of local and non-local turbulence during cold pulse propagation by TESPEL injection [SG2]

11 2987, 2998 Toshiki Kinoshita

Investigation of periodic instabilities preceding radiation collapse under perpendicular NBI [SG1]

Real-time suppression of turbulence for sustaining high-performance plasmas and investigation of collapse mechanisms [SG2]

#3

Convener: Y. Takemura (SG1)

12 3031 Shinsuke Satake

V&V of Multi-purpose optimized configuration in LHD [SG1]

13 3018, 3020 Shogo SHIMODE

Collisionality dependence study of the external RMP penetration threshold [SG1]

Study of the mechanism on shielding external RMP by plasmas [SG1]

14 3000, 3002, 3003, 3004 Yuki Takemura

Sawtooth Oscillation Excitation Conditions [SG1]

CDC Stabilization Conditions [SG1]

Driving Mechanism of Pellet-Triggered m/n = 2/1 Magnetic Islands [SG1]

Triggering and Frequency Mechanisms of Edge Instabilities [SG1]

15 2959, 2960 Yuya Suzuki

Prediction and control of radiative collapse using a camera and a deep-learning method [SG1]

Prediction and control of radiative collapse using a decision model [SG1]

#4

Convener: R. Yanai (SG3)

16 2929, 2916 Jialei Wang

Fast-ion phase space engineering by RF waves to actively control bursting SAWs [SG1]

Validation of p-11B fusion reactivity using MeV ICRF tail ions in LHD [SG4]

17 3045, 3026, 3033 Hiroe Igami

Observation of large bursting emissions during He beam injection [SG1]

Observation of electron cyclotron maser instability during the fundamental X-mode ECCD in the extremely low dense plasma [SG3]

Effect of the orbit of high energy ions on the frequencies of coherent ion cyclotron and lower hybrid harmonic emissions [SG4]

18 3001 Christopher Anthony Orrico

Model predictive density profile control with pellet fueling [SG3]

#5

Convener: H. Funaba (SG1)

19 3057, 3055 Dmitry Moseev

Exploration of thermal ICE in H and He [SG1]

Fast-ion stabilization of ETG [SG4]

20 2914, 2915 Alexander Knieps

Intrinsic threshold for detachment in outward-shifted configuration (3.9m) [SG1]

Active control of detachment with SSGP injection at threshold density [SG2]

21 2997 Hjördis Bouvain

Mitigation of tungsten induced plasma termination and identification of transient transport mechanisms [SG1]

22 2941 Ksenia Aleynikova

KBM Onset in LHD: Resistivity, Magnetic Shear, and Well Dependencies [SG1]

23 3007 Neha Chaudhary

Investigation of Shafranov shift for high beta configurations using a new method exploiting radially localized ECE measurements [SG1]

Tue, July 1

#6

Convener: M. Goto (SG6)

24 2931 Daniel Den Hartog

Measurement of Plasma Dynamics during Core Density Collapse (CDC) in LHD [SG1]

25 2889 Kenneth Hammond

Pellet injection into plasmas with stepped up heating power [SG1]

26 2911, 2912, 2930 Federico Nespoli

Joint Experiment on Effect of Impurities on Stellarator
Performance [SG2]

Effect of low-Z powder injection on density limit [SG5]

Siliconization via powder injection [SG5]

27 3051, 3024 Novimir Pablant

Trial of high-Z metal impurity pumpout by ICRF three-ion heating [SG2]

Tungsten spectroscopy to support atomic physics at fusion reactor relevant temperatures [SG6]

28 2878, 2881 Hisamichi Funaba

Partial pressure measurement of neutral gases by the Penning gauge spectroscopy [SG6]

Diagnostics of relativistic electrons by Thomson scattering in high electron temperature plasmas [SG2]

#7

Convener: Y. Kawamoto (SG4)

29 2909 shinji kobayashi

Stochastic acceleration using non-resonant microwave heating [SG4]

30 3052, 3053 Masaki Nishiura

Study on core density peaking and flattening in plasmas [SG4]

Causality of potential and temperature responses on local electron heating [SG2]

31 2896, 2897 Katsumi Ida

Impact of density gradient on turbulence anisotropy [SG2]

Deformation of ion velocity distribution and anisotropy of turbulence triggered by EP-driven MHD burst. [SG4]

32 2943, 2944 Hikona Sakai

Advanced turbulence control for achieving high-pressure plasma [SG2]

Investigation of direct interaction between fast-ion and turbulence [SG4]

#8

Convener: T. Tokuzawa (SG2)

33 2954, 2961, 2990 Kenji Tanaka

Investigation of density limit and improved confinement regime in high density regime [SG2]

Investigation of transport of pellet injected plasma of LHD and W7-X [SG2]

Experiments for the gyrokinetic validation of particle transport [SG2]

34 2979 Mikirou Yoshinuma

Development fast charge exchange spectroscopy using OCAM2K [SG2]

#9

Convener: K. Mukai (SG5)

35 3014, 2906, 2947 Ryohtaroh Ishikawa

Geodesic curvature dependence of anomalous transport [SG2]

Cyclic occurrence of thermal instability [SG6]

Detachment/reattachment cycles [SG5]

36 2949, 2946, 3035 Gen Motojima

Density limit relation to edge turbulence [SG2]

Neutral particle compression/pumping and detachment on high beta plasmas [SG5]

Investigation of Neutral Pressure Scaling with Density and Heating Power in LHD Divertor Plasmas [SG5]

37 3013 Tetsutarou Oishi

Effect of boron impurity powder injection on tungsten impurity transport in the LHD core plasma [SG2]

38 3021 Mingzheng Gong

Investigate turbulent heat transport inside density peaking and flattening plasmas [SG2]

39 2932 Ichihiro YAMADA

Experimental study of electron temperature anisotropy and non-Maxwellian distribution of electrons by using the LHD Thomson scattering system [SG2]

#10

Convener: T. Kobayashi (SG2)

40 2913 Kazunobu Nagasaki

Formation of electron ITB in NBI plasmas by fuelling control [SG2]

41 2986, 3005 Shigeru Inagaki

Non-Local Transport ~ Revisit ~ [SG2]

Collisionality-Dependent Turbulence Structure Formation in High-Density Plasmas [SG2]

42 2882 Fumiyoshi Kin

Investigation of ion heat transport in ITG-dominant Ti-ITB plasmas [SG2]

43 2980 Tatsuhiro Nasu

Investigation of high-k turbulence dependence on collision frequency [SG2]

44 3029 Takeshi Ido

Influence of energetic particles on the formation of the electric potential profiles and impurity transport [SG2]

45 2992, 2993 Daiki Nishimura

Geodesic curvature dependence of GAM characteristics [SG2]

Investigation of cross-scale coupling between Alfven eigenmode and turbulence [SG2]

#11

Convener: M. Yoshinuma (SG2)

46 2942, 2945 Tatsuya Kobayashi

Phase-space tomography experiment for MHD burst event [SG2]

Heat pulse propagation in magnetic island [SG2]

47 2890, 2891 Yuichi Kawachi

Investigation of interaction between broadband phase space dynamics and wide frequency range of fluctuations during the energetic particle induced MHD burst event [SG2]

Direct observation of bulk phase space dynamics during the
energetic particle driven Geodesic Acoustic Mode [SG2]

48 3015 Tokihiko Tokuzawa

Multi-scale turbulence response in spontaneous phenomena [SG2]

#12

Convener: T. Tokuzawa (SG2)

49 3050 Lennard Ceelen

Nonlinear Dynamic Validation of Heat Transport Models in Fusion Plasmas through Advanced Perturbative Heating Experiments [SG2]

50 2948, 2950 Branka Vanovac

Turbulence nT cross-phase study [SG2]

TEM physics studies [SG2]

51 3008, 3009 Daniel Carralero

Turbulence suppression by density gradient: a comparison to W7-X [SG2]

Reproduction of W7-X low density high performance scenario in LHD [SG2]

52 2933, 2951 Daniel Medina Roque

Study of the impact of small amounts of powder injection on impurity confinement and transport [SG2]

Study of the impact of different kinds of powder injection on impurity confinement and transport [SG2]

53 2883 Yunfeng Liang

Scenarios of Hot Ion Mode and Impact of Boron Concentration [SG2]

54 2995 Juan Gallego

Study of plasma density limit by density ramp-up discharges [SG2]

Wed, July 2

#13

Convener: K. Ogawa (SG4)

55 3062, 3061 Michael Zarnstorff

First measurements of aneutronic p-Li fusion reactions in a magnetically confined plasma [SG4]

Assessment of a Baffled Non-Resonant Divertor in LHD [SG5]

56 2899 Shuji Kamio

Study of the fast-ion acceleration by ICRF heating for p-11B fusion reaction [SG4]

57 2917 Wataru Hayashi

Diagnosis of fast ion transport under the effects of the radial electric field [SG4]

58 2898 Yutaka Fujiwara

Experimental investigation targeting maximum alpha particle emission rate in p-11B fusion reactions [SG4]

59 2963, 2964, 3028 Jacobo Varela Rodríguez

Improved heating scenarios by enhancing ICRH + NBI coupling [SG4]

Techniques to avoid or minimize core dense collapse events [SG1]

Systematic characteristics of mode structure of resistive interchange instability [SG1]

#14

Convener: M. Nishiura (SG4)

60 3010 Bing Liu

Characterization of p-11B reaction near 163keV and 675keV resonances via α0, α1, γ branching ratios in LHD [SG4]

61 2908, 2952 Masato Matsuoka

Phase-space transport of fast ions interacting with Alfven waves [SG4]

Interaction between fast ions and MHD bursts with n=0 [SG4]

62 3036 Seongbin Hong

Effect of Hydrogen-Helium Ion Composition on Sub-Alfvénic ICE via Precise Control of V_beam/V_A [SG4]

#15

Convener: H. Igami (SG4)

63 2925 Shinji Wakisaka

Observation of gamma-rays emitted by 6Li-hydrogen isotopes reactions for fast ion diagnostics [SG4]

64 2956 Kenichi Nagaoka

Demonstration of external control of energetic ion confinement with AEs and EP measurement [SG4]

65 3049 Kenji Ueda

Inspection of fast-ion profiles with parallel and perpendicular neutral beams by CTS [SG4]

#16

Convener: T. Kobayashi (SG2)

66 3047 Won-Ha Ko

The study of ion transport in LHD with high density for ITER operation [SG2]

67 2885, 2996 Eiichirou Kawamori

Diagnosis of electron entropy distribution in phase space of electron-scale turbulence via electron cyclotron emission spectra I, Verification experiment of reconstruction of electron velocity distribution function from ECE spectrum [SG2]

Diagnosis of electron entropy distribution in phase space of electron-scale turbulence via electron cyclotron emission spectra II, Turbulence experiment [SG2]

68 2983, 2984 Yuya Morishita

Remote Control of LHD Plasma Using the New Plasma Simulator [SG2]

Digital Twin-Based Advanced Control of LHD Plasma by ASTI [SG2]

69 3027 Sadayoshi Murakami

Demonstration of plasma parameter optimization by the data assimilation control system ASTI with plasma navigation [SG2]

70 3040 Haifeng LIU

Comparative study of neoclassical transport in LHD and CFQS [SG2]

#17

Convener: H. Nakano (SG3)

71 2975, 2976, 2981, 2935 Ryoma Yanai

Study of electron temperature fluctuation behaviour in e-ITB plasmas [SG2]

Comparison of turbulence characteristics in different EVDF conditions [SG2]

Turbulence characteristics in density-peaking plasma in LHD [SG2]

Confirmation of ECH alignment [SG3]

72 2927 Kizuku Ogihara

Density profile control by off-axis ECH in high density plasmas [SG3]

73 2936 Naoto Tsujii

Optimization of ICRF heating scenarios to control energetic ion distribution function in phase space [SG3]

74 3019 Nozomu Shirokoshi

Comparative Study and Validation of ECH Ray-Tracing Code Models [SG3]

75 2921, 2922, 2994 Ryosuke SEKI

Commissioning of ICRF experiment [SG3]

Heating efficiency and fast ion tail formation of ICRF second proton heating [SG3]

Dependence of resonance layer shape and antenna on heating efficiency of minority ion heating [SG3]

#18

Convener: R. Seki (SG3)

76 2854 Shin Kubo

Characteristics of millimeter wave vortex on heating, current drive, and propagation in high-density plasmas [SG3]

77 2894 Worathat Paenthong

Investigation of Changes in Helically-Trapped Energetic-Particle Distribution Induced by Energetic-Ion-Driven Resistive Interchange Mode Using an Imaging Neutral Particle Analyzer in the Large Helical Device [SG4]

78 2991 Vaishnavi Murugesan

ECRH Power deposition studies using calibrated ECE at LHD [SG3]

79 2874, 2875 Yurii Kovtun

ICRF plasma production and heating in the hydrogen minority regime [SG3]

Scenarios of plasma start-up at second harmonic ICRF [SG3]

80 3011 Marcin Jakubowski

Development of steady-state detachment scenarios at LHD [SG2]

81 2938 Tomasz Fornal

Investigation of tungsten (W) and gold (Au) behavior injected via the TESPEL system into the NBI-heated hydrogen LHD plasma: effects on plasma density and temperature observed by VUV spectroscopy [SG2]

82 2953 Łukasz Syrocki

Effect of the quantity of tungsten (W) and gold (Au) injected by the TESPEL system into the ECRH-heated hydrogen LHD plasma on VUV spectra under different LHD plasma conditions [SG2]

#19

Convener: H. Takahashi (SG3)

83 2966, 2967, 2968, 2969, 2970, 2971, 2972 Naoki Tamura

Impurity effect on turbulent transport in magnetically-confined toroidal plasmas [SG2]

Assessment of geometrical effect on transport through quadrupole field scan [SG2]

Confinement and transport studies in helium plasmas [SG2]

Reference discharges in every magnetic configuration through the last LHD experiment campaign [SG2]

Optimization of a pellet fueling by combining various fueling methods [SG2]

Effect of mixed-ion plasma on impurity transport in NBI-heated plasmas at Rax = 3.55 m [SG2]

Study of core impurity transport in LHD plasmas with Rax = 3.53 m and 3.9 m [SG2]

Thu, July 3

#20

Convener: M. Shoji (SG5)

84 2965 Alessandro Bortolon

Effect of low-Z powders on tungsten transport [SG5]

85 2918 Robert Lunsford

Conclusion of lithium granule injection series for plasma modification and supplemental wall conditioning [SG5]

86 3034 Shota Abe

Diamond and diamond-like carbon as advanced divertor plasma-facing components [SG5]

87 2868 Masahiro Kobayashi

Optimization of impurity radiation with edge magnetic structure, heating scheme, and impurity species [SG5]

#21

Convener: G. Motojima (SG5)

88 3039, 3043, 3044 Kiyofumi Mukai

Anomaly detection of radiation profile in radiative collapse [SG5]

Control of impurity seeding using ECE signal for divertor detachment [SG5]

Relation between toroidal asymmetry of divertor detachment and radiation localization [SG5]

89 2900, 2901, 2902 Mamoru Shoji

The sustainment of divertor detachment by impurity dust particle injection into the magnetic island in the LHD peripheral plasma using the IPD [SG5]

The evaluation of the toroidal uniformity of the boron deposition on the divertor plates for effective real-time boronization using the impurity powder dropper (a low plasma density condition) [SG5]

The evaluation of the toroidal uniformity of the boron deposition on the divertor plates for effective real-time boronization using the impurity powder dropper (a high plasma density condition) [SG5]

90 2962 Hiroki Natsume

BRDF Measurement of Boron-Coated Tungsten for Accurate Optical Diagnostics [SG5]

#22

Convener: M. Kobayashi (SG5)

91 3016 Mingzhong Zhao

Effect of pre-damage on hydrogen/helium mixed plasma induced tungsten surface modifications at divertor [SG5]

92 3038, 3046, 3048, 3060 Suguru MASUZAKI

Investigation of the effects of impurity powder dropping on the transport of the first wall material in LHD [SG5]

Sustainment of divertor detachment by using feedback control impurity seeding [SG5]

Effects of boronizatoin on plasma facing surface [SG5]

Super-long pulse discharge with integrated operation - IPD, impurity seeding, RMP - [SG5]

93 3037 Yukinori Hamaji

Liquid metal divertor experiment [SG5]

#23

Convener: R. T. Ishikawa (SG6)

94 2985 Arseniy Kuzmin

Spatial Behavior of BH Rotational Temperatures and Surface Processes in Boron-Conditioned Plasmas [SG6]

95 2920 Chihiro Suzuki

Experimental identification of spectral lines from highly charged heavy ions [SG6]

96 2940 Daiji Kato

Heavy element atomic data toward decoding infrared spectra of neutron star mergers [SG6]

97 2604 Fumihiro Koike

Study of trans atomic number systematics of EUV spectra of heavy-atomic multiply-charged ions [SG6]

98 3032 Hirohisa Hara

Validation of EUV spectroscopic diagnostic method for solar high-temperature plasma by utilizing the LHD experimental dataset [SG6]

99 2892 Hiroyuki Takahashi

Establishing a diagnostic technique for concentration of impurity nitrogen ion using collisional-radiative analysis combined with divertor spectroscopy [SG6]

#24

Convener: C. Suzuki (SG6)

100 3017 Izumi Murakami

Simultaneous multi-wavelength spectroscopies for validation on atomic data and spectroscopic modeling for highly charged ions [SG6]

101 3006 Kunpei Nojiri

Survey of boron spectral lines and its application to ITER divertor plasma diagnostics [SG6]

102 3058, 3059 Motoshi Goto

Doppler free spectroscopy for the neutral penetration profile measurement [SG6]

Tomographic analysis of helium atom emission line intensity [SG6]

103 3012 Ryota Nishimura

Exploration of line emissions from tungsten ions in low charge states and the application to the study of impurity transport in the edge plasmas [SG6]

104 2982 Taiichi Shikama

Polarization imaging of Ar XIV and H_alpha emission lines for diagnosing anisotropic electron velocity distributions [SG6]

#25

Convener: M. Goto (SG6)

105 3042 Edgardo Villalobos Granados

Spectroscopic characterization of pellet ablation for investigating plasmoid dynamics in stellarators [SG6]

106 2989 Ivan Traparic

Investigation of tungsten impurity confinement time in presence of additional ECH heating with spatially resolved EUV spectroscopy [SG6]

107 3054 Nerea Panadero

Effect of magnetic configuration on pellet fuelling efficiency [SG6]

#26

Convener: M. Kobayashi (SG5)

108 2910 Chandra Prakash Dhard

Exposure of material samples into the LHD edge plasma by means of the manipulator [SG5]

109 2884 Erhui Wang

Investigation of edge impurity transport in detached high-beta plasma with inward-shifted configuration [SG5]

110 2957 Masato Kobayashi

Hysteresis conditions in thermal instability with various impurities, densities, and magnetic islands, and their universality across fusion plasma and astrophysical plasma [SG5]

111 2973, 2974 Uwe Wenzel

Search of the trigger of the ultra-high divertor pressure regime [SG5]

Dependence of the ultra-high pressure regime on the field configuration [SG5]

112 Closing